OpenSSH 10.5 Released

OpenSSH 10.5 was released on 2026-08-11, featuring security fixes and new features, including a fix for an ssh-agent interaction that could allow remote operations when the agent was locked. The OpenSSH team announced they will make more frequent releases due to a large number of security bug reports, many from AI models, and noted that some bugs found by AI are later independently discovered by other researchers.

OpenSSH 10.5 was released on 2026-08-11. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Recently the OpenSSH team have received a large number of security bug reports, many of which are findings from AI models or made with AI assistance. While many AI reports are determined not to have security impact when considered in the context of a realistic threat model, we very much welcome these reports, especially when combined with human triage, analysis, test-cases and particularly when accompanied by proposed fixes. We have seen a number of cases where a security bug identified by AI tools is subsequently independently discovered by a different researcher. This suggests that adversaries who do not report bugs to OSS projects are likely to be able to discover these bugs too. Given this, the OpenSSH team will, for now, be making more frequent releases to get bugfixes into users' hands more quickly rather than batching them until the next planned release. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Potentially-incompatible changes -------------------------------- Portable OpenSSH now requires ECC Elliptic Curve Cryptography support in libcrypto, including support for the NISTP521 curve. ECC is included in the default build configurations of all versions of all libcrypto implementations currently supported by OpenSSH, including LibreSSL, OpenSSL, BoringSSL and AWS LC. The --without-openssl build configuration is not affected. Changes since OpenSSH 10.4 ========================== This release contains a number of security fixes and small bugfixes. Security ======== ssh-agent 1 : fix an interaction between agent locking and the session-bind@openssh.com extension that is used to identify forwarded agents. These binding requests were refused when the agent was locked, with the result that operations that were intended to be limited to local use only could be performed remotely, including the ability to add PKCS 11 tokens and make use of keys that had destination restrictions applied. Reported by sn0x-sharma ssh 1 : avoid potential realloc use-after-free in the client if a remote forwarding is added via the local session multiplexing socket while a remote forwarding open request is pending with the server. Report and fix from Brian Mingus of Cognatory sshd 8 : make the authorized keys "restrict" keyword apply correctly to tunnel forwarding too which is administratively disabled by default . Reported by Erichen, Institute of Computing Technology, Chinese Academy of Sciences New features ------------ ssh-keygen 1 : add ability to set or clear the touch-required and verify-required flags on FIDO private keys when resetting a private key's passphrase. ssh 1 : tweak ordering of certificates tried during pubkey authentication to prefer FIDO keys that do not require user presence touch first, and FIDO keys that require user verification via PIN or biometrics last. This effectively tries low-friction authenticators before higher friction ones. ssh 1 : add a "ssh -Z user@host" mode that prints the keys that will be tried for public key authentication in the order that they will be used. sshd 8 use setproctitle 3 to identify sshd-session when its acting as a post-authentication monitor. Bugfixes -------- ssh-keyscan 1 : make reading the server banner a non-blocking operation to prevent a stuck server from blocking a many-host keyscan from proceeding. sshd 8 : use sshpkt fatal instead of plain fatal for errors in the packet code as this provides context of the failing peer address, port, user, etc . sshd 8 : when signing hostkey proofs for a client UpdateHostKeys request, allow each hostkey to perform at most one signature operation. sshd 8 fix GSSAPI option names, that were broken during a servconf.c refactoring in openssh-10.4; bz3974. ssh-keygen 1 : pass back errors from ed25519 key generation, which theoretically can fail. GHPR702. sshd 8 : move check of public key type against allowed algorithms to before parsing of the key sent by the peer. This removes at least some key parsing and verification paths from the pre-auth attack surface. Suggested by Christopher Paul Rohlf of Anthropic. ssh-keygen 1 : fix double frees impossible to reach outside of a test harness , and also use freezero where possible. From Christopher Paul Rohlf at Anthropic. sshd 8 : fix ChannelTimeout and RekeyLimit not being applied in sshd config Match blocks. sshd 8 : in sshd config dump mode, write all directives in mixed case for consistency Portability ----------- sshd 8 : re-allow PAMServiceName inside a Match block, which was incorrectly disabled during a refactoring in openssh-10.4. bz3987 Checksums: ========== - SHA1 openssh-10.5.tar.gz = 273163972f623bb9bffef9fd75a85c74d3b22633 - SHA256 openssh-10.5.tar.gz = 9Zhp0C/mDWNLmnatq68mtbqOUhvbyYcffH04dsHUwZQ= - SHA1 openssh-10.5p1.tar.gz = 3067e2af7c526b31c7e94bc3ed38904ef791eb2c - SHA256 openssh-10.5p1.tar.gz = 1E0oqDnqna+WnMaRUP3lmRCys5Nh2tgaO9bL0ZIY2xE= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 10.4 was released on 2026-07-06. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Potentially-incompatible changes -------------------------------- sshd 8 : configuration dump mode "sshd -G" now writes directives in mixed case e.g. "PubkeyAuthentication" whereas previously it emitted only lower-case names. sshd 8 : on Linux systems with the seccomp sandbox enabled, failures to enable SECCOMP or NO NEW PRIVS are now fatal. Previously sshd 8 would log the error but continue operation, to support systems that lacked these features. Now systems that lack these should instead disable the sandbox at configure time. ssh 1 , sshd 8 : make the transport protocol stricter by disconnecting if the peer sends non-KEX messages during a post- authentication key re-exchange. Previously a malicious peer could continue sending non-key exchange messages without penalty. These would be buffered, causing memory to be wasted up until the connection terminated or the server/client hit a memory limit. Implementations that do not restrict messages sent during key exchange as per RFC4253 section 7.1 may be disconnected. Reported by Marko Jevtic. Changes since OpenSSH 10.3 ========================== This release contains a number of security fixes as well as general bugfixes and a couple of new features. Security ======== sftp 1 : when downloading files on the command-line using "sftp host:/path .", a malicious server could cause the file to be downloaded to an unexpected location. This issue was identified by the Swival Security Scanner. scp 1 : when copying files between two remote destinations, do not allow a malicious server to write files to the parent directory of the intended target directory. This issue was identified by the Swival Security Scanner. sshd 8 : when using the "internal-sftp" SFTP server implementation this is not the default , long command lines were previously truncated silently after the 9th argument. If a security-relevant option was in the 10th or later position, it would be discarded. Reported by Steve Caffrey. sshd 8 : add a documentation note to mention that the GSSAPIStrictAcceptorCheck option is ineffective when the server is joined to a Windows Active Directory. Reported by Yarin Aharoni of Safebreach. sshd 8 : DisableForwarding=yes didn't override PermitTunnel=yes as it was documented to do. Note that PermitTunnel is not enabled by default. Reported independently by Huzaifa Sidhpurwala of Redhat and Marko Jevtic. sshd 8 : avoid a potential pre-authentication denial of service when GSSAPIAuthentication was enabled this feature is off by default . This was not mitigated by MaxAuthTries, but would be penalised by PerSourcePenalties. This was reported by Manfred Kaiser of the milCERT AT Austrian Ministry of Defence . sshd 8 : fix a number of cases where the minimum authentication delay was not being enforced. Reported by the Orange Cyberdefense Vulnerability Team. ssh 1 : fix a possible client-side use-after-free if the server changes its host key during a key reexchange. This was reported by Zhenpeng Leo Lin of Depthfirst. New features ------------ All: add experimental support for a composite post-quantum signature scheme that combines ML-DSA 44 and Ed25519 as specified in draft-miller-sshm-mldsa44-ed25519-composite-sigs. This scheme is not enabled by default. To use it, you'll need to add it to HostKeyAlgorithms, PubkeyAcceptedAlgorithms, etc. Keys may be generated using "ssh-keygen -t mldsa44-ed25519". ssh 1 , sshd 8 : replace the wildcard pattern matcher with an implementation based on an NFA. This avoids exponential worst-case behaviour for the old implementation. Bugfixes -------- ssh-agent 1 : fix incorrect reply to "query" SSH AGENTC EXTENSION requests. bz3967 sshd 8 : avoid sending observably different messages for valid vs invalid users in GSSAPIAuthentication disabled by default . ssh 1 , sshd 8 : fix several bugs that incorrectly classified bulk traffic as interactive. bz3972, bz3958 ssh-keygen 1 , ssh-add 1 : skip unsupported key types when downloading resident keys from a FIDO token. Previously, downloads would abort when one was encountered. GHPR657 ssh 1 : fix a potential use-after-free on an error path if cipher init fails. sshd 8 : perform stricter encoding and validation of transport state passed between sshd privilege separation subprocesses. This somewhat further hardens the server against attacks on sshd-auth or sshd-session subprocesses. ssh-agent 1 : avoid possible runtime denial of service by enforcing some limits on the length of usernames in key use constraints. sftp 1 : fix two separate one-byte out-of-bounds reads, in SSH2 FXP REALPATH and batch command processing. sftp-server 8 : disallow use of the copy-data extension to read and write to the same inode simultaneously. ssh 1 , sshd 8 : avoid strlen NULL crash if an X11 channel was created before the x11-req SSH MSG CHANNEL REQUEST was sent. GHPR679 sftp 1 , scp 1 : avoid a situation where sftp download could get stuck in a loop if a broken server repeatedly returned zero length while reading a file. ssh 1 : avoid leaking DNS0x20 case-randomised names into names canonicalised using CanonicalizePermittedCNAMEs. bz3966 sftp-server 8 : avoid truncation of pathnames passed to lstat during SSH FXP REALPATH handling on systems where PATH MAX is not the actual max. GHPR688 ssh 1 , sshd 8 : correct arming of poll 2 event masks for some socket-type channels. GHPR660 sshd 8 : major refactor of sshd config parsing and management code, to allow for more exact serialisation/deserialisation across privilege separation boundaries. ssh-add 1 : open connection to the agent only after getopt processing has completed, to give options like "-v" a chance to display debug information about this operation. crypto code: fix bounds checking when signing messages of length greater than will fit in a size t. In OpenSSH, message sizes are bounded by SSHBUF SIZE MAX so this was unreachable. crypto code: add signature malleability and pubkey validity checks to ed25519 verification. SSH doesn't depend on these properties crypto code: fix ECDSA order check for curves with cofactor = 1. All supported EC curves have cofactor 1, so this was unreachable. sshd 8 : differentiate between execution failures and a subsystem that was not found when logging why a subsystem failed to start. GHPR637 All: use safer idioms for timegm 3 and mktime 3 error detection. ssh 1 , sshd 8 : avoid accepting invalid cipher or MAC lists in config files or command-line arguments. This could cause runtime failures later. ssh 1 : fix NULL deref crash during pubkey auth when using a PEM style private key with no corresponding .pub key adjacent to it. sshd 8 : don't print an error message when trying to load a host private key when PKCS 11 keys are in use, as these don't need the private half on the filesystem. GHPR664 All: don't use deprecated ERR load crypto strings . GHPR650 ssh 1 : properly report errors during configuration default setting. GHPR649 ssh 1 : use correct directive name Match instead of Host in error message. bz3968 sftp 1 : fix "ls -ln" which was not correctly showing numeric UID/GIDs but rather user and group names. bz3953 sshd 8 : avoid possible NULL dereference if an allocation fails during config parsing. bz3948 All: fix ineffective guards against loading overly large public keys in several places. bz3969 and bz3970 sftp 1 : ensure file descriptors used by sftp to communicate to its ssh 1 subprocess don't leak into executed subprocesses e.g. via " " . GHPR693 Portability ----------- Sync fmt scaled.c with OpenBSD upstream, picking up an exactness fix for large exponents GHPR671 sshd 8 : remove duplicate sandbox entry for clock gettime64. ssh 1 , sshd 8 : use correct IPTOS DSCP VA value if not provided by the system headers. Sync getrrsetbyname.c with OpenBSD upstream, picking up robustness fixes. Disable replacements in openbsd-compat for strvisx 3 and stravis 3 , as these are unused in OpenSSH Avoid fortify warnings on Android bz3954 Fix a number of memory leaks on error paths in the portability code. GHPR681 Revise the README.privsep documentation to reflect sshd's recent switch to a multi-binary model. Checksums: ========== - SHA1 openssh-10.4.tar.gz = 8502b516230865e229d55045bb4ccc67aeae905b - SHA256 openssh-10.4.tar.gz = qUVI+wMg4mVpiQbXvfMVkF3Zuyy2JrS+ZjN764mtyGE= - SHA1 openssh-10.4p1.tar.gz = ae8650a71cc52dbbd049519cee276ae6d65c2c4d - SHA256 openssh-10.4p1.tar.gz = 72Am3SrqjVYFljjV0yYpAsiSzrqfiDlYNeDQbT+2Mjg= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 10.3 was released on 2026-04-02. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Potentially-incompatible changes -------------------------------- ssh 1 , sshd 8 : remove bug compatibility for implementations that don't support rekeying. If such an implementation tries to interoperate with OpenSSH, it will now eventually fail when the transport needs rekeying. sshd 8 : prior to this release, a certificate that had an empty principals section would be treated as matching any principal i.e. as a wildcard when used via authorized keys principals="" option. This was intentional, but created a surprising and potentially risky situation if a CA accidentally issued a certificate with an empty principals section: instead of being useless as one might expect, it could be used to authenticate as any user who trusted the CA via authorized keys. Note that this condition did not apply to CAs trusted via the sshd config 5 TrustedUserCAKeys option. This release treats an empty principals section as never matching any principal, and also fixes interpretation of wildcard characters in certificate principals. Now they are consistently implemented for host certificates and not supported for user certificates. ssh 1 : the -J and equivalent -oProxyJump="..." options now validate user and host names for ProxyJump/-J options passed via the command-line no such validation is performed for this option in configuration files . This prevents shell injection in situations where these were directly exposed to adversarial input, which would have been a terrible idea to begin with. Reported by rabbit. Changes since OpenSSH 10.2 ========================== This release contains some relatively minor security fixes as well as a number of feature improvements and general bugfixes. Security ======== ssh 1 : validation of shell metacharacters in user names supplied on the command-line was performed too late to prevent some situations where they could be expanded from %-tokens in ssh config. For certain configurations, such as those that use a "%u" token in a "Match exec" block, an attacker who can control the user name passed to ssh 1 could potentially execute arbitrary shell commands. Reported by Florian Kohnhäuser. We continue to recommend against directly exposing ssh 1 and other tools' command-lines to untrusted input. Mitigations such as this can not be absolute given the variety of shells and user configurations in use. sshd 8 : when matching an authorized keys principals="" option against a list of principals in a certificate, an incorrect algorithm was used that could allow inappropriate matching in cases where a principal name in the certificate contains a comma character. Exploitation of the condition requires an authorized keys principals="" option that lists more than one principal and a CA that will issue a certificate that encodes more than one of these principal names separated by a comma typical CAs strongly constrain which principal names they will place in a certificate . This condition only applies to user- trusted CA keys in authorized keys, the main certificate authentication path TrustedUserCAKeys/AuthorizedPrincipalsFile is not affected. Reported by Vladimir Tokarev. scp 1 : when downloading files as root in legacy -O mode and without the -p preserve modes flag set, scp did not clear setuid/setgid bits from downloaded files as one might typically expect. This bug dates back to the original Berkeley rcp program. Reported by Christos Papakonstantinou of Cantina and Spearbit. sshd 8 : fix incomplete application of PubkeyAcceptedAlgorithms and HostbasedAcceptedAlgorithms with regard to ECDSA keys. Previously if one of these directives contains any ECDSA algorithm name say "ecdsa-sha2-nistp384" , then any other ECDSA algorithm would be accepted in its place regardless of whether it was listed or not. Reported by Christos Papakonstantinou of Cantina and Spearbit. ssh 1 : connection multiplexing confirmation requested using "ControlMaster ask/autoask" was not being tested for proxy mode multiplexing sessions i.e. "ssh -O proxy ..." . Reported by Michalis Vasileiadis. New features ------------ ssh 1 , sshd 8 : support IANA-assigned codepoints for SSH agent forwarding, as per draft-ietf-sshm-ssh-agent. Support for the new names is advertised via the EXT INFO message. If a server offers support for the new names, then they are used preferentially. Support for the pre-standardisation "@openssh.com" extensions for agent forwarding remains supported. ssh-agent 1 : implement support for draft-ietf-sshm-ssh-agent "query" extension. ssh-add 1 : support querying the protocol extensions via the agent "query" extension with a new -Q flag. ssh 1 : support multiple files in a ssh config RevokedHostKeys directive. bz3918 sshd 8 : support multiple files in a sshd config RevokedKeys directive bz3918 ssh 1 : add a ~I escape option that shows information about the current SSH connection. ssh 1 : add an "ssh -Oconninfo user@host" multiplexing command that shows connection information, similar to the ~I escapechar. ssh 1 : add an "ssh -O channels user@host" multiplexing command to get a running mux process to show information about what channels are currently open. sshd 8 : add 'invaliduser' penalty to PerSourcePenalties, which is applied to login attempts for usernames that do not match real accounts. Defaults to 5s to match 'authfail' but allows administrators to block such attempts for longer if desired. sshd 8 : add a GSSAPIDelegateCredentials option for the server, controlling whether it accepts delegated credentials offered by the client. This option mirrors the same option in ssh config. GHPR614 ssh 1 , sshd 8 : support the VA DSCP codepoint in the IPQoS directive. sshd 8 : convert PerSourcePenalties to using floating point time, allowing penalties to be less than a second. This is useful if you need to penalise things you expect to occur at =1 QPS. ssh-keygen 1 : support writing ED25519 keys in PKCS8 format. GHPR570 Support the ed25519 signature scheme via libcrypto. Bugfixes -------- sshd 8 : make IPQoS first-match-wins in sshd config, like other configuration directives. bz3924 sshd 8 : fix potential crash when MaxStartups is using a single argument i.e. not using the MaxStartps x:y:z form to a value below 10. bz3941 sshd 8 : fix a potential hang during key exchange if needed DH group values were missing from /etc/moduli. ssh-agent 1 : fix return values from extensions to be correct wrt draft-ietf-sshm-ssh-agent: extension requests should indicate failure using SSH AGENT EXTENSION FAILURE rather than the generic SSH AGENT FAILURE error code. This allows the client to discern between "the request failed" and "the agent doesn't support this extension". ssh 1 : use fmprintf for showing challenge-response name and info to preserve UTF-8 characters where appropriate. Prompted by GitHub PR 452. scp 1 : when uploading a directory using sftp/sftp e.g. during a recursive transfer , don't clobber the remote directory permissions unless either we created the directory during the transfer or the -p flag was set. bz3925 All: implement missing pieces of FIDO/webauthn signature support, mostly related to certificate handling and enable acceptance of this signature format by default. bz3748 GHPR624 GHPR625 sshd config 5 : make it clear that DenyUsers/DenyGroups overrides AllowUsers/AllowGroups. Previously we specified the order in which the directives are processed but it was ambiguous as to what happened if both matched. ssh 1 : don't try to match certificates held in an agent to private keys. This matching is done to support certificates that were loaded without their private key material, but is unnecessary for agent-hosted certificate which always have private key material available in the agent. Worse, this matching would mess up the request sent to the agent in such a way as to break usage of these keys when the key usage was restricted in the agent. bz3752 sftp 1 : if editline has been switched to vi mode i.e. via "bind -v" in .editrc , setup a keybinding so that command mode can be entered. ssh 1 , sshd 8 : improve performance of keying the sntrup761 key agreement algorithm. ssh 1 , sshd 8 : enforce maximum packet/block limit during pre-authentication phase. sftp 1 : don't misuse the sftp limits extension's open-handles field. This value is supposed to be the number of handles a server will allow to be opened and not a number of outstanding read/write requests that can be sent during an upload/download. sshd 8 : don't crash at connection time if the main sshd config lacks any subsystem directive but one is defined in a Match block. bz3906 sshd config 5 : add a warning next to the ForceCommand directive that forcing a command doesn't automatically disable forwarding. sshd config 5 : add a warning that TOKENS are replaced without filtering or escaping and that it's the administrator's responsibility to ensure they are used safely in context. scp 1 : correctly quote filenames in verbose output for local- local copies. bz3900 sshd 8 : don't mess up the PerSourceNetBlockSize IPv6 mask if sscanf didn't decode it. GHPR598 ssh-add 1 : when loading FIDO2 resident keys, set the comment to the FIDO application string. This matches the behaviour of ssh-keygen -K. GHPR608 sshd 8 : don't strnvis log messages that are going to be logged by sshd-auth via its parent sshd-session process, as the parent will also run them though strnvis . Prevents double-escaping of non-printing characters in some log messages. bz3896 ssh-agent 1 : escape SSH AUTH SOCK paths that are sent to the shell as setenv commands. Unbreaks ssh-agent for home directory paths that contain whitespace. bz3884 All: Remove unnecessary checks for ECDSA public key validity. sshd 8 : activate UnusedConnectionTimeout only after the last channel has closed. Previously UnusedConnectionTimeout could fire early after a ChannelTimeout. This was not a problem for the OpenSSH client because it terminates once all channels have closed but could cause problems for other clients e.g. API clients that do things differently. bz3827 All: fix PKCS 11 key PIN entry problems introduced in openssh-10.1/10.2. bz3879 scp 1 : when using the SFTP protocol for transfers, fix implicit destination path selection when source path ends with "..". bz3871 sftp 1 : when tab-completing a filename, ensure that the completed string does not end up mid-way through a multibyte character, as this will cause a fatal later on. GHPR 587 ssh-keygen 1 : fix crash at exit visible via ssh-keygen -D when multiple keys loaded. scp 1 /sftp 1 : correctly display bandwidths 2GBps in the progress meter. Portability ----------- sshd 8 : fix condition introduced in openssh 10.2p1 stable branch here a PAM module that changed the requested username between SSH MSG USERAUTH REQUEST messages during authentication could confuse the PAM stack and let it proceed with a different understanding of the active username than the rest of sshd. Reported by Mike Damm. sshd 8 : immediately report interactive instructions to clients when using keyboard-interactive authentication with PAM. bz2876 sshd 8 : fix duplicate PAM messages under some situations. sshd 8 : don't leak PAM handle on repeat invocations. bz3882 All: support linking libcrypto implementations e.g. BoringSSL that require libstdc++. sshd 8 : fix ut type for btmp records, correctly using LOGIN PROCESS and USER PROCESS. sshd 8 : allow uname 3 in the seccomp sandbox. This is needed by zlib-ng on RISC-V platforms. All: remove remaining OpenSSL add all algorithms calls. We already have OPENSSL init crypto in the compat layer. Prompted by github PR 606 All: fix builds on older Mac OS wrt nfds t. mdoc2man: several improvements including better support for Dl and Ns inside Ic. Checksums: ========== - SHA1 openssh-10.3.tar.gz = 854863c04cd28242d73ac6c3ee9c37fa756f1a2f - SHA256 openssh-10.3.tar.gz = aCU5P47rM+m4N8/i2JOHMOMhafMYqBhvQQSnPXczN5M= - SHA1 openssh-10.3p1.tar.gz = 9c78838ec07af14aff54f3755ac56ce6812452a9 - SHA256 openssh-10.3p1.tar.gz = VmgqNruS3PS08Bb9jsjnQFm3mo3iXBXWcNcx59GORfQ= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 10.2 was released on 2025-10-10. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation warning -------------------------- A future release of OpenSSH will deprecate support for SHA1 SSHFP records due to weaknesses in the SHA1 hash function. SHA1 SSHFP DNS records will be ignored and ssh-keygen -r will generate only SHA256 SSHFP records. The SHA256 hash algorithm, which has no known weaknesses, has been supported for SSHFP records since OpenSSH 6.1, released in 2012. Changes since OpenSSH 10.1 ========================== This is a bugfix release, primarily to fix a problem that rendered ssh 1 unusable when ControlPersist was enabled. Bugfixes -------- ssh 1 : fix mishandling of terminal connections when ControlPersist was active that rendered the session unusable. bz3872 ssh-keygen 1 : fix download of keys from PKCS 11 tokens. ssh-keygen 1 : fix CA signing operations when the CA key is held in a ssh-agent 1 . bz3877 Portability ----------- All: support platforms without mmap 2 , e.g. WASM builds such as https://hterm.org All: fix builds on FreeBSD for missing fnctl.h include. All: fix builds on MacOS <10.12 Sierra, which lacks clock gettime 3 sshd 8 : don't PAM RHOST if the remote host is the "UNKNOWN" placeholder name. Avoids potential hangs in some PAM modules as they try to resolve it. Note, sshd 8 only uses the "UNKNOWN" name when the connection is not on an IPv4 or IPv6 socket. Checksums: ========== SHA1 openssh-10.2.tar.gz = 6fcda8004bad0fb0eaee60e8308f91b605ad0dce SHA256 openssh-10.2.tar.gz = y0rCEdrVc4OJRZLg0u3F0frAgz87ydeTktCk3rQfVj8= SHA1 openssh-10.2p1.tar.gz = c34efade16109f065ec8c834f237bcedd8d7ef5c SHA256 openssh-10.2p1.tar.gz = zMQsBBmTeVkmP6Hb0W2vwYxWuYTANWLSk3zlamD3mLI= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 10.1 was released on 2025-10-06. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation warning -------------------------- A future release of OpenSSH will deprecate support for SHA1 SSHFP records due to weaknesses in the SHA1 hash function. SHA1 SSHFP DNS records will be ignored and ssh-keygen -r will generate only SHA256 SSHFP records. The SHA256 hash algorithm, which has no known weaknesses, has been supported for SSHFP records since OpenSSH 6.1, released in 2012. Potentially-incompatible changes -------------------------------- ssh 1 : add a warning when the connection negotiates a non-post quantum key agreement algorithm. This warning has been added due to the risk of "store now, decrypt later" attacks. More details at https://openssh.com/pq.html This warning may be controlled via a new WarnWeakCrypto ssh config option, defaulting to on. This option is likely to control additional weak crypto warnings in the future. ssh 1 , sshd 8 : major changes to handling of DSCP marking/IPQoS In both client and server the default DSCP a.k.a IPQoS values were revised and the way these values are used during runtime has changed. Interactive traffic is now assigned to the EF Expedited Forwarding class by default. This provides more appropriate packet prioritisation information for the intermediate network, such as wireless media cf. RFC 8325 . Non-interactive traffic will now use the operating system default DSCP marking. Both the interactive and non-interactive DSCP values may be overridden via the IPQoS keyword, described in ssh config 5 and sshd config 5 . The appropriate DSCP marking is now automatically selected and updated as needed over the course of a connection's lifetime. ssh 1 and sshd 8 will switch between the interactive and non-interactive IPQoS values depending on the type of SSH channels open at the time. For example, if an sftp session is using the connection alongside a shell session, then the non- interactive value will be used for the duration of the sftp. A connection which contains only interactive sessions is marked EF. ssh 1 , sshd 8 : deprecate support for IPv4 type-of-service ToS keywords in the IPQoS configuration directive. Type of Service ToS was deprecated in the late nineties and replaced with the Differentiated Services architecture, which has significant advantages for operators because it offers more granularity. OpenSSH switched its default IPQoS from ToS to DSCP values in 2018 openssh-7.7 . IPQoS configurations with 'lowdelay', 'reliability', or 'throughput' will be ignored and will instead use the system default QoS settings. Additionally, a debug message will be logged about the deprecation with a suggestion to use DSCP QoS instead. ssh-add 1 : when adding certificates to an agent, set the expiry to the certificate expiry time plus a short 5 min grace period. This will cause the agent to automatically remove certificates shortly after they expire. A new ssh-add -N option disables this behaviour. All: remove experimental support for XMSS keys. This was never enabled by default. We expect to implement a new post-quantum signature scheme in the near future. ssh-agent 1 , sshd 8 : move agent listener sockets from /tmp to under ~/.ssh/agent for both ssh-agent 1 and forwarded sockets in sshd 8 . This ensures processes that have restricted filesystem access that includes /tmp do not ambiently have the ability to use keys in an agent. Moving the default directory has the consequence that the OS will no longer clean up stale agent sockets, so ssh-agent now gains this ability. To support $HOME on NFS, the socket path includes a truncated hash of the hostname. ssh-agent will, by default, only clean up sockets from the same hostname. ssh-agent 1 gains some new flags: -U suppresses the automatic cleanup of stale sockets when it starts. -u forces a cleanup without keeping a running agent, -uu forces a cleanup that ignores the hostname. -T makes ssh-agent put the socket back in /tmp. Changes since OpenSSH 10.0 ========================== This release contains a minor security fix as well as a number of feature improvements and bugfixes. Security ======== ssh 1 : disallow control characters in usernames passed via the commandline or expanded using %-sequences from the configuration file, and disallow \0 characters in ssh:// URIs. If an ssh 1 commandline was constructed using usernames or URIs obtained from an untrusted source, and if a ProxyCommand that uses the %r expansion was configured, then it may be possible for an attacker to inject shell expressions that may be executed when the proxy command is started. We strongly recommend against using untrusted inputs to construct ssh 1 commandlines. This change also relaxes the validity checks in one small way: usernames supplied via the configuration file as literals i.e. that have no % expansion characters are not subject to these validity checks. This allows usernames that contain arbitrary characters to be used, but only via configuration files. This is done on the basis that ssh's configuration is trusted. This issue was reported by David Leadbeater. New features ------------ ssh 1 , sshd 8 : add SIGINFO handlers to log active channel and session information. sshd 8 : when refusing a certificate for user authentication, log enough information to identify the certificate in addition to the reason why it was being denied. Makes debugging certificate authorisation problems a bit easier. ssh 1 , ssh-agent 1 : support ed25519 keys hosted on PKCS 11 tokens. ssh 1 : add an ssh config 5 RefuseConnection option that, when encountered while processing an active section in a configuration, terminates ssh 1 with an error message that contains the argument to the option. This may be useful for expressing reminders or warnings in config files, for example: Match host foo RefuseConnection "foo is deprecated, use splork instead" sshd 8 : make the X11 display number check relative to X11DisplayOffset. This will allow people to use X11DisplayOffset to configure much higher port ranges if they really want, while not changing the default behaviour. unit tests: the unit test framework now includes some basic benchmarking capabilities. Run with "make UNITTEST BENCHMARK=yes" on OpenBSD or "make unit-bench" on Portable OpenSSH. Bugfixes -------- sshd 8 : fix mistracking of MaxStartups process exits in some situations. At worst, this could cause all MaxStartups slots to fill and sshd to refuse new connections. ssh 1 : fix delay on X client startup when ObscureKeystrokeTiming is enabled. bz 3820 sshd 8 : increase the maximum size of the supported configuration from 256KB to 4MB, which ought to be enough for anybody. Fail early and visibly when this limit is breached. bz3808 sftp 1 : during sftp uploads, avoid a condition where a failed write could be ignored if a subsequent write succeeded. This is unlikely but technically possible because sftp servers are allowed to reorder requests. sshd 8 : avoid a race condition when the sshd-auth process exits that could cause a spurious error message to be logged. sshd 8 : log at level INFO when PerSourcePenalties actually blocks access to a source address range. Previously this was logged at level VERBOSE, which hid enforcement actions under default config settings. sshd 8 : GssStrictAcceptor was missing from sshd -T output; fix sshd 8 : Make the MaxStartups and PerSourceNetBlockSize options first-match-wins as advertised. bz3859 ssh 1 : fix an incorrect return value check in the local forward cancellation path that would cause failed cancellations not to be logged. sshd 8 : make "Match final" not trigger a second parsing pass of ssh config unless hostname canonicalisation or a separate "Match final" does . bz3843 ssh 1 : better debug diagnostics when loading keys. Will now list key fingerprint and algorithm not just algorithm number as well as making it explicit which keys didn't load. All: fix a number of memory leaks found by LeakSanitizer, Coverity and manual inspection. sshd 8 : Output the current name for PermitRootLogin's "prohibit-password" in sshd -T instead of its deprecated alias "without-password". bz 3788 ssh 1 : make writing known hosts lines more atomic by writing the entire line in one operation and using unbuffered stdio. Usually writes to this file are serialised on the "Are you sure you want to continue connecting?" prompt, but if host key checking is disabled and connections were being made with high concurrency then interleaved writes might have been possible. Portability ----------- sshd 8 : check the username didn't change during the PAM transactions. PAM modules can change the user during their execution, but this is not supported by sshd 8 . If such a case was incorrectly configured by the system administrator, then sshd 8 could end up using a different username to the one authorised by PAM. sshd 8 : don't log audit messages with UNKNOWN hostname to avoid slow DNS lookups in the audit subsystem. All: when making a copy of struct passwd, ensure struct fields are non-NULL. Android libc can return NULL pw gecos, for example. All: Remove status bits from OpenSSL =3 version check. sshd 8 , ssh 1 : Use SSH TUN COMPAT AF on FreeBSD. Otherwise tun forwarding from other OSes fails as soon as the first IPv6 message is sent by the other side which is usually a Router Solicitation ICMPv6 message which is sent as soon as the interface is up . ssh 1 , ssh-agent 8 : check for nlist function presence before attempting to use it instead of relying on the presence of the nlist.h header. Mac OS X, for example, has the header but not the function in the 64bit libraries. All: fill in missing system header files. Create replacement header files inside openbsd-compat for common headers that are missing on a given platform. Usually these are just empty, but in some cases they'll include the equivalent file. This avoids having to wrap those includes in ' ifdef HAVE FOO H' and reduces the diff between Portable OpenSSH and OpenBSD. sshd 8 : handle futex time64 properly in seccomp sandbox Previously we only allowed NR futex, but some 32-bit systems apparently support NR futex time64. We had support for this in the sandbox, but because of a macro error only NR futex was allowlisted. Add contrib/gnome-ssh-askpass4 for GNOME 40+ using the GCR API. sshd 8 : let ga init fail gracefully if getgrouplist does. Apparently getgrouplist can fail on OSX when passed a non-existent group name. Other platforms seem to return a group list consisting of the numeric gid passed to the function. bz3848 ssh-agent 1 : exit 0 from SIGTERM under systemd socket-activation, preventing a graceful shutdown of an agent via systemd from incorrectly marking the service as "failed". build: wrap some autoconf macros in AC CACHE CHECK. This allows skipping/overriding the OSSH CHECK CFLAG COMPILE and OSSH CHECK CFLAG LINK macros used to discover supported compiler or linker flags. E.g. $ ./configure ossh cv cflag fzero call used regs used=no ... checking if cc supports compile flag -fzero-call-used-regs=used and linking succeeds... cached no Checksums: ========== SHA1 openssh-10.1.tar.gz = 8eef44a945a9a9a5a99213ab0d57e35b7ba60e75 SHA256 openssh-10.1.tar.gz = j9ymvhvdGMeAvh1oTI2YmOAwv7Ao70gbGPyPedgQsBU= SHA1 openssh-10.1p1.tar.gz = 7fd17b99d1beffb47cd380d64079e920bb0bd91f SHA256 openssh-10.1p1.tar.gz = ufx6K4JXlGem8vQ+SoHI4d/aYU3bT5slWq/XAgu/B1g= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 10.0 was released on 2025-04-09. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Potentially-incompatible changes -------------------------------- This release removes support for the weak DSA signature algorithm, completing the deprecation process that began in 2015 when DSA was disabled by default and repeatedly warned over the last 12 months. scp 1 , sftp 1 : pass "ControlMaster no" to ssh when invoked by scp & sftp. This disables implicit session creation by these tools when ControlMaster was set to yes/auto by configuration, which some users found surprising. This change will not prevent scp/sftp from using an existing multiplexing session if one had already been created. GHPR557 This release has the version number 10.0 and announces itself as "SSH-2.0-OpenSSH 10.0". Software that naively matches versions using patterns like "OpenSSH 1 " may be confused by this. sshd 8 : this release removes the code responsible for the user authentication phase of the protocol from the per- connection sshd-session binary to a new sshd-auth binary. Splitting this code into a separate binary ensures that the crucial pre-authentication attack surface has an entirely disjoint address space from the code used for the rest of the connection. It also yields a small runtime memory saving as the authentication code will be unloaded after the authentication phase completes. This change should be largely invisible to users, though some log messages may now come from "sshd-auth" instead of "sshd-session". Downstream distributors of OpenSSH will need to package the sshd-auth binary. sshd 8 : this release disables finite field a.k.a modp Diffie-Hellman key exchange in sshd by default. Specifically, this removes the "diffie-hellman-group " and "diffie-hellman-group-exchange- " methods from the default KEXAlgorithms list. The client is unchanged and continues to support these methods by default. Finite field Diffie Hellman is slow and computationally expensive for the same security level as Elliptic Curve DH or PQ key agreement while offering no redeeming advantages. ECDH has been specified for the SSH protocol for 15 years and some form of ECDH has been the default key exchange in OpenSSH for the last 14 years. sshd 8 : this release removes the implicit fallback to compiled- in groups for Diffie-Hellman Group Exchange KEX when the moduli file exists but does not contain moduli within the client- requested range. The fallback behaviour remains for the case where the moduli file does not exist at all. This allows administrators more explicit control over which DH groups will be selected, but can lead to connection failures if the moduli file is edited incorrectly. bz 2793 Changes since OpenSSH 9.9 ========================= This release contains a minor security fix as well as a number of feature improvements and bugfixes. Security ======== sshd 8 : fix the DisableForwarding directive, which was failing to disable X11 forwarding and agent forwarding as documented. X11 forwarding is disabled by default in the server and agent forwarding is off by default in the client. New features ------------ ssh 1 : the hybrid post-quantum algorithm mlkem768x25519-sha256 is now used by default for key agreement. This algorithm is considered to be safe against attack by quantum computers, is guaranteed to be no less strong than the popular curve25519-sha256 algorithm, has been standardised by NIST and is considerably faster than the previous default. ssh 1 : prefer AES-GCM to AES-CTR mode when selecting a cipher for the connection. The default cipher preference list is now Chacha20/Poly1305, AES-GCM 128/256 followed by AES-CTR 128/192/256 . ssh 1 : add %-token and environment variable expansion to the ssh config SetEnv directive. ssh 1 : allow %-token and environment variable expansion in the ssh config User directive, with the exception of %r and %C which would be self-referential. bz 3477 ssh 1 , sshd 8 : add "Match version" support to ssh config and sshd config. Allows matching on the local version of OpenSSH, e.g. "Match version OpenSSH 10. ". ssh 1 : add support for "Match sessiontype" to ssh config. Allows matching on the type of session initially requested, either "shell" for interactive sessions, "exec" for command execution sessions, "subsystem" for subsystem requests, such as sftp, or "none" for transport/forwarding-only sessions. ssh 1 : add support for "Match command ..." support to ssh config, allowing matching on the remote command as specified on the command-line. ssh 1 : allow 'Match tagged ""' and 'Match command ""' to match empty tag and command values respectively. sshd 8 : allow glob 3 patterns to be used in sshd config AuthorizedKeysFile and AuthorizedPrincipalsFile directives. bz2755 sshd 1 : support the VersionAddendum in the client, mirroring the option of the same name in the server; bz2745 ssh-agent 1 : the agent will now delete all loaded keys when signaled with SIGUSR1. This allows deletion of keys without having access to $SSH AUTH SOCK. Portable OpenSSH, ssh-agent 1 : support systemd-style socket activation in ssh-agent using the LISTEN PID/LISTEN FDS mechanism. Activated when these environment variables are set, the agent is started with the -d or -D option and no socket path is set. GHPR502 ssh-keygen 1 : support FIDO tokens that return no attestation data, e.g. recent WinHello. GHPR542 ssh-agent 1 : add a "-Owebsafe-allow=..." option to allow the default FIDO application ID allow-list to be overridden. Add a work-in-progress tool to verify FIDO attestation blobs that ssh-keygen can optionally write when enrolling FIDO keys. This tool is available under regress/misc/ssh-verify-attestation for experimentation but is not installed by "make install". ssh-keygen 1 : allow "-" as output file for moduli screening. GHPR393 Bugfixes -------- sshd 8 : remove assumption that the sshd config and any configs it includes can fit in a possibly enlarged socket buffer. Previously it was possible to create a sufficiently large configuration that could cause sshd to fail to accept any connection. sshd 8 will now actively manage sending its config to the sshd-session sub-process. ssh 1 : don't start the ObscureKeystrokeTiming mitigations if there has been traffic on a X11 forwarding channel recently. Should fix X11 forwarding performance problems when this setting is enabled. bz3655 ssh 1 : prohibit the comma character in hostnames accepted, but allow an underscore as the first character in a hostname. sftp 1 : set high-water when resuming a "put". Prevents bogus "server reordered acks" debug message. ssh 1 , sshd 8 : fix regression in openssh-9.8, which would fail to accept "Match criteria=argument" as well as the documented "Match criteria argument" syntax in ssh config and sshd config. bz3739 sftp 1 , ssh 1 : fix a number possible NULL dereference bugs, including Coverity CIDs 405019 and 477813. sshd 8 : fix PerSourcePenalty incorrectly using "crash" penalty when LoginGraceTime was exceeded. bz3797 sshd 8 : fix "Match invalid-user" from incorrectly being activated in initial configuration pass when no other predicates were present on the match line sshd 8 : fix debug logging of user specific delay. GHPR 552 sshd 8 : improve debug logging across sub-process boundaries. Previously some log messages were lost early in the sshd-auth and sshd-session processes' life. ssh 1 : require control-escape character sequences passed via the '-e ^x' command-line to be exactly two characters long. Avoids one byte out-of-bounds read if ssh is invoked as "ssh -e^ ..." GHPR368 ssh 1 , sshd 8 : prevent integer overflow in x11 port handling. These are theoretically possible if the admin misconfigured X11DisplayOffset or the user misconfigures their own $DISPLAY, but don't happen in normal operation. bz 3730 ssh-keygen 1 : don't mess up ssh-keygen -l output when the file contains CR characters; GHPR236 bz3385. sshd 8 : add rate limits to logging of connections dropped by PerSourcePenalties. Previously these could be noisy in logs. ssh 1 : fix argument of "Compression" directive in ssh -G config dump, which regressed in openssh-9.8. sshd 8 : fix a corner-case triggered by UpdateHostKeys when sshd refuses to accept the signature returned by an agent holding host keys during the hostkey rotation sub-protocol. This situation could occur in situations where a PKCS 11 smartcard that lacked support for particular signature algorithms was used to store host keys. ssh-keygen 1 : when using RSA keys to sign messages with "ssh-keygen -Y", select the signature algorithm based on the requested hash algorithm "-Ohashalg=xxx" . This allows using something other than the default of rsa-sha2-512, which may not be supported on all signing backends, e.g. some smartcards only support SHA256. ssh 1 , sshd 8 , ssh-keyscan 1 : fix ML-KEM768x25519 KEX on big-endian systems. Many regression and interop test improvements. Portability ----------- All: add support for AWS-LC AWS libcrypto . bz3784 sshd 8 : add wtmpdb support as a Y2038 safe wtmp replacement. sshd 8 : add support for locking sshd into memory, enabled with the --with-linux-memlock-onfault configure flag. Add support for building a standalone sk-libfido2 library, enabled by --with-security-key-standalone ssh 1 , sshd 8 , ssh-keyscan 1 : include builtin popcount replacement function. for compilers that lack it. All: Check for and replace le32toh, le64toh, htole64 separately. It appears that at least some versions of endian.h in glibc do not have the latter two. bz 3794 Remove ancient RHL 6.x config in RPM spec. Checksums: ========== - SHA1 openssh-10.0.tar.gz = 933f4fded0497ef6a588381257276e156a70f9c3 - SHA256 openssh-10.0.tar.gz = oaJ+cXLCVoCZAz9W5W1vF7ko4GJW6iq7JmblrPUA34Q= - SHA1 openssh-10.0p2.tar.gz = ac4205e827aea383bf316a33a0e2d5b66b85fcf8 - SHA256 openssh-10.0p2.tar.gz = AhoucJoO30JQsSVr1anlAEEakN3avqgw7VnO+Q652Fw= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.9p2 was released on 2025-02-18. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.9p1 =========================== This release fixes two security bugs. Security ======== Fix CVE-2025-26465 - ssh 1 in OpenSSH versions 6.8p1 to 9.9p1 inclusive contained a logic error that allowed an on-path attacker a.k.a MITM to impersonate any server when the VerifyHostKeyDNS option is enabled. This option is off by default. Fix CVE-2025-26466 - sshd 8 in OpenSSH versions 9.5p1 to 9.9p1 inclusive is vulnerable to a memory/CPU denial-of-service related to the handling of SSH2 MSG PING packets. This condition may be mitigated using the existing PerSourcePenalties feature. Both vulnerabilities were discovered and demonstrated to be exploitable by the Qualys Security Advisory team. We thank them for their detailed review of OpenSSH. For OpenBSD, fixes to these problems are available as errata; refer to https://www.openbsd.org/errata.html Bugfixes ======== ssh 1 , sshd 8 : fix regression in Match directive that caused failures when predicates and their arguments were separated by '=' characters instead of whitespace bz3739 . sshd 8 : fix the "Match invalid-user" predicate, which was matching incorrectly in the initial pass of config evaluation. ssh 1 , sshd 8 , ssh-keyscan 1 : fix mlkem768x25519-sha256 key exchange on big-endian systems. Fix a number of build problems on particular operating systems / configurations. Checksums: ========== - SHA1 openssh-9.9p2.tar.gz = edefe960645780dee78059c444d4261667ad3056 - SHA256 openssh-9.9p2.tar.gz = karbYD4IzChe3fll4RmdAlhfqU2ZTWyuW0Hhch4hVnM= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.9 was released on 2024-09-19. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025. This release disables DSA by default at compile time. DSA, as specified in the SSHv2 protocol, is inherently weak - being limited to a 160 bit private key and use of the SHA1 digest. Its estimated security level is only 80 bits symmetric equivalent. OpenSSH has disabled DSA keys by default since 2015 but has retained run-time optional support for them. DSA was the only mandatory-to- implement algorithm in the SSHv2 RFCs, mostly because alternative algorithms were encumbered by patents when the SSHv2 protocol was specified. This has not been the case for decades at this point and better algorithms are well supported by all actively-maintained SSH implementations. We do not consider the costs of maintaining DSA in OpenSSH to be justified and hope that removing it from OpenSSH can accelerate its wider deprecation in supporting cryptography libraries. Currently DSA is disabled at compile time. The final step of removing DSA support entirely is planned for the first OpenSSH release of 2025. DSA support may be re-enabled on OpenBSD by setting "DSAKEY=yes" in Makefile.inc. To enable DSA support in portable OpenSSH, pass the "--enable-dsa-keys" option to configure. Potentially-incompatible changes -------------------------------- ssh 1 : remove support for pre-authentication compression. OpenSSH has only supported post-authentication compression in the server for some years. Compression before authentication significantly increases the attack surface of SSH servers and risks creating oracles that reveal information about information sent during authentication. ssh 1 , sshd 8 : processing of the arguments to the "Match" configuration directive now follows more shell-like rules for quoted strings, including allowing nested quotes and \-escaped characters. If configurations contained workarounds for the previous simplistic quote handling then they may need to be adjusted. If this is the case, it's most likely to be in the arguments to a "Match exec" confition. In this case, moving the command to be evaluated from the Match line to an external shell script is easiest way to preserve compatibility with both the old and new versions. Changes since OpenSSH 9.8 ========================= This release contains a number of new features and bugfixes. New features ------------ ssh 1 , sshd 8 : add support for a new hybrid post-quantum key exchange based on the FIPS 203 Module-Lattice Key Enapsulation mechanism ML-KEM combined with X25519 ECDH as described by https://datatracker.ietf.org/doc/html/draft-kampanakis-curdle-ssh-pq-ke-03 This algorithm "mlkem768x25519-sha256" is available by default. ssh 1 : the ssh config "Include" directive can now expand environment as well as the same set of %-tokens "Match Exec" supports. sshd 8 : add a sshd config "RefuseConnection" option that, if set will terminate the connection at the first authentication request. sshd 8 : add a "refuseconnection" penalty class to sshd config PerSourcePenalties that is applied when a connection is dropped by the new RefuseConnection keyword. sshd 8 : add a "Match invalid-user" predicate to sshd config Match options that matches when the target username is not valid on the server. ssh 1 , sshd 8 : update the Streamlined NTRUPrime code to a substantially faster implementation. ssh 1 , sshd 8 : the hybrid Streamlined NTRUPrime/X25519 key exchange algorithm now has an IANA-assigned name in addition to the "@openssh.com" vendor extension name. This algorithm is now also available under this name "sntrup761x25519-sha512" ssh 1 , sshd 8 , ssh-agent 1 : prevent private keys from being included in core dump files for most of their lifespans. This is in addition to pre-existing controls in ssh-agent 1 and sshd 8 that prevented coredumps. This feature is supported on OpenBSD, Linux and FreeBSD. All: convert key handling to use the libcrypto EVP PKEY API, with the exception of DSA. sshd 8 : add a random amount of jitter up to 4 seconds to the grace login time to make its expiry unpredictable. Bugfixes -------- sshd 8 : relax absolute path requirement back to what it was prior to OpenSSH 9.8, which incorrectly required that sshd was started with an absolute path in inetd mode. bz3717 sshd 8 : fix regression introduced in openssh-9.8 that swapped the order of source and destination addresses in some sshd log messages. sshd 8 : do not apply authorized keys options when signature verification fails. Prevents more restrictive key options being incorrectly applied to subsequent keys in authorized keys. bz3733 ssh-keygen 1 : include pathname in some of ssh-keygen's passphrase prompts. Helps the user know what's going on when ssh-keygen is invoked via other tools. Requested in GHPR503 ssh 1 , ssh-add 1 : make parsing user@host consistently look for the last '@' in the string rather than the first. This makes it possible to more consistently use usernames that contain '@' characters. ssh 1 , sshd 8 : be more strict in parsing key type names. Only allow short names e.g "rsa" in user-interface code and require full SSH protocol names e.g. "ssh-rsa" everywhere else. bz3725 regress: many performance and correctness improvements to the re-keying regression test. ssh-keygen 1 : clarify that ed25519 is the default key type generated and clarify that rsa-sha2-512 is the default signature scheme when RSA is in use. GHPR505 sshd 8 : fix minor memory leak in Subsystem option parsing; GHPR515 All: additional hardening and consistency checks for the sshbuf code. sshd 8 : reduce default logingrace penalty to ensure that a single forgotton login that times out will be below the penalty threshold. ssh 1 : fix proxy multiplexing -O proxy bug. If a mux started with ControlPersist then later has a forwarding added using mux proxy connection and the forwarding was used, then when the mux proxy session terminated, the mux master process would issue a bad message that terminated the connection. Portability ----------- sync contrib/ssh-copy-id to the latest upstream version. regress: improve portablility for some awk 1 usage e.g. Solaris In the contrib/redhat RPM spec file, without openssl was previously incorrectly enabled unconditionally. sshd 8 restore audit call before exit that regressed in openssh-9.8 Fixes an issue where the SSH CONNECTION ABANDON event was not recorded. sshd 8 : add support for class-imposed loging restrictions on FreeBSD. Allowing auth hostok 3 and auth timeok 3 to control logins. Build fixes for Musl libc. Fix detection of setres id on GNU/Hurd Checksums: ========== - SHA1 openssh-9.9.tar.gz = 080acf6ff0b862e8faa3baa3920a079536d28e85 - SHA256 openssh-9.9.tar.gz = h1xwa7CVcJfN7I9MgxxPBpUELzo+tnmLy+6slYHTUtw= - SHA1 openssh-9.9p1.tar.gz = 5ded7eb0add0b02b5d1a1c4bf5cb2c89d2117b53 - SHA256 openssh-9.9p1.tar.gz = s0P7zb/4fxWxmG5uFdbU/Jp9NgZr5rf7UHCHuo+WbAI= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.8 was released on 2024-07-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Security ======== This release contains fixes for two security problems, one critical and one minor. 1 Race condition in sshd 8 A critical vulnerability in sshd 8 was present in Portable OpenSSH versions between 8.5p1 and 9.7p1 inclusive that may allow arbitrary code execution with root privileges. Successful exploitation has been demonstrated on 32-bit Linux/glibc systems with ASLR. Under lab conditions, the attack requires on average 6-8 hours of continuous connections up to the maximum the server will accept. Exploitation on 64-bit systems is believed to be possible but has not been demonstrated at this time. It's likely that these attacks will be improved upon. Exploitation on non-glibc systems is conceivable but has not been examined. Systems that lack ASLR or users of downstream Linux distributions that have modified OpenSSH to disable per-connection ASLR re-randomisation yes - this is a thing, no - we don't understand why may potentially have an easier path to exploitation. OpenBSD is not vulnerable. We thank the Qualys Security Advisory Team for discovering, reporting and demonstrating exploitability of this problem, and for providing detailed feedback on additional mitigation measures. 2 Logic error in ssh 1 ObscureKeystrokeTiming In OpenSSH version 9.5 through 9.7 inclusive , when connected to an OpenSSH server version 9.5 or later, a logic error in the ssh 1 ObscureKeystrokeTiming feature on by default rendered this feature ineffective - a passive observer could still detect which network packets contained real keystrokes when the countermeasure was active because both fake and real keystroke packets were being sent unconditionally. This bug was found by Philippos Giavridis and also independently by Jacky Wei En Kung, Daniel Hugenroth and Alastair Beresford of the University of Cambridge Computer Lab. Worse, the unconditional sending of both fake and real keystroke packets broke another long-standing timing attack mitigation. Since OpenSSH 2.9.9 sshd 8 has sent fake keystoke echo packets for traffic received on TTYs in echo-off mode, such as when entering a password into su 8 or sudo 8 . This bug rendered these fake keystroke echoes ineffective and could allow a passive observer of a SSH session to once again detect when echo was off and obtain fairly limited timing information about keystrokes in this situation 20ms granularity by default . This additional implication of the bug was identified by Jacky Wei En Kung, Daniel Hugenroth and Alastair Beresford and we thank them for their detailed analysis. This bug does not affect connections when ObscureKeystrokeTiming was disabled or sessions where no TTY was requested. Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025. This release disables DSA by default at compile time. DSA, as specified in the SSHv2 protocol, is inherently weak - being limited to a 160 bit private key and use of the SHA1 digest. Its estimated security level is only 80 bits symmetric equivalent. OpenSSH has disabled DSA keys by default since 2015 but has retained run-time optional support for them. DSA was the only mandatory-to- implement algorithm in the SSHv2 RFCs, mostly because alternative algorithms were encumbered by patents when the SSHv2 protocol was specified. This has not been the case for decades at this point and better algorithms are well supported by all actively-maintained SSH implementations. We do not consider the costs of maintaining DSA in OpenSSH to be justified and hope that removing it from OpenSSH can accelerate its wider deprecation in supporting cryptography libraries. This release, and its deactivation of DSA by default at compile-time, marks the second step in our timeline to finally deprecate DSA. The final step of removing DSA support entirely is planned for the first OpenSSH release of 2025. DSA support may be re-enabled in OpenBSD by setting "DSAKEY=yes" in Makefile.inc. To enable DSA support in portable OpenSSH, pass the "--enable-dsa-keys" option to configure. Potentially-incompatible changes -------------------------------- all: as mentioned above, the DSA signature algorithm is now disabled at compile time. sshd 8 : the server will now block client addresses that repeatedly fail authentication, repeatedly connect without ever completing authentication or that crash the server. See the discussion of PerSourcePenalties below for more information. Operators of servers that accept connections from many users, or servers that accept connections from addresses behind NAT or proxies may need to consider these settings. sshd 8 : the server has been split into a listener binary, sshd 8 , and a per-session binary "sshd-session". This allows for a much smaller listener binary, as it no longer needs to support the SSH protocol. As part of this work, support for disabling privilege separation which previously required code changes to disable and disabling re-execution of sshd 8 has been removed. Further separation of sshd-session into additional, minimal binaries is planned for the future. sshd 8 : several log messages have changed. In particular, some log messages will be tagged with as originating from a process named "sshd-session" rather than "sshd". ssh-keyscan 1 : this tool previously emitted comment lines containing the hostname and SSH protocol banner to standard error. This release now emits them to standard output, but adds a new "-q" flag to silence them altogether. sshd 8 : portable OpenSSH only sshd will no longer use argv 0 as the PAM service name. A new "PAMServiceName" sshd config 5 directive allows selecting the service name at runtime. This defaults to "sshd". bz2101 portable OpenSSH only Automatically-generated files, such as configure, config.h.in, etc will now be checked in to the portable OpenSSH git release branch e.g. V 9 8 . This should ensure that the contents of the signed release branch exactly match the contents of the signed release tarball. Changes since OpenSSH 9.7 ========================= This release contains mostly bugfixes. New features ------------ sshd 8 : as described above, sshd 8 will now penalise client addresses that, for various reasons, do not successfully complete authentication. This feature is controlled by a new sshd config 5 PerSourcePenalties option and is on by default. sshd 8 will now identify situations where the session did not authenticate as expected. These conditions include when the client repeatedly attempted authentication unsucessfully possibly indicating an attack against one or more accounts, e.g. password guessing , or when client behaviour caused sshd to crash possibly indicating attempts to exploit bugs in sshd . When such a condition is observed, sshd will record a penalty of some duration e.g. 30 seconds against the client's address. If this time is above a minimum configurable threshold, then all connections from the client address will be refused along with any others in the same PerSourceNetBlockSize CIDR range until the penalty expire. Repeated offenses by the same client address will accrue greater penalties, up to a configurable maximum. Address ranges may be fully exempted from penalties, e.g. to guarantee access from a set of trusted management addresses, using the new sshd config 5 PerSourcePenaltyExemptList option. We hope these options will make it significantly more difficult for attackers to find accounts with weak/guessable passwords or exploit bugs in sshd 8 itself. This option is enabled by default. ssh 8 : allow the HostkeyAlgorithms directive to disable the implicit fallback from certificate host key to plain host keys. Bugfixes -------- misc: fix a number of inaccuracies in the PROTOCOL. documentation files. GHPR430 GHPR487 all: switch to strtonum 3 for more robust integer parsing in most places. ssh 1 , sshd 8 : correctly restore sigprocmask around ppoll ssh-keysign 8 : stricter validation of messaging socket fd GHPR492 sftp 1 : flush stdout after writing "sftp " prompt when not using editline. GHPR480 sftp-server 8 : fix home-directory extension implementation, it previously always returned the current user's home directory contrary to the spec. GHPR477 ssh-keyscan 1 : do not close stdin to prevent error messages when stdin is read multiple times. E.g. echo localhost | ssh-keyscan -f - -f - regression tests: fix rekey test that was testing the same KEX algorithm repeatedly instead of testing all of them. bz3692 ssh config 5 , sshd config 5 : clarify the KEXAlgorithms directive documentation, especially around what is supported vs available. bz3701. Portability ----------- sshd 8 : expose SSH AUTH INFO 0 always to PAM auth modules unconditionally. The previous behaviour was to expose it only when particular authentication methods were in use. build: fix OpenSSL ED25519 support detection. An incorrect function signature in configure.ac previously prevented enabling the recently added support for ED25519 private keys in PEM PKCS8 format. ssh 1 , ssh-agent 8 : allow the presence of the WAYLAND DISPLAY environment variable to enable SSH ASKPASS, similarly to the X11 DISPLAY environment variable. GHPR479 build: improve detection of the -fzero-call-used-regs compiler flag. bz3673. build: relax OpenSSL version check to accept all OpenSSL 3.x versions. sshd 8 : add support for notifying systemd on server listen and reload, using a standalone implementation that doesn't depend on libsystemd. bz2641 Checksums: ========== - SHA1 openssh-9.8.tar.gz = bc45cedae7f70b41e9922ef4c9f56e74b9a659b7 - SHA256 openssh-9.8.tar.gz = Dnc69VLWFBFdiaz8wySPlvHjb7wZfh/kblQ8ISuQr1Y= - SHA1 openssh-9.8p1.tar.gz = a0bb501b11349f5c5c33a269351be091dc2c2727 - SHA256 openssh-9.8p1.tar.gz = 3YvQAqN5tdSZ37BQ3R+pr4Ap6ARh9LtsUjxJlz9aOfM= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.7 was released on 2024-03-11. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025 and compile-time disable it later this year. DSA, as specified in the SSHv2 protocol, is inherently weak - being limited to a 160 bit private key and use of the SHA1 digest. Its estimated security level is only 80 bits symmetric equivalent. OpenSSH has disabled DSA keys by default since 2015 but has retained run-time optional support for them. DSA was the only mandatory-to- implement algorithm in the SSHv2 RFCs 3 , mostly because alternative algorithms were encumbered by patents when the SSHv2 protocol was specified. This has not been the case for decades at this point and better algorithms are well supported by all actively-maintained SSH implementations. We do not consider the costs of maintaining DSA in OpenSSH to be justified and hope that removing it from OpenSSH can accelerate its wider deprecation in supporting cryptography libraries. This release makes DSA support in OpenSSH compile-time optional, defaulting to on. We intend the next release to change the default to disable DSA at compile time. The first OpenSSH release of 2025 will remove DSA support entirely. Changes since OpenSSH 9.6 ========================= This release contains mostly bugfixes. New features ------------ ssh 1 , sshd 8 : add a "global" ChannelTimeout type that watches all open channels and will close all open channels if there is no traffic on any of them for the specified interval. This is in addition to the existing per-channel timeouts added recently. This supports situations like having both session and x11 forwarding channels open where one may be idle for an extended period but the other is actively used. The global timeout could close both channels when both have been idle for too long. All: make DSA key support compile-time optional, defaulting to on. Bugfixes -------- sshd 8 : don't append an unnecessary space to the end of subsystem arguments bz3667 ssh 1 : fix the multiplexing "channel proxy" mode, broken when keystroke timing obfuscation was added. GHPR 463 ssh 1 , sshd 8 : fix spurious configuration parsing errors when options that accept array arguments are overridden bz3657 . ssh-agent 1 : fix potential spin in signal handler bz3670 Many fixes to manual pages and other documentation, including GHPR 462, GHPR 454, GHPR 442 and GHPR 441. Greatly improve interop testing against PuTTY. Portability ----------- Improve the error message when the autoconf OpenSSL header check fails bz 3668 Improve detection of broken toolchain -fzero-call-used-regs support bz3645 . Fix regress/misc/fuzz-harness fuzzers and make them compile without warnings when using clang16 Checksums: ========== - SHA1 openssh-9.7.tar.gz = 163272058edc20a8fde81661734a6684c9b4db11 - SHA256 openssh-9.7.tar.gz = gXDWrF4wN2UWyPjyjvVhpjjKd7D2qI6LyZiIYhbJQVg= - SHA1 openssh-9.7p1.tar.gz = ce8985ea0ea2f16a5917fd982ade0972848373cc - SHA256 openssh-9.7p1.tar.gz = SQQm92bYKidj/KzY2D6j1weYdQx70q/y5X3FZg93P/0= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.6 was released on 2023-12-18. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.5 ========================= This release contains a number of security fixes, some small features and bugfixes. Security ======== This release contains fixes for a newly-discovered weakness in the SSH transport protocol, a logic error relating to constrained PKCS 11 keys in ssh-agent 1 and countermeasures for programs that invoke ssh 1 with user or hostnames containing invalid characters. ssh 1 , sshd 8 : implement protocol extensions to thwart the so-called "Terrapin attack" discovered by Fabian Bäumer, Marcus Brinkmann and Jörg Schwenk. This attack allows a MITM to effect a limited break of the integrity of the early encrypted SSH transport protocol by sending extra messages prior to the commencement of encryption, and deleting an equal number of consecutive messages immediately after encryption starts. A peer SSH client/server would not be able to detect that messages were deleted. While cryptographically novel, the security impact of this attack is fortunately very limited as it only allows deletion of consecutive messages, and deleting most messages at this stage of the protocol prevents user user authentication from proceeding and results in a stuck connection. The most serious identified impact is that it lets a MITM to delete the SSH2 MSG EXT INFO message sent before authentication starts, allowing the attacker to disable a subset of the keystroke timing obfuscation features introduced in OpenSSH 9.5. There is no other discernable impact to session secrecy or session integrity. OpenSSH 9.6 addresses this protocol weakness through a new "strict KEX" protocol extension that will be automatically enabled when both the client and server support it. This extension makes two changes to the SSH transport protocol to improve the integrity of the initial key exchange. Firstly, it requires endpoints to terminate the connection if any unnecessary or unexpected message is received during key exchange including messages that were previously legal but not strictly required like SSH2 MSG DEBUG . This removes most malleability from the early protocol. Secondly, it resets the Message Authentication Code counter at the conclusion of each key exchange, preventing previously inserted messages from being able to make persistent changes to the sequence number across completion of a key exchange. Either of these changes should be sufficient to thwart the Terrapin Attack. More details of these changes are in the PROTOCOL file in the OpenSSH source distribition. ssh-agent 1 : when adding PKCS 11-hosted private keys while specifying destination constraints, if the PKCS 11 token returned multiple keys then only the first key had the constraints applied. Use of regular private keys, FIDO tokens and unconstrained keys are unaffected. ssh 1 : if an invalid user or hostname that contained shell metacharacters was passed to ssh 1 , and a ProxyCommand, LocalCommand directive or "match exec" predicate referenced the user or hostname via %u, %h or similar expansion token, then an attacker who could supply arbitrary user/hostnames to ssh 1 could potentially perform command injection depending on what quoting was present in the user-supplied ssh config 5 directive. This situation could arise in the case of git submodules, where a repository could contain a submodule with shell characters in its user/hostname. Git does not ban shell metacharacters in user or host names when checking out repositories from untrusted sources. Although we believe it is the user's responsibility to ensure validity of arguments passed to ssh 1 , especially across a security boundary such as the git example above, OpenSSH 9.6 now bans most shell metacharacters from user and hostnames supplied via the command-line. This countermeasure is not guaranteed to be effective in all situations, as it is infeasible for ssh 1 to universally filter shell metacharacters potentially relevant to user-supplied commands. User/hostnames provided via ssh config 5 are not subject to these restrictions, allowing configurations that use strange names to continue to be used, under the assumption that the user knows what they are doing in their own configuration files. Potentially incompatible changes -------------------------------- ssh 1 , sshd 8 : the RFC4254 connection/channels protocol provides a TCP-like window mechanism that limits the amount of data that can be sent without acceptance from the peer. In cases where this limit was exceeded by a non-conforming peer SSH implementation, ssh 1 /sshd 8 previously discarded the extra data. From OpenSSH 9.6, ssh 1 /sshd 8 will now terminate the connection if a peer exceeds the window limit by more than a small grace factor. This change should have no effect of SSH implementations that follow the specification. New features ------------ ssh 1 : add a %j token that expands to the configured ProxyJump hostname or the empty string if this option is not being used that can be used in a number of ssh config 5 keywords. bz3610 ssh 1 : add ChannelTimeout support to the client, mirroring the same option in the server and allowing ssh 1 to terminate quiescent channels. ssh 1 , sshd 8 , ssh-add 1 , ssh-keygen 1 : add support for reading ED25519 private keys in PEM PKCS8 format. Previously only the OpenSSH private key format was supported. ssh 1 , sshd 8 : introduce a protocol extension to allow renegotiation of acceptable signature algorithms for public key authentication after the server has learned the username being used for authentication. This allows varying sshd config 5 PubkeyAcceptedAlgorithms in a "Match user" block. ssh-add 1 , ssh-agent 1 : add an agent protocol extension to allow specifying certificates when loading PKCS 11 keys. This allows the use of certificates backed by PKCS 11 private keys in all OpenSSH tools that support ssh-agent 1 . Previously only ssh 1 supported this use-case. Bugfixes -------- ssh 1 : when deciding whether to enable the keystroke timing obfuscation, enable it only if a channel with a TTY is active. ssh 1 : switch mainloop from poll 3 to ppoll 3 and mask signals before checking flags set in signal handler. Avoids potential race condition between signaling ssh to exit and polling. bz3531 ssh 1 : when connecting to a destination with both the AddressFamily and CanonicalizeHostname directives in use, the AddressFamily directive could be ignored. bz5326 sftp 1 : correct handling of the limits@openssh.com option when the server returned an unexpected message. A number of fixes to the PuTTY and Dropbear regress/integration tests. ssh 1 : release GSS OIDs only at end of authentication, avoiding unnecessary init/cleanup cycles. bz2982 ssh config 5 : mention "none" is a valid argument to IdentityFile in the manual. bz3080 scp 1 : improved debugging for paths from the server rejected for not matching the client's glob 3 pattern in old SCP/RCP protocol mode. ssh-agent 1 : refuse signing operations on destination-constrained keys if a previous session-bind operation has failed. This may prevent a fail-open situation in future if a user uses a mismatched ssh 1 client and ssh-agent 1 where the client supports a key type that the agent does not support. Portability ----------- Better identify unsupported and unstable compiler flags, such as -fzero-call-used-regs which has been unstable across a several clang releases. A number of fixes to regression test reliability and log collection. Update the OpenSSL dependency in the RPM specification. sshd 8 : for OpenSolaris systems that support privilege limitation via the getpflags interface, prefer using the newer PRIV XPOLICY to PRIV LIMIT. bz2833 Checksums: ========== - SHA1 openssh-9.6.tar.gz = a6d4cb69811e879e2f158c2e597fd9f444b26506 - SHA256 openssh-9.6.tar.gz = nejPUhSnG1R1sOmIBi/t+HMNvsRqfN/DJgjwIU2tvqg= - SHA1 openssh-9.6p1.tar.gz = de300d09ec79fdbf37de4e6672cce4161439f2c3 - SHA256 openssh-9.6p1.tar.gz = kQIRwHJVqMWtZUORtA7lmABxDdgRndU2LeCThap6d3w= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.5 was released on 2023-10-04. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.4 ========================= This release fixes a number of bugs and adds some small features. Potentially incompatible changes -------------------------------- ssh-keygen 1 : generate Ed25519 keys by default. Ed25519 public keys are very convenient due to their small size. Ed25519 keys are specified in RFC 8709 and OpenSSH has supported them since version 6.5 January 2014 . sshd 8 : the Subsystem directive now accurately preserves quoting of subsystem commands and arguments. This may change behaviour for exotic configurations, but the most common subsystem configuration sftp-server is unlikely to be affected. New features ------------ ssh 1 : add keystroke timing obfuscation to the client. This attempts to hide inter-keystroke timings by sending interactive traffic at fixed intervals default: every 20ms when there is only a small amount of data being sent. It also sends fake "chaff" keystrokes for a random interval after the last real keystroke. These are controlled by a new ssh config ObscureKeystrokeTiming keyword. ssh 1 , sshd 8 : Introduce a transport-level ping facility. This adds a pair of SSH transport protocol messages SSH2 MSG PING/PONG to implement a ping capability. These messages use numbers in the "local extensions" number space and are advertised using a "ping@openssh.com" ext-info message with a string version number of "0". sshd 8 : allow override of Subsystem directives in sshd Match blocks. Bugfixes -------- scp 1 : fix scp in SFTP mode recursive upload and download of directories that contain symlinks to other directories. In scp mode, the links would be followed, but in SFTP mode they were not. bz3611 ssh-keygen 1 : handle cr+lf instead of just cr line endings in sshsig signature files. ssh 1 : interactive mode for ControlPersist sessions if they originally requested a tty. sshd 8 : make PerSourceMaxStartups first-match-wins sshd 8 : limit artificial login delay to a reasonable maximum 5s and don't delay at all for the "none" authentication mechanism.cw bz3602 sshd 8 : Log errors in kex exchange identification with level verbose instead of error to reduce preauth log spam. All of those get logged with a more generic error message by sshpkt fatal . sshd 8 : correct math for ClientAliveInterval that caused the probes to be sent less frequently than configured. ssh 1 : fix regression in OpenSSH 9.4 mux.c r1.99 that caused multiplexed sessions to ignore SIGINT under some circumstances. Portability ----------- Avoid clang zero-call-used-regs=all bug on Apple compilers, which for some reason have version numbers that do not match the upstream clang version numbers. bz 3584 Fix configure test for zlib 1.3 and later/development versions. bz3604 Checksums: ========== - SHA1 openssh-9.5.tar.gz = 8a0bd3a91fac338d97d91817af58df731f6509a3 - SHA256 openssh-9.5.tar.gz = sVMxeM3d6g65qBMktJIofxmK4Ipg9dblKif0VnhPeO0= - SHA1 openssh-9.5p1.tar.gz = 35c16dcc6e7d0a9465faa241476ef24f76b196cc - SHA256 openssh-9.5p1.tar.gz = 8Cbnt5un+1QPdRgq+W3IqPHbOV+SK7yfbKYDZyaGCGs= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.4 was released on 2023-08-10. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.3p2 =========================== This release fixes a number of bugs and adds some small features. Potentially incompatible changes -------------------------------- This release removes support for older versions of libcrypto. OpenSSH now requires LibreSSL = 3.1.0 or OpenSSL = 1.1.1. Note that these versions are already deprecated by their upstream vendors. ssh-agent 1 : PKCS 11 modules must now be specified by their full paths. Previously dlopen 3 could search for them in system library directories. New features ------------ ssh 1 : allow forwarding Unix Domain sockets via ssh -W. ssh 1 : add support for configuration tags to ssh 1 . This adds a ssh config 5 "Tag" directive and corresponding "Match tag" predicate that may be used to select blocks of configuration similar to the pf.conf 5 keywords of the same name. ssh 1 : add a "match localnetwork" predicate. This allows matching on the addresses of available network interfaces and may be used to vary the effective client configuration based on network location. ssh 1 , sshd 8 , ssh-keygen 1 : infrastructure support for KRL extensions. This defines wire formats for optional KRL extensions and implements parsing of the new submessages. No actual extensions are supported at this point. sshd 8 : AuthorizedPrincipalsCommand and AuthorizedKeysCommand now accept two additional %-expansion sequences: %D which expands to the routing domain of the connected session and %C which expands to the addresses and port numbers for the source and destination of the connection. ssh-keygen 1 : increase the default work factor rounds for the bcrypt KDF used to derive symmetric encryption keys for passphrase protected key files by 50%. Bugfixes -------- ssh-agent 1 : improve isolation between loaded PKCS 11 modules by running separate ssh-pkcs11-helpers for each loaded provider. ssh 1 : make -f fork after authentication work correctly with multiplexed connections, including ControlPersist. bz3589 bz3589 ssh 1 : make ConnectTimeout apply to multiplexing sockets and not just to network connections. ssh-agent 1 , ssh 1 : improve defences against invalid PKCS 11 modules being loaded by checking that the requested module contains the required symbol before loading it. sshd 8 : fix AuthorizedPrincipalsCommand when AuthorizedKeysCommand appears before it in sshd config. Since OpenSSH 8.7 the AuthorizedPrincipalsCommand directive was incorrectly ignored in this situation. bz3574 sshd 8 , ssh 1 , ssh-keygen 1 : remove vestigal support for KRL signatures When the KRL format was originally defined, it included support for signing of KRL objects. However, the code to sign KRLs and verify KRL signatues was never completed in OpenSSH. This release removes the partially-implemented code to verify KRLs. All OpenSSH tools now ignore KRL SECTION SIGNATURE sections in KRL files. All: fix a number of memory leaks and unreachable/harmless integer overflows. ssh-agent 1 , ssh 1 : don't truncate strings logged from PKCS 11 modules; GHPR406 sshd 8 , ssh 1 : better validate CASignatureAlgorithms in ssh config and sshd config. Previously this directive would accept certificate algorithm names, but these were unusable in practice as OpenSSH does not support CA chains. bz3577 ssh 1 : make ssh -Q CASignatureAlgorithms only list signature algorithms that are valid for CA signing. Previous behaviour was to list all signing algorithms, including certificate algorithms. ssh-keyscan 1 : gracefully handle systems where rlimits or the maximum number of open files is larger than INT MAX; bz3581 ssh-keygen 1 : fix "no comment" not showing on when running ssh-keygen -l on multiple keys where one has a comment and other following keys do not. bz3580 scp 1 , sftp 1 : adjust ftruncate logic to handle servers that reorder requests. Previously, if the server reordered requests then the resultant file would be erroneously truncated. ssh 1 : don't incorrectly disable hostname canonicalization when CanonicalizeHostname=yes and ProxyJump was expicitly set to "none". bz3567 scp 1 : when copying local- remote, check that the source file exists before opening an SFTP connection to the server. Based on GHPR 370 Portability ----------- All: a number of build fixes for various platforms and configuration combinations. sshd 8 : provide a replacement for the SELinux matchpathcon function, which is deprecated. All: relax libcrypto version checks for OpenSSL =3. Beyond OpenSSL 3.0, the ABI compatibility guarantees are wider only the library major must match instead of major and minor in earlier versions . bz 3548. Tests: fix build problems for the sk-dummy.so FIDO provider module used in some tests. Checksums: ========== - SHA1 openssh-9.4.tar.gz = d88126d8d7b8e5bf4656587ac4a16055560641cc - SHA256 openssh-9.4.tar.gz = 7eqFjx2hAunw+1Jy7f1JQXq//3AMr9B3dKtASDtq8go= - SHA1 openssh-9.4p1.tar.gz = 5dea1f3c88f9cfe53a711a3c893ee8b7d3ffecff - SHA256 openssh-9.4p1.tar.gz = Ngj9kIjbIWPOs+YAyFq3nQ3j0iHlkZLqGSPiMmOGaoU= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.3p2 was released on 2023-07-19. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.3 ========================= This release fixes a security bug. Security ======== Fix CVE-2023-38408 - a condition where specific libaries loaded via ssh-agent 1 's PKCS 11 support could be abused to achieve remote code execution via a forwarded agent socket if the following conditions are met: Exploitation requires the presence of specific libraries on the victim system. Remote exploitation requires that the agent was forwarded to an attacker-controlled system. Exploitation can also be prevented by starting ssh-agent 1 with an empty PKCS 11/FIDO allowlist ssh-agent -P '' or by configuring an allowlist that contains only specific provider libraries. This vulnerability was discovered and demonstrated to be exploitable by the Qualys Security Advisory team. In addition to removing the main precondition for exploitation, this release removes the ability for remote ssh-agent 1 clients to load PKCS 11 modules by default see below . Potentially-incompatible changes -------------------------------- ssh-agent 8 : the agent will now refuse requests to load PKCS 11 modules issued by remote clients by default. A flag has been added to restore the previous behaviour "-Oallow-remote-pkcs11". Note that ssh-agent 8 depends on the SSH client to identify requests that are remote. The OpenSSH =8.9 ssh 1 client does this, but forwarding access to an agent socket using other tools may circumvent this restriction. Checksums: ========== - SHA1 openssh-9.3p2.tar.gz = 219cf700c317f400bb20b001c0406056f7188ea4 - SHA256 openssh-9.3p2.tar.gz = IA6+FH9ss/EB/QzfngJEKvfdyimN/9n0VoeOfMrGdug= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.3 was released on 2023-03-15. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.2 ========================= This release fixes a number of security bugs. Security ======== This release contains fixes for a security problem and a memory safety problem. The memory safety problem is not believed to be exploitable, but we report most network-reachable memory faults as security bugs. ssh-add 1 : when adding smartcard keys to ssh-agent 1 with the per-hop destination constraints ssh-add -h ... added in OpenSSH 8.9, a logic error prevented the constraints from being communicated to the agent. This resulted in the keys being added without constraints. The common cases of non-smartcard keys and keys without destination constraints are unaffected. This problem was reported by Luci Stanescu. ssh 1 : Portable OpenSSH provides an implementation of the getrrsetbyname 3 function if the standard library does not provide it, for use by the VerifyHostKeyDNS feature. A specifically crafted DNS response could cause this function to perform an out-of-bounds read of adjacent stack data, but this condition does not appear to be exploitable beyond denial-of- service to the ssh 1 client. The getrrsetbyname 3 replacement is only included if the system's standard library lacks this function and portable OpenSSH was not compiled with the ldns library --with-ldns . getrrsetbyname 3 is only invoked if using VerifyHostKeyDNS to fetch SSHFP records. This problem was found by the Coverity static analyzer. New features ------------ ssh-keygen 1 , ssh-keyscan 1 : accept -Ohashalg=sha1|sha256 when outputting SSHFP fingerprints to allow algorithm selection. bz3493 sshd 8 : add a sshd -G option that parses and prints the effective configuration without attempting to load private keys and perform other checks. This allows usage of the option before keys have been generated and for configuration evaluation and verification by unprivileged users. Bugfixes -------- scp 1 , sftp 1 : fix progressmeter corruption on wide displays; bz3534 ssh-add 1 , ssh-keygen 1 : use RSA/SHA256 when testing usability of private keys as some systems are starting to disable RSA/SHA1 in libcrypto. sftp-server 8 : fix a memory leak. GHPR363 ssh 1 , sshd 8 , ssh-keyscan 1 : remove vestigal protocol compatibility code and simplify what's left. Fix a number of low-impact Coverity static analysis findings. These include several reported via bz2687 ssh config 5 , sshd config 5 : mention that some options are not first-match-wins. Rework logging for the regression tests. Regression tests will now capture separate logs for each ssh and sshd invocation in a test. ssh 1 : make ssh -Q CASignatureAlgorithms work as the manpage says it should; bz3532. ssh 1 : ensure that there is a terminating newline when adding a new entry to known hosts; bz3529 Portability ----------- sshd 8 : harden Linux seccomp sandbox. Move to an allowlist of mmap 2 , madvise 2 and futex 2 flags, removing some concerning kernel attack surface. sshd 8 : improve Linux seccomp-bpf sandbox for older systems; bz3537 Checksums: ========== - SHA1 openssh-9.3.tar.gz = 5f9d2f73ddfe94f3f0a78bdf46704b6ad7b66ec7 - SHA256 openssh-9.3.tar.gz = eRcXkFZByz70DUBUcyIdvU0pVxP2X280FrmV8pyUdrk= - SHA1 openssh-9.3p1.tar.gz = 610959871bf8d6baafc3525811948f85b5dd84ab - SHA256 openssh-9.3p1.tar.gz = 6bq6dwGnalHz2Fpiw4OjydzZf6kAuFm8fbEUwYaK+Kg= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.2 was released on 2023-02-02. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.1 ========================= This release fixes a number of security bugs. Security ======== This release contains fixes for two security problems and a memory safety problem. The memory safety problem is not believed to be exploitable, but we report most network-reachable memory faults as security bugs. sshd 8 : fix a pre-authentication double-free memory fault introduced in OpenSSH 9.1. This is not believed to be exploitable, and it occurs in the unprivileged pre-auth process that is subject to chroot 2 and is further sandboxed on most major platforms. ssh 8 : in OpenSSH releases after 8.7, the PermitRemoteOpen option would ignore its first argument unless it was one of the special keywords "any" or "none", causing the permission list to fail open if only one permission was specified. bz3515 ssh 1 : if the CanonicalizeHostname and CanonicalizePermittedCNAMEs options were enabled, and the system/libc resolver did not check that names in DNS responses were valid, then use of these options could allow an attacker with control of DNS to include invalid characters possibly including wildcards in names added to known hosts files when they were updated. These names would still have to match the CanonicalizePermittedCNAMEs allow-list, so practical exploitation appears unlikely. Potentially-incompatible changes -------------------------------- ssh 1 : add a new EnableEscapeCommandline ssh config 5 option that controls whether the client-side ~C escape sequence that provides a command-line is available. Among other things, the ~C command-line could be used to add additional port-forwards at runtime. This option defaults to "no", disabling the ~C command-line that was previously enabled by default. Turning off the command-line allows platforms that support sandboxing of the ssh 1 client currently only OpenBSD to use a stricter default sandbox policy. New features ------------ sshd 8 : add support for channel inactivity timeouts via a new sshd config 5 ChannelTimeout directive. This allows channels that have not seen traffic in a configurable interval to be automatically closed. Different timeouts may be applied to session, X11, agent and TCP forwarding channels. sshd 8 : add a sshd config UnusedConnectionTimeout option to terminate client connections that have no open channels for a length of time. This complements the ChannelTimeout option above. sshd 8 : add a -V version option to sshd like the ssh client has. ssh 1 : add a "Host" line to the output of ssh -G showing the original hostname argument. bz3343 scp 1 , sftp 1 : add a -X option to both scp 1 and sftp 1 to allow control over some SFTP protocol parameters: the copy buffer length and the number of in-flight requests, both of which are used during upload/download. Previously these could be controlled in sftp 1 only. This makes them available in both SFTP protocol clients using the same option character sequence. ssh-keyscan 1 : allow scanning of complete CIDR address ranges, e.g. "ssh-keyscan 192.168.0.0/24". If a CIDR range is passed, then it will be expanded to all possible addresses in the range including the all-0s and all-1s addresses. bz 976 ssh 1 : support dynamic remote port forwarding in escape command-line's -R processing. bz 3499 Bugfixes -------- ssh 1 : when restoring non-blocking mode to stdio fds, restore exactly the flags that ssh started with and don't just clobber them with zero, as this could also remove the append flag from the set. bz3523 ssh 1 : avoid printf "%s", NULL if using UserKnownHostsFile=none and a hostkey in one of the system known hosts file changes. scp 1 : switch scp from using pipes to a socket-pair for communication with its ssh sub-processes, matching how sftp 1 operates. sshd 8 : clear signal mask early in main ; sshd may have been started with one or more signals masked sigprocmask 2 is not cleared on fork/exec and this could interfere with various things, e.g. the login grace timer. Execution environments that fail to clear the signal mask before running sshd are clearly broken, but apparently they do exist. ssh 1 : warn if no host keys for hostbased auth can be loaded. sshd 8 : Add server debugging for hostbased auth that is queued and sent to the client after successful authentication, but also logged to assist in diagnosis of HostbasedAuthentication problems. bz3507 ssh 1 : document use of the IdentityFile option as being usable to list public keys as well as private keys. GHPR352 sshd 8 : check for and disallow MaxStartups values less than or equal to zero during config parsing, rather than failing later at runtime. bz3489 ssh-keygen 1 : fix parsing of hex cert expiry times specified on the command-line when acting as a CA. scp 1 : when scp 1 is using the SFTP protocol for transport the default , better match scp/rcp's handling of globs that don't match the globbed characters but do match literally e.g. trying to transfer a file named "foo. 1 " . Previously scp 1 in SFTP mode would not match these pathnames but legacy scp/rcp mode would. bz3488 ssh-agent 1 : document the "-O no-restrict-websafe" command-line option. ssh 1 : honour user's umask 2 if it is more restrictive then the ssh default 022 . Portability ----------- sshd 8 : allow writev 2 in the Linux seccomp sandbox. This seems to be used by recent glibcs at least in some configurations during error conditions. bz3512. sshd 8 : simply handling of SSH CONNECTION PAM env var, removing global variable and checking the return value from pam putenv. bz3508 sshd 8 : disable SANDBOX SECCOMP FILTER DEBUG that was mistakenly enabled during the OpenSSH 9.1 release cycle. misc: update autotools and regenerate the config files using the latest autotools all: use -fzero-call-used-regs=used on clang 15 instead of -fzero-call-used-reg=all, as some versions of clang 15 have miscompile code when it was enabled. bz3475 sshd 8 : defer PRNG seeding until after the initial closefrom 2 call. PRNG seeding will initialize OpenSSL, and some engine providers e.g. Intel's QAT will open descriptors for their own use that closefrom 2 could clobber. bz3483 misc: in the poll 2 /ppoll 2 compatibility code, avoid assuming the layout of fd set. sftp-server 8 , ssh-agent 1 : fix ptrace 2 disabling on older FreeBSD kernels. Some versions do not support using id 0 to refer to the current PID for procctl, so try again with getpid explicitly before failing. configure.ac: fix -Wstrict-prototypes in configure test code. Clang 16 now warns on this and legacy prototypes will be removed in C23. GHPR355 configure.ac: fix setres id checks to work with clang-16. glibc has the prototypes for setresuid behind GNU SOURCE, and clang 16 will error out on implicit function definitions. bz3497 Checksums: ========== - SHA1 openssh-9.2.tar.gz = e4b806b7c81b87d6c90afe97b3d016ba6cf3ba1c - SHA256 openssh-9.2.tar.gz = yYe9uaaWSeetXGXOxuaaEiIsLnvITmGW+l5dgMZb9QU= - SHA1 openssh-9.2p1.tar.gz = 3b172b8e971773a7018bbf3231f6589ae539ca4b - SHA256 openssh-9.2p1.tar.gz = P2bb8WVftF9Q4cVtpiqwEhjCKIB7ITONY068351xz0Y= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.1 was released on 2022-10-04. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 9.0 ========================= This release is focused on bug fixing. Security ======== This release contains fixes for three minor memory safety problems. None are believed to be exploitable, but we report most memory safety problems as potential security vulnerabilities out of caution. ssh-keyscan 1 : fix a one-byte overflow in SSH- banner processing. Reported by Qualys ssh-keygen 1 : double free in error path of file hashing step in signing/verify code; GHPR333 ssh-keysign 8 : double-free in error path introduced in openssh-8.9 Potentially-incompatible changes -------------------------------- The portable OpenSSH project now signs commits and release tags using git's recent SSH signature support. The list of developer signing keys is included in the repository as .git allowed signers and is cross-signed using the PGP key that is still used to sign release artifacts: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc ssh 1 , sshd 8 : SetEnv directives in ssh config and sshd config are now first-match-wins to match other directives. Previously if an environment variable was multiply specified the last set value would have been used. bz3438 ssh-keygen 8 : ssh-keygen -A generate all default host key types will no longer generate DSA keys, as these are insecure and have not been used by default for some years. New features ------------ ssh 1 , sshd 8 : add a RequiredRSASize directive to set a minimum RSA key length. Keys below this length will be ignored for user authentication and for host authentication in sshd 8 . ssh 1 will terminate a connection if the server offers an RSA key that falls below this limit, as the SSH protocol does not include the ability to retry a failed key exchange. sftp-server 8 : add a "users-groups-by-id@openssh.com" extension request that allows the client to obtain user/group names that correspond to a set of uids/gids. sftp 1 : use "users-groups-by-id@openssh.com" sftp-server extension when available to fill in user/group names for directory listings. sftp-server 8 : support the "home-directory" extension request defined in draft-ietf-secsh-filexfer-extensions-00. This overlaps a bit with the existing "expand-path@openssh.com", but some other clients support it. ssh-keygen 1 , sshd 8 : allow certificate validity intervals, sshsig verification times and authorized keys expiry-time options to accept dates in the UTC time zone in addition to the default of interpreting them in the system time zone. YYYYMMDD and YYMMDDHHMM SS dates/times will be interpreted as UTC if suffixed with a 'Z' character. Also allow certificate validity intervals to be specified in raw seconds-since-epoch as hex value, e.g. -V 0x1234:0x4567890. This is intended for use by regress tests and other tools that call ssh-keygen as part of a CA workflow. bz3468 sftp 1 : allow arguments to the sftp -D option, e.g. sftp -D "/usr/libexec/sftp-server -el debug3" ssh-keygen 1 : allow the existing -U use agent flag to work with "-Y sign" operations, where it will be interpreted to require that the private keys is hosted in an agent; bz3429 Bugfixes -------- ssh-keygen 1 : implement the "verify-required" certificate option. This was already documented when support for user-verified FIDO keys was added, but the ssh-keygen 1 code was missing. ssh-agent 1 : hook up the restrict websafe command-line flag; previously the flag was accepted but never actually used. sftp 1 : improve filename tab completions: never try to complete names to non-existent commands, and better match the completion type local or remote filename against the argument position being completed. ssh-keygen 1 , ssh 1 , ssh-agent 1 : several fixes to FIDO key handling, especially relating to keys that request user-verification. These should reduce the number of unnecessary PIN prompts for keys that support intrinsic user verification. GHPR302, GHPR329 ssh-keygen 1 : when enrolling a FIDO resident key, check if a credential with matching application and user ID strings already exists and, if so, prompt the user for confirmation before overwriting the credential. GHPR329 sshd 8 : improve logging of errors when opening authorized keys files. bz2042 ssh 1 : avoid multiplexing operations that could cause SIGPIPE from causing the client to exit early. bz3454 ssh config 5 , sshd config 5 : clarify that the RekeyLimit directive applies to both transmitted and received data. GHPR328 ssh-keygen 1 : avoid double fclose in error path. sshd 8 : log an error if pipe fails while accepting a connection. bz3447 ssh 1 , ssh-keygen 1 : fix possible NULL deref when built without FIDO support. bz3443 ssh-keyscan 1 : add missing -sk types to ssh-keyscan manpage. GHPR294. sshd 8 : ensure that authentication passwords are cleared from memory in error paths. GHPR286 ssh 1 , ssh-agent 1 : avoid possibility of notifier code executing kill -1 . GHPR286 ssh config 5 : note that the ProxyJump directive also accepts the same tokens as ProxyCommand. GHPR305. scp 1 : do not not ftruncate 3 files early when in sftp mode. The previous behaviour of unconditionally truncating the destination file would cause "scp ~/foo localhost:foo" and the reverse "scp localhost:foo ~/foo" to delete all the contents of their destination. bz3431 ssh-keygen 1 : improve error message when 'ssh-keygen -Y sign' is unable to load a private key; bz3429 sftp 1 , scp 1 : when performing operations that glob 3 a remote path, ensure that the implicit working directory used to construct that path escapes glob 3 characters. This prevents glob characters from being processed in places they shouldn't, e.g. "cd /tmp/a /", "get .txt" should have the get operation treat the path "/tmp/a " literally and not attempt to expand it. ssh 1 , sshd 8 : be stricter in which characters will be accepted in specifying a mask length; allow only 0-9. GHPR278 ssh-keygen 1 : avoid printing hash algorithm twice when dumping a KRL ssh 1 , sshd 8 : continue running local I/O for open channels during SSH transport rekeying. This should make ~-escapes work in the client e.g. to exit if the connection happened to have stalled during a rekey event. ssh 1 , sshd 8 : avoid potential poll spin during rekeying Further hardening for sshbuf internals: disallow "reparenting" a hierarchical sshbuf and zero the entire buffer if reallocation fails. GHPR287 Portability ----------- ssh 1 , ssh-keygen 1 , sshd 8 : automatically enable the built-in FIDO security key support if libfido2 is found and usable, unless --without-security-key-builtin was requested. ssh 1 , ssh-keygen 1 , sshd 8 : many fixes to make the WinHello FIDO device usable on Cygwin. The windows://hello FIDO device will be automatically used by default on this platform unless requested otherwise, or when probing resident FIDO credentials an operation not currently supported by WinHello . Portable OpenSSH: remove workarounds for obsolete and unsupported versions of OpenSSL libcrypto. In particular, this release removes fallback support for OpenSSL that lacks AES-CTR or AES-GCM. Those AES cipher modes were added to OpenSSL prior to the minimum version currently supported by OpenSSH, so this is not expected to impact any currently supported configurations. sshd 8 : fix SANDBOX SECCOMP FILTER DEBUG on current Linux/glibc All: resync and clean up internal CSPRNG code. scp 1 , sftp 1 , sftp-server 8 : avoid linking these programs with unnecessary libraries. They are no longer linked against libz and libcrypto. This may be of benefit to space constrained systems using any of those components in isolation. sshd 8 : add AUDIT ARCH PPC to supported seccomp sandbox architectures. configure: remove special casing of crypt . configure will no longer search for crypt in libcrypto, as it was removed from there years ago. configure will now only search libc and libcrypt. configure: refuse to use OpenSSL 3.0.4 due to potential RCE in its RSA implementation CVE-2022-2274 on x86 64. All: request 1.1x API compatibility for OpenSSL =3.x; GHPR 322 ssh 1 , ssh-keygen 1 , sshd 8 : fix a number of missing includes required by the XMSS code on some platforms. sshd 8 : cache timezone data in capsicum sandbox. Checksums: ========== - SHA1 openssh-9.1.tar.gz = 3ae2d6a3a695d92778c4c4567dcd6ad481092f6c - SHA256 openssh-9.1.tar.gz = QKfVArlcItV+e8V1Th85TL5//5d/AvOUhYOeHMDEGuE= - SHA1 openssh-9.1p1.tar.gz = 15545440268967511d3194ebf20bcd0c7ff3fcc9 - SHA256 openssh-9.1p1.tar.gz = GfhQCcfj4jeH8CNvuxV4OSq01L+fjsX+a8HNfov90og= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 9.0 was released on 2022-04-08. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Changes since OpenSSH 8.9 ========================= This release is focused on bug fixing. Potentially-incompatible changes -------------------------------- This release switches scp 1 from using the legacy scp/rcp protocol to using the SFTP protocol by default. Legacy scp/rcp performs wildcard expansion of remote filenames e.g. "scp host: ." through the remote shell. This has the side effect of requiring double quoting of shell meta-characters in file names included on scp 1 command-lines, otherwise they could be interpreted as shell commands on the remote side. This creates one area of potential incompatibility: scp 1 when using the SFTP protocol no longer requires this finicky and brittle quoting, and attempts to use it may cause transfers to fail. We consider the removal of the need for double-quoting shell characters in file names to be a benefit and do not intend to introduce bug-compatibility for legacy scp/rcp in scp 1 when using the SFTP protocol. Another area of potential incompatibility relates to the use of remote paths relative to other user's home directories, for example - "scp host:~user/file /tmp". The SFTP protocol has no native way to expand a ~user path. However, sftp-server 8 in OpenSSH 8.7 and later support a protocol extension "expand-path@openssh.com" to support this. In case of incompatibility, the scp 1 client may be instructed to use the legacy scp/rcp using the -O flag. New features ------------ ssh 1 , sshd 8 : use the hybrid Streamlined NTRU Prime + x25519 key exchange method by default "sntrup761x25519-sha512@openssh.com" . The NTRU algorithm is believed to resist attacks enabled by future quantum computers and is paired with the X25519 ECDH key exchange the previous default as a backstop against any weaknesses in NTRU Prime that may be discovered in the future. The combination ensures that the hybrid exchange offers at least as good security as the status quo. We are making this change now i.e. ahead of cryptographically- relevant quantum computers to prevent "capture now, decrypt later" attacks where an adversary who can record and store SSH session ciphertext would be able to decrypt it once a sufficiently advanced quantum computer is available. sftp-server 8 : support the "copy-data" extension to allow server- side copying of files/data, following the design in draft-ietf-secsh-filexfer-extensions-00. bz2948 sftp 1 : add a "cp" command to allow the sftp client to perform server-side file copies. Bugfixes -------- ssh 1 , sshd 8 : upstream: fix poll 2 spin when a channel's output fd closes without data in the channel buffer. bz3405 and bz3411 sshd 8 : pack pollfd array in server listen/accept loop. Could cause the server to hang/spin when MaxStartups RLIMIT NOFILE ssh-keygen 1 : avoid NULL deref via the find-principals and check-novalidate operations. bz3409 and GHPR 307 respectively. scp 1 : fix a memory leak in argument processing. bz3404 sshd 8 : don't try to resolve ListenAddress directives in the sshd re-exec path. They are unused after re-exec and parsing errors possible for example if the host's network configuration changed could prevent connections from being accepted. sshd 8 : when refusing a public key authentication request from a client for using an unapproved or unsupported signature algorithm include the algorithm name in the log message to make debugging easier. Portability ----------- sshd 8 : refactor platform-specific locked account check, fixing an incorrect free on platforms with both libiaf and shadow passwords probably only Unixware GHPR 284, ssh 1 , sshd 8 : Fix possible integer underflow in scan scaled 3 parsing of K/M/G/etc quantities. bz 3401. sshd 8 : provide killpg implementation mostly for Tandem NonStop GHPR 301. Check for missing ftruncate prototype. GHPR 301 sshd 8 : default to not using sandbox when cross compiling. On most systems poll 2 does not work when the number of FDs is reduced with setrlimit, so assume it doesn't when cross compiling and we can't run the test. bz 3398. sshd 8 : allow ppoll time64 in seccomp sandbox. Should fix sandbox violations on some at least i386 and armhf 32bit Linux platforms. bz 3396. Improve detection of -fzero-call-used-regs=all support in configure script. Checksums: ========== - SHA1 openssh-9.0.tar.gz = 05302aa4781e1a69db4261474ed940bd685afc24 - SHA256 openssh-9.0.tar.gz = 9I/FrLf5Gij/4NIPts9A8yWVi0ienyyMqjqn8s0hyLk= - SHA1 openssh-9.0p1.tar.gz = 06dd658874dcd22d66311cf5999bd56c614de509 - SHA256 openssh-9.0p1.tar.gz = A5dDAhYenszjIVPPoQAS8eZcjzdQ9XOnOrG+/Vlyooo= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Please note that the OpenPGP key used to sign releases has been rotated for this release. The new key has been signed by the previous key to provide continuity. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.9 was released on 2022-02-23. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= A near-future release of OpenSSH will switch scp 1 from using the legacy scp/rcp protocol to using SFTP by default. Legacy scp/rcp performs wildcard expansion of remote filenames e.g. "scp host: ." through the remote shell. This has the side effect of requiring double quoting of shell meta-characters in file names included on scp 1 command-lines, otherwise they could be interpreted as shell commands on the remote side. This creates one area of potential incompatibility: scp 1 when using the SFTP protocol no longer requires this finicky and brittle quoting, and attempts to use it may cause transfers to fail. We consider the removal of the need for double-quoting shell characters in file names to be a benefit and do not intend to introduce bug-compatibility for legacy scp/rcp in scp 1 when using the SFTP protocol. Another area of potential incompatibility relates to the use of remote paths relative to other user's home directories, for example - "scp host:~user/file /tmp". The SFTP protocol has no native way to expand a ~user path. However, sftp-server 8 in OpenSSH 8.7 and later support a protocol extension "expand-path@openssh.com" to support this. Security Near Miss ================== sshd 8 : fix an integer overflow in the user authentication path that, in conjunction with other logic errors, could have yielded unauthenticated access under difficult to exploit conditions. This situation is not exploitable because of independent checks in the privilege separation monitor. Privilege separation has been enabled by default in since openssh-3.2.2 released in 2002 and has been mandatory since openssh-7.5 released in 2017 . Moreover, portable OpenSSH has used toolchain features available in most modern compilers to abort on signed integer overflow since openssh-6.5 released in 2014 . Thanks to Malcolm Stagg for finding and reporting this bug. Potentially-incompatible changes ================================ sshd 8 , portable OpenSSH only: this release removes in-built support for MD5-hashed passwords. If you require these on your system then we recommend linking against libxcrypt or similar. This release modifies the FIDO security key middleware interface and increments SSH SK VERSION MAJOR. Changes since OpenSSH 8.8 ========================= This release includes a number of new features. New features ------------ ssh 1 , sshd 8 , ssh-add 1 , ssh-agent 1 : add a system for restricting forwarding and use of keys added to ssh-agent 1 A detailed description of the feature is available at https://www.openssh.com/agent-restrict.html and the protocol extensions are documented in the PROTOCOL and PROTOCOL.agent files in the source release. ssh 1 , sshd 8 : add the sntrup761x25519-sha512@openssh.com hybrid ECDH/x25519 + Streamlined NTRU Prime post-quantum KEX to the default KEXAlgorithms list after the ECDH methods but before the prime-group DH ones . The next release of OpenSSH is likely to make this key exchange the default method. ssh-keygen 1 : when downloading resident keys from a FIDO token, pass back the user ID that was used when the key was created and append it to the filename the key is written to if it is not the default . Avoids keys being clobbered if the user created multiple resident keys with the same application string but different user IDs. ssh-keygen 1 , ssh 1 , ssh-agent 1 : better handling for FIDO keys on tokens that provide user verification UV on the device itself, including biometric keys, avoiding unnecessary PIN prompts. ssh-keygen 1 : add "ssh-keygen -Y match-principals" operation to perform matching of principals names against an allowed signers file. To be used towards a TOFU model for SSH signatures in git. ssh-add 1 , ssh-agent 1 : allow pin-required FIDO keys to be added to ssh-agent 1 . $SSH ASKPASS will be used to request the PIN at authentication time. ssh-keygen 1 : allow selection of hash at sshsig signing time either sha512 default or sha256 . ssh 1 , sshd 8 : read network data directly to the packet input buffer instead of indirectly via a small stack buffer. Provides a modest performance improvement. ssh 1 , sshd 8 : read data directly to the channel input buffer, providing a similar modest performance improvement. ssh 1 : extend the PubkeyAuthentication configuration directive to accept yes|no|unbound|host-bound to allow control over one of the protocol extensions used to implement agent-restricted keys. Bugfixes -------- sshd 8 : document that CASignatureAlgorithms, ExposeAuthInfo and PubkeyAuthOptions can be used in a Match block. PR 277. sshd 8 : fix possible string truncation when constructing paths to .rhosts/.shosts files with very long user home directory names. ssh-keysign 1 : unbreak for KEX algorithms that use SHA384/512 exchange hashes ssh 1 : don't put the TTY into raw mode when SessionType=none, avoids ^C being unable to kill such a session. bz3360 scp 1 : fix some corner-case bugs in SFTP-mode handling of ~-prefixed paths. ssh 1 : unbreak hostbased auth using RSA keys. Allow ssh 1 to select RSA keys when only RSA/SHA2 signature algorithms are configured this is the default case . Previously RSA keys were not being considered in the default case. ssh-keysign 1 : make ssh-keysign use the requested signature algorithm and not the default for the key type. Part of unbreaking hostbased auth for RSA/SHA2 keys. ssh 1 : stricter UpdateHostkey signature verification logic on the client- side. Require RSA/SHA2 signatures for RSA hostkeys except when RSA/SHA1 was explicitly negotiated during initial KEX; bz3375 ssh 1 , sshd 8 : fix signature algorithm selection logic for UpdateHostkeys on the server side. The previous code tried to prefer RSA/SHA2 for hostkey proofs of RSA keys, but missed some cases. This will use RSA/SHA2 signatures for RSA keys if the client proposed these algorithms in initial KEX. bz3375 All: convert all uses of select 2 /pselect 2 to poll 2 /ppoll 2 . This includes the mainloops in ssh 1 , ssh-agent 1 , ssh-agent 1 and sftp-server 8 , as well as the sshd 8 listen loop and all other FD read/writability checks. On platforms with missing or broken poll 2 /ppoll 2 syscalls a select 2 -based compat shim is available. ssh-keygen 1 : the "-Y find-principals" command was verifying key validity when using ca certs but not with simple key lifetimes within the allowed signers file. ssh-keygen 1 : make sshsig verify-time argument parsing optional sshd 8 : fix truncation in rhosts/shosts path construction. ssh 1 , ssh-agent 1 : avoid xmalloc 0 for PKCS 11 keyid for ECDSA keys we already did this for RSA keys . Avoids fatal errors for PKCS 11 libraries that return empty keyid, e.g. Microchip ATECC608B "cryptoauthlib"; bz 3364 ssh 1 , ssh-agent 1 : improve the testing of credentials against inserted FIDO: ask the token whether a particular key belongs to it in cases where the token supports on-token user-verification e.g. biometrics rather than just assuming that it will accept it. Will reduce spurious "Confirm user presence" notifications for key handles that relate to FIDO keys that are not currently inserted in at least some cases. bz3366 ssh 1 , sshd 8 : correct value for IPTOS DSCP LE. It needs to allow for the preceding two ECN bits. bz 3373 ssh-keygen 1 : add missing -O option to usage for the "-Y sign" option. ssh-keygen 1 : fix a NULL deref when using the find-principals function, when matching an allowed signers line that contains a namespace restriction, but no restriction specified on the command-line ssh-agent 1 : fix memleak in process extension ; oss-fuzz issue 42719 ssh 1 : suppress "Connection to xxx closed" messages when LogLevel is set to "error" or above. bz3378 ssh 1 , sshd 8 : use correct zlib flags when inflate 3 -ing compressed packet data. bz3372 scp 1 : when recursively transferring files in SFTP mode, create the destination directory if it doesn't already exist to match scp 1 in legacy RCP mode behaviour. scp 1 : many improvements in error message consistency between scp 1 in SFTP mode vs legacy RCP mode. sshd 8 : fix potential race in SIGTERM handling PR 289 ssh 1 , ssh 8 : since DSA keys are deprecated, move them to the end of the default list of public keys so that they will be tried last. PR 295 ssh-keygen 1 : allow 'ssh-keygen -Y find-principals' to match wildcard principals in allowed signers files Portability ----------- ssh 1 , sshd 8 : don't trust closefrom 2 on Linux. glibc's implementation does not work in a chroot when the kernel does not have close range 2 . It tries to read from /proc/self/fd and when that fails dies with an assertion of sorts. Instead, call close range 2 directly from our compat code and fall back if that fails. bz 3349, OS X poll 2 is broken; use compat replacement. For character- special devices like /dev/null, Darwin's poll 2 returns POLLNVAL when polled with POLLIN. Apparently this is Apple bug 3710161 - not public but a websearch will find other OSS projects rediscovering it periodically since it was first identified in 2005. Correct handling of exceptfds/POLLPRI in our select 2 -based poll 2 /ppoll 2 compat implementation. Cygwin: correct checking of mbstowcs return value. Add a basic SECURITY.md that refers people to the openssh.com website. Enable additional compiler warnings and toolchain hardening flags, including -Wbitwise-instead-of-logical, -Wmisleading-indentation, -fzero-call-used-regs and -ftrivial-auto-var-init. HP/UX. Use compat getline 3 on HP-UX 10.x, where the libc version is not reliable. Checksums: ========== - SHA1 openssh-8.9.tar.gz = 653310ba1a63959fe2df503fe7ad556445180127 - SHA256 openssh-8.9.tar.gz = mJigktP+Bk0sB7uRPuWgjcCOYZ+mIMdvRlZe66irtQA= - SHA1 openssh-8.9p1.tar.gz = 205cdf0040a238047e2c49f43460e03d76e5d650 - SHA256 openssh-8.9p1.tar.gz = /Ul2VLerFobaxnL7g9+0ukCW6LX/zazNJiOArli+xec= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Please note that the OpenPGP key used to sign releases has been rotated for this release. The new key has been signed by the previous key to provide continuity. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.8 was released on 2021-09-26. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= A near-future release of OpenSSH will switch scp 1 from using the legacy scp/rcp protocol to using SFTP by default. Legacy scp/rcp performs wildcard expansion of remote filenames e.g. "scp host: ." through the remote shell. This has the side effect of requiring double quoting of shell meta-characters in file names included on scp 1 command-lines, otherwise they could be interpreted as shell commands on the remote side. This creates one area of potential incompatibility: scp 1 when using the SFTP protocol no longer requires this finicky and brittle quoting, and attempts to use it may cause transfers to fail. We consider the removal of the need for double-quoting shell characters in file names to be a benefit and do not intend to introduce bug- compatibility for legacy scp/rcp in scp 1 when using the SFTP protocol. Another area of potential incompatibility relates to the use of remote paths relative to other user's home directories, for example - "scp host:~user/file /tmp". The SFTP protocol has no native way to expand a ~user path. However, sftp-server 8 in OpenSSH 8.7 and later support a protocol extension "expand-path@openssh.com" to support this. Security ======== sshd 8 from OpenSSH 6.2 through 8.7 failed to correctly initialise supplemental groups when executing an AuthorizedKeysCommand or AuthorizedPrincipalsCommand, where a AuthorizedKeysCommandUser or AuthorizedPrincipalsCommandUser directive has been set to run the command as a different user. Instead these commands would inherit the groups that sshd 8 was started with. Depending on system configuration, inherited groups may allow AuthorizedKeysCommand/AuthorizedPrincipalsCommand helper programs to gain unintended privilege. Neither AuthorizedKeysCommand nor AuthorizedPrincipalsCommand are enabled by default in sshd config 5 . Potentially-incompatible changes ================================ This release disables RSA signatures using the SHA-1 hash algorithm by default. This change has been made as the SHA-1 hash algorithm is cryptographically broken, and it is possible to create chosen-prefix hash collisions for <USD$50K 1 For most users, this change should be invisible and there is no need to replace ssh-rsa keys. OpenSSH has supported RFC8332 RSA/SHA-256/512 signatures since release 7.2 and existing ssh-rsa keys will automatically use the stronger algorithm where possible. Incompatibility is more likely when connecting to older SSH implementations that have not been upgraded or have not closely tracked improvements in the SSH protocol. For these cases, it may be necessary to selectively re-enable RSA/SHA1 to allow connection and/or user authentication via the HostkeyAlgorithms and PubkeyAcceptedAlgorithms options. For example, the following stanza in ~/.ssh/config will enable RSA/SHA1 for host and user authentication for a single destination host: Host old-host HostkeyAlgorithms +ssh-rsa PubkeyAcceptedAlgorithms +ssh-rsa We recommend enabling RSA/SHA1 only as a stopgap measure until legacy implementations can be upgraded or reconfigured with another key type such as ECDSA or Ed25519 . 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Changes since OpenSSH 8.7 ========================= This release is motivated primarily by the above deprecation and security fix. New features ------------ ssh 1 : allow the ssh config 5 CanonicalizePermittedCNAMEs directive to accept a "none" argument to specify the default behaviour. Bugfixes -------- scp 1 : when using the SFTP protocol, continue transferring files after a transfer error occurs, better matching original scp/rcp behaviour. ssh 1 : fixed a number of memory leaks in multiplexing, ssh-keygen 1 : avoid crash when using the -Y find-principals command. A number of documentation and manual improvements, including bz 3340, PR 139, PR 215, PR 241, PR 257 Portability ----------- ssh-agent 1 : on FreeBSD, use procctl to disable ptrace 2 ssh 1 /sshd 8 : some fixes to the pselect 2 replacement compatibility code. bz 3345 Checksums: ========== - SHA1 openssh-8.8.tar.gz = 732947082a8998047e839cc0b4c066bf0a7e1a5b - SHA256 openssh-8.8.tar.gz = AngyrPSQH255hnzU1l7y+LlVAUNcGWtuYQIFEl22nRo= - SHA1 openssh-8.8p1.tar.gz = 1eb964897a4372f6fb96c7effeb509ec71c379c9 - SHA256 openssh-8.8p1.tar.gz = RZCJDqm7ms5Pca4zF4WjpYIyMkNRYZYO1fyGWI8zH+k= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Please note that the OpenPGP key used to sign releases has been rotated for this release. The new key has been signed by the previous key to provide continuity. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.7 was released on 2021-08-20. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Imminent deprecation notice =========================== OpenSSH will disable the ssh-rsa signature scheme by default in the next release. In the SSH protocol, the "ssh-rsa" signature scheme uses the SHA-1 hash algorithm in conjunction with the RSA public key algorithm. It is now possible 1 to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. Note that the deactivation of "ssh-rsa" signatures does not necessarily require cessation of use for RSA keys. In the SSH protocol, keys may be capable of signing using multiple algorithms. In particular, "ssh-rsa" keys are capable of signing using "rsa-sha2-256" RSA/SHA256 , "rsa-sha2-512" RSA/SHA512 and "ssh-rsa" RSA/SHA1 . Only the last of these is being turned off by default. This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs that is still enabled by default. The better alternatives include: The RFC8332 RSA SHA-2 signature algorithms rsa-sha2-256/512. These algorithms have the advantage of using the same key type as "ssh-rsa" but use the safe SHA-2 hash algorithms. These have been supported since OpenSSH 7.2 and are already used by default if the client and server support them. The RFC8709 ssh-ed25519 signature algorithm. It has been supported in OpenSSH since release 6.5. The RFC5656 ECDSA algorithms: ecdsa-sha2-nistp256/384/521. These have been supported by OpenSSH since release 5.7. To check whether a server is using the weak ssh-rsa public key algorithm, for host authentication, try to connect to it after removing the ssh-rsa algorithm from ssh 1 's allowed list: ssh -oHostKeyAlgorithms=-ssh-rsa user@host If the host key verification fails and no other supported host key types are available, the server software on that host should be upgraded. OpenSSH recently enabled the UpdateHostKeys option by default to assist the client by automatically migrating to better algorithms. 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: scp 1 : this release changes the behaviour of remote to remote copies e.g. "scp host-a:/path host-b:" to transfer through the local host by default. This was previously available via the -3 flag. This mode avoids the need to expose credentials on the origin hop, avoids triplicate interpretation of filenames by the shell by the local system, the copy origin and the destination and, in conjunction with the SFTP support for scp 1 mentioned below, allows use of all authentication methods to the remote hosts previously, only non-interactive methods could be used . A -R flag has been added to select the old behaviour. ssh 1 /sshd 8 : both the client and server are now using a stricter configuration file parser. The new parser uses more shell-like rules for quotes, space and escape characters. It is also more strict in rejecting configurations that include options lacking arguments. Previously some options e.g. DenyUsers could appear on a line with no subsequent arguments. This release will reject such configurations. The new parser will also reject configurations with unterminated quotes and multiple '=' characters after the option name. ssh 1 : when using SSHFP DNS records for host key verification, ssh 1 will verify all matching records instead of just those with the specific signature type requested. This may cause host key verification problems if stale SSHFP records of a different or legacy signature type exist alongside other records for a particular host. bz 3322 ssh-keygen 1 : when generating a FIDO key and specifying an explicit attestation challenge using -Ochallenge , the challenge will now be hashed by the builtin security key middleware. This removes the undocumented requirement that challenges be exactly 32 bytes in length and matches the expectations of libfido2. sshd 8 : environment="..." directives in authorized keys files are now first-match-wins and limited to 1024 discrete environment variable names. Changes since OpenSSH 8.6 ========================= This release contains a mix of new features and bug-fixes. New features ------------ - scp 1 : experimental support for transfers using the SFTP protocol as a replacement for the venerable SCP/RCP protocol that it has traditionally used. SFTP offers more predictable filename handling and does not require expansion of glob 3 patterns via the shell on the remote side. SFTP support may be enabled via a temporary scp -s flag. It is intended for SFTP to become the default transfer mode in the near future, at which time the -s flag will be removed. The -O flag exists to force use of the original SCP/RCP protocol for cases where SFTP may be unavailable or incompatible. - sftp-server 8 : add a protocol extension to support expansion of ~/ and ~user/ prefixed paths. This was added to support these paths when used by scp 1 while in SFTP mode. - ssh 1 : add a ForkAfterAuthentication ssh config 5 counterpart to the ssh 1 -f flag. GHPR 231 - ssh 1 : add a StdinNull directive to ssh config 5 that allows the config file to do the same thing as -n does on the ssh 1 command- line. GHPR 231 - ssh 1 : add a SessionType directive to ssh config, allowing the configuration file to offer equivalent control to the -N no session and -s subsystem command-line flags. GHPR 231 - ssh-keygen 1 : allowed signers files used by ssh-keygen 1 signatures now support listing key validity intervals alongside they key, and ssh-keygen 1 can optionally check during signature verification whether a specified time falls inside this interval. This feature is intended for use by git to support signing and verifying objects using ssh keys. - ssh-keygen 8 : support printing of the full public key in a sshsig signature via a -Oprint-pubkey flag. Bugfixes -------- ssh 1 /sshd 8 : start time-based re-keying exactly on schedule in the client and server mainloops. Previously the re-key timeout could expire but re-keying would not start until a packet was sent or received, causing a spin in select if the connection was quiescent. ssh-keygen 1 : avoid Y2038 problem in printing certificate validity lifetimes. Dates past 2^31-1 seconds since epoch were displayed incorrectly on some platforms. bz 3329 scp 1 : allow spaces to appear in usernames for local to remote and scp -3 remote to remote copies. bz 1164 ssh 1 /sshd 8 : remove references to ChallengeResponseAuthentication in favour of KbdInteractiveAuthentication. The former is what was in SSHv1, the latter is what is in SSHv2 RFC4256 and they were treated as somewhat but not entirely equivalent. We retain the old name as a deprecated alias so configuration files continue to work as well as a reference in the man page for people looking for it. bz 3303 ssh 1 /ssh-add 1 /ssh-keygen 1 : fix decoding of X.509 subject name when extracting a key from a PKCS 11 certificate. bz 3327 ssh 1 : restore blocking status on stdio fds before close. ssh 1 needs file descriptors in non-blocking mode to operate but it was not restoring the original state on exit. This could cause problems with fds shared with other programs via the shell, bz 3280 and GHPR 246 ssh 1 /sshd 8 : switch both client and server mainloops from select 3 to pselect 3 . Avoids race conditions where a signal may arrive immediately before select 3 and not be processed until an event fires. bz 2158 ssh 1 : sessions started with ControlPersist were incorrectly executing a shell when the -N no shell option was specified. bz 3290 ssh 1 : check if IPQoS or TunnelDevice are already set before overriding. Prevents values in config files from overriding values supplied on the command line. bz 3319 ssh 1 : fix debug message when finding a private key to match a certificate being attempted for user authentication. Previously it would print the certificate's path, whereas it was supposed to be showing the private key's path. GHPR 247 sshd 8 : match host certificates against host public keys, not private keys. Allows use of certificates with private keys held in a ssh-agent. bz 3524 ssh 1 : add a workaround for a bug in OpenSSH 7.4 sshd 8 , which allows RSA/SHA2 signatures for public key authentication but fails to advertise this correctly via SSH2 MSG EXT INFO. This causes clients of these server to incorrectly match PubkeyAcceptedAlgorithmse and potentially refuse to offer valid keys. bz 3213 sftp 1 /scp 1 : degrade gracefully if a sftp-server offers the limits@openssh.com extension but fails when the client tries to invoke it. bz 3318 ssh 1 : allow ssh config SetEnv to override $TERM, which is otherwise handled specially by the protocol. Useful in ~/.ssh/config to set TERM to something generic e.g. "xterm" instead of "xterm-256color" for destinations that lack terminfo entries. sftp-server 8 : the limits@openssh.com extension was incorrectly marked as an operation that writes to the filesystem, which made it unavailable in sftp-server read-only mode. bz 3318 ssh 1 : fix SEGV in UpdateHostkeys debug message, triggered when the update removed more host keys than remain present. many manual page fixes. Portability ----------- ssh 1 : move closefrom to before first malloc. When built against tcmalloc, the closefrom would stomp on file descriptors created for tcmalloc's internal use. bz 3321 sshd 8 : handle GIDs 2^31 in getgrouplist. When compiled in 32bit mode, the getgrouplist implementation may fail for GIDs greater than LONG MAX. ssh 1 : xstrdup environment variable used by ForwardAgent. bz 3328 sshd 8 : don't sigdie in signal handler in privsep child process; this can end up causing sandbox violations per bz3286 Checksums: ========== - SHA1 openssh-8.7.tar.gz = 61bfa5a55e2b7e851b1d463aa432e4ff508f61cc - SHA256 openssh-8.7.tar.gz = Q5jPfCaYhTKhkDPYH32jtjFN7qhNhkNHYC9awg2THLs= - SHA1 openssh-8.7p1.tar.gz = 8719032c1e47732c8fdb14adfb24b5e9e71de802 - SHA256 openssh-8.7p1.tar.gz = fKNLi7JK6eUPM3krcJGzhB1+G0QP9XvJ+r3fAeLtHiQ= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Please note that the OpenPGP key used to sign releases has been rotated for this release. The new key has been signed by the previous key to provide continuity. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.6 was released on 2021-04-19. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= It is now possible 1 to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. In the SSH protocol, the "ssh-rsa" signature scheme uses the SHA-1 hash algorithm in conjunction with the RSA public key algorithm. OpenSSH will disable this signature scheme by default in the near future. Note that the deactivation of "ssh-rsa" signatures does not necessarily require cessation of use for RSA keys. In the SSH protocol, keys may be capable of signing using multiple algorithms. In particular, "ssh-rsa" keys are capable of signing using "rsa-sha2-256" RSA/SHA256 , "rsa-sha2-512" RSA/SHA512 and "ssh-rsa" RSA/SHA1 . Only the last of these is being turned off by default. This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs that is still enabled by default. The better alternatives include: The RFC8332 RSA SHA-2 signature algorithms rsa-sha2-256/512. These algorithms have the advantage of using the same key type as "ssh-rsa" but use the safe SHA-2 hash algorithms. These have been supported since OpenSSH 7.2 and are already used by default if the client and server support them. The RFC8709 ssh-ed25519 signature algorithm. It has been supported in OpenSSH since release 6.5. The RFC5656 ECDSA algorithms: ecdsa-sha2-nistp256/384/521. These have been supported by OpenSSH since release 5.7. To check whether a server is using the weak ssh-rsa public key algorithm, for host authentication, try to connect to it after removing the ssh-rsa algorithm from ssh 1 's allowed list: ssh -oHostKeyAlgorithms=-ssh-rsa user@host If the host key verification fails and no other supported host key types are available, the server software on that host should be upgraded. OpenSSH recently enabled the UpdateHostKeys option by default to assist the client by automatically migrating to better algorithms. 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Security ======== sshd 8 : OpenSSH 8.5 introduced the LogVerbose keyword. When this option was enabled with a set of patterns that activated logging in code that runs in the low-privilege sandboxed sshd process, the log messages were constructed in such a way that printf 3 format strings could effectively be specified the low-privilege code. An attacker who had sucessfully exploited the low-privilege process could use this to escape OpenSSH's sandboxing and attack the high-privilege process. Exploitation of this weakness is highly unlikely in practice as the LogVerbose option is not enabled by default and is typically only used for debugging. No vulnerabilities in the low-privilege process are currently known to exist. Thanks to Ilja Van Sprundel for reporting this bug. Changes since OpenSSH 8.5 ========================= This release contains mostly bug fixes. New features ------------ sftp-server 8 : add a new limits@openssh.com protocol extension that allows a client to discover various server limits, including maximum packet size and maximum read/write length. sftp 1 : use the new limits@openssh.com extension when available to select better transfer lengths in the client. sshd 8 : Add ModuliFile keyword to sshd config to specify the location of the "moduli" file containing the groups for DH-GEX. unit tests: Add a TEST SSH ELAPSED TIMES environment variable to enable printing of the elapsed time in seconds of each test. Bugfixes -------- ssh config 5 , sshd config 5 : sync CASignatureAlgorithms lists in manual pages with the current default. GHPR 174 ssh 1 : ensure that pkcs11 del provider is called before exit. GHPR 234 ssh 1 , sshd 8 : fix problems in string- argv conversion. Multiple backslashes were not being dequoted correctly and quoted space in the middle of a string was being incorrectly split. GHPR 223 ssh 1 : return non-zero exit status when killed by signal; bz 3281 sftp-server 8 : increase maximum SSH2 FXP READ to match the maximum packet size. Also handle zero-length reads that are not explicitly banned by the spec. Portability ----------- sshd 8 : don't mistakenly exit on transient read errors on the network socket e.g. EINTR, EAGAIN ; bz3297 Create a dedicated contrib/gnome-ssk-askpass3.c source instead of building it from the same file as used for GNOME2. Use the GNOME3 gdk seat grab to manage keyboard/mouse/server grabs for better compatibility with Wayland. Fix portability build errors bz3293 bz3292 bz3291 bz3278 sshd 8 : soft-disallow the fstatat64 syscall in the Linux seccomp-bpf sandbox. bz3276 unit tests: enable autoopt and misc unit tests that were previously skipped Checksums: ========== - SHA1 openssh-8.6.tar.gz = a3e93347eed6296faaaceb221e8786391530fccb - SHA256 openssh-8.6.tar.gz = ihmgdEgKfCBRpC0qzdQRwYownrpBf+rsihvk4Rmim8M= - SHA1 openssh-8.6p1.tar.gz = 8f9f0c94317baeb97747d6258f3997b4542762c0 - SHA256 openssh-8.6p1.tar.gz = w+bk2hYhdiyFDQO0fu0eSN/0zJYI3etUcgKiNN+O164= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Please note that the OpenPGP key used to sign releases has been rotated for this release. The new key has been signed by the previous key to provide continuity. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.5 was released on 2021-03-03. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= It is now possible 1 to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. In the SSH protocol, the "ssh-rsa" signature scheme uses the SHA-1 hash algorithm in conjunction with the RSA public key algorithm. OpenSSH will disable this signature scheme by default in the near future. Note that the deactivation of "ssh-rsa" signatures does not necessarily require cessation of use for RSA keys. In the SSH protocol, keys may be capable of signing using multiple algorithms. In particular, "ssh-rsa" keys are capable of signing using "rsa-sha2-256" RSA/SHA256 , "rsa-sha2-512" RSA/SHA512 and "ssh-rsa" RSA/SHA1 . Only the last of these is being turned off by default. This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs that is still enabled by default. The better alternatives include: The RFC8332 RSA SHA-2 signature algorithms rsa-sha2-256/512. These algorithms have the advantage of using the same key type as "ssh-rsa" but use the safe SHA-2 hash algorithms. These have been supported since OpenSSH 7.2 and are already used by default if the client and server support them. The RFC8709 ssh-ed25519 signature algorithm. It has been supported in OpenSSH since release 6.5. The RFC5656 ECDSA algorithms: ecdsa-sha2-nistp256/384/521. These have been supported by OpenSSH since release 5.7. To check whether a server is using the weak ssh-rsa public key algorithm, for host authentication, try to connect to it after removing the ssh-rsa algorithm from ssh 1 's allowed list: ssh -oHostKeyAlgorithms=-ssh-rsa user@host If the host key verification fails and no other supported host key types are available, the server software on that host should be upgraded. This release enables the UpdateHostKeys option by default to assist the client by automatically migrating to better algorithms. 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Security ======== ssh-agent 1 : fixed a double-free memory corruption that was introduced in OpenSSH 8.2 . We treat all such memory faults as potentially exploitable. This bug could be reached by an attacker with access to the agent socket. On modern operating systems where the OS can provide information about the user identity connected to a socket, OpenSSH ssh-agent and sshd limit agent socket access only to the originating user and root. Additional mitigation may be afforded by the system's malloc 3 /free 3 implementation, if it detects double-free conditions. The most likely scenario for exploitation is a user forwarding an agent either to an account shared with a malicious user or to a host with an attacker holding root access. Portable sshd 8 : Prevent excessively long username going to PAM. This is a mitigation for a buffer overflow in Solaris' PAM username handling CVE-2020-14871 , and is only enabled for Sun-derived PAM implementations. This is not a problem in sshd itself, it only prevents sshd from being used as a vector to attack Solaris' PAM. It does not prevent the bug in PAM from being exploited via some other PAM application. GHPR 212 Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh 1 , sshd 8 : this release changes the first-preference signature algorithm from ECDSA to ED25519. ssh 1 , sshd 8 : set the TOS/DSCP specified in the configuration for interactive use prior to TCP connect. The connection phase of the SSH session is time-sensitive and often explicitly interactive. The ultimate interactive/bulk TOS/DSCP will be set after authentication completes. ssh 1 , sshd 8 : remove the pre-standardization cipher rijndael-cbc@lysator.liu.se. It is an alias for aes256-cbc before it was standardized in RFC4253 2006 , has been deprecated and disabled by default since OpenSSH 7.2 2016 and was only briefly documented in ssh.1 in 2001. ssh 1 , sshd 8 : update/replace the experimental post-quantum hybrid key exchange method based on Streamlined NTRU Prime coupled with X25519. The previous sntrup4591761x25519-sha512@tinyssh.org method is replaced with sntrup761x25519-sha512@openssh.com. Per its designers, the sntrup4591761 algorithm was superseded almost two years ago by sntrup761. note this both the updated method and the one that it replaced are disabled by default ssh 1 : disable CheckHostIP by default. It provides insignificant benefits while making key rotation significantly more difficult, especially for hosts behind IP-based load-balancers. Changes since OpenSSH 8.4 ========================= New features ------------ ssh 1 : this release enables UpdateHostkeys by default subject to some conservative preconditions: - The key was matched in the UserKnownHostsFile and not in the GlobalKnownHostsFile . - The same key does not exist under another name. - A certificate host key is not in use. - known hosts contains no matching wildcard hostname pattern. - VerifyHostKeyDNS is not enabled. - The default UserKnownHostsFile is in use. We expect some of these conditions will be modified or relaxed in future. ssh 1 , sshd 8 : add a new LogVerbose configuration directive for that allows forcing maximum debug logging by file/function/line pattern-lists. ssh 1 : when prompting the user to accept a new hostkey, display any other host names/addresses already associated with the key. ssh 1 : allow UserKnownHostsFile=none to indicate that no known hosts file should be used to identify host keys. ssh 1 : add a ssh config KnownHostsCommand option that allows the client to obtain known hosts data from a command in addition to the usual files. ssh 1 : add a ssh config PermitRemoteOpen option that allows the client to restrict the destination when RemoteForward is used with SOCKS. ssh 1 : for FIDO keys, if a signature operation fails with a "incorrect PIN" reason and no PIN was initially requested from the user, then request a PIN and retry the operation. This supports some biometric devices that fall back to requiring PIN when reading of the biometric failed, and devices that require PINs for all hosted credentials. sshd 8 : implement client address-based rate-limiting via new sshd config 5 PerSourceMaxStartups and PerSourceNetBlockSize directives that provide more fine-grained control on a per-origin address basis than the global MaxStartups limit. Bugfixes -------- ssh 1 : Prefix keyboard interactive prompts with " user@host " to make it easier to determine which connection they are associated with in cases like scp -3, ProxyJump, etc. bz 3224 sshd 8 : fix sshd config SetEnv directives located inside Match blocks. GHPR 201 ssh 1 : when requesting a FIDO token touch on stderr, inform the user once the touch has been recorded. ssh 1 : prevent integer overflow when ridiculously large ConnectTimeout values are specified, capping the effective value for most platforms at 24 days. bz 3229 ssh 1 : consider the ECDSA key subtype when ordering host key algorithms in the client. ssh 1 , sshd 8 : rename the PubkeyAcceptedKeyTypes keyword to PubkeyAcceptedAlgorithms. The previous name incorrectly suggested that it control allowed key algorithms, when this option actually specifies the signature algorithms that are accepted. The previous name remains available as an alias. bz 3253 ssh 1 , sshd 8 : similarly, rename HostbasedKeyTypes ssh and HostbasedAcceptedKeyTypes sshd to HostbasedAcceptedAlgorithms. sftp-server 8 : add missing lsetstat@openssh.com documentation and advertisement in the server's SSH2 FXP VERSION hello packet. ssh 1 , sshd 8 : more strictly enforce KEX state-machine by banning packet types once they are received. Fixes memleak caused by duplicate SSH2 MSG KEX DH GEX REQUEST oss-fuzz 30078 . sftp 1 : allow the full range of UIDs/GIDs for chown/chgrp on 32bit platforms instead of being limited by LONG MAX. bz 3206 Minor man page fixes capitalization, commas, etc. bz 3223 sftp 1 : when doing an sftp recursive upload or download of a read-only directory, ensure that the directory is created with write and execute permissions in the interim so that the transfer can actually complete, then set the directory permission as the final step. bz 3222 ssh-keygen 1 : document the -Z, check the validity of its argument earlier and provide a better error message if it's not correct. bz 2879 ssh 1 : ignore comments at the end of config lines in ssh config, similar to what we already do for sshd config. bz 2320 sshd config 5 : mention that DisableForwarding is valid in a sshd config Match block. bz3239 sftp 1 : fix incorrect sorting of "ls -ltr" under some circumstances. bz3248. ssh 1 , sshd 8 : fix potential integer truncation of unlikely timeout values. bz 3250 ssh 1 : make hostbased authentication send the signature algorithm in its SSH2 MSG USERAUTH REQUEST packets instead of the key type. This make HostbasedAcceptedAlgorithms do what it is supposed to - filter on signature algorithm and not key type. Portability ----------- sshd 8 : add a number of platform-specific syscalls to the Linux seccomp-bpf sandbox. bz 3232 bz 3260 sshd 8 : remove debug message from sigchld handler that could cause deadlock on some platforms. bz 3259 Sync contrib/ssh-copy-id with upstream. unittests: add a hostname function for systems that don't have it. Some systems don't have a hostname command it's not required by POSIX . The do have uname -n which is , but not all of those have it report the FQDN. Checksums: ========== - SHA1 openssh-8.5.tar.gz = 04cae43c389fb411227c01219e4eb46e3113f34e - SHA256 openssh-8.5.tar.gz = 5qB2CgzNG4io4DmChTjHgCWqRWvEOvCKJskLdJCz+SU= - SHA1 openssh-8.5p1.tar.gz = 72eadcbe313b07b1dd3b693e41d3cd56d354e24e - SHA256 openssh-8.5p1.tar.gz = 9S8/QdQpqpkY44zyAK8iXM3Y5m8FLaVyhwyJc3ZG7CU= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available from the mirror sites: https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE KEY.asc Please note that the OpenPGP key used to sign releases has been rotated for this release. The new key has been signed by the previous key to provide continuity. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.4 was released on 2020-09-27. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= It is now possible 1 to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. For this reason, we will be disabling the "ssh-rsa" public key signature algorithm by default in a near-future release. This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs. The better alternatives include: The RFC8332 RSA SHA-2 signature algorithms rsa-sha2-256/512. These algorithms have the advantage of using the same key type as "ssh-rsa" but use the safe SHA-2 hash algorithms. These have been supported since OpenSSH 7.2 and are already used by default if the client and server support them. The ssh-ed25519 signature algorithm. It has been supported in OpenSSH since release 6.5. The RFC5656 ECDSA algorithms: ecdsa-sha2-nistp256/384/521. These have been supported by OpenSSH since release 5.7. To check whether a server is using the weak ssh-rsa public key algorithm, for host authentication, try to connect to it after removing the ssh-rsa algorithm from ssh 1 's allowed list: ssh -oHostKeyAlgorithms=-ssh-rsa user@host If the host key verification fails and no other supported host key types are available, the server software on that host should be upgraded. We intend to enable UpdateHostKeys by default in the next OpenSSH release. This will assist the client by automatically migrating to better algorithms. Users may consider enabling this option manually. 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Security ======== ssh-agent 1 : restrict ssh-agent from signing web challenges for FIDO/U2F keys. When signing messages in ssh-agent using a FIDO key that has an application string that does not start with "ssh:", ensure that the message being signed is one of the forms expected for the SSH protocol currently public key authentication and sshsig signatures . This prevents ssh-agent forwarding on a host that has FIDO keys attached granting the ability for the remote side to sign challenges for web authentication using those keys too. Note that the converse case of web browsers signing SSH challenges is already precluded because no web RP can have the "ssh:" prefix in the application string that we require. ssh-keygen 1 : Enable FIDO 2.1 credProtect extension when generating a FIDO resident key. The recent FIDO 2.1 Client to Authenticator Protocol introduced a "credProtect" feature to better protect resident keys. We use this option to require a PIN prior to all operations that may retrieve a resident key from a FIDO token. Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: For FIDO/U2F support, OpenSSH recommends the use of libfido2 1.5.0 or greater. Older libraries have limited support at the expense of disabling particular features. These include resident keys, PIN- required keys and multiple attached tokens. ssh-keygen 1 : the format of the attestation information optionally recorded when a FIDO key is generated has changed. It now includes the authenticator data needed to validate attestation signatures. The API between OpenSSH and the FIDO token middleware has changed and the SSH SK VERSION MAJOR version has been incremented as a result. Third-party middleware libraries must support the current API version 7 to work with OpenSSH 8.4. The portable OpenSSH distribution now requires automake to rebuild the configure script and supporting files. This is not required when simply building portable OpenSSH from a release tar file. Changes since OpenSSH 8.3 ========================= New features ------------ ssh 1 , ssh-keygen 1 : support for FIDO keys that require a PIN for each use. These keys may be generated using ssh-keygen using a new "verify-required" option. When a PIN-required key is used, the user will be prompted for a PIN to complete the signature operation. sshd 8 : authorized keys now supports a new "verify-required" option to require FIDO signatures assert that the token verified that the user was present before making the signature. The FIDO protocol supports multiple methods for user-verification, but currently OpenSSH only supports PIN verification. sshd 8 , ssh-keygen 1 : add support for verifying FIDO webauthn signatures. Webauthn is a standard for using FIDO keys in web browsers. These signatures are a slightly different format to plain FIDO signatures and thus require explicit support. ssh 1 : allow some keywords to expand shell-style ${ENV} environment variables. The supported keywords are CertificateFile, ControlPath, IdentityAgent and IdentityFile, plus LocalForward and RemoteForward when used for Unix domain socket paths. bz 3140 ssh 1 , ssh-agent 1 : allow some additional control over the use of ssh-askpass via a new $SSH ASKPASS REQUIRE environment variable, including forcibly enabling and disabling its use. bz 69 ssh 1 : allow ssh config 5 's AddKeysToAgent keyword accept a time limit for keys in addition to its current flag options. Time- limited keys will automatically be removed from ssh-agent after their expiry time has passed. scp 1 , sftp 1 : allow the -A flag to explicitly enable agent forwarding in scp and sftp. The default remains to not forward an agent, even when ssh config enables it. ssh 1 : add a '%k' TOKEN that expands to the effective HostKey of the destination. This allows, e.g., keeping host keys in individual files using "UserKnownHostsFile ~/.ssh/known hosts.d/%k". bz 1654 ssh 1 : add %-TOKEN, environment variable and tilde expansion to the UserKnownHostsFile directive, allowing the path to be completed by the configuration e.g. bz 1654 ssh-keygen 1 : allow "ssh-add -d -" to read keys to be deleted from stdin. bz 3180 sshd 8 : improve logging for MaxStartups connection throttling. sshd will now log when it starts and stops throttling and periodically while in this state. bz 3055 Bugfixes -------- ssh 1 , ssh-keygen 1 : better support for multiple attached FIDO tokens. In cases where OpenSSH cannot unambiguously determine which token to direct a request to, the user is now required to select a token by touching it. In cases of operations that require a PIN to be verified, this avoids sending the wrong PIN to the wrong token and incrementing the token's PIN failure counter tokens effectively erase their keys after too many PIN failures . sshd 8 : fix Include before Match in sshd config; bz 3122 ssh 1 : close stdin/out/error when forking after authentication completes "ssh -f ..." bz 3137 ssh 1 , sshd 8 : limit the amount of channel input data buffered, avoiding peers that advertise large windows but are slow to read from causing high memory consumption. ssh-agent 1 : handle multiple requests sent in a single write to the agent. sshd 8 : allow sshd config longer than 256k sshd 8 : avoid spurious "Unable to load host key" message when sshd load a private key but no public counterpart ssh 1 : prefer the default hostkey algorithm list whenever we have a hostkey that matches its best-preference algorithm. sshd 1 : when ordering the hostkey algorithms to request from a server, prefer certificate types if the known hosts files contain a key marked as a @cert-authority; bz 3157 ssh 1 : perform host key fingerprint comparisons for the "Are you sure you want to continue connecting yes/no/ fingerprint ?" prompt with case sensitivity. sshd 8 : ensure that address/masklen mismatches in sshd config yield fatal errors at daemon start time rather than later when they are evaluated. ssh-keygen 1 : ensure that certificate extensions are lexically sorted. Previously if the user specified a custom extension then the everything would be in order except the custom ones. bz 3198 ssh 1 : also compare username when checking for JumpHost loops. bz 3057 ssh-keygen 1 : preserve group/world read permission on known hosts files across runs of "ssh-keygen -Rf /path". The old behaviour was to remove all rights for group/other. bz 3146 ssh-keygen 1 : Mention the -a rounds flag in the ssh-keygen manual page and usage . sshd 8 : explicitly construct path to ~/.ssh/rc rather than relying on it being relative to the current directory, so that it can still be found if the shell startup changes its directory. bz 3185 sshd 8 : when redirecting sshd's log output to a file, undo this redirection after the session child process is forked . Fixes missing log messages when using this feature under some circumstances. sshd 8 : start ClientAliveInterval bookkeeping before first pass through select loop; fixed theoretical case where busy sshd may ignore timeouts from client. ssh 1 : only reset the ServerAliveInterval check when we receive traffic from the server and ignore traffic from a port forwarding client, preventing a client from keeping a connection alive when it should be terminated. bz 2265 ssh-keygen 1 : avoid spurious error message when ssh-keygen creates files outside ~/.ssh sftp-client 1 : fix off-by-one error that caused sftp downloads to make one more concurrent request that desired. This prevented using sftp 1 in unpipelined request/response mode, which is useful when debugging. bz 3054 ssh 1 , sshd 8 : handle EINTR in waitfd and timeout connect helpers. bz 3071 ssh 1 , ssh-keygen 1 : defer creation of ~/.ssh until we attempt to write to it so we don't leave an empty .ssh directory when it's not needed. bz 3156 ssh 1 , sshd 8 : fix multiplier when parsing time specifications when handling seconds after other units. bz 3171 Portability ----------- sshd 8 : always send any PAM account messages. If the PAM account stack returns any messages, always send them to the user and not just if the check succeeds. bz 2049 Implement some backwards compatibility for libfido2 libraries older than 1.5.0. Note that use of an older library will result in the loss of certain features including resident key support, PIN support and support for multiple attached tokens. configure fixes for XCode 12 gnome-ssh-askpass3: ensure the "close" button is not focused by default for SSH ASKPASS PROMPT=none prompts. Avoids space/enter accidentally dismissing FIDO touch notifications. gnome-ssh-askpass3: allow some control over textarea colour via $GNOME SSH ASKPASS FG COLOR and $GNOME SSH ASKPASS BG COLOR environment variables. sshd 8 : document another PAM spec problem in a frustrated comment sshd 8 : support NetBSD's utmpx.ut ss address field. bz 960 Add the ssh-sk-helper binary and its manpage to the RPM spec file Detect the Frankenstein monster of Linux/X32 and allow the sandbox to function there. bz 3085 Checksums: ========== - SHA1 openssh-8.4.tar.gz = 71675139df6807f396e6bd92ff8cb9b0356385d8 - SHA256 openssh-8.4.tar.gz = JhBgLYkyRge/zQK8ylBSRcOYvrV/tHwQcvVXfExGB70= - SHA1 openssh-8.4p1.tar.gz = 69305059e10a60693ebe6f17731f962c9577535c - SHA256 openssh-8.4p1.tar.gz = WgHSLkB+scBbqKj3xlTTiKE+nyJuTtM704dI2vodKyQ= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.3 was released on 2020-05-27. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= It is now possible 1 to perform chosen-prefix attacks against the SHA-1 algorithm for less than USD$50K. For this reason, we will be disabling the "ssh-rsa" public key signature algorithm by default in a near-future release. This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs. The better alternatives include: The RFC8332 RSA SHA-2 signature algorithms rsa-sha2-256/512. These algorithms have the advantage of using the same key type as "ssh-rsa" but use the safe SHA-2 hash algorithms. These have been supported since OpenSSH 7.2 and are already used by default if the client and server support them. The ssh-ed25519 signature algorithm. It has been supported in OpenSSH since release 6.5. The RFC5656 ECDSA algorithms: ecdsa-sha2-nistp256/384/521. These have been supported by OpenSSH since release 5.7. To check whether a server is using the weak ssh-rsa public key algorithm, for host authentication, try to connect to it after removing the ssh-rsa algorithm from ssh 1 's allowed list: ssh -oHostKeyAlgorithms=-ssh-rsa user@host If the host key verification fails and no other supported host key types are available, the server software on that host should be upgraded. A future release of OpenSSH will enable UpdateHostKeys by default to allow the client to automatically migrate to better algorithms. Users may consider enabling this option manually. Vendors of devices that implement the SSH protocol should ensure that they support the new signature algorithms for RSA keys. 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Security ======== scp 1 : when receiving files, scp 1 could be become desynchronised if a utimes 2 system call failed. This could allow file contents to be interpreted as file metadata and thereby permit an adversary to craft a file system that, when copied with scp 1 in a configuration that caused utimes 2 to fail e.g. under a SELinux policy or syscall sandbox , transferred different file names and contents to the actual file system layout. Exploitation of this is not likely as utimes 2 does not fail under normal circumstances. Successful exploitation is not silent - the output of scp 1 would show transfer errors followed by the actual file s that were received. Finally, filenames returned from the peer are since openssh-8.0 matched against the user's requested destination, thereby disallowing a successful exploit from writing files outside the user's selected target glob or directory, in the case of a recursive transfer . This ensures that this attack can achieve no more than a hostile peer is already able to achieve within the scp protocol. Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: sftp 1 : reject an argument of "-1" in the same way as ssh 1 and scp 1 do instead of accepting and silently ignoring it. Changes since OpenSSH 8.2 ========================= The focus of this release is bug fixing. New Features ------------ sshd 8 : make IgnoreRhosts a tri-state option: "yes" to ignore rhosts/shosts, "no" allow rhosts/shosts or new "shosts-only" to allow .shosts files but not .rhosts. sshd 8 : allow the IgnoreRhosts directive to appear anywhere in a sshd config, not just before any Match blocks; bz3148 ssh 1 : add %TOKEN percent expansion for the LocalFoward and RemoteForward keywords when used for Unix domain socket forwarding. bz 3014 all: allow loading public keys from the unencrypted envelope of a private key file if no corresponding public key file is present. ssh 1 , sshd 8 : prefer to use chacha20 from libcrypto where possible instead of the slower portable C implementation included in OpenSSH. ssh-keygen 1 : add ability to dump the contents of a binary key revocation list via "ssh-keygen -lQf /path" bz 3132 Bugfixes -------- ssh 1 : fix IdentitiesOnly=yes to also apply to keys loaded from a PKCS11Provider; bz 3141 ssh-keygen 1 : avoid NULL dereference when trying to convert an invalid RFC4716 private key. scp 1 : when performing remote-to-remote copies using "scp -3", start the second ssh 1 channel with BatchMode=yes enabled to avoid confusing and non-deterministic ordering of prompts. ssh 1 , ssh-keygen 1 : when signing a challenge using a FIDO token, perform hashing of the message to be signed in the middleware layer rather than in OpenSSH code. This permits the use of security key middlewares that perform the hashing implicitly, such as Windows Hello. ssh 1 : fix incorrect error message for "too many known hosts files." bz 3149 ssh 1 : make failures when establishing "Tunnel" forwarding terminate the connection when ExitOnForwardFailure is enabled; bz 3116 ssh-keygen 1 : fix printing of fingerprints on private keys and add a regression test for same. sshd 8 : document order of checking AuthorizedKeysFile first and AuthorizedKeysCommand subsequently, if the file doesn't match ; bz 3134 sshd 8 : document that /etc/hosts.equiv and /etc/shosts.equiv are not considered for HostbasedAuthentication when the target user is root; bz 3148 ssh 1 , ssh-keygen 1 : fix NULL dereference in private certificate key parsing oss-fuzz 20074 . ssh 1 , sshd 8 : more consistency between sets of %TOKENS are accepted in various configuration options. ssh 1 , ssh-keygen 1 : improve error messages for some common PKCS 11 C Login failure cases; bz 3130 ssh 1 , sshd 8 : make error messages for problems during SSH banner exchange consistent with other SSH transport-layer error messages and ensure they include the relevant IP addresses bz 3129 various: fix a number of spelling errors in comments and debug/error messages ssh-keygen 1 , ssh-add 1 : when downloading FIDO2 resident keys from a token, don't prompt for a PIN until the token has told us that it needs one. Avoids double-prompting on devices that implement on-device authentication. sshd 8 , ssh-keygen 1 : no-touch-required FIDO certificate option should be an extension, not a critical option. ssh 1 , ssh-keygen 1 , ssh-add 1 : offer a better error message when trying to use a FIDO key function and SecurityKeyProvider is empty. ssh-add 1 , ssh-agent 8 : ensure that a key lifetime fits within the values allowed by the wire format u32 . Prevents integer wraparound of the timeout values. bz 3119 ssh 1 : detect and prevent trivial configuration loops when using ProxyJump. bz 3057. Portability ----------- Detect systems where signals flagged with SA RESTART will interrupt select 2 . POSIX permits implementations to choose whether select 2 will return when interrupted with a SA RESTART-flagged signal, but OpenSSH requires interrupting behaviour. Several compilation fixes for HP/UX and AIX. On platforms that do not support setting process-wide routing domains all excepting OpenBSD at present , fail to accept a configuration attempts to set one at process start time rather than fatally erroring at run time. bz 3126 Improve detection of egrep used in regression tests on platforms that offer a poor default one e.g. Solaris . A number of shell portability fixes for the regression tests. Fix theoretical infinite loop in the glob 3 replacement implementation. Fix seccomp sandbox compilation problems for some Linux configurations bz 3085 Improved detection of libfido2 and some compilation fixes for some configurations when --with-security-key-builtin is selected. Checksums: ========== - SHA1 openssh-8.3.tar.gz = 46c63b7ddbe46a0666222f7988c993866c31fcca - SHA256 openssh-8.3.tar.gz = M6CnZ+duGs4bzDio8hQNLwyLQChV+3wkUEO8HWLV35c= - SHA1 /openssh-8.3p1.tar.gz = 04c7adb9986f16746588db8988b910530c589819 - SHA256 openssh-8.3p1.tar.gz = 8r774Ecv5+t10jNA6xdTHLazqsJAdeIGa0H4FOEjh7I= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.2 was released on 2020-02-14. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: https://www.openssh.com/donations.html Future deprecation notice ========================= It is now possible 1 to perform chosen-prefix attacks against the SHA-1 hash algorithm for less than USD$50K. For this reason, we will be disabling the "ssh-rsa" public key signature algorithm that depends on SHA-1 by default in a near-future release. This algorithm is unfortunately still used widely despite the existence of better alternatives, being the only remaining public key signature algorithm specified by the original SSH RFCs. The better alternatives include: The RFC8332 RSA SHA-2 signature algorithms rsa-sha2-256/512. These algorithms have the advantage of using the same key type as "ssh-rsa" but use the safe SHA-2 hash algorithms. These have been supported since OpenSSH 7.2 and are already used by default if the client and server support them. The ssh-ed25519 signature algorithm. It has been supported in OpenSSH since release 6.5. The RFC5656 ECDSA algorithms: ecdsa-sha2-nistp256/384/521. These have been supported by OpenSSH since release 5.7. To check whether a server is using the weak ssh-rsa public key algorithm for host authentication, try to connect to it after removing the ssh-rsa algorithm from ssh 1 's allowed list: ssh -oHostKeyAlgorithms=-ssh-rsa user@host If the host key verification fails and no other supported host key types are available, the server software on that host should be upgraded. A future release of OpenSSH will enable UpdateHostKeys by default to allow the client to automatically migrate to better algorithms. Users may consider enabling this option manually. 1 "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T 2020 https://eprint.iacr.org/2020/014.pdf Security ======== ssh 1 , sshd 8 , ssh-keygen 1 : this release removes the "ssh-rsa" RSA/SHA1 algorithm from those accepted for certificate signatures i.e. the client and server CASignatureAlgorithms option and will use the rsa-sha2-512 signature algorithm by default when the ssh-keygen 1 CA signs new certificates. Certificates are at special risk to the aforementioned SHA1 collision vulnerability as an attacker has effectively unlimited time in which to craft a collision that yields them a valid certificate, far more than the relatively brief LoginGraceTime window that they have to forge a host key signature. The OpenSSH certificate format includes a CA-specified typically random nonce value near the start of the certificate that should make exploitation of chosen-prefix collisions in this context challenging, as the attacker does not have full control over the prefix that actually gets signed. Nonetheless, SHA1 is now a demonstrably broken algorithm and futher improvements in attacks are highly likely. OpenSSH releases prior to 7.2 do not support the newer RSA/SHA2 algorithms and will refuse to accept certificates signed by an OpenSSH 8.2+ CA using RSA keys unless the unsafe algorithm is explicitly selected during signing "ssh-keygen -t ssh-rsa" . Older clients/servers may use another CA key type such as ssh-ed25519 supported since OpenSSH 6.5 or one of the ecdsa-sha2-nistp256/384/521 types supported since OpenSSH 5.7 instead if they cannot be upgraded. Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh 1 , sshd 8 : the above removal of "ssh-rsa" from the accepted CASignatureAlgorithms list. ssh 1 , sshd 8 : this release removes diffie-hellman-group14-sha1 from the default key exchange proposal for both the client and server. ssh-keygen 1 : the command-line options related to the generation and screening of safe prime numbers used by the diffie-hellman-group-exchange- key exchange algorithms have changed. Most options have been folded under the -O flag. sshd 8 : the sshd listener process title visible to ps 1 has changed to include information about the number of connections that are currently attempting authentication and the limits configured by MaxStartups. ssh-sk-helper 8 : this is a new binary. It is used by the FIDO/U2F support to provide address-space isolation for token middleware libraries including the internal one . It needs to be installed in the expected path, typically under /usr/libexec or similar. Changes since OpenSSH 8.1 ========================= This release contains some significant new features. FIDO/U2F Support ---------------- This release adds support for FIDO/U2F hardware authenticators to OpenSSH. U2F/FIDO are open standards for inexpensive two-factor authentication hardware that are widely used for website authentication. In OpenSSH FIDO devices are supported by new public key types "ecdsa-sk" and "ed25519-sk", along with corresponding certificate types. ssh-keygen 1 may be used to generate a FIDO token-backed key, after which they may be used much like any other key type supported by OpenSSH, so long as the hardware token is attached when the keys are used. FIDO tokens also generally require the user explicitly authorise operations by touching or tapping them. Generating a FIDO key requires the token be attached, and will usually require the user tap the token to confirm the operation: $ ssh-keygen -t ecdsa-sk -f ~/.ssh/id ecdsa sk Generating public/private ecdsa-sk key pair. You may need to touch your security key to authorize key generation. Enter file in which to save the key /home/djm/.ssh/id ecdsa sk : Enter passphrase empty for no passphrase : Enter same passphrase again: Your identification has been saved in /home/djm/.ssh/id ecdsa sk Your public key has been saved in /home/djm/.ssh/id ecdsa sk.pub This will yield a public and private key-pair. The private key file should be useless to an attacker who does not have access to the physical token. After generation, this key may be used like any other supported key in OpenSSH and may be listed in authorized keys, added to ssh-agent 1 , etc. The only additional stipulation is that the FIDO token that the key belongs to must be attached when the key is used. FIDO tokens are most commonly connected via USB but may be attached via other means such as Bluetooth or NFC. In OpenSSH, communication with the token is managed via a middleware library, specified by the SecurityKeyProvider directive in ssh/sshd config 5 or the $SSH SK PROVIDER environment variable for ssh-keygen 1 and ssh-add 1 . The API for this middleware is documented in the sk-api.h and PROTOCOL.u2f files in the source distribution. OpenSSH includes a middleware "SecurityKeyProvider=internal" with support for USB tokens. It is automatically enabled in OpenBSD and may be enabled in portable OpenSSH via the configure flag --with-security-key-builtin. If the internal middleware is enabled then it is automatically used by default. This internal middleware requires that libfido2 https://github.com/Yubico/libfido2 and its dependencies be installed. We recommend that packagers of portable OpenSSH enable the built-in middleware, as it provides the lowest-friction experience for users. Note: FIDO/U2F tokens are required to implement the ECDSA-P256 "ecdsa-sk" key type, but hardware support for Ed25519 "ed25519-sk" is less common. Similarly, not all hardware tokens support some of the optional features such as resident keys. The protocol-level changes to support FIDO/U2F keys in SSH are documented in the PROTOCOL.u2f file in the OpenSSH source distribution. There are a number of supporting changes to this feature: ssh-keygen 1 : add a "no-touch-required" option when generating FIDO-hosted keys, that disables their default behaviour of requiring a physical touch/tap on the token during authentication. Note: not all tokens support disabling the touch requirement. sshd 8 : add a sshd config PubkeyAuthOptions directive that collects miscellaneous public key authentication-related options for sshd 8 . At present it supports only a single option "no-touch-required". This causes sshd to skip its default check for FIDO/U2F keys that the signature was authorised by a touch or press event on the token hardware. ssh 1 , sshd 8 , ssh-keygen 1 : add a "no-touch-required" option for authorized keys and a similar extension for certificates. This option disables the default requirement that FIDO key signatures attest that the user touched their key to authorize them, mirroring the similar PubkeyAuthOptions sshd config option. ssh-keygen 1 : add support for the writing the FIDO attestation information that is returned when new keys are generated via the "-O write-attestation=/path" option. FIDO attestation certificates may be used to verify that a FIDO key is hosted in trusted hardware. OpenSSH does not currently make use of this information, beyond optionally writing it to disk. FIDO2 resident keys ------------------- FIDO/U2F OpenSSH keys consist of two parts: a "key handle" part stored in the private key file on disk, and a per-device private key that is unique to each FIDO/U2F token and that cannot be exported from the token hardware. These are combined by the hardware at authentication time to derive the real key that is used to sign authentication challenges. For tokens that are required to move between computers, it can be cumbersome to have to move the private key file first. To avoid this requirement, tokens implementing the newer FIDO2 standard support "resident keys", where it is possible to effectively retrieve the key handle part of the key from the hardware. OpenSSH supports this feature, allowing resident keys to be generated using the ssh-keygen 1 "-O resident" flag. This will produce a public/private key pair as usual, but it will be possible to retrieve the private key part from the token later. This may be done using "ssh-keygen -K", which will download all available resident keys from the tokens attached to the host and write public/private key files for them. It is also possible to download and add resident keys directly to ssh-agent 1 without writing files to the file-system using "ssh-add -K". Resident keys are indexed on the token by the application string and user ID. By default, OpenSSH uses an application string of "ssh:" and an empty user ID. If multiple resident keys on a single token are desired then it may be necessary to override one or both of these defaults using the ssh-keygen 1 "-O application=" or "-O user=" options. Note: OpenSSH will only download and use resident keys whose application string begins with "ssh:" Storing both parts of a key on a FIDO token increases the likelihood of an attacker being able to use a stolen token device. For this reason, tokens should enforce PIN authentication before allowing download of keys, and users should set a PIN on their tokens before creating any resident keys. Other New Features ------------------ sshd 8 : add an Include sshd config keyword that allows including additional configuration files via glob 3 patterns. bz2468 ssh 1 /sshd 8 : make the LE low effort DSCP code point available via the IPQoS directive; bz2986, ssh 1 : when AddKeysToAgent=yes is set and the key contains no comment, add the key to the agent with the key's path as the comment. bz2564 ssh-keygen 1 , ssh-agent 1 : expose PKCS 11 key labels and X.509 subjects as key comments, rather than simply listing the PKCS 11 provider library path. PR138 ssh-keygen 1 : allow PEM export of DSA and ECDSA keys; bz3091 ssh 1 , sshd 8 : make zlib compile-time optional, available via the Makefile.inc ZLIB flag on OpenBSD or via the --with-zlib configure option for OpenSSH portable. sshd 8 : when clients get denied by MaxStartups, send a notification prior to the SSH2 protocol banner according to RFC4253 section 4.2. ssh 1 , ssh-agent 1 : when invoking the $SSH ASKPASS prompt program, pass a hint to the program to describe the type of desired prompt. The possible values are "confirm" indicating that a yes/no confirmation dialog with no text entry should be shown , "none" to indicate an informational message only , or blank for the original ssh-askpass behaviour of requesting a password/phrase. ssh 1 : allow forwarding a different agent socket to the path specified by $SSH AUTH SOCK, by extending the existing ForwardAgent option to accepting an explicit path or the name of an environment variable in addition to yes/no. ssh-keygen 1 : add a new signature operations "find-principals" to look up the principal associated with a signature from an allowed- signers file. sshd 8 : expose the number of currently-authenticating connections along with the MaxStartups limit in the process title visible to "ps". Bugfixes -------- sshd 8 : make ClientAliveCountMax=0 have sensible semantics: it will now disable connection killing entirely rather than the current behaviour of instantly killing the connection after the first liveness test regardless of success. bz2627 sshd 8 : clarify order of AllowUsers / DenyUsers vs AllowGroups / DenyGroups in the sshd 8 manual page. bz1690 sshd 8 : better describe HashKnownHosts in the manual page. bz2560 sshd 8 : clarify that that permitopen=/PermitOpen do no name or address translation in the manual page. bz3099 sshd 8 : allow the UpdateHostKeys feature to function when multiple known hosts files are in use. When updating host keys, ssh will now search subsequent known hosts files, but will add updated host keys to the first specified file only. bz2738 All: replace all calls to signal 2 with a wrapper around sigaction 2 . This wrapper blocks all other signals during the handler preventing races between handlers, and sets SA RESTART which should reduce the potential for short read/write operations. sftp 1 : fix a race condition in the SIGCHILD handler that could turn in to a kill -1 ; bz3084 sshd 8 : fix a case where valid but extremely large SSH channel IDs were being incorrectly rejected. bz3098 ssh 1 : when checking host key fingerprints as answers to new hostkey prompts, ignore whitespace surrounding the fingerprint itself. All: wait for file descriptors to be readable or writeable during non-blocking connect, not just readable. Prevents a timeout when the server doesn't immediately send a banner e.g. multiplexers like sslh sshd config 5 : document the sntrup4591761x25519-sha512@tinyssh.org key exchange algorithm. PR 151 Portability ----------- sshd 8 : multiple adjustments to the Linux seccomp sandbox: - Non-fatally deny IPC syscalls in sandbox - Allow clock gettime64 in sandbox MIPS / glibc = 2.31 - Allow clock nanosleep time64 in sandbox ARM bz3100 - Allow clock nanosleep in sandbox recent glibc bz3093 Explicit check for memmem declaration and fix up declaration if the system headers lack it. bz3102 Checksums: ========== - SHA1 openssh-8.2.tar.gz = 0daae2a8c47c489a8784f2c38c4b39e6159ba678 - SHA256 openssh-8.2.tar.gz = +UmInEIoHJqYqWneMb/kgRbLcq8WDCo7+ooYcjzW4jg= - SHA1 openssh-8.2p1.tar.gz = d1ab35a93507321c5db885e02d41ce1414f0507c - SHA256 openssh-8.2p1.tar.gz = Q5JRUebPbO4UUBkMDpr03Da0HBJzdhnt/4vOvf9k5nE= Note: the openssh-8.2 tarball for OpenBSD that was initially released advertised an incorrect version for "ssh -V" and the sshd server banner. The above tarball replace the incorrect release, which has been renamed to openssh-8.2.tar.gz.incorrect. These are the checksums for the original, incorrect tarball: - SHA1 openssh-8.2.tar.gz = 77584c22fbb89269398acdf53c1e554400584ba8 - SHA256 openssh-8.2.tar.gz = UttLaaSYXVK1O65cYvyQzyQ5sCfuJ4Lwrs8zNsPrluQ= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read https://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.1 was released on 2019-10-09. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Security ======== ssh 1 , sshd 8 , ssh-add 1 , ssh-keygen 1 : an exploitable integer overflow bug was found in the private key parsing code for the XMSS key type. This key type is still experimental and support for it is not compiled by default. No user-facing autoconf option exists in portable OpenSSH to enable it. This bug was found by Adam Zabrocki and reported via SecuriTeam's SSD program. ssh 1 , sshd 8 , ssh-agent 1 : add protection for private keys at rest in RAM against speculation and memory side-channel attacks like Spectre, Meltdown and Rambleed. This release encrypts private keys when they are not in use with a symmetric key that is derived from a relatively large "prekey" consisting of random data currently 16KB . Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh-keygen 1 : when acting as a CA and signing certificates with an RSA key, default to using the rsa-sha2-512 signature algorithm. Certificates signed by RSA keys will therefore be incompatible with OpenSSH versions prior to 7.2 unless the default is overridden using "ssh-keygen -t ssh-rsa -s ..." . Changes since OpenSSH 8.0 ========================= This release is focused on bug-fixing. New Features ------------ ssh 1 : Allow %n to be expanded in ProxyCommand strings ssh 1 , sshd 8 : Allow prepending a list of algorithms to the default set by starting the list with the '^' character, E.g. "HostKeyAlgorithms ^ssh-ed25519" ssh-keygen 1 : add an experimental lightweight signature and verification ability. Signatures may be made using regular ssh keys held on disk or stored in a ssh-agent and verified against an authorized keys-like list of allowed keys. Signatures embed a namespace that prevents confusion and attacks between different usage domains e.g. files vs email . ssh-keygen 1 : print key comment when extracting public key from a private key. bz 3052 ssh-keygen 1 : accept the verbose flag when searching for host keys in known hosts i.e. "ssh-keygen -vF host" to print the matching host's random-art signature too. bz 3003 All: support PKCS8 as an optional format for storage of private keys to disk. The OpenSSH native key format remains the default, but PKCS8 is a superior format to PEM if interoperability with non-OpenSSH software is required, as it may use a less insecure key derivation function than PEM's. Bugfixes -------- ssh 1 : if a PKCS 11 token returns no keys then try to login and refetch them. Based on patch from Jakub Jelen; bz 2430 ssh 1 : produce a useful error message if the user's shell is set incorrectly during "match exec" processing. bz 2791 sftp 1 : allow the maximum uint32 value for the argument passed to -b which allows better error messages from later validation. bz 3050 ssh 1 : avoid pledge sandbox violations in some combinations of remote forwarding, connection multiplexing and ControlMaster. ssh-keyscan 1 : include SHA2-variant RSA key algorithms in KEX proposal; allows ssh-keyscan to harvest keys from servers that disable old SHA1 ssh-rsa. bz 3029 sftp 1 : print explicit "not modified" message if a file was requested for resumed download but was considered already complete. bz 2978 sftp 1 : fix a typo and make <esc <right move right to the closest end of a word just like <esc <left moves left to the closest beginning of a word. sshd 8 : cap the number of permitopen/permitlisten directives allowed to appear on a single authorized keys line. All: fix a number of memory leaks one-off or on exit paths . Regression tests: a number of fixes and improvements, including fixes to the interop tests, adding the ability to run most tests on builds that disable OpenSSL support, better support for running tests under Valgrind and a number of bug-fixes. ssh 1 , sshd 8 : check for convtime refusing to accept times that resolve to LONG MAX Reported by Kirk Wolf bz2977 ssh 1 : slightly more instructive error message when the user specifies multiple -J options on the command-line. bz3015 ssh-agent 1 : process agent requests for RSA certificate private keys using correct signature algorithm when requested. bz3016 sftp 1 : check for user@host when parsing sftp target. This allows user@ 1.2.3.4 to work without a path. bz 2999 sshd 8 : enlarge format buffer size for certificate serial number so the log message can record any 64-bit integer without truncation. bz 3012 sshd 8 : for PermitOpen violations add the remote host and port to be able to more easily ascertain the source of the request. Add the same logging for PermitListen violations which where not previously logged at all. scp 1 , sftp 1 : use the correct POSIX format style for left justification for the transfer progress meter. bz 3002 sshd 8 when examining a configuration using sshd -T, assume any attribute not provided by -C does not match, which allows it to work when sshd config contains a Match directive with or without -C. bz 2858 ssh 1 , ssh-keygen 1 : downgrade PKCS 11 "provider returned no slots" warning from log level error to debug. This is common when attempting to enumerate keys on smartcard readers with no cards plugged in. bz 3058 ssh 1 , ssh-keygen 1 : do not unconditionally log in to PKCS 11 tokens. Avoids spurious PIN prompts for keys not selected for authentication in ssh 1 and when listing public keys available in a token using ssh-keygen 1 . bz 3006 Portability ----------- ssh 1 : fix SIGWINCH delivery of Solaris for multiplexed sessions bz 3030 ssh 1 , sshd 8 : fix typo that prevented detection of Linux VRF sshd 8 : add no-op implementation of pam putenv to avoid build breakage on platforms where the PAM implementation lacks this function e.g. HP-UX . bz 3008 sftp-server 8 : fix Solaris privilege sandbox from preventing the legacy sftp rename operation from working was refusing to allow hard links to files owned by other users . bz 3036 All: add a proc pidinfo -based closefrom for OS X to avoid the need to brute-force close all high-numbered file descriptors. bz 3049 sshd 8 : in the Linux seccomp-bpf sandbox, allow mprotect 2 with PROT READ|WRITE|NONE only. This syscall is used by some hardened heap allocators. Github PR 142 sshd 8 : in the Linux seccomp-bpf sandbox, allow the s390-specific ioctl for ECC hardware support. All: use "doc" man page format if the mandoc 1 tool is present on the system. Previously configure would not select the "doc" man page format if mandoc was present but nroff was not. sshd 8 : don't install duplicate STREAMS modules on Solaris; check if STREAMS modules are already installed on a pty before installing since when compiling with XPG =4 they will likely be installed already. Prevents hangs and duplicate lines on the terminal. bz 2945 and bz 2998, Checksums: ========== - SHA1 openssh-8.1.tar.gz = bf7b0c65a7c0afa5ba9c787f345b8a24fa459add - SHA256 openssh-8.1.tar.gz = vamkKxZTFfgxQXSxGeJ1vbuot0H3Vx9bNBgrvChSrFg= - SHA1 openssh-8.1p1.tar.gz = c44b96094869f177735ae053d92bd5fcab1319de - SHA256 openssh-8.1p1.tar.gz = AvXb7zg10HU1VvlzzVe0wZtrH2zSTANEXiOsd8obk/8= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 8.0 was released on 2019-04-17. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Security ======== This release contains mitigation for a weakness in the scp 1 tool and protocol CVE-2019-6111 : when copying files from a remote system to a local directory, scp 1 did not verify that the filenames that the server sent matched those requested by the client. This could allow a hostile server to create or clobber unexpected local files with attacker-controlled content. This release adds client-side checking that the filenames sent from the server match the command-line request, The scp protocol is outdated, inflexible and not readily fixed. We recommend the use of more modern protocols like sftp and rsync for file transfer instead. Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: scp 1 : Relating to the above changes to scp 1 ; the scp protocol relies on the remote shell for wildcard expansion, so there is no infallible way for the client's wildcard matching to perfectly reflect the server's. If there is a difference between client and server wildcard expansion, the client may refuse files from the server. For this reason, we have provided a new "-T" flag to scp that disables these client-side checks at the risk of reintroducing the attack described above. sshd 8 : Remove support for obsolete "host/port" syntax. Slash- separated host/port was added in 2001 as an alternative to host:port syntax for the benefit of IPv6 users. These days there are establised standards for this like ::1 :22 and the slash syntax is easily mistaken for CIDR notation, which OpenSSH supports for some things. Remove the slash notation from ListenAddress and PermitOpen; bz 2335 Changes since OpenSSH 7.9 ========================= This release is focused on new features and internal refactoring. New Features ------------ ssh 1 , ssh-agent 1 , ssh-add 1 : Add support for ECDSA keys in PKCS 11 tokens. ssh 1 , sshd 8 : Add experimental quantum-computing resistant key exchange method, based on a combination of Streamlined NTRU Prime 4591^761 and X25519. ssh-keygen 1 : Increase the default RSA key size to 3072 bits, following NIST Special Publication 800-57's guidance for a 128-bit equivalent symmetric security level. ssh 1 : Allow "PKCS11Provider=none" to override later instances of the PKCS11Provider directive in ssh config; bz 2974 sshd 8 : Add a log message for situations where a connection is dropped for attempting to run a command but a sshd config ForceCommand=internal-sftp restriction is in effect; bz 2960 ssh 1 : When prompting whether to record a new host key, accept the key fingerprint as a synonym for "yes". This allows the user to paste a fingerprint obtained out of band at the prompt and have the client do the comparison for you. ssh-keygen 1 : When signing multiple certificates on a single command-line invocation, allow automatically incrementing the certificate serial number. scp 1 , sftp 1 : Accept -J option as an alias to ProxyJump on the scp and sftp command-lines. ssh-agent 1 , ssh-pkcs11-helper 8 , ssh-add 1 : Accept "-v" command-line flags to increase the verbosity of output; pass verbose flags though to subprocesses, such as ssh-pkcs11-helper started from ssh-agent. ssh-add 1 : Add a "-T" option to allowing testing whether keys in an agent are usable by performing a signature and a verification. sftp-server 8 : Add a "lsetstat@openssh.com" protocol extension that replicates the functionality of the existing SSH2 FXP SETSTAT operation but does not follow symlinks. bz 2067 sftp 1 : Add "-h" flag to chown/chgrp/chmod commands to request they do not follow symlinks. sshd 8 : Expose $SSH CONNECTION in the PAM environment. This makes the connection 4-tuple available to PAM modules that wish to use it in decision-making. bz 2741 sshd 8 : Add a ssh config "Match final" predicate Matches in same pass as "Match canonical" but doesn't require hostname canonicalisation be enabled. bz 2906 sftp 1 : Support a prefix of '@' to suppress echo of sftp batch commands; bz 2926 ssh-keygen 1 : When printing certificate contents using "ssh-keygen -Lf /path/certificate", include the algorithm that the CA used to sign the cert. Bugfixes -------- sshd 8 : Fix authentication failures when sshd config contains "AuthenticationMethods any" inside a Match block that overrides a more restrictive default. sshd 8 : Avoid sending duplicate keepalives when ClientAliveCount is enabled. sshd 8 : Fix two race conditions related to SIGHUP daemon restart. Remnant file descriptors in recently-forked child processes could block the parent sshd's attempt to listen 2 to the configured addresses. Also, the restarting parent sshd could exit before any child processes that were awaiting their re-execution state had completed reading it, leaving them in a fallback path. ssh 1 : Fix stdout potentially being redirected to /dev/null when ProxyCommand=- was in use. sshd 8 : Avoid sending SIGPIPE to child processes if they attempt to write to stderr after their parent processes have exited; bz 2071 ssh 1 : Fix bad interaction between the ssh config ConnectTimeout and ConnectionAttempts directives - connection attempts after the first were ignoring the requested timeout; bz 2918 ssh-keyscan 1 : Return a non-zero exit status if no keys were found; bz 2903 scp 1 : Sanitize scp filenames to allow UTF-8 characters without terminal control sequences; bz 2434 sshd 8 : Fix confusion between ClientAliveInterval and time-based RekeyLimit that could cause connections to be incorrectly closed. bz 2757 ssh 1 , ssh-add 1 : Correct some bugs in PKCS 11 token PIN handling at initial token login. The attempt to read the PIN could be skipped in some cases, particularly on devices with integrated PIN readers. This would lead to an inability to retrieve keys from these tokens. bz 2652 ssh 1 , ssh-add 1 : Support keys on PKCS 11 tokens that set the CKA ALWAYS AUTHENTICATE flag by requring a fresh login after the C SignInit operation. bz 2638 ssh 1 : Improve documentation for ProxyJump/-J, clarifying that local configuration does not apply to jump hosts. ssh-keygen 1 : Clarify manual - ssh-keygen -e only writes public keys, not private. ssh 1 , sshd 8 : be more strict in processing protocol banners, allowing \r characters only immediately before \n. Various: fix a number of memory leaks, including bz 2942 and bz 2938 scp 1 , sftp 1 : fix calculation of initial bandwidth limits. Account for bytes written before the timer starts and adjust the schedule on which recalculations are performed. Avoids an initial burst of traffic and yields more accurate bandwidth limits; bz 2927 sshd 8 : Only consider the ext-info-c extension during the initial key eschange. It shouldn't be sent in subsequent ones, but if it is present we should ignore it. This prevents sshd from sending a SSH MSG EXT INFO for REKEX for buggy these clients. bz 2929 ssh-keygen 1 : Clarify manual that ssh-keygen -F find host in authorized keys and -R remove host from authorized keys options may accept either a bare hostname or a hostname :port combo. bz 2935 ssh 1 : Don't attempt to connect to empty SSH AUTH SOCK; bz 2936 sshd 8 : Silence error messages when sshd fails to load some of the default host keys. Failure to load an explicitly-configured hostkey is still an error, and failure to load any host key is still fatal. pr/103 ssh 1 : Redirect stderr of ProxyCommands to /dev/null when ssh is started with ControlPersist; prevents random ProxyCommand output from interfering with session output. ssh 1 : The ssh client was keeping a redundant ssh-agent socket leftover from authentication around for the life of the connection; bz 2912 sshd 8 : Fix bug in HostbasedAcceptedKeyTypes and PubkeyAcceptedKeyTypes options. If only RSA-SHA2 siganture types were specified, then authentication would always fail for RSA keys as the monitor checks only the base key not the signature algorithm type against AcceptedKeyTypes. bz 2746 ssh 1 : Request correct signature types from ssh-agent when certificate keys and RSA-SHA2 signatures are in use. Portability ----------- sshd 8 : On Cygwin, run as SYSTEM where possible, using S4U for token creation if it supports MsV1 0 S4U Logon. sshd 8 : On Cygwin, use custom user/group matching code that respects the OS' behaviour of case-insensitive matching. sshd 8 : Don't set $MAIL if UsePAM=yes as PAM typically specifies the user environment if it's enabled; bz 2937 sshd 8 Cygwin: Change service name to cygsshd to avoid collision with Microsoft's OpenSSH port. Allow building against OpenSSL -dev 3.x Fix a number of build problems against version configurations and versions of OpenSSL. Including bz 2931 and bz 2921 Improve warnings in cygwin service setup. bz 2922 Remove hardcoded service name in cygwin setup. bz 2922 Checksums: ========== - SHA1 openssh-8.0.tar.gz = 8aaa99091fc7e5a92a4a320e1e5521046b3f95f0 - SHA256 openssh-8.0.tar.gz = 1xvSJk1KYSnOLPYEUzyCVwTEQ7MHOaCO65DzeNuuLdo= - SHA1 openssh-8.0p1.tar.gz = 756dbb99193f9541c9206a667eaa27b0fa184a4f - SHA256 openssh-8.0p1.tar.gz = vZQ4eeaUmOgDHra39E0IzcN9WaeraJqgtDcyDDSB/Wg= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 7.9 was released on 2018-10-19. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh 1 , sshd 8 : the setting of the new CASignatureAlgorithms option see below bans the use of DSA keys as certificate authorities. sshd 8 : the authentication success/failure log message has changed format slightly. It now includes the certificate fingerprint previously it included only key ID and CA key fingerprint . Changes since OpenSSH 7.8 ========================= This is primarily a bugfix release. New Features ------------ ssh 1 , sshd 8 : allow most port numbers to be specified using service names from getservbyname 3 typically /etc/services . ssh 1 : allow the IdentityAgent configuration directive to accept environment variable names. This supports the use of multiple agent sockets without needing to use fixed paths. sshd 8 : support signalling sessions via the SSH protocol. A limited subset of signals is supported and only for login or command sessions i.e. not subsystems that were not subject to a forced command via authorized keys or sshd config. bz 1424 ssh 1 : support "ssh -Q sig" to list supported signature options. Also "ssh -Q help" to show the full set of supported queries. ssh 1 , sshd 8 : add a CASignatureAlgorithms option for the client and server configs to allow control over which signature formats are allowed for CAs to sign certificates. For example, this allows banning CAs that sign certificates using the RSA-SHA1 signature algorithm. sshd 8 , ssh-keygen 1 : allow key revocation lists KRLs to revoke keys specified by SHA256 hash. ssh-keygen 1 : allow creation of key revocation lists directly from base64-encoded SHA256 fingerprints. This supports revoking keys using only the information contained in sshd 8 authentication log messages. Bugfixes -------- ssh 1 , ssh-keygen 1 : avoid spurious "invalid format" errors when attempting to load PEM private keys while using an incorrect passphrase. bz 2901 sshd 8 : when a channel closed message is received from a client, close the stderr file descriptor at the same time stdout is closed. This avoids stuck processes if they were waiting for stderr to close and were insensitive to stdin/out closing. bz 2863 ssh 1 : allow ForwardX11Timeout=0 to disable the untrusted X11 forwarding timeout and support X11 forwarding indefinitely. Previously the behaviour of ForwardX11Timeout=0 was undefined. sshd 8 : when compiled with GSSAPI support, cache supported method OIDs regardless of whether GSSAPI authentication is enabled in the main section of sshd config. This avoids sandbox violations if GSSAPI authentication was later enabled in a Match block. bz 2107 sshd 8 : do not fail closed when configured with a text key revocation list that contains a too-short key. bz 2897 ssh 1 : treat connections with ProxyJump specified the same as ones with a ProxyCommand set with regards to hostname canonicalisation i.e. don't try to canonicalise the hostname unless CanonicalizeHostname is set to 'always' . bz 2896 ssh 1 : fix regression in OpenSSH 7.8 that could prevent public- key authentication using certificates hosted in a ssh-agent 1 or against sshd 8 from OpenSSH <7.8. Portability ----------- All: support building against the openssl-1.1 API releases 1.1.0g and later . The openssl-1.0 API will remain supported at least until OpenSSL terminates security patch support for that API version. sshd 8 : allow the futex 2 syscall in the Linux seccomp sandbox; apparently required by some glibc/OpenSSL combinations. sshd 8 : handle getgrouplist 3 returning more than SC NGROUPS MAX groups. Some platforms consider this limit more as a guideline. Checksums: ========== - SHA1 openssh-7.9.tar.gz = 7c50a86b8f591decd172ed7f5527abc533098dec - SHA256 openssh-7.9.tar.gz = nSVigtHGn3+xKXRqpSnp4YOyEPPAb+pCHdWS9Eh/IPY= - SHA1 openssh-7.9p1.tar.gz = 993aceedea8ecabb1d0dd7293508a361891c4eaa - SHA256 openssh-7.9p1.tar.gz = a0s7oiU9hO03ccgFByjVl8kc/OiYcTvre2SjBbbxGq0= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 7.8 was released on 2018-08-24. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh-keygen 1 : write OpenSSH format private keys by default instead of using OpenSSL's PEM format. The OpenSSH format, supported in OpenSSH releases since 2014 and described in the PROTOCOL.key file in the source distribution, offers substantially better protection against offline password guessing and supports key comments in private keys. If necessary, it is possible to write old PEM-style keys by adding "-m PEM" to ssh-keygen's arguments when generating or updating a key. sshd 8 : remove internal support for S/Key multiple factor authentication. S/Key may still be used via PAM or BSD auth. ssh 1 : remove vestigal support for running ssh 1 as setuid. This used to be required for hostbased authentication and the long gone rhosts-style authentication, but has not been necessary for a long time. Attempting to execute ssh as a setuid binary, or with uid = effective uid will now yield a fatal error at runtime. sshd 8 : the semantics of PubkeyAcceptedKeyTypes and the similar HostbasedAcceptedKeyTypes options have changed. These now specify signature algorithms that are accepted for their respective authentication mechanism, where previously they specified accepted key types. This distinction matters when using the RSA/SHA2 signature algorithms "rsa-sha2-256", "rsa-sha2-512" and their certificate counterparts. Configurations that override these options but omit these algorithm names may cause unexpected authentication failures no action is required for configurations that accept the default for these options . sshd 8 : the precedence of session environment variables has changed. ~/.ssh/environment and environment="..." options in authorized keys files can no longer override SSH variables set implicitly by sshd. ssh 1 /sshd 8 : the default IPQoS used by ssh/sshd has changed. They will now use DSCP AF21 for interactive traffic and CS1 for bulk. For a detailed rationale, please see the commit message: https://cvsweb.openbsd.org/log/src/usr.bin/ssh/readconf.c,v rev1.284 Changes since OpenSSH 7.7 ========================= This is primarily a bugfix release. New Features ------------ ssh 1 /sshd 8 : add new signature algorithms "rsa-sha2-256-cert- v01@openssh.com" and "rsa-sha2-512-cert-v01@openssh.com" to explicitly force use of RSA/SHA2 signatures in authentication. sshd 8 : extend the PermitUserEnvironment option to accept a whitelist of environment variable names in addition to global "yes" or "no" settings. sshd 8 : add a PermitListen directive to sshd config 5 and a corresponding permitlisten= authorized keys option that control which listen addresses and port numbers may be used by remote forwarding ssh -R ... . sshd 8 : add some countermeasures against timing attacks used for account validation/enumeration. sshd will enforce a minimum time or each failed authentication attempt consisting of a global 5ms minimum plus an additional per-user 0-4ms delay derived from a host secret. sshd 8 : add a SetEnv directive to allow an administrator to explicitly specify environment variables in sshd config. Variables set by SetEnv override the default and client-specified environment. ssh 1 : add a SetEnv directive to request that the server sets an environment variable in the session. Similar to the existing SendEnv option, these variables are set subject to server configuration. ssh 1 : allow "SendEnv -PATTERN" to clear environment variables previously marked for sending to the server. bz 1285 ssh 1 /sshd 8 : make UID available as a %-expansion everywhere that the username is available currently. bz 2870 ssh 1 : allow setting ProxyJump=none to disable ProxyJump functionality. bz 2869 Bugfixes -------- sshd 8 : avoid observable differences in request parsing that could be used to determine whether a target user is valid. all: substantial internal refactoring ssh 1 /sshd 8 : fix some memory leaks; bz 2366 ssh 1 : fix a pwent clobber introduced in openssh-7.7 that could occur during key loading, manifesting as crash on some platforms. sshd config 5 : clarify documentation for AuthenticationMethods option; bz 2663 ssh 1 : ensure that the public key algorithm sent in a public key SSH MSG USERAUTH REQUEST matches the content of the signature blob. Previously, these could be inconsistent when a legacy or non-OpenSSH ssh-agent returned a RSA/SHA1 signature when asked to make a RSA/SHA2 signature. sshd 8 : fix failures to read authorized keys caused by faulty supplemental group caching. bz 2873 scp 1 : apply umask to directories, fixing potential mkdir/chmod race when copying directory trees bz 2839 ssh-keygen 1 : return correct exit code when searching for and hashing known hosts entries in a single operation; bz 2772 ssh 1 : prefer the ssh binary pointed to via argv 0 to $PATH when re-executing ssh for ProxyJump. bz 2831 sshd 8 : do not ban PTY allocation when a sshd session is restricted because the user password is expired as it breaks password change dialog. regression in openssh-7.7 . ssh 1 /sshd 8 : fix error reporting from select failures. ssh 1 : improve documentation for -w tunnel flag, emphasising that -w implicitly sets Tunnel=point-to-point. bz 2365 ssh-agent 1 : implement EMFILE mitigation for ssh-agent. ssh-agent will no longer spin when its file descriptor limit is exceeded. bz 2576 ssh 1 /sshd 8 : disable SSH2 MSG DEBUG messages for Twisted Conch clients. Twisted Conch versions that lack a version number in their identification strings will mishandle these messages when running on Python 2.x https://twistedmatrix.com/trac/ticket/9422 sftp 1 : notify user immediately when underlying ssh process dies expectedly. bz 2719 ssh 1 /sshd 8 : fix tunnel forwarding; regression in 7.7 release. bz 2855 ssh-agent 1 : don't kill ssh-agent's listening socket entirely if it fails to accept 2 a connection. bz 2837 sshd 8 : relax checking of authorized keys environment="..." options to allow underscores in variable names regression introduced in 7.7 . bz 2851 ssh 1 : add some missing options in the configuration dump output ssh -G . bz 2835 Portability ----------- sshd 8 : Expose details of completed authentication to PAM auth modules via SSH AUTH INFO 0 in the PAM environment. bz 2408 Fix compilation problems caused by fights between zlib and OpenSSL colliding uses of "free func" Improve detection of unsupported compiler options. Recently these may have manifested as "unsupported -Wl,-z,retpoline" warnings during linking. sshd 8 : some sandbox support for Linux/s390 bz 2752. regress tests: unbreak key-options.sh test on platforms without openpty 3 . bz 2856 use getrandom 2 for PRNG seeding when built without OpenSSL. Checksums: ========== - SHA1 openssh-7.8.tar.gz = ed5511cd42b543cd15166a9cbc56705f23b847e7 - SHA256 openssh-7.8.tar.gz = TDqIsMEmghsBUNCrSCPyCxChfitntyOLXNC694py1XE - SHA1 openssh-7.8p1.tar.gz = 27e267e370315561de96577fccae563bc2c37a60 - SHA256 openssh-7.8p1.tar.gz = GkhLsVFSwYO7JRThEqow3TQTjDz7Ay7uVJCmbFBxRMo Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 7.7 was released on 2018-04-02. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh 1 /sshd 8 : Drop compatibility support for some very old SSH implementations, including ssh.com <=2. and OpenSSH <= 3. . These versions were all released in or before 2001 and predate the final SSH RFCs. The support in question isn't necessary for RFC-compliant SSH implementations. Changes since OpenSSH 7.6 ========================= This is primarily a bugfix release. New Features ------------ All: Add experimental support for PQC XMSS keys Extended Hash- Based Signatures based on the algorithm described in https://tools.ietf.org/html/draft-irtf-cfrg-xmss-hash-based-signatures-12 The XMSS signature code is experimental and not compiled in by default. sshd 8 : Add a "rdomain" criteria for the sshd config Match keyword to allow conditional configuration that depends on which routing domain a connection was received on currently supported on OpenBSD and Linux . sshd config 5 : Add an optional rdomain qualifier to the ListenAddress directive to allow listening on different routing domains. This is supported only on OpenBSD and Linux at present. sshd config 5 : Add RDomain directive to allow the authenticated session to be placed in an explicit routing domain. This is only supported on OpenBSD at present. sshd 8 : Add "expiry-time" option for authorized keys files to allow for expiring keys. ssh 1 : Add a BindInterface option to allow binding the outgoing connection to an interface's address basically a more usable BindAddress ssh 1 : Expose device allocated for tun/tap forwarding via a new %T expansion for LocalCommand. This allows LocalCommand to be used to prepare the interface. sshd 8 : Expose the device allocated for tun/tap forwarding via a new SSH TUNNEL environment variable. This allows automatic setup of the interface and surrounding network configuration automatically on the server. ssh 1 /scp 1 /sftp 1 : Add URI support to ssh, sftp and scp, e.g. ssh://user@host or sftp://user@host/path. Additional connection parameters described in draft-ietf-secsh-scp-sftp-ssh-uri-04 are not implemented since the ssh fingerprint format in the draft uses the deprecated MD5 hash with no way to specify the any other algorithm. ssh-keygen 1 : Allow certificate validity intervals that specify only a start or stop time instead of both or neither . sftp 1 : Allow "cd" and "lcd" commands with no explicit path argument. lcd will change to the local user's home directory as usual. cd will change to the starting directory for session because the protocol offers no way to obtain the remote user's home directory . bz 2760 sshd 8 : When doing a config test with sshd -T, only require the attributes that are actually used in Match criteria rather than an incomplete list of all criteria. Bugfixes -------- ssh 1 /sshd 8 : More strictly check signature types during key exchange against what was negotiated. Prevents downgrade of RSA signatures made with SHA-256/512 to SHA-1. sshd 8 : Fix support for client that advertise a protocol version of "1.99" indicating that they are prepared to accept both SSHv1 and SSHv2 . This was broken in OpenSSH 7.6 during the removal of SSHv1 support. bz 2810 ssh 1 : Warn when the agent returns a ssh-rsa SHA1 signature when a rsa-sha2-256/512 signature was requested. This condition is possible when an old or non-OpenSSH agent is in use. bz 2799 ssh-agent 1 : Fix regression introduced in 7.6 that caused ssh-agent to fatally exit if presented an invalid signature request message. sshd config 5 : Accept yes/no flag options case-insensitively, as has been the case in ssh config 5 for a long time. bz 2664 ssh 1 : Improve error reporting for failures during connection. Under some circumstances misleading errors were being shown. bz 2814 ssh-keyscan 1 : Add -D option to allow printing of results directly in SSHFP format. bz 2821 regress tests: fix PuTTY interop test broken in last release's SSHv1 removal. bz 2823 ssh 1 : Compatibility fix for some servers that erroneously drop the connection when the IUTF8 RFC8160 option is sent. scp 1 : Disable RemoteCommand and RequestTTY in the ssh session started by scp sftp was already doing this. ssh-keygen 1 : Refuse to create a certificate with an unusable number of principals. ssh-keygen 1 : Fatally exit if ssh-keygen is unable to write all the public key during key generation. Previously it would silently ignore errors writing the comment and terminating newline. ssh 1 : Do not modify hostname arguments that are addresses by automatically forcing them to lower-case. Instead canonicalise them to resolve ambiguities e.g. ::0001 = ::1 before they are matched against known hosts. bz 2763 ssh 1 : Don't accept junk after "yes" or "no" responses to hostkey prompts. bz 2803 sftp 1 : Have sftp print a warning about shell cleanliness when decoding the first packet fails, which is usually caused by shells polluting stdout of non-interactive startups. bz 2800 ssh 1 /sshd 8 : Switch timers in packet code from using wall-clock time to monotonic time, allowing the packet layer to better function over a clock step and avoiding possible integer overflows during steps. Numerous manual page fixes and improvements. Portability ----------- sshd 8 : Correctly detect MIPS ABI in use at configure time. Fixes sandbox violations on some environments. sshd 8 : Remove UNICOS support. The hardware and software are literal museum pieces and support in sshd is too intrusive to justify maintaining. All: Build and link with "retpoline" flags when available to mitigate the "branch target injection" style variant 2 of the Spectre branch-prediction vulnerability. All: Add auto-generated dependency information to Makefile. Numerous fixed to the RPM spec files. Checksums: ========== - SHA1 openssh-7.7.tar.gz = 24812e05fa233014c847c7775748316e7f8a836c - SHA256 openssh-7.7.tar.gz = T4ua1L/vgAYqwB0muRahvnm5ZUr3PLY9nPljaG8egvo= - SHA1 openssh-7.7p1.tar.gz = 446fe9ed171f289f0d62197dffdbfdaaf21c49f2 - SHA256 openssh-7.7p1.tar.gz = 1zvn5oTpnvzQJL4Vowv/y+QbASsvezyQhK7WIXdea48= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH 7.6 was released on 2017-10-03. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: ssh 1 : delete SSH protocol version 1 support, associated configuration options and documentation. ssh 1 /sshd 8 : remove support for the hmac-ripemd160 MAC. ssh 1 /sshd 8 : remove support for the arcfour, blowfish and CAST ciphers. Refuse RSA keys <1024 bits in length and improve reporting for keys that do not meet this requirement. ssh 1 : do not offer CBC ciphers by default. Changes since OpenSSH 7.5 ========================= This is primarily a bugfix release. It also contains substantial internal refactoring. Security -------- sftp-server 8 : in read-only mode, sftp-server was incorrectly permitting creation of zero-length files. Reported by Michal Zalewski. New Features ------------ ssh 1 : add RemoteCommand option to specify a command in the ssh config file instead of giving it on the client's command line. This allows the configuration file to specify the command that will be executed on the remote host. sshd 8 : add ExposeAuthInfo option that enables writing details of the authentication methods used including public keys where applicable to a file that is exposed via a $SSH USER AUTH environment variable in the subsequent session. ssh 1 : add support for reverse dynamic forwarding. In this mode, ssh will act as a SOCKS4/5 proxy and forward connections to destinations requested by the remote SOCKS client. This mode is requested using extended syntax for the -R and RemoteForward options and, because it is implemented solely at the client, does not require the server be updated to be supported. sshd 8 : allow LogLevel directive in sshd config Match blocks; bz 2717 ssh-keygen 1 : allow inclusion of arbitrary string or flag certificate extensions and critical options. ssh-keygen 1 : allow ssh-keygen to use a key held in ssh-agent as a CA when signing certificates. bz 2377 ssh 1 /sshd 8 : allow IPQoS=none in ssh/sshd to not set an explicit ToS/DSCP value and just use the operating system default. ssh-add 1 : added -q option to make ssh-add quiet on success. ssh 1 : expand the StrictHostKeyChecking option with two new settings. The first "accept-new" will automatically accept hitherto-unseen keys but will refuse connections for changed or invalid hostkeys. This is a safer subset of the current behaviour of StrictHostKeyChecking=no. The second setting "off", is a synonym for the current behaviour of StrictHostKeyChecking=no: accept new host keys, and continue connection for hosts with incorrect hostkeys. A future release will change the meaning of StrictHostKeyChecking=no to the behaviour of "accept-new". bz 2400 ssh 1 : add SyslogFacility option to ssh 1 matching the equivalent option in sshd 8 . bz 2705 Bugfixes -------- ssh 1 : use HostKeyAlias if specified instead of hostname for matching host certificate principal names; bz 2728 sftp 1 : implement sorting for globbed ls; bz 2649 ssh 1 : add a user@host prefix to client's "Permission denied" messages, useful in particular when using "stacked" connections e.g. ssh -J where it's not clear which host is denying. bz 2720 ssh 1 : accept unknown EXT INFO extension values that contain \0 characters. These are legal, but would previously cause fatal connection errors if received. ssh 1 /sshd 8 : repair compression statistics printed at connection exit sftp 1 : print '?' instead of incorrect link count that the protocol doesn't provide for remote listings. bz 2710 ssh 1 : return failure rather than fatal for more cases during session multiplexing negotiations. Causes the session to fall back to a non-mux connection if they occur. bz 2707 ssh 1 : mention that the server may send debug messages to explain public key authentication problems under some circumstances; bz 2709 Translate OpenSSL error codes to better report incorrect passphrase errors when loading private keys; bz 2699 sshd 8 : adjust compatibility patterns for WinSCP to correctly identify versions that implement only the legacy DH group exchange scheme. bz 2748 ssh 1 : print the "Killed by signal 1" message only at LogLevel verbose so that it is not shown at the default level; prevents it from appearing during ssh -J and equivalent ProxyCommand configs. bz 1906, bz 2744 ssh-keygen 1 : when generating all hostkeys ssh-keygen -A , clobber existing keys if they exist but are zero length. zero-length keys could previously be made if ssh-keygen failed or was interrupted part way through generating them. bz 2561 ssh 1 : fix pledge 2 violation in the escape sequence "~&" used to place the current session in the background. ssh-keyscan 1 : avoid double-close on file descriptors; bz 2734 sshd 8 : avoid reliance on shared use of pointers shared between monitor and child sshd processes. bz 2704 sshd config 8 : document available AuthenticationMethods; bz 2453 ssh 1 : avoid truncation in some login prompts; bz 2768 sshd 8 : Fix various compilations failures, inc bz 2767 ssh 1 : make "--" before the hostname terminate argument processing after the hostname too. ssh-keygen 1 : switch from aes256-cbc to aes256-ctr for encrypting new-style private keys. Fixes problems related to private key handling for no-OpenSSL builds. bz 2754 ssh 1 : warn and do not attempt to use keys when the public and private halves do not match. bz 2737 sftp 1 : don't print verbose error message when ssh disconnects from under sftp. bz 2750 sshd 8 : fix keepalive scheduling problem: activity on a forwarded port from preventing the keepalive from being sent; bz 2756 sshd 8 : when started without root privileges, don't require the privilege separation user or path to exist. Makes running the regression tests easier without touching the filesystem. Make integrity.sh regression tests more robust against timeouts. bz 2658 ssh 1 /sshd 8 : correctness fix for channels implementation: accept channel IDs greater than 0x7FFFFFFF. Portability ----------- sshd 9 : drop two more privileges in the Solaris sandbox: PRIV DAX ACCESS and PRIV SYS IB INFO; bz 2723 sshd 8 : expose list of completed authentication methods to PAM via the SSH AUTH INFO 0 PAM environment variable. bz 2408 ssh 1 /sshd 8 : fix several problems in the tun/tap forwarding code, mostly to do with host/network byte order confusion. bz 2735 Add --with-cflags-after and --with-ldflags-after configure flags to allow setting CFLAGS/LDFLAGS after configure has completed. These are useful for setting sanitiser/fuzzing options that may interfere with configure's operation. sshd 8 : avoid Linux seccomp violations on ppc64le over the socketcall syscall. Fix use of ldns when using ldns-config; bz 2697 configure: set cache variables when cross-compiling. The cross- compiling fallback message was saying it assumed the test passed, but it wasn't actually set the cache variables and this would cause later tests to fail. Add clang libFuzzer harnesses for public key parsing and signature verification. Checksums: ========== - SHA1 openssh-7.6.tar.gz = 157fe3989a245c58fcdb34d9fe722a3c4e14c008 - SHA1 openssh-7.6p1.tar.gz = a6984bc2c72192bed015c8b879b35dd9f5350b3b - SHA256 openssh-7.6.tar.gz = Xu3bdpCcu65vM2FnW7b6IKLgd4Kvf2P3WBTMw+I7Bao= - SHA256 openssh-7.6p1.tar.gz = oyPK7t3+FFuqoNsW6Y14Sx+8fdQ2pr8fR539XNHSFyM= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 7.5 was released on 2017-03-20. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future deprecation notice ========================= We plan on retiring more legacy cryptography in future releases, specifically: In the next major release expected June-August , removing remaining support for the SSH v.1 protocol currently client-only and compile- time disabled . In the same release, removing support for Blowfish and RC4 ciphers and the RIPE-MD160 HMAC. These are currently run-time disabled . In the same release, removing the remaining CBC ciphers from being offered by default in the client These have not been offered in sshd by default for several years . Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits This list reflects our current intentions, but please check the final release notes for future releases. Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: This release deprecates the sshd config UsePrivilegeSeparation option, thereby making privilege separation mandatory. Privilege separation has been on by default for almost 15 years and sandboxing has been on by default for almost the last five. The format of several log messages emitted by the packet code has changed to include additional information about the user and their authentication state. Software that monitors ssh/sshd logs may need to account for these changes. For example: Connection closed by user x 1.1.1.1 port 1234 preauth Connection closed by authenticating user x 10.1.1.1 port 1234 preauth Connection closed by invalid user x 1.1.1.1 port 1234 preauth Affected messages include connection closure, timeout, remote disconnection, negotiation failure and some other fatal messages generated by the packet code. Portable OpenSSH only This version removes support for building against OpenSSL versions prior to 1.0.1. OpenSSL stopped supporting versions prior to 1.0.1 over 12 months ago i.e. they no longer receive fixes for security bugs . Changes since OpenSSH 7.4 ========================= This is a bugfix release. Security -------- ssh 1 , sshd 8 : Fix weakness in CBC padding oracle countermeasures that allowed a variant of the attack fixed in OpenSSH 7.3 to proceed. Note that the OpenSSH client disables CBC ciphers by default, sshd offers them as lowest-preference options and will remove them by default entriely in the next release. Reported by Jean Paul Degabriele, Kenny Paterson, Martin Albrecht and Torben Hansen of Royal Holloway, University of London. sftp-client 1 : portable OpenSSH only On Cygwin, a client making a recursive file transfer could be maniuplated by a hostile server to perform a path-traversal attack. creating or modifying files outside of the intended target directory. Reported by Jann Horn of Google Project Zero. New Features ------------ ssh 1 , sshd 8 : Support "=-" syntax to easily remove methods from algorithm lists, e.g. Ciphers=- cbc. bz 2671 Bugfixes -------- sshd 1 : Fix NULL dereference crash when key exchange start messages are sent out of sequence. ssh 1 , sshd 8 : Allow form-feed characters to appear in configuration files. sshd 8 : Fix regression in OpenSSH 7.4 support for the server-sig-algs extension, where SHA2 RSA signature methods were not being correctly advertised. bz 2680 ssh 1 , ssh-keygen 1 : Fix a number of case-sensitivity bugs in known hosts processing. bz 2591 bz 2685 ssh 1 : Allow ssh to use certificates accompanied by a private key file but no corresponding plain .pub public key. bz 2617 ssh 1 : When updating hostkeys using the UpdateHostKeys option, accept RSA keys if HostkeyAlgorithms contains any RSA keytype. Previously, ssh could ignore RSA keys when only the ssh-rsa-sha2- methods were enabled in HostkeyAlgorithms and not the old ssh-rsa method. bz 2650 ssh 1 : Detect and report excessively long configuration file lines. bz 2651 Merge a number of fixes found by Coverity and reported via Redhat and FreeBSD. Includes fixes for some memory and file descriptor leaks in error paths. bz 2687 ssh-keyscan 1 : Correctly hash hosts with a port number. bz 2692 ssh 1 , sshd 8 : When logging long messages to stderr, don't truncate "\r\n" if the length of the message exceeds the buffer. bz 2688 ssh 1 : Fully quote host :port in generated ProxyJump/-J command- line; avoid confusion over IPv6 addresses and shells that treat square bracket characters specially. ssh-keygen 1 : Fix corruption of known hosts when running "ssh-keygen -H" on a known hosts containing already-hashed entries. Fix various fallout and sharp edges caused by removing SSH protocol 1 support from the server, including the server banner string being incorrectly terminated with only \n instead of \r\n , confusing error messages from ssh-keyscan bz 2583 and a segfault in sshd if protocol v.1 was enabled for the client and sshd config contained references to legacy keys bz 2686. ssh 1 , sshd 8 : Free fd set on connection timeout. bz 2683 sshd 8 : Fix Unix domain socket forwarding for root regression in OpenSSH 7.4 . sftp 1 : Fix division by zero crash in "df" output when server returns zero total filesystem blocks/inodes. ssh 1 , ssh-add 1 , ssh-keygen 1 , sshd 8 : Translate OpenSSL errors encountered during key loading to more meaningful error codes. bz 2522 bz 2523 ssh-keygen 1 : Sanitise escape sequences in key comments sent to printf but preserve valid UTF-8 when the locale supports it; bz 2520 ssh 1 , sshd 8 : Return reason for port forwarding failures where feasible rather than always "administratively prohibited". bz 2674 sshd 8 : Fix deadlock when AuthorizedKeysCommand or AuthorizedPrincipalsCommand produces a lot of output and a key is matched early. bz 2655 Regression tests: several reliability fixes. bz 2654 bz 2658 bz 2659 ssh 1 : Fix typo in ~C error message for bad port forward cancellation. bz 2672 ssh 1 : Show a useful error message when included config files can't be opened; bz 2653 sshd 8 : Make sshd set GSSAPIStrictAcceptorCheck=yes as the manual page previously incorrectly advertised. bz 2637 sshd config 5 : Repair accidentally-deleted mention of %k token in AuthorizedKeysCommand; bz 2656 sshd 8 : Remove vestiges of previously removed LOGIN PROGRAM; bz 2665 ssh-agent 1 : Relax PKCS 11 whitelist to include libexec and common 32-bit compatibility library directories. sftp-client 1 : Fix non-exploitable integer overflow in SSH2 FXP NAME response handling. ssh-agent 1 : Fix regression in 7.4 of deleting PKCS 11-hosted keys. It was not possible to delete them except by specifying their full physical path. bz 2682 Portability ----------- sshd 8 : Avoid sandbox errors for Linux S390 systems using an ICA crypto coprocessor. sshd 8 : Fix non-exploitable weakness in seccomp-bpf sandbox arg inspection. ssh 1 : Fix X11 forwarding on OSX where X11 was being started by launchd. bz 2341 ssh-keygen 1 , ssh 1 , sftp 1 : Fix output truncation for various that contain non-printable characters where the codeset in use is ASCII. build: Fix builds that attempt to link a kerberised libldns. bz 2603 build: Fix compilation problems caused by unconditionally defining XOPEN SOURCE in wide character detection. sshd 8 : Fix sandbox violations for clock gettime VSDO syscall fallback on some Linux/X32 kernels. bz 2142 Checksums: ========== - SHA1 openssh-7.5.tar.gz = 81384df377e38551f7659a4c250383d0bbd25341 - SHA1 openssh-7.5p1.tar.gz = 5e8f185d00afb4f4f89801e9b0f8b9cee9d87ebd - SHA256 openssh-7.5.tar.gz = Gmk8jOdGdKa7NixUN5J+bTMfeum5Vx8Nv+leAdQNq3U= - SHA256 openssh-7.5p1.tar.gz = mEbjxfq58FR0ALTSwBeZL5FCIrP9H47ubH3GvF5Z+fA= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 7.4 was released on 2016-12-19. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future deprecation notice ========================= We plan on retiring more legacy cryptography in future releases, specifically: In approximately August 2017, removing remaining support for the SSH v.1 protocol client-only and currently compile-time disabled . In the same release, removing support for Blowfish and RC4 ciphers and the RIPE-MD160 HMAC. These are currently run-time disabled . Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits The next release of OpenSSH will remove support for running sshd 8 with privilege separation disabled. The next release of portable OpenSSH will remove support for OpenSSL version prior to 1.0.1. This list reflects our current intentions, but please check the final release notes for future releases. Potentially-incompatible changes ================================ This release includes a number of changes that may affect existing configurations: This release removes server support for the SSH v.1 protocol. ssh 1 : Remove 3des-cbc from the client's default proposal. 64-bit block ciphers are not safe in 2016 and we don't want to wait until attacks like SWEET32 are extended to SSH. As 3des-cbc was the only mandatory cipher in the SSH RFCs, this may cause problems connecting to older devices using the default configuration, but it's highly likely that such devices already need explicit configuration for key exchange and hostkey algorithms already anyway. sshd 8 : Remove support for pre-authentication compression. Doing compression early in the protocol probably seemed reasonable in the 1990s, but today it's clearly a bad idea in terms of both cryptography cf. multiple compression oracle attacks in TLS and attack surface. Pre-auth compression support has been disabled by default for 10 years. Support remains in the client. ssh-agent will refuse to load PKCS 11 modules outside a whitelist of trusted paths by default. The path whitelist may be specified at run-time. sshd 8 : When a forced-command appears in both a certificate and an authorized keys/principals command= restriction, sshd will now refuse to accept the certificate unless they are identical. The previous documented behaviour of having the certificate forced-command override the other could be a bit confusing and error-prone. sshd 8 : Remove the UseLogin configuration directive and support for having /bin/login manage login sessions. Changes since OpenSSH 7.3 ========================= This is primarily a bugfix release. Security -------- ssh-agent 1 : Will now refuse to load PKCS 11 modules from paths outside a trusted whitelist run-time configurable . Requests to load modules could be passed via agent forwarding and an attacker could attempt to load a hostile PKCS 11 module across the forwarded agent channel: PKCS 11 modules are shared libraries, so this would result in code execution on the system running the ssh-agent if the attacker has control of the forwarded agent-socket on the host running the sshd server and the ability to write to the filesystem of the host running ssh-agent usually the host running the ssh client . Reported by Jann Horn of Project Zero. sshd 8 : When privilege separation is disabled, forwarded Unix- domain sockets would be created by sshd 8 with the privileges of 'root' instead of the authenticated user. This release refuses Unix-domain socket forwarding when privilege separation is disabled Privilege separation has been enabled by default for 14 years . Reported by Jann Horn of Project Zero. sshd 8 : Avoid theoretical leak of host private key material to privilege-separated child processes via realloc when reading keys. No such leak was observed in practice for normal-sized keys, nor does a leak to the child processes directly expose key material to unprivileged users. Reported by Jann Horn of Project Zero. sshd 8 : The shared memory manager used by pre-authentication compression support had a bounds checks that could be elided by some optimising compilers. Additionally, this memory manager was incorrectly accessible when pre-authentication compression was disabled. This could potentially allow attacks against the privileged monitor process from the sandboxed privilege-separation process a compromise of the latter would be required first . This release removes support for pre-authentication compression from sshd 8 . Reported by Guido Vranken using the Stack unstable optimisation identification tool http://css.csail.mit.edu/stack/ sshd 8 : Fix denial-of-service condition where an attacker who sends multiple KEXINIT messages may consume up to 128MB per connection. Reported by Shi Lei of Gear Team, Qihoo 360. sshd 8 : Validate address ranges for AllowUser and DenyUsers directives at configuration load time and refuse to accept invalid ones. It was previously possible to specify invalid CIDR address ranges e.g. user@127.1.2.3/55 and these would always match, possibly resulting in granting access where it was not intended. Reported by Laurence Parry. New Features ------------ ssh 1 : Add a proxy multiplexing mode to ssh 1 inspired by the version in PuTTY by Simon Tatham. This allows a multiplexing client to communicate with the master process using a subset of the SSH packet and channels protocol over a Unix-domain socket, with the main process acting as a proxy that translates channel IDs, etc. This allows multiplexing mode to run on systems that lack file- descriptor passing used by current multiplexing code and potentially, in conjunction with Unix-domain socket forwarding, with the client and multiplexing master process on different machines. Multiplexing proxy mode may be invoked using "ssh -O proxy ..." sshd 8 : Add a sshd config DisableForwarding option that disables X11, agent, TCP, tunnel and Unix domain socket forwarding, as well as anything else we might implement in the future. Like the 'restrict' authorized keys flag, this is intended to be a simple and future-proof way of restricting an account. sshd 8 , ssh 1 : Support the "curve25519-sha256" key exchange method. This is identical to the currently-supported method named "curve25519-sha256@libssh.org". sshd 8 : Improve handling of SIGHUP by checking to see if sshd is already daemonised at startup and skipping the call to daemon 3 if it is. This ensures that a SIGHUP restart of sshd 8 will retain the same process-ID as the initial execution. sshd 8 will also now unlink the PidFile prior to SIGHUP restart and re-create it after a successful restart, rather than leaving a stale file in the case of a configuration error. bz 2641 sshd 8 : Allow ClientAliveInterval and ClientAliveCountMax directives to appear in sshd config Match blocks. sshd 8 : Add %-escapes to AuthorizedPrincipalsCommand to match those supported by AuthorizedKeysCommand key, key type, fingerprint, etc. and a few more to provide access to the contents of the certificate being offered. Added regression tests for string matching, address matching and string sanitisation functions. Improved the key exchange fuzzer harness. Bugfixes -------- ssh 1 : Allow IdentityFile to successfully load and use certificates that have no corresponding bare public key. bz 2617 certificate id rsa-cert.pub and no id rsa.pub . ssh 1 : Fix public key authentication when multiple authentication is in use and publickey is not just the first method attempted. bz 2642 regress: Allow the PuTTY interop tests to run unattended. bz 2639 ssh-agent 1 , ssh 1 : improve reporting when attempting to load keys from PKCS 11 tokens with fewer useless log messages and more detail in debug messages. bz 2610 ssh 1 : When tearing down ControlMaster connections, don't pollute stderr when LogLevel=quiet. sftp 1 : On ^Z wait for underlying ssh 1 to suspend before suspending sftp 1 to ensure that ssh 1 restores the terminal mode correctly if suspended during a password prompt. ssh 1 : Avoid busy-wait when ssh 1 is suspended during a password prompt. ssh 1 , sshd 8 : Correctly report errors during sending of ext- info messages. sshd 8 : fix NULL-deref crash if sshd 8 received an out-of- sequence NEWKEYS message. sshd 8 : Correct list of supported signature algorithms sent in the server-sig-algs extension. bz 2547 sshd 8 : Fix sending ext info message if privsep is disabled. sshd 8 : more strictly enforce the expected ordering of privilege separation monitor calls used for authentication and allow them only when their respective authentication methods are enabled in the configuration sshd 8 : Fix uninitialised optlen in getsockopt call; harmless on Unix/BSD but potentially crashy on Cygwin. Fix false positive reports caused by explicit bzero 3 not being recognised as a memory initialiser when compiled with -fsanitize-memory. sshd config 5 : Use 2001:db8::/32, the official IPv6 subnet for configuration examples. Portability ----------- On environments configured with Turkish locales, fall back to the C/POSIX locale to avoid errors in configuration parsing caused by that locale's unique handling of the letters 'i' and 'I'. bz 2643 sftp-server 8 , ssh-agent 1 : Deny ptrace on OS X using ptrace PT DENY ATTACH, .. ssh 1 , sshd 8 : Unbreak AES-CTR ciphers on old ~0.9.8 OpenSSL. Fix compilation for libcrypto compiled without RIPEMD160 support. contrib: Add a gnome-ssh-askpass3 with GTK+3 support. bz 2640 sshd 8 : Improve PRNG reseeding across privilege separation and force libcrypto to obtain a high-quality seed before chroot or sandboxing. All: Explicitly test for broken strnvis. NetBSD added an strnvis and unfortunately made it incompatible with the existing one in OpenBSD and Linux's libbsd the former having existed for over ten years . Try to detect this mess, and assume the only safe option if we're cross compiling. Checksums: ========== - SHA1 openssh-7.4.tar.gz = 1e2073f95d5ead8f2814b4b6c0700bcd533c410f - SHA1 openssh-7.4p1.tar.gz = 2330bbf82ed08cf3ac70e0acf00186ef3eeb97e0 - SHA256 openssh-7.4.tar.gz = +GEXh7Xr2J87cq1uA97hF9e+3lfOQ2LKxXGdmFXREf0 - SHA256 openssh-7.4p1.tar.gz = Gx/EoU4gJCkxgZJO0khy5vLgYpPz6JJqN2uK7EgfGdE= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 7.3 was released on 2016-08-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future deprecation notice ========================= We plan on retiring more legacy cryptography in a near-future release, specifically: Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits Removing server-side support for the SSH v.1 protocol currently compile-time disabled . In approximately 1 year, removing all support for the SSH v.1 protocol currently compile-time disabled . This list reflects our current intentions, but please check the final release notes for future releases. Changes since OpenSSH 7.2 ========================= This is primarily a bugfix release. Security -------- sshd 8 : Mitigate a potential denial-of-service attack against the system's crypt 3 function via sshd 8 . An attacker could send very long passwords that would cause excessive CPU use in crypt 3 . sshd 8 now refuses to accept password authentication requests of length greater than 1024 characters. Independently reported by Tomas Kuthan Oracle , Andres Rojas and Javier Nieto. sshd 8 : Mitigate timing differences in password authentication that could be used to discern valid from invalid account names when long passwords were sent and particular password hashing algorithms are in use on the server. CVE-2016-6210, reported by EddieEzra.Harari at verint.com ssh 1 , sshd 8 : Fix observable timing weakness in the CBC padding oracle countermeasures. Reported by Jean Paul Degabriele, Kenny Paterson, Torben Hansen and Martin Albrecht. Note that CBC ciphers are disabled by default and only included for legacy compatibility. ssh 1 , sshd 8 : Improve operation ordering of MAC verification for Encrypt-then-MAC EtM mode transport MAC algorithms to verify the MAC before decrypting any ciphertext. This removes the possibility of timing differences leaking facts about the plaintext, though no such leakage has been observed. Reported by Jean Paul Degabriele, Kenny Paterson, Torben Hansen and Martin Albrecht. sshd 8 : portable only Ignore PAM environment vars when UseLogin=yes. If PAM is configured to read user-specified environment variables and UseLogin=yes in sshd config, then a hostile local user may attack /bin/login via LD PRELOAD or similar environment variables set via PAM. CVE-2015-8325, found by Shayan Sadigh. New Features ------------ ssh 1 : Add a ProxyJump option and corresponding -J command-line flag to allow simplified indirection through a one or more SSH bastions or "jump hosts". ssh 1 : Add an IdentityAgent option to allow specifying specific agent sockets instead of accepting one from the environment. ssh 1 : Allow ExitOnForwardFailure and ClearAllForwardings to be optionally overridden when using ssh -W. bz 2577 ssh 1 , sshd 8 : Implement support for the IUTF8 terminal mode as per draft-sgtatham-secsh-iutf8-00. ssh 1 , sshd 8 : Add support for additional fixed Diffie-Hellman 2K, 4K and 8K groups from draft-ietf-curdle-ssh-kex-sha2-03. ssh-keygen 1 , ssh 1 , sshd 8 : support SHA256 and SHA512 RSA signatures in certificates; ssh 1 : Add an Include directive for ssh config 5 files. ssh 1 : Permit UTF-8 characters in pre-authentication banners sent from the server. bz 2058 Bugfixes -------- ssh 1 , sshd 8 : Reduce the syslog level of some relatively common protocol events from LOG CRIT. bz 2585 sshd 8 : Refuse AuthenticationMethods="" in configurations and accept AuthenticationMethods=any for the default behaviour of not requiring multiple authentication. bz 2398 sshd 8 : Remove obsolete and misleading "POSSIBLE BREAK-IN ATTEMPT " message when forward and reverse DNS don't match. bz 2585 ssh 1 : Close ControlPersist background process stderr except in debug mode or when logging to syslog. bz 1988 misc: Make PROTOCOL description for direct-streamlocal@openssh.com channel open messages match deployed code. bz 2529 ssh 1 : Deduplicate LocalForward and RemoteForward entries to fix failures when both ExitOnForwardFailure and hostname canonicalisation are enabled. bz 2562 sshd 8 : Remove fallback from moduli to obsolete "primes" file that was deprecated in 2001. bz 2559. sshd config 5 : Correct description of UseDNS: it affects ssh hostname processing for authorized keys, not known hosts; bz 2554 ssh 1 : Fix authentication using lone certificate keys in an agent without corresponding private keys on the filesystem. bz 2550 sshd 8 : Send ClientAliveInterval pings when a time-based RekeyLimit is set; previously keepalive packets were not being sent. bz 2252 Portability ----------- ssh 1 , sshd 8 : Fix compilation by automatically disabling ciphers not supported by OpenSSL. bz 2466 misc: Fix compilation failures on some versions of AIX's compiler related to the definition of the VA COPY macro. bz 2589 sshd 8 : Whitelist more architectures to enable the seccomp-bpf sandbox. bz 2590 ssh-agent 1 , sftp-server 8 : Disable process tracing on Solaris using setpflags PROC PROTECT, ... . bz 2584 sshd 8 : On Solaris, don't call Solaris setproject with UsePAM=yes it's PAM's responsibility. bz 2425 Checksums: ========== - SHA1 openssh-7.3.tar.gz = b1641e5265d9ec68a9a19decc3a7edd1203cbd33 - SHA256 openssh-7.3.tar.gz = vS0X35qrX9OOPBkyDMYhOje/DBwHBVEV7nv5rkzw4vM= - SHA1 openssh-7.3p1.tar.gz = bfade84283fcba885e2084343ab19a08c7d123a5 - SHA256 openssh-7.3p1.tar.gz = P/uYmm3KppWUw7VQ1IVaWi4XGMzd5/XjY4e0JCIPvsw= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Portable OpenSSH 7.2p2 was released on 2016-03-10. It will be available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 7.2p1 =========================== This release fixes a security bug: sshd 8 : sanitise X11 authentication credentials to avoid xauth command injection when X11Forwarding is enabled. Full details of the vulnerability are available at: http://www.openssh.com/txt/x11fwd.adv Checksums: ========== - SHA1 openssh-7.2p2.tar.gz = 70e35d7d6386fe08abbd823b3a12a3ca44ac6d38 - SHA256 openssh-7.2p2.tar.gz = pyeB0aBDh2oiT/GwAy2qQJTYdWWmhSh1nBwsq1SCVIw= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 7.2 was released on 2016-02-29. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future deprecation notice ========================= We plan on retiring more legacy cryptography in a near-future release, specifically: Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits This list reflects our current intentions, but please check the final release notes for future releases. Potentially-incompatible changes ================================ This release disables a number of legacy cryptographic algorithms by default in ssh: Several ciphers blowfish-cbc, cast128-cbc, all arcfour variants and the rijndael-cbc aliases for AES. MD5-based and truncated HMAC algorithms. These algorithms are already disabled by default in sshd. Changes since OpenSSH 7.1p2 =========================== This is primarily a bugfix release. Security -------- ssh 1 , sshd 8 : remove unfinished and unused roaming code was already forcibly disabled in OpenSSH 7.1p2 . ssh 1 : eliminate fallback from untrusted X11 forwarding to trusted forwarding when the X server disables the SECURITY extension. ssh 1 , sshd 8 : increase the minimum modulus size supported for diffie-hellman-group-exchange to 2048 bits. sshd 8 : pre-auth sandboxing is now enabled by default previous releases enabled it for new installations via sshd config . New Features ------------ all: add support for RSA signatures using SHA-256/512 hash algorithms based on draft-rsa-dsa-sha2-256-03.txt and draft-ssh-ext-info-04.txt. ssh 1 : Add an AddKeysToAgent client option which can be set to 'yes', 'no', 'ask', or 'confirm', and defaults to 'no'. When enabled, a private key that is used during authentication will be added to ssh-agent if it is running with confirmation enabled if set to 'confirm' . sshd 8 : add a new authorized keys option "restrict" that includes all current and future key restrictions no- -forwarding, etc. . Also add permissive versions of the existing restrictions, e.g. "no-pty" - "pty". This simplifies the task of setting up restricted keys and ensures they are maximally-restricted, regardless of any permissions we might implement in the future. ssh 1 : add ssh config CertificateFile option to explicitly list certificates. bz 2436 ssh-keygen 1 : allow ssh-keygen to change the key comment for all supported formats. ssh-keygen 1 : allow fingerprinting from standard input, e.g. "ssh-keygen -lf -" ssh-keygen 1 : allow fingerprinting multiple public keys in a file, e.g. "ssh-keygen -lf ~/.ssh/authorized keys" bz 1319 sshd 8 : support "none" as an argument for sshd config Foreground and ChrootDirectory. Useful inside Match blocks to override a global default. bz 2486 ssh-keygen 1 : support multiple certificates one per line and reading from standard input using "-f -" for "ssh-keygen -L" ssh-keyscan 1 : add "ssh-keyscan -c ..." flag to allow fetching certificates instead of plain keys. ssh 1 : better handle anchored FQDNs e.g. 'cvs.openbsd.org.' in hostname canonicalisation - treat them as already canonical and remove the trailing '.' before matching ssh config. Bugfixes -------- sftp 1 : existing destination directories should not terminate recursive uploads regression in openssh 6.8 bz 2528 ssh 1 , sshd 8 : correctly send back SSH2 MSG UNIMPLEMENTED replies to unexpected messages during key exchange. bz 2949 ssh 1 : refuse attempts to set ConnectionAttempts=0, which does not make sense and would cause ssh to print an uninitialised stack variable. bz 2500 ssh 1 : fix errors when attempting to connect to scoped IPv6 addresses with hostname canonicalisation enabled. sshd config 5 : list a couple more options usable in Match blocks. bz 2489 sshd 8 : fix "PubkeyAcceptedKeyTypes +..." inside a Match block. ssh 1 : expand tilde characters in filenames passed to -i options before checking whether or not the identity file exists. Avoids confusion for cases where shell doesn't expand e.g. "-i ~/file" vs. "-i~/file" . bz 2481 ssh 1 : do not prepend "exec" to the shell command run by "Match exec" in a config file, which could cause some commands to fail in certain environments. bz 2471 ssh-keyscan 1 : fix output for multiple hosts/addrs on one line when host hashing or a non standard port is in use bz 2479 sshd 8 : skip "Could not chdir to home directory" message when ChrootDirectory is active. bz 2485 ssh 1 : include PubkeyAcceptedKeyTypes in ssh -G config dump. sshd 8 : avoid changing TunnelForwarding device flags if they are already what is needed; makes it possible to use tun/tap networking as non-root user if device permissions and interface flags are pre-established ssh 1 , sshd 8 : RekeyLimits could be exceeded by one packet. bz 2521 ssh 1 : fix multiplexing master failure to notice client exit. ssh 1 , ssh-agent 1 : avoid fatal for PKCS11 tokens that present empty key IDs. bz 1773 sshd 8 : avoid printf of NULL argument. bz 2535 ssh 1 , sshd 8 : allow RekeyLimits larger than 4GB. bz 2521 ssh-keygen 1 : sshd 8 : fix several bugs in unused KRL signature support. ssh 1 , sshd 8 : fix connections with peers that use the key exchange guess feature of the protocol. bz 2515 sshd 8 : include remote port number in log messages. bz 2503 ssh 1 : don't try to load SSHv1 private key when compiled without SSHv1 support. bz 2505 ssh-agent 1 , ssh 1 : fix incorrect error messages during key loading and signing errors. bz 2507 ssh-keygen 1 : don't leave empty temporary files when performing known hosts file edits when known hosts doesn't exist. sshd 8 : correct packet format for tcpip-forward replies for requests that don't allocate a port bz 2509 ssh 1 , sshd 8 : fix possible hang on closed output. bz 2469 ssh 1 : expand %i in ControlPath to UID. bz 2449 ssh 1 , sshd 8 : fix return type of openssh RSA verify. bz 2460 ssh 1 , sshd 8 : fix some option parsing memory leaks. bz 2182 ssh 1 : add a some debug output before DNS resolution; it's a place where ssh could previously silently stall in cases of unresponsive DNS servers. bz 2433 ssh 1 : remove spurious newline in visual hostkey. bz 2686 ssh 1 : fix printing ssh -G ... of HostKeyAlgorithms=+... ssh 1 : fix expansion of HostkeyAlgorithms=+... Documentation ------------- ssh config 5 , sshd config 5 : update default algorithm lists to match current reality. bz 2527 ssh 1 : mention -Q key-plain and -Q key-cert query options. bz 2455 sshd config 8 : more clearly describe what AuthorizedKeysFile=none does. ssh config 5 : better document ExitOnForwardFailure. bz 2444 sshd 5 : mention internal DH-GEX fallback groups in manual. bz 2302 sshd config 5 : better description for MaxSessions option. bz 2531 Portability ----------- ssh 1 , sftp-server 8 , ssh-agent 1 , sshd 8 : Support Illumos/ Solaris fine-grained privileges. Including a pre-auth privsep sandbox and several pledge emulations. bz 2511 Renovate redhat/openssh.spec, removing deprecated options and syntax. configure: allow --without-ssl-engine with --without-openssl sshd 8 : fix multiple authentication using S/Key. bz 2502 sshd 8 : read back from libcrypto RAND before dropping privileges. Avoids sandboxing violations with BoringSSL. Fix name collision with system-provided glob 3 functions. bz 2463 Adapt Makefile to use ssh-keygen -A when generating host keys. bz 2459 configure: correct default value for --with-ssh1 bz 2457 configure: better detection of res symbol bz 2259 support getrandom syscall on Linux Checksums: ========== - SHA1 openssh-7.2.tar.gz = 9567d00fffe655010c087aeb80c830cecbbecca6 - SHA256 openssh-7.2.tar.gz = 99GsHA8NwSGuEJhMc7hAOQ510y1xfGx27uJqyw73sCI= - SHA1 openssh-7.2p1.tar.gz = d30a6fd472199ab5838a7668c0c5fd885fb8d371 - SHA256 openssh-7.2p1.tar.gz = lzzDey81l+TPWZsJ5gTnnA/l2bb1laJOke0GYoYLSsM= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 7.1p2 was released on 2016-01-14. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 7.1p1 =========================== SECURITY: ssh 1 : The OpenSSH client code between 5.4 and 7.1 contains experimental support for resuming SSH-connections roaming . The matching server code has never been shipped, but the client code was enabled by default and could be tricked by a malicious server into leaking client memory to the server, including private client user keys. The authentication of the server host key prevents exploitation by a man-in-the-middle, so this information leak is restricted to connections to malicious or compromised servers. MITIGATION: For OpenSSH = 5.4 the vulnerable code in the client can be completely disabled by adding 'UseRoaming no' to the gobal ssh config 5 file, or to user configuration in ~/.ssh/config, or by passing -oUseRoaming=no on the command line. PATCH: See below for a patch to disable this feature Disabling Roaming in the Source Code . This problem was reported by the Qualys Security Advisory team. SECURITY: Fix an out of-bound read access in the packet handling code. Reported by Ben Hawkes. PROTOCOL: Correctly interpret the 'first kex follows' option during the intial key exchange. Reported by Matt Johnston. Further use of explicit bzero has been added in various buffer handling code paths to guard against compilers aggressively doing dead-store removal. Checksums: ========== - SHA1 openssh-7.1p2.tar.gz = 9202f5a2a50c8a55ecfb830609df1e1fde97f758 - SHA256 openssh-7.1p2.tar.gz = dd75f024dcf21e06a0d6421d582690bf987a1f6323e32ad6619392f3bfde6bbd Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Disabling Roaming in the Source Code: ===================================== --- readconf.c 30 Jul 2015 00:01:34 -0000 1.239 +++ readconf.c 13 Jan 2016 23:17:23 -0000 @@ -1648,7 +1648,7 @@ initialize options Options options options- tun remote = -1; options- local command = NULL; options- permit local command = -1; - options- use roaming = -1; + options- use roaming = 0; options- visual host key = -1; options- ip qos interactive = -1; options- ip qos bulk = -1; @@ -1819,8 +1819,7 @@ fill default options Options options options- tun remote = SSH TUNID ANY; if options- permit local command == -1 options- permit local command = 0; - if options- use roaming == -1 - options- use roaming = 1; + options- use roaming = 0; if options- visual host key == -1 options- visual host key = 0; if options- ip qos interactive == -1 --- ssh.c 30 Jul 2015 00:01:34 -0000 1.420 +++ ssh.c 13 Jan 2016 23:17:23 -0000 @@ -1882,9 +1882,6 @@ ssh session2 void fork postauth ; } - if options.use roaming - request roaming ; - return client loop tty flag, tty flag ? options.escape char : SSH ESCAPECHAR NONE, id ; } OpenSSH 7.1 was released on 2015-08-21. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future deprecation notice ========================= We plan on retiring more legacy cryptography in the next release including: Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits Several ciphers will be disabled by default: blowfish-cbc, cast128-cbc, all arcfour variants and the rijndael-cbc aliases for AES. MD5-based HMAC algorithms will be disabled by default. This list reflects our current intentions, but please check the final release notes for OpenSSH 7.2 when it is released. Changes since OpenSSH 7.0 ========================= This is a bugfix release. Security -------- sshd 8 : OpenSSH 7.0 contained a logic error in PermitRootLogin= prohibit-password/without-password that could, depending on compile-time configuration, permit password authentication to root while preventing other forms of authentication. This problem was reported by Mantas Mikulenas. Bugfixes -------- ssh 1 , sshd 8 : add compatibility workarounds for FuTTY ssh 1 , sshd 8 : refine compatibility workarounds for WinSCP Fix a number of memory faults double-free, free of uninitialised memory, etc in ssh 1 and ssh-keygen 1 . Reported by Mateusz Kocielski. Checksums: ========== - SHA1 openssh-7.1.tar.gz = 06c1db39f33831fe004726e013b2cf84f1889042 - SHA256 openssh-7.1.tar.gz = H7U1se9EoBmhkKi2i7lqpMX9QHdDTsgpu7kd5VZUGSY= - SHA1 openssh-7.1p1.tar.gz = ed22af19f962262c493fcc6ed8c8826b2761d9b6 - SHA256 openssh-7.1p1.tar.gz = /AptLR0GPVxm3/2VJJPQzaJWytIE9oHeD4TvhbKthCg= Please note that the SHA256 signatures are base64 encoded and not hexadecimal which is the default for most checksum tools . The PGP key used to sign the releases is available as RELEASE KEY.asc from the mirror sites. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 7.0 was released on 2015-08-11. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. OpenSSH also includes transitional support for the legacy SSH 1.3 and 1.5 protocols that may be enabled at compile-time. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future deprecation notice ========================= We plan on retiring more legacy cryptography in the next release including: Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits Several ciphers will be disabled by default: blowfish-cbc, cast128-cbc, all arcfour variants and the rijndael-cbc aliases for AES. MD5-based HMAC algorithms will be disabled by default. This list reflects our current intentions, but please check the final release notes for OpenSSH 7.1 when it is released. Changes since OpenSSH 6.9 ========================= This focus of this release is primarily to deprecate weak, legacy and/or unsafe cryptography. Security -------- sshd 8 : OpenSSH 6.8 and 6.9 incorrectly set TTYs to be world- writable. Local attackers may be able to write arbitrary messages to logged-in users, including terminal escape sequences. Reported by Nikolay Edigaryev. sshd 8 : Portable OpenSSH only: Fixed a privilege separation weakness related to PAM support. Attackers who could successfully compromise the pre-authentication process for remote code execution and who had valid credentials on the host could impersonate other users. Reported by Moritz Jodeit. sshd 8 : Portable OpenSSH only: Fixed a use-after-free bug related to PAM support that was reachable by attackers who could compromise the pre-authentication process for remote code execution. Also reported by Moritz Jodeit. sshd 8 : fix circumvention of MaxAuthTries using keyboard- interactive authentication. By specifying a long, repeating keyboard-interactive "devices" string, an attacker could request the same authentication method be tried thousands of times in a single pass. The LoginGraceTime timeout in sshd 8 and any authentication failure delays implemented by the authentication mechanism itself were still applied. Found by Kingcope. Potentially-incompatible Changes -------------------------------- Support for the legacy SSH version 1 protocol is disabled by default at compile time. Support for the 1024-bit diffie-hellman-group1-sha1 key exchange is disabled by default at run-time. It may be re-enabled using the instructions at http://www.openssh.com/legacy.html Support for ssh-dss, ssh-dss-cert- host and user keys is disabled by default at run-time. These may be re-enabled using the instructions at http://www.openssh.com/legacy.html Support for the legacy v00 cert format has been removed. The default for the sshd config 5 PermitRootLogin option has changed from "yes" to "prohibit-password". PermitRootLogin=without-password/prohibit-password now bans all interactive authentication methods, allowing only public-key, hostbased and GSSAPI authentication previously it permitted keyboard-interactive and password-less authentication if those were enabled . New Features ------------ ssh config 5 : add PubkeyAcceptedKeyTypes option to control which public key types are available for user authentication. sshd config 5 : add HostKeyAlgorithms option to control which public key types are offered for host authentications. ssh 1 , sshd 8 : extend Ciphers, MACs, KexAlgorithms, HostKeyAlgorithms, PubkeyAcceptedKeyTypes and HostbasedKeyTypes options to allow appending to the default set of algorithms instead of replacing it. Options may now be prefixed with a '+' to append to the default, e.g. "HostKeyAlgorithms=+ssh-dss". sshd config 5 : PermitRootLogin now accepts an argument of 'prohibit-password' as a less-ambiguous synonym of 'without- password'. Bugfixes -------- ssh 1 , sshd 8 : add compatability workarounds for Cisco and more PuTTY versions. bz 2424 Fix some omissions and errors in the PROTOCOL and PROTOCOL.mux documentation relating to Unix domain socket forwarding; bz 2421 bz 2422 ssh 1 : Improve the ssh 1 manual page to include a better description of Unix domain socket forwarding; bz 2423 ssh 1 , ssh-agent 1 : skip uninitialised PKCS 11 slots, fixing failures to load keys when they are present. bz 2427 ssh 1 , ssh-agent 1 : do not ignore PKCS 11 hosted keys that wth empty CKA ID; bz 2429 sshd 8 : clarify documentation for UseDNS option; bz 2045 Portable OpenSSH ---------------- Check realpath 3 behaviour matches what sftp-server requires and use a replacement if necessary. Checksums: ========== - SHA1 openssh-7.0.tar.gz = a19ff0bad2a67348b1d01a38a9580236120b7099 - SHA256 openssh-7.0.tar.gz = 4F6HV/ZqT465f3sMB2vIkXO+wrYtL5hnqzAymfbZ1Jk= - SHA1 openssh-7.0p1.tar.gz = d8337c9eab91d360d104f6dd805f8b32089c063c - SHA256 openssh-7.0p1.tar.gz = /VkySToZ9MgRU9gS7k4EK0m707dZqz2TRKvswrwUheU= Please note that the PGP key used to sign releases was recently rotated. The new key has been signed by the old key to provide continuity. It is available from the mirror sites as RELEASE KEY.asc. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 6.9 was released on 2015-07-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Future Deprecation Notice ========================= The 7.0 release of OpenSSH, due for release in late July, will deprecate several features, some of which may affect compatibility or existing configurations. The intended changes are as follows: The default for the sshd config 5 PermitRootLogin option will change from "yes" to "no". Support for the legacy version 1.x of the SSH protocol will be disabled at compile time by default. Support for the 1024-bit diffie-hellman-group1-sha1 key exchange will be run-time disabled by default. Support for ssh-dss, ssh-dss-cert- host and user keys will be run-time disabled by default. Support for the legacy v00 cert format will be removed Several ciphers will be disabled by default: blowfish-cbc, cast128-cbc, all arcfour variants and the rijndael-cbc aliases for AES Refusing all RSA keys smaller than 1024 bits the current minimum is 768 bits This list reflects our current intentions, but please check the final release notes for OpenSSH 7.0 when it is released. Changes since OpenSSH 6.8 ========================= This is primarily a bugfix release. Security -------- ssh 1 : when forwarding X11 connections with ForwardX11Trusted=no, connections made after ForwardX11Timeout expired could be permitted and no longer subject to XSECURITY restrictions because of an ineffective timeout check in ssh 1 coupled with "fail open" behaviour in the X11 server when clients attempted connections with expired credentials. This problem was reported by Jann Horn. ssh-agent 1 : fix weakness of agent locking ssh-add -x to password guessing by implementing an increasing failure delay, storing a salted hash of the password rather than the password itself and using a timing-safe comparison function for verifying unlock attempts. This problem was reported by Ryan Castellucci. New Features ------------ ssh 1 , sshd 8 : promote chacha20-poly1305@openssh.com to be the default cipher sshd 8 : support admin-specified arguments to AuthorizedKeysCommand; bz 2081 sshd 8 : add AuthorizedPrincipalsCommand that allows retrieving authorized principals information from a subprocess rather than a file. ssh 1 , ssh-add 1 : support PKCS 11 devices with external PIN entry devices bz 2240 sshd 8 : allow GSSAPI host credential check to be relaxed for multihomed hosts via GSSAPIStrictAcceptorCheck option; bz 928 ssh-keygen 1 : support "ssh-keygen -lF hostname" to search known hosts and print key hashes rather than full keys. ssh-agent 1 : add -D flag to leave ssh-agent in foreground without enabling debug mode; bz 2381 Bugfixes -------- ssh 1 , sshd 8 : deprecate legacy SSH2 MSG KEX DH GEX REQUEST OLD message and do not try to use it against some 3rd-party SSH implementations that use it older PuTTY, WinSCP . Many fixes for problems caused by compile-time deactivation of SSH1 support including bz 2369 ssh 1 , sshd 8 : cap DH-GEX group size at 4Kbits for Cisco implementations as some would fail when attempting to use group sizes 4K; bz 2209 ssh 1 : fix out-of-bound read in EscapeChar configuration option parsing; bz 2396 sshd 8 : fix application of PermitTunnel, LoginGraceTime, AuthenticationMethods and StreamLocalBindMask options in Match blocks ssh 1 , sshd 8 : improve disconnection message on TCP reset; bz 2257 ssh 1 : remove failed remote forwards established by muliplexing from the list of active forwards; bz 2363 sshd 8 : make parsing of authorized keys "environment=" options independent of PermitUserEnv being enabled; bz 2329 sshd 8 : fix post-auth crash with permitopen=none; bz 2355 ssh 1 , ssh-add 1 , ssh-keygen 1 : allow new-format private keys to be encrypted with AEAD ciphers; bz 2366 ssh 1 : allow ListenAddress, Port and AddressFamily configuration options to appear in any order; bz 86 sshd 8 : check for and reject missing arguments for VersionAddendum and ForceCommand; bz 2281 ssh 1 , sshd 8 : don't treat unknown certificate extensions as fatal; bz 2387 ssh-keygen 1 : make stdout and stderr output consistent; bz 2325 ssh 1 : mention missing DISPLAY environment in debug log when X11 forwarding requested; bz 1682 sshd 8 : correctly record login when UseLogin is set; bz 378 sshd 8 : Add some missing options to sshd -T output and fix output of VersionAddendum and HostCertificate. bz 2346 Document and improve consistency of options that accept a "none" argument" TrustedUserCAKeys, RevokedKeys bz 2382 , AuthorizedPrincipalsFile bz 2288 ssh 1 : include remote username in debug output; bz 2368 sshd 8 : avoid compatibility problem with some versions of Tera Term, which would crash when they received the hostkeys notification message hostkeys-00@openssh.com sshd 8 : mention ssh-keygen -E as useful when comparing legacy MD5 host key fingerprints; bz 2332 ssh 1 : clarify pseudo-terminal request behaviour and use make manual language consistent; bz 1716 ssh 1 : document that the TERM environment variable is not subject to SendEnv and AcceptEnv; bz 2386 Portable OpenSSH ---------------- sshd 8 : Format UsePAM setting when using sshd -T, part of bz 2346 Look for '${host}-ar' before 'ar', making cross-compilation easier; bz 2352. Several portable compilation fixes: bz 2402, bz 2337, bz 2370 moduli 5 : update DH-GEX moduli Checksums: ========== - SHA1 openssh-6.9.tar.gz = cd5fcb93411025bbc4b4b57753b622769dfb1e0d - SHA256 openssh-6.9.tar.gz = itCMw0aE/xvrGKWhzRD2UM/9kzIOyFaH2dIWMfX8agQ= - SHA1 openssh-6.9p1.tar.gz = 86ab57f00d0fd9bf302760f2f6deac1b6e9df265 - SHA256 openssh-6.9p1.tar.gz = bgdN9TjzV9RAvmz5PcWBoh8i054jbyF/zY6su2yJbP4= Please note that the PGP key used to sign releases was recently rotated. The new key has been signed by the old key to provide continuity. It is available from the mirror sites as RELEASE KEY.asc. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 6.8 was released on 2015-03-18. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 6.7 ========================= This is a major release, containing a number of new features as well as a large internal re-factoring. Potentially-incompatible changes -------------------------------- sshd 8 : UseDNS now defaults to 'no'. Configurations that match against the client host name via sshd config or authorized keys may need to re-enable it or convert to matching against addresses. New Features ------------ Much of OpenSSH's internal code has been re-factored to be more library-like. These changes are mostly not user-visible, but have greatly improved OpenSSH's testability and internal layout. Add FingerprintHash option to ssh 1 and sshd 8 , and equivalent command-line flags to the other tools to control algorithm used for key fingerprints. The default changes from MD5 to SHA256 and format from hex to base64. Fingerprints now have the hash algorithm prepended. An example of the new format: SHA256:mVPwvezndPv/ARoIadVY98vAC0g+P/5633yTC4d/wXE Please note that visual host keys will also be different. ssh 1 , sshd 8 : Experimental host key rotation support. Add a protocol extension for a server to inform a client of all its available host keys after authentication has completed. The client may record the keys in known hosts, allowing it to upgrade to better host key algorithms and a server to gracefully rotate its keys. The client side of this is controlled by a UpdateHostkeys config option default off . ssh 1 : Add a ssh config HostbasedKeyType option to control which host public key types are tried during host-based authentication. ssh 1 , sshd 8 : fix connection-killing host key mismatch errors when sshd offers multiple ECDSA keys of different lengths. ssh 1 : when host name canonicalisation is enabled, try to parse host names as addresses before looking them up for canonicalisation. fixes bz 2074 and avoiding needless DNS lookups in some cases. ssh-keygen 1 , sshd 8 : Key Revocation Lists KRLs no longer require OpenSSH to be compiled with OpenSSL support. ssh 1 , ssh-keysign 8 : Make ed25519 keys work for host based authentication. sshd 8 : SSH protocol v.1 workaround for the Meyer, et al, Bleichenbacher Side Channel Attack. Fake up a bignum key before RSA decryption. sshd 8 : Remember which public keys have been used for authentication and refuse to accept previously-used keys. This allows AuthenticationMethods=publickey,publickey to require that users authenticate using two different public keys. sshd 8 : add sshd config HostbasedAcceptedKeyTypes and PubkeyAcceptedKeyTypes options to allow sshd to control what public key types will be accepted. Currently defaults to all. sshd 8 : Don't count partial authentication success as a failure against MaxAuthTries. ssh 1 : Add RevokedHostKeys option for the client to allow text-file or KRL-based revocation of host keys. ssh-keygen 1 , sshd 8 : Permit KRLs that revoke certificates by serial number or key ID without scoping to a particular CA. ssh 1 : Add a "Match canonical" criteria that allows ssh config Match blocks to trigger only in the second config pass. ssh 1 : Add a -G option to ssh that causes it to parse its configuration and dump the result to stdout, similar to "sshd -T". ssh 1 : Allow Match criteria to be negated. E.g. "Match host". The regression test suite has been extended to cover more OpenSSH features. The unit tests have been expanded and now cover key exchange. Bugfixes ssh-keyscan 1 : ssh-keyscan has been made much more robust again servers that hang or violate the SSH protocol. ssh 1 , ssh-keygen 1 : Fix regression bz 2306: Key path names were being lost as comment fields. ssh 1 : Allow ssh config Port options set in the second config parse phase to be applied they were being ignored . bz 2286 ssh 1 : Tweak config re-parsing with host canonicalisation - make the second pass through the config files always run when host name canonicalisation is enabled and not whenever the host name changes bz 2267 ssh 1 : Fix passing of wildcard forward bind addresses when connection multiplexing is in use; bz 2324; ssh-keygen 1 : Fix broken private key conversion from non-OpenSSH formats; bz 2345. ssh-keygen 1 : Fix KRL generation bug when multiple CAs are in use. Various fixes to manual pages: bz 2288, bz 2316, bz 2273 Portable OpenSSH Support --without-openssl at configure time Disables and removes dependency on OpenSSL. Many features, including SSH protocol 1 are not supported and the set of crypto options is greatly restricted. This will only work on systems with native arc4random or /dev/urandom. Considered highly experimental for now. Support --without-ssh1 option at configure time Allows disabling support for SSH protocol 1. sshd 8 : Fix compilation on systems with IPv6 support in utmpx; bz 2296 Allow custom service name for sshd on Cygwin. Permits the use of multiple sshd running with different service names. Checksums: ========== - SHA1 openssh-6.8.tar.gz = 99903c6ca76e0a2c044711017f81127e12459d37 - SHA256 openssh-6.8.tar.gz = N1uzVarFbrm2CzAwuDu3sRoszmqpK+5phAChP/QNyuw= - SHA1 openssh-6.8p1.tar.gz = cdbc51e46a902b30d263b05fdc71340920e91c92 - SHA256 openssh-6.8p1.tar.gz = P/ZM5z7hJEgLW/dnuYMNfTwDu8tqvnFrePAZLDfOFg4= Please note that the PGP key used to sign releases was recently rotated. The new key has been signed by the old key to provide continuity. It is available from the mirror sites as RELEASE KEY.asc. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 6.7 was released on 2014-10-06. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 6.6 ========================= Potentially-incompatible changes sshd 8 : The default set of ciphers and MACs has been altered to remove unsafe algorithms. In particular, CBC ciphers and arcfour are disabled by default. The full set of algorithms remains available if configured explicitly via the Ciphers and MACs sshd config options. sshd 8 : Support for tcpwrappers/libwrap has been removed. OpenSSH 6.5 and 6.6 have a bug that causes ~0.2% of connections using the curve25519-sha256@libssh.org KEX exchange method to fail when connecting with something that implements the specification correctly. OpenSSH 6.7 disables this KEX method when speaking to one of the affected versions. New Features Major internal refactoring to begin to make part of OpenSSH usable as a library. So far the wire parsing, key handling and KRL code has been refactored. Please note that we do not consider the API stable yet, nor do we offer the library in separable form. ssh 1 , sshd 8 : Add support for Unix domain socket forwarding. A remote TCP port may be forwarded to a local Unix domain socket and vice versa or both ends may be a Unix domain socket. ssh 1 , ssh-keygen 1 : Add support for SSHFP DNS records for ED25519 key types. sftp 1 : Allow resumption of interrupted uploads. ssh 1 : When rekeying, skip file/DNS lookups of the hostkey if it is the same as the one sent during initial key exchange; bz 2154 sshd 8 : Allow explicit ::1 and 127.0.0.1 forwarding bind addresses when GatewayPorts=no; allows client to choose address family; bz 2222 sshd 8 : Add a sshd config PermitUserRC option to control whether ~/.ssh/rc is executed, mirroring the no-user-rc authorized keys option; bz 2160 ssh 1 : Add a %C escape sequence for LocalCommand and ControlPath that expands to a unique identifier based on a hash of the tuple of local host, remote user, hostname, port . Helps avoid exceeding miserly pathname limits for Unix domain sockets in multiplexing control paths; bz 2220 sshd 8 : Make the "Too many authentication failures" message include the user, source address, port and protocol in a format similar to the authentication success / failure messages; bz 2199 Added unit and fuzz tests for refactored code. These are run automatically in portable OpenSSH via the "make tests" target. Bugfixes sshd 8 : Fix remote forwarding with the same listen port but different listen address. ssh 1 : Fix inverted test that caused PKCS 11 keys that were explicitly listed in ssh config or on the commandline not to be preferred. ssh-keygen 1 : Fix bug in KRL generation: multiple consecutive revoked certificate serial number ranges could be serialised to an invalid format. Readers of a broken KRL caused by this bug will fail closed, so no should-have-been-revoked key will be accepted. ssh 1 : Reflect stdio-forward "ssh -W host:port ..." failures in exit status. Previously we were always returning 0; bz 2255 ssh 1 , ssh-keygen 1 : Make Ed25519 keys' title fit properly in the randomart border; bz 2247 ssh-agent 1 : Only cleanup agent socket in the main agent process and not in any subprocesses it may have started e.g. forked askpass . Fixes agent sockets being zapped when askpass processes fatal ; bz 2236 ssh-add 1 : Make stdout line-buffered; saves partial output getting lost when ssh-add fatal s part-way through e.g. when listing keys from an agent that supports key types that ssh-add doesn't ; bz 2234 ssh-keygen 1 : When hashing or removing hosts, don't choke on @revoked markers and don't remove @cert-authority markers; bz 2241 ssh 1 : Don't fatal when hostname canonicalisation fails and a ProxyCommand is in use; continue and allow the ProxyCommand to connect anyway e.g. to a host with a name outside the DNS behind a bastion scp 1 : When copying local- remote fails during read, don't send uninitialised heap to the remote end. sftp 1 : Fix fatal "el insertstr failed" errors when tab-completing filenames with a single quote char somewhere in the string; bz 2238 ssh-keyscan 1 : Scan for Ed25519 keys by default. ssh 1 : When using VerifyHostKeyDNS with a DNSSEC resolver, down- convert any certificate keys to plain keys and attempt SSHFP resolution. Prevents a server from skipping SSHFP lookup and forcing a new-hostkey dialog by offering only certificate keys. sshd 8 : Avoid crash at exit via NULL pointer reference; bz 2225 Fix some strict-alignment errors. Portable OpenSSH Portable OpenSSH now supports building against libressl-portable. Portable OpenSSH now requires openssl 0.9.8f or greater. Older versions are no longer supported. In the OpenSSL version check, allow fix version upgrades but not downgrades. Debian bug 748150. sshd 8 : On Cygwin, determine privilege separation user at runtime, since it may need to be a domain account. sshd 8 : Don't attempt to use vhangup on Linux. It doesn't work for non-root users, and for them it just messes up the tty settings. Use CLOCK BOOTTIME in preference to CLOCK MONOTONIC when it is available. It considers time spent suspended, thereby ensuring timeouts e.g. for expiring agent keys fire correctly. bz 2228 Add support for ed25519 to opensshd.init init script. sftp-server 8 : On platforms that support it, use prctl to prevent sftp-server from accessing /proc/self/{mem,maps} Checksums: ========== - SHA1 openssh-6.7.tar.gz = 315497b27a0186e4aef67987cfc9f3d9ba561cd8 - SHA256 openssh-6.7.tar.gz = /me/hPxDw9Tfd3siNKQubSQph84qiKwftiMsgj6nh5E= - SHA1 openssh-6.7p1.tar.gz = 14e5fbed710ade334d65925e080d1aaeb9c85bf6 - SHA256 openssh-6.7p1.tar.gz = svg5Tq6Fjau9732sELma7ADJVGJ1PoA0LlMLu29yVQc= Please note that the PGP key used to sign releases was recently rotated. The new key has been signed by the old key to provide continuity. It is available from the mirror sites as RELEASE KEY.asc. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 6.6 was released on 2014-03-15. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 6.6 ========================= This is primarily a bugfix release. Security: sshd 8 : when using environment passing with a sshd config 5 AcceptEnv pattern with a wildcard. OpenSSH prior to 6.6 could be tricked into accepting any enviornment variable that contains the characters before the wildcard character. New / changed features: ssh 1 , sshd 8 : this release removes the J-PAKE authentication code. This code was experimental, never enabled and had been unmaintained for some time. ssh 1 : when processing Match blocks, skip 'exec' clauses other clauses predicates failed to match. ssh 1 : if hostname canonicalisation is enabled and results in the destination hostname being changed, then re-parse ssh config 5 files using the new destination hostname. This gives 'Host' and 'Match' directives that use the expanded hostname a chance to be applied. Bugfixes: ssh 1 : avoid spurious "getsockname failed: Bad file descriptor" in ssh -W. bz 2200, debian 738692 sshd 8 : allow the shutdown 2 syscall in seccomp-bpf and systrace sandbox modes, as it is reachable if the connection is terminated during the pre-auth phase. ssh 1 , sshd 8 : fix unsigned overflow that in SSH protocol 1 bignum parsing. Minimum key length checks render this bug unexploitable to compromise SSH 1 sessions. sshd config 5 : clarify behaviour of a keyword that appears in multiple matching Match blocks. bz 2184 ssh 1 : avoid unnecessary hostname lookups when canonicalisation is disabled. bz 2205 sshd 8 : avoid sandbox violation crashes in GSSAPI code by caching the supported list of GSSAPI mechanism OIDs before entering the sandbox. bz 2107 ssh 1 : fix possible crashes in SOCKS4 parsing caused by assumption that the SOCKS username is nul-terminated. ssh 1 : fix regression for UsePrivilegedPort=yes when BindAddress is not specified. ssh 1 , sshd 8 : fix memory leak in ECDSA signature verification. ssh 1 : fix matching of 'Host' directives in ssh config 5 files to be case-insensitive again regression in 6.5 . Portable OpenSSH: sshd 8 : don't fatal if the FreeBSD Capsicum is offered by the system headers and libc but is not supported by the kernel. Fix build using the HP-UX compiler. Checksums: ========== - SHA1 openssh-6.6.tar.gz = bf932d798324ff2502409d3714d0ad8d65c7e1e7 - SHA256 openssh-6.6.tar.gz = jaSJE5aiQRm+91dV6EvVGr/ozo33tbxyjjFSiu+Cy80= - SHA1 openssh-6.6p1.tar.gz = b850fd1af704942d9b3c2eff7ef6b3a59b6a6b6e - SHA256 openssh-6.6p1.tar.gz = SMHwZktFNIdQOABMxPNVW4MpwqgcHfSNtcUXgA3iA7s= Please note that the PGP key used to sign releases was recently rotated. The new key has been signed by the old key to provide continuity. It is available from the mirror sites as RELEASE KEY.asc. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Changes since OpenSSH 6.4 ========================= This is a feature-focused release. New features: ssh 1 , sshd 8 : Add support for key exchange using elliptic-curve Diffie Hellman in Daniel Bernstein's Curve25519. This key exchange method is the default when both the client and server support it. ssh 1 , sshd 8 : Add support for Ed25519 as a public key type. Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. Add a new private key format that uses a bcrypt KDF to better protect keys at rest. This format is used unconditionally for Ed25519 keys, but may be requested when generating or saving existing keys of other types via the -o ssh-keygen 1 option. We intend to make the new format the default in the near future. Details of the new format are in the PROTOCOL.key file. ssh 1 , sshd 8 : Add a new transport cipher "chacha20-poly1305@openssh.com" that combines Daniel Bernstein's ChaCha20 stream cipher and Poly1305 MAC to build an authenticated encryption mode. Details are in the PROTOCOL.chacha20poly1305 file. ssh 1 , sshd 8 : Refuse RSA keys from old proprietary clients and servers that use the obsolete RSA+MD5 signature scheme. It will still be possible to connect with these clients/servers but only DSA keys will be accepted, and OpenSSH will refuse connection entirely in a future release. ssh 1 , sshd 8 : Refuse old proprietary clients and servers that use a weaker key exchange hash calculation. ssh 1 : Increase the size of the Diffie-Hellman groups requested for each symmetric key size. New values from NIST Special Publication 800-57 with the upper limit specified by RFC4419. ssh 1 , ssh-agent 1 : Support PKCS 11 tokens that only provide X.509 certs instead of raw public keys requested as bz 1908 . ssh 1 : Add a ssh config 5 "Match" keyword that allows conditional configuration to be applied by matching on hostname, user and result of arbitrary commands. ssh 1 : Add support for client-side hostname canonicalisation using a set of DNS suffixes and rules in ssh config 5 . This allows unqualified names to be canonicalised to fully-qualified domain names to eliminate ambiguity when looking up keys in known hosts or checking host certificate names. sftp-server 8 : Add the ability to whitelist and/or blacklist sftp protocol requests by name. sftp-server 8 : Add a sftp "fsync@openssh.com" to support calling fsync 2 on an open file handle. sshd 8 : Add a ssh config 5 PermitTTY to disallow TTY allocation, mirroring the longstanding no-pty authorized keys option. ssh 1 : Add a ssh config ProxyUseFDPass option that supports the use of ProxyCommands that establish a connection and then pass a connected file descriptor back to ssh 1 . This allows the ProxyCommand to exit rather than staying around to transfer data. Bugfixes: ssh 1 , sshd 8 : Fix potential stack exhaustion caused by nested certificates. ssh 1 : bz 1211: make BindAddress work with UsePrivilegedPort. sftp 1 : bz 2137: fix the progress meter for resumed transfer. ssh-add 1 : bz 2187: do not request smartcard PIN when removing keys from ssh-agent. sshd 8 : bz 2139: fix re-exec fallback when original sshd binary cannot be executed. ssh-keygen 1 : Make relative-specified certificate expiry times relative to current time and not the validity start time. sshd 8 : bz 2161: fix AuthorizedKeysCommand inside a Match block. sftp 1 : bz 2129: symlinking a file would incorrectly canonicalise the target path. ssh-agent 1 : bz 2175: fix a use-after-free in the PKCS 11 agent helper executable. sshd 8 : Improve logging of sessions to include the user name, remote host and port, the session type shell, command, etc. and allocated TTY if any . sshd 8 : bz 1297: tell the client via a debug message when their preferred listen address has been overridden by the server's GatewayPorts setting. sshd 8 : bz 2162: include report port in bad protocol banner message. sftp 1 : bz 2163: fix memory leak in error path in do readdir . sftp 1 : bz 2171: don't leak file descriptor on error. sshd 8 : Include the local address and port in "Connection from ..." message only shown at loglevel =verbose . Portable OpenSSH: Please note that this is the last version of Portable OpenSSH that will support versions of OpenSSL prior to 0.9.6. Support i.e. SSH OLD EVP will be removed following the 6.5p1 release. Portable OpenSSH will attempt compile and link as a Position Independent Executable on Linux, OS X and OpenBSD on recent gcc- like compilers. Other platforms and older/other compilers may request this using the --with-pie configure flag. A number of other toolchain-related hardening options are used automatically if available, including -ftrapv to abort on signed integer overflow and options to write-protect dynamic linking information. The use of these options may be disabled using the --without-hardening configure flag. If the toolchain supports it, one of the -fstack-protector-strong, -fstack-protector-all or -fstack-protector compilation flag are used to add guards to mitigate attacks based on stack overflows. The use of these options may be disabled using the --without-stackprotect configure option. sshd 8 : Add support for pre-authentication sandboxing using the Capsicum API introduced in FreeBSD 10. Switch to a ChaCha20-based arc4random PRNG for platforms that do not provide their own. sshd 8 : bz 2156: restore Linux oom adj setting when handling SIGHUP to maintain behaviour over retart. sshd 8 : bz 2032: use local username in krb5 kuserok check rather than full client name which may be of form user@REALM. ssh 1 , sshd 8 : Test for both the presence of ECC NID numbers in OpenSSL and that they actually work. Fedora at least has NID secp521r1 that doesn't work. bz 2173: use pkg-config --libs to include correct -L location for libedit. Checksums: ========== - SHA1 openssh-6.5.tar.gz = 0a375e20d895670489a9241f8faa57670214fbed - SHA256 openssh-6.5.tar.gz = sK5q2rB0o5JCbEmbeE/6N9DtJkT81dwmeuhogT4i900= - SHA1 openssh-6.5p1.tar.gz = 3363a72b4fee91b29cf2024ff633c17f6cd2f86d - SHA256 openssh-6.5p1.tar.gz = oRle1V25RSUtWhcw1KKipcHJpqoB7y5a91CpYmI9kCc= Please note that the PGP key used to sign releases has been rotated. The new key has been signed by the old key to provide continuity. It is available from the mirror sites as RELEASE KEY.asc. Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Changes since OpenSSH 6.3 ========================= This release fixes a security bug: sshd 8 : fix a memory corruption problem triggered during rekeying when an AES-GCM cipher is selected. Full details of the vulnerability are available at: http://www.openssh.com/txt/gcmrekey.adv Checksums: ========== - SHA1 openssh-6.4.tar.gz = 4caf1a50eb3a3da821c16298c4aaa576fe24210c - SHA1 openssh-6.4p1.tar.gz = cf5fe0eb118d7e4f9296fbc5d6884965885fc55d Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Changes since OpenSSH 6.2 ========================= This release is predominantly a bugfix release: Features: sshd 8 : add ssh-agent 1 support to sshd 8 ; allows encrypted hostkeys, or hostkeys on smartcards. ssh 1 /sshd 8 : allow optional time-based rekeying via a second argument to the existing RekeyLimit option. RekeyLimit is now supported in sshd config as well as on the client. sshd 8 : standardise logging of information during user authentication. The presented key/cert and the remote username if available is now logged in the authentication success/failure message on the same log line as the local username, remote host/port and protocol in use. Certificates contents and the key fingerprint of the signing CA are logged too. Including all relevant information on a single line simplifies log analysis as it is no longer necessary to relate information scattered across multiple log entries. ssh 1 : add the ability to query which ciphers, MAC algorithms, key types and key exchange methods are supported in the binary. ssh 1 : support ProxyCommand=- to allow support cases where stdin and stdout already point to the proxy. ssh 1 : allow IdentityFile=none ssh 1 /sshd 8 : add -E option to ssh and sshd to append debugging logs to a specified file instead of stderr or syslog. sftp 1 : add support for resuming partial downloads using the "reget" command and on the sftp commandline or on the "get" commandline using the "-a" append option. ssh 1 : add an "IgnoreUnknown" configuration option to selectively suppress errors arising from unknown configuration directives. sshd 8 : add support for submethods to be appended to required authentication methods listed via AuthenticationMethods. Bugfixes: sshd 8 : fix refusal to accept certificate if a key of a different type to the CA key appeared in authorized keys before the CA key. ssh 1 /ssh-agent 1 /sshd 8 : Use a monotonic time source for timers so that things like keepalives and rekeying will work properly over clock steps. sftp 1 : update progressmeter when data is acknowledged, not when it's sent. bz 2108 ssh 1 /ssh-keygen 1 : improve error messages when the current user does not exist in /etc/passwd; bz 2125 ssh 1 : reset the order in which public keys are tried after partial authentication success. ssh-agent 1 : clean up socket files after SIGINT when in debug mode; bz 2120 ssh 1 and others: avoid confusing error messages in the case of broken system resolver configurations; bz 2122 ssh 1 : set TCP nodelay for connections started with -N; bz 2124 ssh 1 : correct manual for permission requirements on ~/.ssh/config; bz 2078 ssh 1 : fix ControlPersist timeout not triggering in cases where TCP connections have hung. bz 1917 ssh 1 : properly deatch a ControlPersist master from its controlling terminal. sftp 1 : avoid crashes in libedit when it has been compiled with multi- byte character support. bz 1990 sshd 8 : when running sshd -D, close stderr unless we have explicitly requested logging to stderr. bz 1976, ssh 1 : fix incomplete bzero; bz 2100 sshd 8 : log and error and exit if ChrootDirectory is specified and running without root privileges. Many improvements to the regression test suite. In particular log files are now saved from ssh and sshd after failures. Fix a number of memory leaks. bz 1967 bz 2096 and others sshd 8 : fix public key authentication when a :style is appended to the requested username. ssh 1 : do not fatally exit when attempting to cleanup multiplexing- created channels that are incompletely opened. bz 2079 Portable OpenSSH: Major overhaul of contrib/cygwin/README Fix unaligned accesses in umac.c for strict-alignment architectures. bz 2101 Enable -Wsizeof-pointer-memaccess if the compiler supports it. bz 2100 Fix broken incorrect commandline reporting errors. bz 1448 Only include SHA256 and ECC-based key exchange methods if libcrypto has the required support. Fix crash in SOCKS5 dynamic forwarding code on strict-alignment architectures. A number of portability fixes for Android: Don't try to use lastlog on Android; bz 2111 Fall back to using openssl's DES crypt function on platorms that don't have a native crypt function; bz 2112 Test for fd mask, howmany and NFDBITS rather than trying to enumerate the plaforms that don't have them. bz 2085 Replace S IWRITE, which isn't standardized, with S IWUSR, which is. bz 2085 Add a null implementation of endgrent for platforms that don't have it eg Android bz 2087 Support platforms, such as Android, that lack struct passwd.pw gecos. bz 2086 Checksums: ========== - SHA1 openssh-6.3.tar.gz = 8a6ef99ffc80c19e9afe9fe1e857370f6adcf450 - SHA1 openssh-6.3p1.tar.gz = 70845ca79474258cab29dbefae13d93e41a83ccb Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Changes since OpenSSH 6.2p1 =========================== This is a bugfix release: Bugfixes: ssh 1 : Only warn for missing identity files that were explicitly specified. Fix bug in contributed contrib/ssh-copy-id script that could result in "rm " being called on mktemp failure. bz 2105 sshd 8 : Quiet disconnect notifications on the server from error back to logit from error for normal, client-initiated disconnections. bz 2057 Avoid conflicting definitions of int64 on Cygwin Checksums: ========== - SHA1 openssh-6.2p2.tar.gz = c2b4909eba6f5ec6f9f75866c202db47f3b501ba Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Changes since OpenSSH 6.1 ========================= This release introduces a number of new features: Features: ssh 1 /sshd 8 : Added support for AES-GCM authenticated encryption in SSH protocol 2. The new cipher is available as aes128-gcm@openssh.com and aes256-gcm@openssh.com. It uses an identical packet format to the AES-GCM mode specified in RFC 5647, but uses simpler and different selection rules during key exchange. ssh 1 /sshd 8 : Added support for encrypt-then-mac EtM MAC modes for SSH protocol 2. These modes alter the packet format and compute the MAC over the packet length and encrypted packet rather than over the plaintext data. These modes are considered more secure and are used by default when available. ssh 1 /sshd 8 : Added support for the UMAC-128 MAC as "umac-128@openssh.com" and "umac-128-etm@openssh.com". The latter being an encrypt-then-mac mode. sshd 8 : Added support for multiple required authentication in SSH protocol 2 via an AuthenticationMethods option. This option lists one or more comma-separated lists of authentication method names. Successful completion of all the methods in any list is required for authentication to complete. This allows, for example, requiring a user having to authenticate via public key or GSSAPI before they are offered password authentication. sshd 8 /ssh-keygen 1 : Added support for Key Revocation Lists KRLs , a compact binary format to represent lists of revoked keys and certificates that take as little as one bit per certificate when revoking by serial number. KRLs may be generated using ssh-keygen 1 and are loaded into sshd 8 via the existing RevokedKeys sshd config option. ssh 1 : IdentitiesOnly now applies to keys obtained from a PKCS11Provider. This allows control of which keys are offered from tokens using IdentityFile. sshd 8 : sshd config 5 's AllowTcpForwarding now accepts "local" and "remote" in addition to its previous "yes"/"no" keywords to allow the server to specify whether just local or remote TCP forwarding is enabled. sshd 8 : Added a sshd config 5 option AuthorizedKeysCommand to support fetching authorized keys from a command in addition to or instead of from the filesystem. The command is run under an account specified by an AuthorizedKeysCommandUser sshd config 5 option. sftp-server 8 : Now supports a -d option to allow the starting directory to be something other than the user's home directory. ssh-keygen 1 : Now allows fingerprinting of keys hosted in PKCS 11 tokens using "ssh-keygen -lD pkcs11 provider". ssh 1 : When SSH protocol 2 only is selected the default , ssh 1 now immediately sends its SSH protocol banner to the server without waiting to receive the server's banner, saving time when connecting. ssh 1 : Added ~v and ~V escape sequences to raise and lower the logging level respectively. ssh 1 : Made the escape command help ~? context sensitive so that only commands that will work in the current session are shown. ssh-keygen 1 : When deleting host lines from known hosts using "ssh-keygen -R host", ssh-keygen 1 now prints details of which lines were removed. Bugfixes: ssh 1 : Force a clean shutdown of ControlMaster client sessions when the ~. escape sequence is used. This means that ~. should now work in mux clients even if the server is no longer responding. ssh 1 : Correctly detect errors during local TCP forward setup in multiplexed clients. bz 2055 ssh-add 1 : Made deleting explicit keys "ssh-add -d" symmetric with adding keys with respect to certificates. It now tries to delete the corresponding certificate and respects the -k option to allow deleting of the key only. sftp 1 : Fix a number of parsing and command-editing bugs, including bz 1956 ssh 1 : When muxmaster is run with -N, ensured that it shuts down gracefully when a client sends it "-O stop" rather than hanging around. bz 1985 ssh-keygen 1 : When screening moduli candidates, append to the file rather than overwriting to allow resumption. bz 1957 ssh 1 : Record "Received disconnect" messages at ERROR rather than INFO priority. bz 2057. ssh 1 : Loudly warn if explicitly-provided private key is unreadable. bz 1981 Portable OpenSSH: sshd 8 : The Linux seccomp-filter sandbox is now supported on ARM platforms where the kernel supports it. sshd 8 : The seccomp-filter sandbox will not be enabled if the system headers support it at compile time, regardless of whether it can be enabled then. If the run-time system does not support seccomp-filter, sshd will fall back to the rlimit pseudo-sandbox. ssh 1 : Don't link in the Kerberos libraries. They aren't necessary on the client, just on sshd 8 . bz 2072 Fix GSSAPI linking on Solaris, which uses a differently-named GSSAPI library. bz 2073 Fix compilation on systems with openssl-1.0.0-fips. Fix a number of errors in the RPM spec files. Checksums: ========== - SHA1 openssh-6.2.tar.gz = b3f6cd774d345f22f6d0038cc9464cce131a0676 - SHA1 openssh-6.2p1.tar.gz = 8824708c617cc781b2bb29fa20bd905fd3d2a43d Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 6.1 was released on 2012-08-29. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 6.0 ========================= This is primarily a bugfix release. Features: sshd 8 : This release turns on pre-auth sandboxing sshd by default for new installs, by setting UsePrivilegeSeparation=sandbox in sshd config. ssh-keygen 1 : Add options to specify starting line number and number of lines to process when screening moduli candidates, allowing processing of different parts of a candidate moduli file in parallel sshd 8 : The Match directive now supports matching on the local listen address and port upon which the incoming connection was received via LocalAddress and LocalPort clauses. sshd 8 : Extend sshd config Match directive to allow setting AcceptEnv and {Allow,Deny}{Users,Groups} Add support for RFC6594 SSHFP DNS records for ECDSA key types. bz 1978 ssh-keygen 1 : Allow conversion of RSA1 keys to public PEM and PKCS8 sshd 8 : Allow the sshd config PermitOpen directive to accept "none" as an argument to refuse all port-forwarding requests. sshd 8 : Support "none" as an argument for AuthorizedPrincipalsFile ssh-keyscan 1 : Look for ECDSA keys by default. bz 1971 sshd 8 : Add "VersionAddendum" to sshd config to allow server operators to append some arbitrary text to the server SSH protocol banner. Bugfixes: ssh 1 /sshd 8 : Don't spin in accept in situations of file descriptor exhaustion. Instead back off for a while. ssh 1 /sshd 8 : Remove hmac-sha2-256-96 and hmac-sha2-512-96 MACs as they were removed from the specification. bz 2023, sshd 8 : Handle long comments in config files better. bz 2025 ssh 1 : Delay setting tty flag so RequestTTY options are correctly picked up. bz 1995 sshd 8 : Fix handling of /etc/nologin incorrectly being applied to root on platforms that use login cap. Portable OpenSSH: sshd 8 : Allow sshd pre-auth sandboxing to fall-back to the rlimit sandbox from the Linux SECCOMP filter sandbox when the latter is not available in the kernel. ssh 1 : Fix NULL dereference when built with LDNS and using DNSSEC to retrieve a CNAME SSHFP record. Fix cross-compilation problems related to pkg-config. bz 1996 Checksums: ========== - SHA1 openssh-6.1.tar.gz = 7ed5b491cfebcaee2273d1f872314107273c2167 - SHA1 openssh-6.1p1.tar.gz = 751c92c912310c3aa9cadc113e14458f843fc7b3 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 6.0 was released on 2012-04-22. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.9 ========================= This is primarily a bugfix release. Features: ssh-keygen 1 : Add optional checkpoints for moduli screening ssh-add 1 : new -k option to load plain keys skipping certificates sshd 8 : Add wildcard support to PermitOpen, allowing things like "PermitOpen localhost: ". bz 1857 ssh 1 : support for cancelling local and remote port forwards via the multiplex socket. Use ssh -O cancel -L xx:xx:xx -R yy:yy:yy user@host" to request the cancellation of the specified forwardings support cancellation of local/dynamic forwardings from ~C commandline Bugfixes: ssh 1 : ensure that $DISPLAY contains only valid characters before using it to extract xauth data so that it can't be used to play local shell metacharacter games. ssh 1 : unbreak remote portforwarding with dynamic allocated listen ports scp 1 : uppress adding '--' to remote commandlines when the first argument does not start with '-'. saves breakage on some difficult-to-upgrade embedded/router platforms ssh 1 /sshd 8 : fix typo in IPQoS parsing: there is no "AF14" class, but there is an "AF21" class ssh 1 /sshd 8 : do not permit SSH2 MSG SERVICE REQUEST/ACCEPT during rekeying ssh 1 : skip attempting to create ~/.ssh when -F is passed sshd 8 : unbreak stdio forwarding when ControlPersist is in use; bz 1943 sshd 1 : send tty break to pty master instead of probably already closed slave side; bz 1859 sftp 1 : silence error spam for "ls /foo" in directory with files; bz 1683 Fixed a number of memory and file descriptor leaks Portable OpenSSH: Add a new privilege separation sandbox implementation for Linux's new seccomp sandbox, automatically enabled on platforms that support it. Note: privilege separation sandboxing is still experimental Fix compilation problems on FreeBSD, where libutil contained openpty but not login . ssh-keygen 1 : don't fail in -A on platforms that don't support ECC Add optional support for LDNS, a BSD licensed DNS resolver library which supports DNSSEC Relax OpenSSL version check to allow running OpenSSH binaries on systems with OpenSSL libraries with a newer "fix" or "patch" level than the binaries were originally compiled on previous check only allowed movement within "patch" releases . bz 1991 Fix builds using contributed Redhat spec file. bz 1992 Checksums: ========== - SHA1 openssh-6.0.tar.gz = 5d30aba0423c44e89924bb44c5d2153635506a9f - SHA1 openssh-6.0p1.tar.gz = f691e53ef83417031a2854b8b1b661c9c08e4422 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.9 was released on 2011-09-06. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.8 ========================= Features: Introduce sandboxing of the pre-auth privsep child using an optional sshd config 5 "UsePrivilegeSeparation=sandbox" mode that enables mandatory restrictions on the syscalls the privsep child can perform. This intention is to prevent a compromised privsep child from being used to attack other hosts by opening sockets and proxying or probing local kernel attack surface. Three concrete sandbox implementation are provided selected at configure time : systrace, seatbelt and rlimit. The systrace sandbox uses systrace 4 in unsupervised "fast-path" mode, where a list of permitted syscalls is supplied. Any syscall not on the list results in SIGKILL being sent to the privsep child. Note that this requires a kernel with the new SYSTR POLICY KILL option only OpenBSD has this mode at present . The seatbelt sandbox uses OS X/Darwin sandbox 7 facilities with a strict kSBXProfilePureComputation policy that disables access to filesystem and network resources. The rlimit sandbox is a fallback choice for platforms that don't support a better one; it uses setrlimit to reset the hard-limit of file descriptors and processes to zero, which should prevent the privsep child from forking or opening new network connections. Sandboxing of the privilege separated child process is currently experimental but should become the default in a future release. Native sandboxes for other platforms are welcome e.g. Capsicum, Linux pid/net namespaces, etc. Add new SHA256-based HMAC transport integrity modes from http://www.ietf.org/id/draft-dbider-sha2-mac-for-ssh-02.txt These modes are hmac-sha2-256, hmac-sha2-256-96, hmac-sha2-512, and hmac-sha2-512-96, and are available by default in ssh 1 and sshd 8 The pre-authentication sshd 8 privilege separation slave process now logs via a socket shared with the master process, avoiding the need to maintain /dev/log inside the chroot. ssh 1 now warns when a server refuses X11 forwarding sshd config 5 's AuthorizedKeysFile now accepts multiple paths, separated by whitespace. The undocumented AuthorizedKeysFile2 option is deprecated though the default for AuthorizedKeysFile includes .ssh/authorized keys2 sshd config 5 : similarly deprecate UserKnownHostsFile2 and GlobalKnownHostsFile2 by making UserKnownHostsFile and GlobalKnownHostsFile accept multiple options and default to include known hosts2 Retain key comments when loading v.2 keys. These will be visible in "ssh-add -l" and other places. bz 439 ssh 1 and sshd 8 : set IPv6 traffic class from IPQoS as well as IPv4 ToS/DSCP . bz 1855 ssh config 5 's ControlPath option now expands %L to the host portion of the destination host name. ssh config 5 "Host" options now support negated Host matching, e.g. Host .example.org c.example.org User mekmitasdigoat Will match "a.example.org", "b.example.org", but not "c.example.org" ssh config 5 : a new RequestTTY option provides control over when a TTY is requested for a connection, similar to the existing -t/-tt/-T ssh 1 commandline options. sshd 8 : allow GSSAPI authentication to detect when a server-side failure causes authentication failure and don't count such failures against MaxAuthTries; bz 1244 ssh-keygen 1 : Add -A option. For each of the key types rsa1, rsa, dsa and ecdsa for which host keys do not exist, generate the host keys with the default key file path, an empty passphrase, default bits for the key type, and default comment. This is useful for system initialisation scripts. ssh 1 : Allow graceful shutdown of multiplexing: request that a mux server removes its listener socket and refuse future multiplexing requests but don't kill existing connections. This may be requested using "ssh -O stop ..." ssh-add 1 now accepts keys piped from standard input. E.g. "ssh-add - < /path/to/key" ssh-keysign 8 now signs hostbased authentication challenges correctly using ECDSA keys; bz 1858 sftp 1 : document that sftp accepts square brackets to delimit addresses useful for IPv6 ; bz 1847a ssh 1 : when using session multiplexing, the master process will change its process title to reflect the control path in use and when a ControlPersist-ed master is waiting to close; bz 1883 and bz 1911 Other minor bugs fixed: 1849 1861 1862 1869 1875 1878 1879 1892 1900 1905 1913 Portable OpenSSH Bugfixes: Fix a compilation error in the SELinux support code. bz 1851 This release removes support for ssh-rand-helper. OpenSSH now obtains its random numbers directly from OpenSSL or from a PRNGd/EGD instance specified at configure time. sshd 8 now resets the SELinux process execution context before executing passwd for password changes; bz 1891 Since gcc = 4.x ignores all -Wno-options options, test only the corresponding -W-option when trying to determine whether it is accepted; bz 1901 Add ECDSA key generation to the Cygwin ssh-{host,user}-config scripts. Updated .spec and init files for Linux; bz 1920 Improved SELinux error messages in context change failures and suppress error messages when attempting to change from the "unconfined t" type; bz 1924 bz 1919 Fix build errors on platforms without dlopen ; bz 1929 Checksums: ========== - SHA1 openssh-5.9.tar.gz = bc0cb728bbc394769f9a2ce5b8cd99dc41e12632 - SHA1 openssh-5.9p1.tar.gz = ac4e0055421e9543f0af5da607a72cf5922dcc56 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Portable OpenSSH 5.8p2 was released on 2011-05-03. It will be available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.8p1 =========================== Security: Fix local private host key compromise on platforms without host- level randomness support e.g. /dev/random reported by Tomas Mraz On hosts that did not have a randomness source configured in OpenSSL and were not configured to use EGD/PRNGd using the --with-prngd-socket configure option , the ssh-rand-helper command was being implicitly executed by ssh-keysign with open file descriptors to the host private keys. An attacker could use ptrace 2 to attach to ssh-rand-helper and exfiltrate the keys. Most modern operating systems are not vulnerable. In particular, BSD, Linux, OS X and Cygwin do not use ssh-rand-helper. A full advisory for this issue is available at: http://www.openssh.com/txt/portable-keysign-rand-helper.adv Portable OpenSSH Bugfixes: Fix compilation failure when enabling SELinux support. Revised Cygwin ssh-{host,user}-config that include ECDSA key support. Revised Cygwin ssh-host-config to be more thorough in error checking and reporting. Checksums: ========== - SHA1 openssh-5.8p2.tar.gz = 64798328d310e4f06c9f01228107520adbc8b3e5 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.8 was released on 2011-02-04. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.7 ========================= Security: Fix vulnerability in legacy certificate signing introduced in OpenSSH-5.6 and found by Mateusz Kocielski. Legacy certificates signed by OpenSSH 5.6 or 5.7 included data from the stack in place of a random nonce field. The contents of the stack do not appear to contain private data at this point, but this cannot be stated with certainty for all platform, library and compiler combinations. In particular, there exists a risk that some bytes from the privileged CA key may be accidentally included. A full advisory for this issue is available at: http://www.openssh.com/txt/legacy-cert.adv Portable OpenSSH Bugfixes: Fix compilation failure when enableing SELinux support. Do not attempt to call SELinux functions when SELinux is disabled. bz 1851 Checksums: ========== - SHA1 openssh-5.8.tar.gz = 205dece2c8b41c69b082eb65320d359987aae25b - SHA1 openssh-5.8p1.tar.gz = adebb2faa9aba2a3a3c8b401b2b19677ab53f0de Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.7 was released on 2011-01-24. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.6 ========================= Features: Implement Elliptic Curve Cryptography modes for key exchange ECDH and host/user keys ECDSA as specified by RFC5656. ECDH and ECDSA offer better performance than plain DH and DSA at the same equivalent symmetric key length, as well as much shorter keys. Only the mandatory sections of RFC5656 are implemented, specifically the three REQUIRED curves nistp256, nistp384 and nistp521 and only ECDH and ECDSA. Point compression optional in RFC5656 is NOT implemented. Certificate host and user keys using the new ECDSA key types are supported - an ECDSA key may be certified, and an ECDSA key may act as a CA to sign certificates. ECDH in a 256 bit curve field is the preferred key agreement algorithm when both the client and server support it. ECDSA host keys are preferred when learning a host's keys for the first time, or can be learned using ssh-keyscan 1 . sftp 1 /sftp-server 8 : add a protocol extension to support a hard link operation. It is available through the "ln" command in the client. The old "ln" behaviour of creating a symlink is available using its "-s" option or through the preexisting "symlink" command scp 1 : Add a new -3 option to scp: Copies between two remote hosts are transferred through the local host. Without this option the data is copied directly between the two remote hosts. ssh 1 : automatically order the hostkeys requested by the client based on which hostkeys are already recorded in known hosts. This avoids hostkey warnings when connecting to servers with new ECDSA keys, since these are now preferred when learning hostkeys for the first time. ssh 1 /sshd 8 : add a new IPQoS option to specify arbitrary TOS/DSCP/QoS values instead of hardcoding lowdelay/throughput. bz 1733 sftp 1 : the sftp client is now significantly faster at performing directory listings, using OpenBSD glob 3 extensions to preserve the results of stat 3 operations performed in the course of its execution rather than performing expensive round trips to fetch them again afterwards. ssh 1 : "atomically" create the listening mux socket by binding it on a temporary name and then linking it into position after listen has succeeded. This allows the mux clients to determine that the server socket is either ready or stale without races. stale server sockets are now automatically removed. also fixes bz 1711 ssh 1 /sshd 8 : add a KexAlgorithms knob to the client and server configuration to allow selection of which key exchange methods are used by ssh 1 and sshd 8 and their order of preference. sftp 1 /scp 1 : factor out bandwidth limiting code from scp 1 into a generic bandwidth limiter that can be attached using the atomicio callback mechanism and use it to add a bandwidth limit option to sftp 1 . bz 1147 BugFixes: ssh 1 /ssh-agent 1 : honour $TMPDIR for client xauth and ssh-agent temporary directories. bz 1809 ssh 1 : avoid NULL deref on receiving a channel request on an unknown or invalid channel; bz 1842 sshd 8 : remove a debug that pollutes stderr on client connecting to a server in debug mode; bz 1719 scp 1 : pass through ssh command-line flags and options when doing remote-remote transfers, e.g. to enable agent forwarding which is particularly useful in this case; bz 1837 sftp-server 8 : umask should be parsed as octal sftp 1 : escape ' ' in filename tab-completion ssh 1 : Typo in confirmation message. bz 1827 sshd 8 : prevent free of string in .rodata when overriding AuthorizedKeys in a Match block sshd 8 : Use default shell /bin/sh if $SHELL is "" ssh 1 : kill proxy command on fatal we already killed it on clean exit ; ssh 1 : install a SIGCHLD handler to reap expiried child process; bz 1812 Support building against openssl-1.0.0a Portable OpenSSH Bugfixes: Use mandoc as preferred manpage formatter if it is present, followed by nroff and groff respectively. sshd 8 : Relax permission requirement on btmp logs to allow group read/write bz 1840: fix warning when configuring --with-ssl-engine sshd 8 : Use correct uid t/pid t types instead of int. bz 1817 sshd 8 : bz 1824: Add Solaris Project support. sshd 8 : Check is selinux enabled for exact return code since it can apparently return -1 under some conditions. Checksums: ========== - SHA1 openssh-5.7.tar.gz = 67cb91772a33fb3a004b39bcdb9148218365494c - SHA1 openssh-5.7p1.tar.gz = 423e27475f06e1055847dfff7f61e1ac632b5372 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.6 was released on 2010-08-23. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.5 ========================= Features: Added a ControlPersist option to ssh config 5 that automatically starts a background ssh 1 multiplex master when connecting. This connection can stay alive indefinitely, or can be set to automatically close after a user-specified duration of inactivity. Hostbased authentication may now use certificate host keys. CA keys must be specified in a known hosts file using the @cert-authority marker as described in sshd 8 . ssh-keygen 1 now supports signing certificate using a CA key that has been stored in a PKCS 11 token. ssh 1 will now log the hostname and address that we connected to at LogLevel=verbose after authentication is successful to mitigate "phishing" attacks by servers with trusted keys that accept authentication silently and automatically before presenting fake password/passphrase prompts. Note that, for such an attack to be successful, the user must have disabled StrictHostKeyChecking enabled by default or an attacker must have access to a trusted host key for the destination server. Expand %h to the hostname in ssh config Hostname options. While this sounds useless, it is actually handy for working with unqualified hostnames: Host . Hostname %h Host Hostname %h.example.org Allow ssh-keygen 1 to import -i and export -e of PEM and PKCS 8 keys in addition to RFC4716 SSH.COM encodings via a new -m option bz 1749 sshd 8 will now queue debug messages for bad ownership or permissions on the user's keyfiles encountered during authentication and will send them after authentication has successfully completed. These messages may be viewed in ssh 1 at LogLevel=debug or higher. ssh 1 connection multiplexing now supports remote forwarding with dynamic port allocation and can report the allocated port back to the user: LPORT= ssh -S muxsocket -R0:localhost:25 -O forward somehost sshd 8 now supports indirection in matching of principal names listed in certificates. By default, if a certificate has an embedded principals list then the username on the server must match one of the names in the list for it to be accepted for authentication. sshd 8 now has a new AuthorizedPrincipalsFile option to specify a file containing a list of names that may be accepted in place of the username when authorizing a certificate trusted via the sshd config 5 TrustedCAKeys option. Similarly, authentication using a CA trusted in ~/.ssh/authorized keys now accepts a principals="name1 ,name2,... " to specify a list of permitted names. If either option is absent, the current behaviour of requiring the username to appear in principals continues to apply. These options are useful for role accounts, disjoint account namespaces and "user@realm"-style naming policies in certificates. Additional sshd config 5 options are now valid inside Match blocks: AuthorizedKeysFile AuthorizedPrincipalsFile HostbasedUsesNameFromPacketOnly PermitTunnel Revised the format of certificate keys. The new format, identified as ssh-{dss,rsa}-cert-v01@openssh.com includes the following changes: - Adding a serial number field. This may be specified by the CA at the time of certificate signing. - Moving the nonce field to the beginning of the certificate where it can better protect against chosen-prefix attacks on the signature hash currently infeasible against the SHA1 hash used - Renaming the "constraints" field to "critical options" - Addng a new non-critical "extensions" field. The "permit- " options are now extensions, rather than critical options to permit non-OpenSSH implementation of this key format to degrade gracefully when encountering keys with options they do not recognize. The older format is still supported for authentication and may still be used when signing certificates use "ssh-keygen -t v00 ..." . The v00 format, introduced in OpenSSH 5.4, will be supported for at least one year from this release, after which it will be deprecated and removed. BugFixes: The PKCS 11 code now retries a lookup for a private key if there is no matching key with CKA SIGN attribute enabled; this fixes fixes MuscleCard support bz 1736 Unbreak strdelim skipping past quoted strings bz 1757 . For example, the following directive was not parsed correctly: AllowUsers "blah blah" blah sftp 1 : fix swapped args in upload dir internal , breaking recursive upload depth checks and causing verbose printing of transfers to always be turned on bz 1797 Fix a longstanding problem where if you suspend scp 1 at the password/passphrase prompt the terminal mode is not restored. Fix a PKCS 11 crash on some smartcards by validating the length returned for C GetAttributValue bz 1773 sftp 1 : fix ls in working directories that contain globbing characters in their pathnames bz 1655 Print warning for missing home directory when ChrootDirectory=none bz 1564 sftp 1 : fix a memory leak in do realpath error path bz 1771 ssk-keygen 1 : Standardise error messages when attempting to open private key files to include "progname: filename: error reason" bz 1783 Replace verbose and overflow-prone Linebuf code with read keyfile line bz 1565 Include the user name on "subsystem request for ..." log messages ssh 1 and sshd 8 : remove hardcoded limit of 100 permitopen clauses and port forwards per direction bz 1327 sshd 8 : ignore stderr output from subsystems to avoid hangs if a subsystem or shell initialisation writes to stderr bz 1750 Skip the initial check for access with an empty password when PermitEmptyPasswords=no bz 1638 sshd 8 : fix logspam when key options from="..." especially deny non-matching keys bz 1765 ssh-keygen 1 : display a more helpful error message when $HOME is inaccessible while trying to create .ssh directory bz 1740 ssh 1 : fix hang when terminating a mux slave using ~. bz 1758 ssh-keygen 1 : refuse to generate keys longer than OPENSSL RD SA MAX MODULUS BITS, since we would refuse to use them anyway bz 1516 Suppress spurious tty warning when using -O and stdin is not a tty bz 1746 Kill channel when pty allocation requests fail. Fixed stuck client if the server refuses pty allocation bz 1698 Portable OpenSSH Bugfixes: sshd 8 : increase the maximum username length for login recording to 512 characters bz 1579 Initialize the values to be returned from PAM to sane values in case the PAM method doesn't write to them. bz 1795 Let configure find OpenSSL libraries in a lib64 subdirectory. bz 1756 Checksums: ========== - SHA1 openssh-5.6.tar.gz = fa5ac394b874d6709031306b6ac5c48399697f7f - SHA1 openssh-5.6p1.tar.gz = 347dd39c91c3529f41dae63714d452fb95efea1e Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.5 was released on 2010-04-16. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html This is a bugfix release. Changes since OpenSSH 5.4 ========================= Unbreak sshd config's AuthorizedKeysFile option for $HOME-relative paths Fix compilation failures on platforms that lack dlopen Include a language tag when sending a protocol 2 disconnection message. Make logging of certificates used for user authentication more clear and consistent between CAs specified using TrustedUserCAKeys and authorized keys Portable OpenSSH: Allow contrib/ssh-copy-id to fail gracefully when there are no keys in the ssh-agent. bz 1723 Explicitly link libX11 into contrib/gnome-ssh-askpass2. bz 1725 Allow ChrootDirectory to work in SELinux platforms. bz 1726 Add configure.ac stanza for Haiku OS. bz 1741 Enable utmpx support on FreeBSD where possible. bz 1732 Use pkg-config to determine libedit linker flags where possible. bz 1744 Checksums: ========== - SHA1 openssh-5.5.tar.gz = 59864a048b09ad1b6e65a74d5d385d8189ab8c74 - SHA1 openssh-5.5p1.tar.gz = 361c6335e74809b26ea096b34062ba8ff6c97cd6 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.4 was released on 2010-03-08. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html This is a major feature and bugfix release. Changes since OpenSSH 5.3 ========================= Features: After a transition period of about 10 years, this release disables SSH protocol 1 by default. Clients and servers that need to use the legacy protocol must explicitly enable it in ssh config / sshd config or on the command-line. Remove the libsectok/OpenSC-based smartcard code and add support for PKCS 11 tokens. This support is automatically enabled on all platforms that support dlopen 3 and was inspired by patches written by Alon Bar-Lev. Details in the ssh 1 and ssh-add 1 manpages. Add support for certificate authentication of users and hosts using a new, minimal OpenSSH certificate format not X.509 . Certificates contain a public key, identity information and some validity constraints and are signed with a standard SSH public key using ssh-keygen 1 . CA keys may be marked as trusted in authorized keys or via a TrustedUserCAKeys option in sshd config 5 for user authentication , or in known hosts for host authentication . Documentation for certificate support may be found in ssh-keygen 1 , sshd 8 and ssh 1 and a description of the protocol extensions in PROTOCOL.certkeys. Added a 'netcat mode' to ssh 1 : "ssh -W host:port ..." This connects stdio on the client to a single port forward on the server. This allows, for example, using ssh as a ProxyCommand to route connections via intermediate servers. bz 1618 Add the ability to revoke keys in sshd 8 and ssh 1 . User keys may be revoked using a new sshd config 5 option "RevokedKeys". Host keys are revoked through known hosts details in the sshd 8 man page . Revoked keys cannot be used for user or host authentication and will trigger a warning if used. Rewrite the ssh 1 multiplexing support to support non-blocking operation of the mux master, improve the resilience of the master to malformed messages sent to it by the slave and add support for requesting port- forwardings via the multiplex protocol. The new stdio-to-local forward mode "ssh -W host:port ..." is also supported. The revised multiplexing protocol is documented in the file PROTOCOL.mux in the source distribution. Add a 'read-only' mode to sftp-server 8 that disables open in write mode and all other fs-modifying protocol methods. bz 430 Allow setting an explicit umask on the sftp-server 8 commandline to override whatever default the user has. bz 1229 Many improvements to the sftp 1 client, many of which were implemented by Carlos Silva through the Google Summer of Code program: - Support the "-h" human-readable units flag for ls - Implement tab-completion of commands, local and remote filenames - Support most of scp 1 's commandline arguments in sftp 1 , as a first step towards making sftp 1 a drop-in replacement for scp 1 . Note that the rarely-used "-P sftp server path" option has been moved to "-D sftp server path" to make way for "-P port" to match scp 1 . - Add recursive transfer support for get/put and on the commandline New RSA keys will be generated with a public exponent of RSA F4 == 2 16 +1 == 65537 instead of the previous value 35. Passphrase-protected SSH protocol 2 private keys are now protected with AES-128 instead of 3DES. This applied to newly-generated keys as well as keys that are reencrypted e.g. by changing their passphrase . Bugfixes: Hold authentication debug messages until after successful authentication. Fixes a minor information leak of environment variables specified in authorized keys if an attacker happens to know the public key in use. When using ChrootDirectory, make sure we test for the existence of the user's shell inside the chroot and not outside bz 1679 Cache user and group name lookups in sftp-server using user from ug id 3 to improve performance on hosts where these operations are slow e.g. NIS or LDAP . bz 1495 Fix problem that prevented passphrase reading from being interrupted in some circumstances; bz 1590 Ignore and log any Protocol 1 keys where the claimed size is not equal to the actual size. Make HostBased authentication work with a ProxyCommand. bz 1569 Avoid run-time failures when specifying hostkeys via a relative path by prepending the current working directory in these cases. bz 1290 Do not prompt for a passphrase if we fail to open a keyfile, and log the reason why the open failed to debug. bz 1693 Document that the PubkeyAuthentication directive is allowed in a sshd config 5 Match block. bz 1577 When converting keys, truncate key comments at 72 chars as per RFC4716. bz 1630 Do not allow logins if /etc/nologin exists but is not readable by the user logging in. Output a debug log if sshd 8 can't open an existing authorized keys. bz 1694 Quell tc gs etattr warnings when forcing a tty ssh -tt , since we usually don't actually have a tty to read/set; bz 1686 Prevent sftp from crashing when given a "-" without a command. Also, allow whitespace to follow a "-". bz 1691 After sshd receives a SIGHUP, ignore subsequent HUPs while sshd re-execs itself. Prevents two HUPs in quick succession from resulting in sshd dying. bz 1692 Clarify in sshd config 5 that StrictModes does not apply to ChrootDirectory. Permissions and ownership are always checked when chrooting. bz 1532 Set close-on-exec on various descriptors so they don't get leaked to child processes. bz 1643 Fix very rare race condition in x11/agent channel allocation: don't read after the end of the select read/write fdset and make sure a reused FD is not touched before the pre-handlers are called. Fix incorrect exit status when multiplexing and channel ID 0 is recycled. bz 1570 Fail with an error when an attempt is made to connect to a server with ForceCommand=internal-sftp with a shell session i.e. not a subsystem session . Avoids stuck client when attempting to ssh to such a service. bz 1606: Warn but do not fail if stat ing the subsystem binary fails. This helps with chrootdirectory+forcecommand=sftp-server and restricted shells. bz 1599 Change "Connecting to host..." message to "Connected to host." and delay it until after the sftp protocol connection has been established. Avoids confusing sequence of messages when the underlying ssh connection experiences problems. bz 1588 Use the HostKeyAlias rather than the hostname specified on the commandline when prompting for passwords. bz 1039 Correct off-by-one in percent expand : we would fatal when trying to expand EXPAND MAX KEYS, allowing only EXPAND MAX KEYS-1 to actually work. Note that nothing in OpenSSH actually uses close to this limit at present. bz 1607 Fix passing of empty options from scp 1 and sftp 1 to the underlying ssh 1 . Also add support for the stop option "--". Fix an incorrect magic number and typo in PROTOCOL; bz 1688 Don't escape backslashes when displaying the SSH2 banner. bz 1533 Don't unnecessarily dup the in and out fds for sftp-server. bz 1566 Force use of the correct hash function for random-art signature display as it was inheriting the wrong one when bubblebabble signatures were activated. bz 1611 Do not fall back to adding keys without constraints ssh-add -c / -t ... when the agent refuses the constrained add request. bz 1612 Fix a race condition in ssh-agent that could result in a wedged or spinning agent. bz 1633 Flush stdio before exec to ensure that everying motd in particular has made it out before the streams go away. bz 1596 Set FD CLOEXEC on in/out sockets in sshd 8 . bz 1706 Portable OpenSSH Bugfixes: Use system's kerberos principal name on AIX if it's available. bz 1583 Disable OOM-killing of the listening sshd on Linux. bz 1470 Use pkg-config for opensc config if it's available. bz 1160 Unbreak Redhat spec to allow building without askpass. bz 1677 If PidFile is set in sshd config, use it in SMF init file. bz 1628 Print error and usage when ssh-rand-helper is passed command- line arguments as none are supported. bz 1568 Add missing setsockopt to set IPV6 V6ONLY for local forwarding with GatwayPorts=yes. bz 1648 Make GNOME 2 askpass dialog desktop-modal. bz 1645 If SELinux is enabled set the security context to "sftpd t" before running the internal sftp server. bz 1637 Correctly check libselinux for necessary SELinux functions; bz 1713 Unbreak builds on Redhat using the supplied openssh.spec; bz 1731 Fix incorrect privilege dropping order on AIX that prevented chroot operation; bz 1567 Call aix setauthdb/aix restoredb at the correct times on AIX to prevent authentication failure; bz 1710 Checksums: ========== - SHA1 openssh-5.4.tar.gz = 1776832d902f7b4c7863afd41a5ec7a14efe95d6 - SHA1 openssh-5.4p1.tar.gz = 2a3042372f08afb1415ceaec8178213276a36302 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.3 was released on 2009-10-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. This release marks the 10th anniversary of the OpenSSH project. We would like to thank the OpenSSH community for their support, especially those who will continue to contribute code or patches, report bugs, test snapshots or donate to the project during the next 10 years. More information on donations may be found at: http://www.openssh.com/donations.html This is a bugfix release, no new features have been added. Changes since OpenSSH 5.2 ========================= General Bugfixes: Do not limit home directory paths to 256 characters. bz 1615 Several minor documentation and correctness fixes. Portable OpenSSH Bugfixes: This release removes for support for very old versions of Cygwin and for Windows 95/98/ME Move the deletion of PAM credentials on logout to after the session close. bz 1534 Make PrintLastLog work on AIX. bz 1595 Avoid compile errors on FreeBSD from conflicts in glob.h. bz 1634 Delay dropping of root privileges on AIX so chroot and pam open session work correctly. bz 1249 and bz 1567 Increase client IO buffer on Cygwin to 64K, realising a significant performance improvement. Roll back bz 1241 better handling for expired passwords on Tru64 . The change broke password logins on some configurations. Accept ENOSYS as a fallback error when attempting atomic rename . bz 1535 Fix passing of variables to recursive make 1 invocations on Solaris. bz 1505 Skip the tcgetattr call on the pty master on Solaris, since it never succeeds and can hang if large amounts of data is sent to the slave eg a copy-paste . bz 1528 Fix detection of krb5-config. bz 1639 Fix test for server-assigned remote forwarding port for non-root users. bz 1578 Fix detection of libresolv on OSX 10.6. Checksums: ========== - SHA1 openssh-5.3.tar.gz = f1b9a280565e916c1f84fd4d944313ec926242a2 - SHA1 openssh-5.3p1.tar.gz = d411fde2584ef6022187f565360b2c63a05602b5 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.2 was released on 2009-02-23. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We have also recently completed another Internet SSH usage scan, the results of which may be found at http://www.openssh.com/usage.html Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html The focus of this release has been on bugfixes as the previous openssh-5.1 release introduced many new features and made some invasive changes. Changes since OpenSSH 5.1 ========================= Security: This release changes the default cipher order to prefer the AES CTR modes and the revised "arcfour256" mode to CBC mode ciphers that are susceptible to CPNI-957037 "Plaintext Recovery Attack Against SSH". This release also adds countermeasures to mitigate CPNI-957037-style attacks against the SSH protocol's use of CBC-mode ciphers. Upon detection of an invalid packet length or Message Authentication Code, ssh/sshd will continue reading up to the maximum supported packet length rather than immediately terminating the connection. This eliminates most of the known differences in behaviour that leaked information about the plaintext of injected data which formed the basis of this attack. We believe that these attacks are rendered infeasible by these changes. New features: Added a -y option to ssh 1 to force logging to syslog rather than stderr, which is useful when running daemonised ssh -f The sshd config 5 ForceCommand directive now accepts commandline arguments for the internal-sftp server. The ssh 1 ~C escape commandline now support runtime creation of dynamic -D port forwards. Support the SOCKS4A protocol in ssh 1 dynamic -D forwards. bz 1482 Support remote port forwarding with a listen port of '0'. This informs the server that it should dynamically allocate a listen port and report it back to the client. bz 1003 sshd 8 now supports setting PermitEmptyPasswords and AllowAgentForwarding in Match blocks Bug and documentation fixes Repair a ssh 1 crash introduced in openssh-5.1 when the client is sent a zero-length banner bz 1496 Due to interoperability problems with certain broken SSH implementations, the eow@openssh.com and no-more-sessions@openssh.com protocol extensions are now only sent to peers that identify themselves as OpenSSH. Make ssh 1 send the correct channel number for SSH2 MSG CHANNEL SUCCESS and SSH2 MSG CHANNEL FAILURE messages to avoid triggering 'Non-public channel' error messages on sshd 8 in openssh-5.1. Avoid printing 'Non-public channel' warnings in sshd 8 , since the ssh 1 has sent incorrect channel numbers since ~2004 this reverts a behaviour introduced in openssh-5.1 . Avoid double-free in ssh 1 ~C escape -L handler bz 1539 Correct fail-on-error behaviour in sftp 1 batchmode for remote stat operations. bz 1541 Disable nonfunctional ssh 1 ~C escape handler in multiplex slave connections. bz 1543 Avoid hang in ssh 1 when attempting to connect to a server that has MaxSessions=0 set. Multiple fixes to sshd 8 configuration test -T mode Several core and portable OpenSSH bugs fixed: 1380, 1412, 1418, 1419, 1421, 1490, 1491, 1492, 1514, 1515, 1518, 1520, 1538, 1540 Many manual page improvements. Checksums: ========== - SHA1 openssh-5.2.tar.gz = 260074ed466e95f054ac05a4406f613d08575217 - SHA1 openssh-5.2p1.tar.gz = 8273a0237db98179fbdc412207ff8eb14ff3d6de Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.1 was released on 2008-07-22. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We have also recently completed another Internet SSH usage scan, the results of which may be found at http://www.openssh.com/usage.html Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots or donated to the project. More information on donations may be found at: http://www.openssh.com/donations.html Changes since OpenSSH 5.0 ========================= Security: sshd 8 : Avoid X11 man-in-the-middle attack on HP/UX and possibly other platforms when X11UseLocalhost=no When attempting to bind 2 to a port that has previously been bound with SO REUSEADDR set, most operating systems check that either the effective user-id matches the previous bind common on BSD-derived systems or that the bind addresses do not overlap Linux and Solaris . Some operating systems, such as HP/UX, do not perform these checks and are vulnerable to an X11 man-in-the-middle attack when the sshd config 5 option X11UseLocalhost has been set to "no" - an attacker may establish a more-specific bind, which will be used in preference to sshd's wildcard listener. Modern BSD operating systems, Linux, OS X and Solaris implement the above checks and are not vulnerable to this attack, nor are systems where the X11UseLocalhost has been left at the default value of "yes". Portable OpenSSH 5.1 avoids this problem for all operating systems by not setting SO REUSEADDR when X11UseLocalhost is set to no. This vulnerability was reported by sway2004009 AT hotmail.com. New features: Introduce experimental SSH Fingerprint ASCII Visualisation to ssh 1 and ssh-keygen 1 . Visual fingerprinnt display is controlled by a new ssh config 5 option "VisualHostKey". The intent is to render SSH host keys in a visual form that is amenable to easy recall and rejection of changed host keys. This technique inspired by the graphical hash visualisation schemes known as "random art ", and by Dan Kaminsky's musings at 23C3 in Berlin. Fingerprint visualisation in is currently disabled by default, as the algorithm used to generate the random art is still subject to change. "Hash Visualization: a New Technique to improve Real-World Security", Perrig A. and Song D., 1999, International Workshop on Cryptographic Techniques and E-Commerce CrypTEC '99 http://sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf sshd config 5 now supports CIDR address/masklen matching in "Match address" blocks, with a fallback to classic wildcard matching. For example: Match address 192.0.2.0/24,3ffe:ffff::/32, 10. PasswordAuthentication yes sshd 8 now supports CIDR matching in ~/.ssh/authorized keys from="..." restrictions, also with a fallback to classic wildcard matching. Added an extended test mode -T to sshd 8 to request that it write its effective configuration to stdout and exit. Extended test mode also supports the specification of connection parameters username, source address and hostname to test the application of sshd config 5 Match rules. ssh 1 now prints the number of bytes transferred and the overall connection throughput for SSH protocol 2 sessions when in verbose mode previously these statistics were displayed for protocol 1 connections only . sftp-server 8 now supports extension methods statvfs@openssh.com and fstatvfs@openssh.com that implement statvfs 2 -like operations. bz 1399 sftp 1 now has a "df" command to the sftp client that uses the statvfs@openssh.com to produce a df 1 -like display of filesystem space and inode utilisation requires statvfs@openssh.com support on the server Added a MaxSessions option to sshd config 5 to allow control of the number of multiplexed sessions supported over a single TCP connection. This allows increasing the number of allowed sessions above the previous default of 10, disabling connection multiplexing MaxSessions=1 or disallowing login/shell/subsystem sessions entirely MaxSessions=0 . Added a no-more-sessions@openssh.com global request extension that is sent from ssh 1 to sshd 8 when the client knows that it will never request another session i.e. when session multiplexing is disabled . This allows a server to disallow further session requests and terminate the session in cases where the client has been hijacked. ssh-keygen 1 now supports the use of the -l option in combination with -F to search for a host in ~/.ssh/known hosts and display its fingerprint. ssh-keyscan 1 now defaults to "rsa" protocol 2 keys, instead of "rsa1". Added an AllowAgentForwarding option to sshd config 8 to control whether authentication agent forwarding is permitted. Note that this is a loose control, as a client may install their own unofficial forwarder. ssh 1 and sshd 8 : avoid unnecessary malloc/copy/free when receiving network data, resulting in a ~10% speedup ssh 1 and sshd 8 will now try additional addresses when connecting to a port forward destination whose DNS name resolves to more than one address. The previous behaviour was to try the only first address and give up if that failed. bz 383 ssh 1 and sshd 8 now support signalling that channels are half-closed for writing, through a channel protocol extension notification "eow@openssh.com". This allows propagation of closed file descriptors, so that commands such as: "ssh -2 localhost od /bin/ls | true" do not send unnecessary data over the wire. bz 85 sshd 8 : increased the default size of ssh protocol 1 ephemeral keys from 768 to 1024 bits. When ssh 1 has been requested to fork after authentication "ssh -f" with ExitOnForwardFailure enabled, delay the fork until after replies for any -R forwards have been seen. Allows for robust detection of -R forward failure when using -f. bz 92 "Match group" blocks in sshd config 5 now support negation of groups. E.g. "Match group staff, guests" bz 1315 sftp 1 and sftp-server 8 now allow chmod-like operations to set set ug id/sticky bits. bz 1310 The MaxAuthTries option is now permitted in sshd config 5 match blocks. Multiplexed ssh 1 sessions now support a subset of the ~ escapes that are available to a primary connection. bz 1331 ssh 1 connection multiplexing will now fall back to creating a new connection in most error cases. bz 1439 bz 1329 Added some basic interoperability tests against Twisted Conch. Documented OpenSSH's extensions to and deviations from the published SSH protocols the PROTOCOL file in the distribution Documented OpenSSH's ssh-agent protocol PROTOCOL.agent . Bug and documentation fixes Make ssh 1 deal more gracefully with channel requests that fail. Previously it would optimistically assume that requests would always succeed, which could cause hangs if they did not e.g. when the server runs out of file descriptors . bz 1384 ssh 1 now reports multiplexing errors via the multiplex slave's stderr where possible subject to LogLevel in the mux master . ssh 1 and sshd 8 now send terminate protocol banners with CR+LF for protocol 2 to comply with RFC 4253. Previously they were terminated with CR alone. Protocol 1 banners remain CR terminated. bz 1443 Merged duplicate authentication file checks in sshd 8 and refuse to read authorised keys and .shosts from non-regular files. bz 1438 Ensure that sshd 8 's umask disallows at least group and world write, even if a more permissive one has been inherited. bz 1433 Suppress the warning message from sshd 8 when changing to a non-existent user home directory after chrooting. bz 1461 Mention that scp 1 follows symlinks when performing recursive copies. bz 1466 Prevent sshd 8 from erroneously applying public key restrictions leaned from ~/.ssh/authorized keys to other authentication methods when public key authentication subsequently fails. bz 1472 Fix protocol keepalive timeouts - in some cases, keepalive packets were being sent, but the connection was not being closed when the limit for missing replies was exceeded. bz 1465 Fix ssh 1 sending invalid TTY modes when a TTY was forced ssh -tt but stdin was not a TTY. bz 1199 ssh 1 will now exit with a non-zero exit status if ExitOnForwardFailure was set and forwardings were disabled due to a failed host key check. Fix MaxAuthTries tests to disallow a free authentication try to clients that skipped the protocol 2 "none" authentication method. part of bz 1432 Make keepalive timeouts apply while synchronously waiting for a packet, particularly during key renegotiation. bz 1363 sshd 8 has been audited to eliminate fd leaks and calls to fatal in conditions of file descriptor exhaustion. Portable OpenSSH-specific bugfixes Avoid a sshd 8 hang-on-exit on Solaris caused by depending on the success of isatty on a PTY master undefined behaviour . Probably affected other platforms too. bz 1463 Fixed test for locked accounts on HP/UX with shadowed passwords disabled. bz 1083 Disable poll fallback in atomiciov for Tru64. readv doesn't seem to be a comparable object there, which lead to compilation errors. bz 1386 Fall back to racy rename if link returns EXDEV. bz 1447 Explicitly handle EWOULDBLOCK wherever we handle EAGAIN, on some platforms HP nonstop it is a distinct errno. bz 1467 Avoid NULL dereferences in ancient sigaction replacement code. bz 1240 Avoid linking against libgssapi, which despite its name doesn't seem to implement all of GSSAPI. bz 1276 Use explicit noreturn attribute instead of dead, fixing compilation problems on Interix. bz 1112 Added support password expiry on Tru64 SIA systems. bz 1241 Fixed an UMAC alignment problem that manifested on Itanium platforms. bz 1462 The sftp-server 8 manual now describes the requirements for transfer logging in chroot environments. bz 1488 Strip trailing dot from hostnames when the sshd config 5 HostbasedUsesNameFromPacketOnly option is set. bz 1200 Checksums: ========== - SHA1 openssh-5.1.tar.gz = 1e5b43844ed015e4fbbbe25cfad6f5377c60e759 - SHA1 openssh-5.1p1.tar.gz = 877ea5b283060fe0160e376ea645e8e168047ff5 Reporting Bugs: =============== - Please read http://www.openssh.com/report.html Security bugs should be reported directly to openssh@openssh.com OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 5.0 was released on 2008-04-03. It is available from the mirrors listed at https://www.openssh.com/. We apologise for any inconvenience resulting from this release being made so shortly after 4.9. Unfortunately we only learned of the below security issue from the public CVE report. The Debian OpenSSH maintainers responsible for handling the initial report of this bug failed to report it via either the private OpenSSH security contact list openssh@openssh.com or the portable OpenSSH Bugzilla http://bugzilla.mindrot.org/ . We ask anyone wishing to report security bugs in OpenSSH to please use the openssh@openssh.com contact and to practice responsible disclosure. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.9: ============================ Security: CVE-2008-1483: Avoid possible hijacking of X11-forwarded connections by refusing to listen on a port unless all address families bind successfully. Checksums: ========== - SHA1 openssh-5.0.tar.gz = 729fb3168edf6a68408223b5ed82e59d13b57c47 - SHA1 openssh-5.0p1.tar.gz = 121cea3a730c0b0353334b6f46f438de30ab4928 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.9 was released on 2008-03-31. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Note that OpenSSH 4.8 was an OpenBSD-only release shipped with the OpenBSD 4.3 CD. Changes since OpenSSH 4.7: ============================ Security: Disable execution of ~/.ssh/rc for sessions where a command has been forced by the sshd config ForceCommand directive. Users who had write access to this file could use it to execute abritrary commands. This behaviour was documented, but was an unsafe default and an extra hassle for administrators. New features: Added chroot 2 support for sshd 8 , controlled by a new option "ChrootDirectory". Please refer to sshd config 5 for details, and please use this feature carefully. bz 177 bz 1352 Linked sftp-server 8 into sshd 8 . The internal sftp server is used when the command "internal-sftp" is specified in a Subsystem or ForceCommand declaration. When used with ChrootDirectory, the internal sftp server requires no special configuration of files inside the chroot environment. Please refer to sshd config 5 for more information. Added a "no-user-rc" option for authorized keys to disable execution of ~/.ssh/rc Added a protocol extension method "posix-rename@openssh.com" for sftp-server 8 to perform POSIX atomic rename operations. bz 1400 Removed the fixed limit of 100 file handles in sftp-server 8 . The server will now dynamically allocate handles up to the number of available file descriptors. bz 1397 ssh 8 will now skip generation of SSH protocol 1 ephemeral server keys when in inetd mode and protocol 2 connections are negotiated. This speeds up protocol 2 connections to inetd-mode servers that also allow Protocol 1 bz 440 Accept the PermitRootLogin directive in a sshd config 5 Match block. Allows for, e.g. permitting root only from the local network. Reworked sftp 1 argument splitting and escaping to be more internally consistent i.e. between sftp commands and more consistent with sh 1 . Please note that this will change the interpretation of some quoted strings, especially those with embedded backslash escape sequences. bz 778 Support "Banner=none" in sshd config 5 to disable sending of a pre-login banner e.g. in a Match block . ssh 1 ProxyCommands are now executed with $SHELL rather than /bin/sh. ssh 1 's ConnectTimeout option is now applied to both the TCP connection and the SSH banner exchange previously it just covered the TCP connection . This allows callers of ssh 1 to better detect and deal with stuck servers that accept a TCP connection but don't progress the protocol, and also makes ConnectTimeout useful for connections via a ProxyCommand. Many new regression tests, including interop tests against PuTTY's plink. Support BSM auditing on Mac OS X The following bugs have been fixed in this release: - scp 1 incorrectly reported "stalled" on slow copies. bz 799 - scp 1 date underflow for timestamps before epoch. bz 828 - scp 1 and sftp 1 progressmeter type fixes. bz 842 - SSH2 MSG UNIMPLEMENTED packets did not correctly reset the client keepalive logic, causing disconnections on servers that did not explicitly implement "keepalive@openssh.com". bz 1307 - ssh 1 used the obsolete SIG DNS RRtype for host keys in DNS, instead of the current standard RRSIG. bz 1317 - Extract magic buffer size constants in scp 1 to defines. bz 1333 - Correctly drain ACKs when a sftp 1 upload write fails midway, avoids a fatal exit from what should be a recoverable condition. bz 1354 - Avoid pointer arithmetic and strict aliasing warnings. bz 1355 - Fixed packet size advertisements. Previously TCP and agent forwarding incorrectly advertised the channel window size as the packet size, causing fatal errors under some conditions. bz 1360 - Document KbdInteractiveAuthentication in sshd config 5 . bz 1367 - Fixed sftp 1 file handle leak on download when the local file could not be opened. bz 1375 - Fixed ssh-keygen 1 selective host key hashing i.e. "ssh-keygen -HF hostname" to not include any IP address in the data to be hashed. bz 1376 - Fix clobbering of struct passwd from multiple getpwid calls, resulting in fatal errors inside tilde expand filename. bz 1377 - Fix parsing of port-forwarding specifications to correctly detect errors in either specified port number. bz 1378 - Fix memory leak in ssh 1 ~ escape commandline handling. bz 1379 - Make ssh 1 skip listening on the IPv6 wildcard address when a binding address of 0.0.0.0 is used against an old SSH server that does not support the RFC4254 syntax for wildcard bind addresses. bz 1381 - Remove extra backslashes in the RB PROTOTYPE macro definition. bz 1385 - Support ssh 1 RekeyLimits up to the maximum allowed by the protocol: 2 32-1. bz 1390 - Enable IPV6 V6ONLY socket option on sshd 8 listen socket, as is already done for X11/TCP forwarding sockets. bz 1392 - Fix FD leak that could hang a ssh 1 connection multiplexing master. bz 1398 - Improve error messages when hostname resolution fails due to a system error. bz 1417 - Make ssh 1 -q option documentation consistent with reality. bz 1427 bz 1429 Portable OpenSSH bugs fixed: - Fixed sshd 8 PAM support not calling pam session close , or failing to call it with root privileges. bz 926 - Made sshd 8 use configuration-specified SyslogFacility for hosts access 3 messages for denied connections. bz 1042 - Implement getgrouplist 3 for AIX, enabling NSS LDAP to work on this platform. bz 1081 - Fix compilation errors on AIX due to misdefinition of LLONG MAX. bz 1347 - Force use of local glob 3 implementation on Mac OS X and FreeBSD, as the platform versions lack features or have unexpected behaviour. bz 1407 - Reduce stdout/stderr noise from ssh-copy-id. bz 1431 - Fix activation of OpenSSL engine support when requested in configure. bz 1437 Checksums: ========== - SHA1 openssh-4.9.tar.gz = fa7d1b3dcb093bd0dfc643b33b1a57a26f459373 - SHA1 openssh-4.9p1.tar.gz = 91575878883065bd777f82b47e0d481ac69ee7fe Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.8 was an OpenBSD-only release, included on the OpenBSD 4.3 CD only. Changes since OpenSSH 4.8: ============================ New features: Added chroot 2 support for sshd 8 , controlled by a new option "ChrootDirectory". Please refer to sshd config 5 for details, and please use this feature carefully. bz 177 bz 1352 Linked sftp-server 8 into sshd 8 . The internal sftp server is used when the command "internal-sftp" is specified in a Subsystem or ForceCommand declaration. When used with ChrootDirectory, the internal sftp server requires no special configuration of files inside the chroot environment. Please refer to sshd config 5 for more information. Added a protocol extension method "posix-rename@openssh.com" for sftp-server 8 to perform POSIX atomic rename operations. bz 1400 Removed the fixed limit of 100 file handles in sftp-server 8 . The server will now dynamically allocate handles up to the number of available file descriptors. bz 1397 ssh 8 will now skip generation of SSH protocol 1 ephemeral server keys when in inetd mode and protocol 2 connections are negotiated. This speeds up protocol 2 connections to inetd-mode servers that also allow Protocol 1 bz 440 Accept the PermitRootLogin directive in a sshd config 5 Match block. Allows for, e.g. permitting root only from the local network. Reworked sftp 1 argument splitting and escaping to be more internally consistent i.e. between sftp commands and more consistent with sh 1 . Please note that this will change the interpretation of some quoted strings, especially those with embedded backslash escape sequences. bz 778 Support "Banner=none" in sshd config 5 to disable sending of a pre-login banner e.g. in a Match block . ssh 1 ProxyCommands are now executed with $SHELL rather than /bin/sh. ssh 1 's ConnectTimeout option is now applied to both the TCP connection and the SSH banner exchange previously it just covered the TCP connection . This allows callers of ssh 1 to better detect and deal with stuck servers that accept a TCP connection but don't progress the protocol, and also makes ConnectTimeout useful for connections via a ProxyCommand. Many new regression tests, including interop tests against PuTTY's plink. Support BSM auditing on Mac OS X The following bugs have been fixed in this release: - scp 1 incorrectly reported "stalled" on slow copies. bz 799 - scp 1 date underflow for timestamps before epoch. bz 828 - scp 1 and sftp 1 progressmeter type fixes. bz 842 - SSH2 MSG UNIMPLEMENTED packets did not correctly reset the client keepalive logic, causing disconnections on servers that did not explicitly implement "keepalive@openssh.com". bz 1307 - ssh 1 used the obsolete SIG DNS RRtype for host keys in DNS, instead of the current standard RRSIG. bz 1317 - Extract magic buffer size constants in scp 1 to defines. bz 1333 - Correctly drain ACKs when a sftp 1 upload write fails midway, avoids a fatal exit from what should be a recoverable condition. bz 1354 - Avoid pointer arithmetic and strict aliasing warnings. bz 1355 - Fixed packet size advertisements. Previously TCP and agent forwarding incorrectly advertised the channel window size as the packet size, causing fatal errors under some conditions. bz 1360 - Document KbdInteractiveAuthentication in sshd config 5 . bz 1367 - Fixed sftp 1 file handle leak on download when the local file could not be opened. bz 1375 - Fixed ssh-keygen 1 selective host key hashing i.e. "ssh-keygen -HF hostname" to not include any IP address in the data to be hashed. bz 1376 - Fix clobbering of struct passwd from multiple getpwid calls, resulting in fatal errors inside tilde expand filename. bz 1377 - Fix parsing of port-forwarding specifications to correctly detect errors in either specified port number. bz 1378 - Fix memory leak in ssh 1 ~ escape commandline handling. bz 1379 - Make ssh 1 skip listening on the IPv6 wildcard address when a binding address of 0.0.0.0 is used against an old SSH server that does not support the RFC4254 syntax for wildcard bind addresses. bz 1381 - Remove extra backslashes in the RB PROTOTYPE macro definition. bz 1385 - Support ssh 1 RekeyLimits up to the maximum allowed by the protocol: 2 32-1. bz 1390 - Enable IPV6 V6ONLY socket option on sshd 8 listen socket, as is already done for X11/TCP forwarding sockets. bz 1392 - Fix FD leak that could hang a ssh 1 connection multiplexing master. bz 1398 - Improve error messages when hostname resolution fails due to a system error. bz 1417 - Make ssh 1 -q option documentation consistent with reality. bz 1427 bz 1429 Portable OpenSSH bugs fixed: - Fixed sshd 8 PAM support not calling pam session close , or failing to call it with root privileges. bz 926 - Made sshd 8 use configuration-specified SyslogFacility for hosts access 3 messages for denied connections. bz 1042 - Implement getgrouplist 3 for AIX, enabling NSS LDAP to work on this platform. bz 1081 - Fix compilation errors on AIX due to misdefinition of LLONG MAX. bz 1347 - Force use of local glob 3 implementation on Mac OS X and FreeBSD, as the platform versions lack features or have unexpected behaviour. bz 1407 - Reduce stdout/stderr noise from ssh-copy-id. bz 1431 - Fix activation of OpenSSL engine support when requested in configure. bz 1437 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.7 was released on 2007-09-05. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.6: ============================ Security bugs resolved in this release: Prevent ssh 1 from using a trusted X11 cookie if creation of an untrusted cookie fails; found and fixed by Jan Pechanec. Other changes, new functionality and fixes in this release: sshd 8 in new installations defaults to SSH Protocol 2 only. Existing installations are unchanged. The SSH channel window size has been increased, and both ssh 1 sshd 8 now send window updates more aggressively. These improves performance on high-BDP Bandwidth Delay Product networks. ssh 1 and sshd 8 now preserve MAC contexts between packets, which saves 2 hash calls per packet and results in 12-16% speedup for arcfour256/hmac-md5. A new MAC algorithm has been added, UMAC-64 RFC4418 as "umac-64@openssh.com". UMAC-64 has been measured to be approximately 20% faster than HMAC-MD5. A -K flag was added to ssh 1 to set GSSAPIAuthentication=Yes Failure to establish a ssh 1 TunnelForward is now treated as a fatal error when the ExitOnForwardFailure option is set. ssh 1 returns a sensible exit status if the control master goes away without passing the full exit status. bz 1261 The following bugs have been fixed in this release: - When using a ProxyCommand in ssh 1 , set the outgoing hostname with gethostname 2 , allowing hostbased authentication to work bz 616 - Make scp 1 skip FIFOs rather than hanging bz 856 - Encode non-printing characters in scp 1 filenames. these could cause copies to be aborted with a "protocol error" bz 891 - Handle SIGINT in sshd 8 privilege separation child process to ensure that wtmp and lastlog records are correctly updated bz 1196 - Report GSSAPI mechanism in errors, for libraries that support multiple mechanisms bz 1220 - Improve documentation for ssh-add 1 's -d option bz 1224 - Rearrange and tidy GSSAPI code, removing server-only code being linked into the client. bz 1225 - Delay execution of ssh 1 's LocalCommand until after all forwadings have been established. bz 1232 - In scp 1 , do not truncate non-regular files bz 1236 - Improve exit message from ControlMaster clients. bz 1262 - Prevent sftp-server 8 from reading until it runs out of buffer space, whereupon it would exit with a fatal error. bz 1286 Portable OpenSSH bugs fixed: - Fix multiple inclusion of paths.h on AIX 5.1 systems. bz 1243 - Implement getpeereid for Solaris using getpeerucred. Solaris systems will now refuse ssh-agent 1 and ssh 1 ControlMaster clients from different, non-root users bz 1287 - Fix compilation warnings by including string.h if found. bz 1294 - Remove redefinition of res in getrrsetbyname.c for platforms that already define it. bz 1299 - Fix spurious "chan read failed for istate 3" errors from sshd 8 , a side-effect of the "hang on exit" fix introduced in 4.6p1. bz 1306 - pam end was not being called if authentication failed bz 1322 - Fix SELinux support when SELinux is in permissive mode. Previously sshd 8 was treating SELinux errors as always fatal. bz 1325 - Ensure that pam setcred ..., PAM ESTABLISH CRED is called before pam setcred ..., PAM REINITIALIZE CRED , fixing pam dhkeys. bz 1339 - Fix privilege separation on QNX - pre-auth only, this platform does not support file descriptior passing needed for post-auth privilege separation. bz 1343 Thanks to everyone who has contributed patches, reported bugs and tested releases. Checksums: ========== - SHA1 openssh-4.7.tar.gz = 9ebaab9b31e01bd0d04425dc23536bcc78f8d990 - SHA1 openssh-4.7p1.tar.gz = 58357db9e64ba6382bef3d73d1d386fcdc0508f4 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.6 was released on 2007-03-09. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.5: ============================ sshd now allows the enabling and disabling of authentication methods on a per user, group, host and network basis via the Match directive in sshd config. The following bugs have been fixed in this release: - Clear SIGALRM when restarting due to SIGHUP. Prevents stray signal from taking down sshd if a connection was pending at the time SIGHUP was received - sftp returned a zero exit status when upload failed due to write errors bugzilla 1252 - fixed an inconsistent check for a terminal when displaying scp progress meter bugzilla 1265 - Parsing of time values in Match blocks was incorrectly applied to the global configuration bugzilla 1275 - Allow multiple forwarding options to work when specified in a PermitOpen directive bugzilla 1267 - Interoperate with ssh.com versions that do not support binding remote port forwarding sessions to a hostname bugzilla 1019 Portable OpenSSH bugs fixed: - "hang on exit" when background processes are running at the time of exit on a ttyful/login session bugzilla 52 - Fix typos in the ssh-rand-helper 8 man page bugzilla 1259 - Check that some SIG records have been returned in getrrsetbyname bugzilla 1281 - Fix contrib/findssl for platforms that lack "which" bugzilla 1237 - Work around bug in OpenSSL 0.9.8e that broke aes256-ctr, aes192-ctr, arcfour256 bugzilla 1291 Checksums: ========== - SHA1 openssh-4.6.tar.gz = c1700845be464a769428f34ef727c1f530728afc - SHA1 openssh-4.6p1.tar.gz = b2aefeb1861b4688b1777436035239ec32a47da8 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.5 was released on 2006-11-07. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.4: ============================ This is a bugfix only release. No new features have been added. Security bugs resolved in this release: Fix a bug in the sshd privilege separation monitor that weakened its verification of successful authentication. This bug is not known to be exploitable in the absence of additional vulnerabilities. This release includes the following non-security fixes: Several compilation fixes for portable OpenSSH Fixes to Solaris SMF/process contract support bugzilla 1255 Thanks to everyone who has contributed patches, reported bugs and tested releases. Checksums: ========== - SHA1 openssh-4.5.tar.gz = def3de1557181062d788695b9371d02635af39fb - SHA1 openssh-4.5p1.tar.gz = 2eefcbbeb9e4fa16fa4500dec107d1a09d3d02d7 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.4 was released on 2006-09-27. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.3: ============================ Security bugs resolved in this release: Fix a pre-authentication denial of service found by Tavis Ormandy, that would cause sshd 8 to spin until the login grace time expired. Fix an unsafe signal handler reported by Mark Dowd. The signal handler was vulnerable to a race condition that could be exploited to perform a pre-authentication denial of service. On portable OpenSSH, this vulnerability could theoretically lead to pre-authentication remote code execution if GSSAPI authentication is enabled, but the likelihood of successful exploitation appears remote. On portable OpenSSH, fix a GSSAPI authentication abort that could be used to determine the validity of usernames on some platforms. This release includes the following new functionality and fixes: Implemented conditional configuration in sshd config 5 using the "Match" directive. This allows some configuration options to be selectively overridden if specific criteria based on user, group, hostname and/or address are met. So far a useful subset of post- authentication options are supported and more are expected to be added in future releases. Add support for Diffie-Hellman group exchange key agreement with a final hash of SHA256. Added a "ForceCommand" directive to sshd config 5 . Similar to the command="..." option accepted in ~/.ssh/authorized keys, this forces the execution of the specified command regardless of what the user requested. This is very useful in conjunction with the new "Match" option. Add a "PermitOpen" directive to sshd config 5 . This mirrors the permitopen="..." authorized keys option, allowing fine-grained control over the port-forwardings that a user is allowed to establish. Add optional logging of transactions to sftp-server 8 . ssh 1 will now record port numbers for hosts stored in ~/.ssh/authorized keys when a non-standard port has been requested. Add an "ExitOnForwardFailure" option to cause ssh 1 to exit with a non-zero exit code when requested port forwardings could not be established. Extend sshd config 5 "SubSystem" declarations to allow the specification of command-line arguments. Replacement of all integer overflow susceptible invocations of malloc 3 and realloc 3 with overflow-checking equivalents. Many manpage fixes and improvements New portable OpenSSH-specific features: - Add optional support for SELinux, controlled using the --with-selinux configure option experimental - Add optional support for Solaris process contracts, enabled using the --with-solaris-contracts configure option experimental This option will also include SMF metadata in Solaris packages built using the "make package" target - Add optional support for OpenSSL hardware accelerators engines , enabled using the --with-ssl-engine configure option. Bugs from http://bugzilla.mindrot.org fixed: 482 - readconf doesn't accept paths with spaces in them. 906 - syslog messages from sshd net lost. 975 - Kerberos authentication timing can leak information about account validity. 981 - Flow stop in SSH2. 1102 - C program 'write' with zero length hangs. 1129 - sshd hangs for command-only invocations due to fork/child signals. 1131 - error "buffer append space:alloc not supported" 1138 - Passphrase asked for but ignored if key file permissions too liberal.. 1156 - Closes connection after C-c is pressed on QNX. 1157 - ssh-keygen doesn't handle DOS line breaks. 1159 - %u and %h not handled in IdentityFile. 1161 - scp -r fails. 1162 - Inappropriate sequence of syslog messages. 1166 - openssh-4.3p1 has some issues compiling. 1171 - configure can't always figure out LLONG MAX.. 1173 - scp reports lost connection for very large files. 1177 - Incorrect sshrc file location in Makefile.in. 1179 - sshd incorrectly rejects connections due to IP options. 1181 - configure should detect when openssl-0.9.8x needs -ldl. 1186 - ssh tries multiple times to open unprotected keys. 1188 - keyboard-interactive should not allow retry after pam acct mgmt fails. 1193 - Open ssh will not allow changing of passwords on usernames greater than 8 characters.. 1201 - Bind address information is not specified in command line help messages. 1203 - configure.ac is missing an open . 1207 - sshd does not clear unsuccessful login count on non-interactive logins. 1218 - GSSAPI client code permits SPNEGO usage. 1221 - Banner only suppressed at log level = QUIET used to be at log level < INFO . Fixes to memory and file descriptor leaks reported by the Coverity static analysis tool Fixes to inconsistent pointer checks reported by the Stanford SATURN tool Thanks to everyone who has contributed patches, reported bugs and tested releases. Checksums: ========== - SHA1 openssh-4.4.tar.gz = 2294b5e5a591420aa05ff607c1890ab622ace878 - SHA1 openssh-4.4p1.tar.gz = 6a52b1dee1c2c9862923c0008d201d98a7fd9d6c Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. Portable OpenSSH 4.3p2 was released on 2006-02-11. It will be available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We have also recently completed another Internet SSH usage scan, the results of which may be found at http://www.openssh.com/usage.html Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since Portable OpenSSH 4.3p1: ==================================== This is a release of Portable OpenSSH only, to resolve some portability bugs. There are no new features, only fixes: Explicitly test for egrep in ./configure, fixing a problem in 4.3p1 that caused some platforms to fail to detect the available fields in utmp/wtmp/lastlog records. This bug manifested as missing or empty login/logout records as seen by last 1 , etc. Fix for logout records not being updated on platforms without support for post-authentication privilege separation e.g. Cygwin Fixed compilation problems on Ultrix, NewsOS and QNX Thanks to everyone who has contributed patches, reported bugs or test releases. Checksums: ========== - SHA1 openssh-4.3p2.tar.gz = 2b5b0751fd578283ba7b106025c0ba391fd72f1f Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.3 was released on 2006-02-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We have also recently completed another Internet SSH usage scan, the results of which may be found at http://www.openssh.com/usage.html Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed code or patches, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.2: ============================ Security bugs resolved in this release: CVE-2006-0225: scp as does rcp, on which it is based invoked a subshell to perform local to local, and remote to remote copy operations. This subshell exposed filenames to shell expansion twice; allowing a local attacker to create filenames containing shell metacharacters that, if matched by a wildcard, could lead to execution of attacker-specified commands with the privilege of the user running scp Bugzilla 1094 This is primarily a bug-fix release, only one new feature has been added: Add support for tunneling arbitrary network packets over a connection between an OpenSSH client and server via tun 4 virtual network interfaces. This allows the use of OpenSSH 4.3+ to create a true VPN between the client and server providing real network connectivity at layer 2 or 3. This feature is experimental and is currently supported on OpenBSD, Linux, NetBSD IPv4 only and FreeBSD. Other operating systems with tun/tap interface capability may be added in future portable OpenSSH releases. Please refer to the README.tun file in the source distribution for further details and usage examples. Some of the other bugs resolved and internal improvements are: Reduce default key length for new DSA keys generated by ssh-keygen back to 1024 bits. DSA is not specified for longer lengths and does not fully benefit from simply making keys longer. As per FIPS 186-2 Change Notice 1, ssh-keygen will refuse to generate a new DSA key smaller or larger than 1024 bits Fixed X forwarding failing to start when a the X11 client is executed in background at the time of session exit Bugzilla 1086 Change ssh-keygen to generate a protocol 2 RSA key when invoked without arguments Bugzilla 1064 Fix timing variance for valid vs. invalid accounts when attempting Kerberos authentication Bugzilla 975 Ensure that ssh always returns code 255 on internal error Bugzilla 1137 Cleanup wtmp files on SIGTERM when not using privsep Bugzilla 1029 Set SO REUSEADDR on X11 listeners to avoid problems caused by lingering sockets from previous session X11 applications can sometimes not connect to 127.0.0.1:60xx Bugzilla 1076 Ensure that fds 0, 1 and 2 are always attached in all programs, by duping /dev/null to them if necessary. Xauth list invocation had bogus "." argument Bugzilla 1082 Remove internal assumptions on key exchange hash algorithm and output length, preparing OpenSSH for KEX methods with alternate hashes. Ignore junk sent by a server before it sends the "SSH-" banner Bugzilla 1067 The manpages has been significantly improves and rearranged, in addition to other specific manpage fixes: 1037 - Man page entries for -L and -R should mention -g. 1077 - Descriptions for "ssh -D" and DynamicForward should mention they can specify "bind address" optionally. 1088 - Incorrect descriptions in ssh config man page for ControlMaster=no. 1121 - Several corrections for ssh agent manpages Lots of cleanups, including fixes to memory leaks on error paths Bugzilla 1109, 1110, 1111 and more and possible crashes 1092 Portable OpenSSH-specific fixes: - Pass random seed during re-exec for each connection: speeds up processing of new connections on platforms using the OpenSSH's builtin entropy collector ssh-rand-helper - PAM fixes and improvements: 1045 - Missing option for ignoring the /etc/nologin file 1087 - Show PAM password expiry message from LDAP on login 1028 - Forward final non-query conversations to client 1126 - Prevent user from being forced to change an expired password repeatedly on AIX in some PAM configurations. 1045 - Do not check /etc/nologin when PAM is enabled, instead allow PAM to handle it. Note that on platforms using PAM, the pam nologin module should be used in sshd's session stack in order to maintain past behaviour - Portability-related fixes: 989 - Fix multiplexing regress test on Solaris 1097 - Cross-compile fixes. 1096 - ssh-keygen broken on HPUX. 1098 - $MAIL being set incorrectly for HPUX server login. 1104 - Compile error on Tru64 Unix 4.0f 1106 - Updated .spec file and startup for SuSE. 1122 - Use GNU SOURCE define in favor of USE GNU, fixing compilation problems on glibc 2.4 Thanks to everyone who has contributed patches, reported bugs or test releases. Checksums: ========== - SHA1 openssh-4.3.tar.gz = 0cb66e56805d66b51511455423bab88aa58a1455 - SHA1 openssh-4.3p1.tar.gz = b1f379127829e7e820955b2825130edd1601ba59 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Darren Tucker, Jason McIntyre, Tim Rice and Ben Lindstrom. OpenSSH 4.2 was released on 2005-09-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support of the project, especially those who contributed source, reported bugs, tested snapshots and purchased T-shirts or posters. T-shirt, poster and CD sales directly support the project. Pictures and more information can be found at: http://www.openbsd.org/tshirts.html and http://www.openbsd.org/orders.html For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.1: ============================ - SECURITY: Fix a bug introduced in OpenSSH 4.0 that caused GatewayPorts to be incorrectly activated for dynamic "-D" port forwardings when no listen address was explicitly specified. - SECURITY: sshd in OpenSSH versions prior to 4.2 allow GSSAPI credentials to be delegated to users who log in with methods other than GSSAPI authentication e.g. public key when the client requests it. This behaviour has been changed in OpenSSH 4.2 to only delegate credentials to users who authenticate using the GSSAPI method. This eliminates the risk of credentials being inadvertently exposed to an untrusted user/host though users should not activate GSSAPIDelegateCredentials to begin with when the remote user or host is untrusted - Added a new compression method that delays the start of zlib compression until the user has been authenticated successfully. The new method "Compression delayed" is on by default in the server. This eliminates the risk of any zlib vulnerability leading to a compromise of the server from unauthenticated users. NB. Older OpenSSH <3.5 versions have a bug that will cause them to refuse to connect to any server that does not offer compression when the client has compression requested. Since the new "delayed" server mode isn't supported by these older clients, they will refuse to connect to a new server unless compression is disabled on the client end or the original compression method is enabled on the server "Compression yes" in sshd config - Another round of proactive changes for signed vs unsigned integer bugs has been completed, including changing the atomicio API to encourage safer programming. This work is ongoing. - Added support for the improved arcfour cipher modes from draft-harris-ssh-arcfour-fixes-02. The improves the cipher's resistance to a number of attacks by discarding early keystream output. - Increase the default size of new RSA/DSA keys generated by ssh-keygen from 1024 to 2048 bits. - Many bugfixes and improvements to connection multiplexing, including: - Added ControlMaster=auto/autoask options to support opportunistic multiplexing see the ssh config 5 manpage for details . - The client will now gracefully fallback to starting a new TCP connection if it cannot connect to a specified multiplexing control socket - Added %h target hostname , %p target port and %r remote username expansion sequences to ControlPath. Also allow ControlPath=none to disable connection multiplexing. - Implemented support for X11 and agent forwarding over multiplexed connections. Because of protocol limitations, the slave connections inherit the master's DISPLAY and SSH AUTH SOCK rather than distinctly forwarding their own. - Portable OpenSSH: Added support for long passwords 8-char on UnixWare 7. - The following bugs from http://bugzilla.mindrot.org/ were closed: 471 - Misleading error message if /dev/tty perms wrong 623 - Don't use $HOME in manpages 829 - Don't allocate a tty if -n option is set 1025 - Correctly handle disabled special character in ttymodes 1033 - Fix compile-time warnings 1046 - AIX 5.3 Garbage on Login 1054 - Don't terminate connection on getpeername failure 1076 - GSSAPIDelegateCredentials issue mentioned above - Lots of other improvements and fixes. Please refer to the ChangeLog for details Thanks to everyone who has contributed patches, problem or test reports. Checksums: ========== - SHA1 openssh-4.2.tar.gz = d2bd777986a30e446268ceeb24cddbf2edf51b21 - SHA1 openssh-4.2p1.tar.gz = 5e7231cfa8ec673ea856ce291b78fac8b380eb78 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 4.1 was released on 2005-05-26. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 4.0: ============================ This is a bugfix release, no new features have been added. Some notable fixes are: - Fix segfault when using forwardings configured in ssh config 5 and ClearAllForwardings bugzilla 996 - Limit input buffer size for channels. A peer could send more data than the buffer code was willing to accept. This would cause OpenSSH to abort the connection bugzilla 896 Several improvements to the regression tests Portable OpenSSH: - OpenSSH will now always normalise IPv4 in IPv6 mapped addresses back to IPv4 addresses. This means that IPv4 addresses in log messages on IPv6 enabled machines will no longer be prefixed by "::ffff:" and AllowUsers, DenyUsers, AllowGroups, DenyGroups will match IPv4-style addresses only for 4-in-6 mapped connections. This ensures a consistent representation of IPv4 addresses regardless of whether or not the machine is IPv6 enabled. Other bugfixes, including bugzilla 950, 997, 998, 999, 1005, 1006, 1024, and 1038 Changes since OpenSSH 3.9: ============================ ssh 1 now allows the optional specification of an address to bind to in port forwarding connections local, remote and dynamic . Please refer to the documentation for the -L and -R options in the ssh 1 manual page and the LocalForward and RemoteForward options in the ssh config 5 manpage. Bugzilla 413 To control remote bindings while retaining backwards compatibility, sshd 8 's GatewayPorts option has been extended. To allow client specified bind addresses for remote -R port forwardings, the server must be configured with "GatewayPorts clientspecified". ssh 1 and ssh-keyscan 1 now support hashing of host names and addresses added to known hosts files, controlled by the ssh 1 HashKnownHosts configuration directive. This option improves user privacy by hiding which hosts have been visited. At present this option is off by default, but may be turned on once it receives sufficient testing. Added options for managing keys in known hosts files to ssh-keygen 1 , including the ability to search for hosts by name, delete hosts by name and convert an unhashed known hosts file into one with hashed names. These are particularly useful for managing known hosts files with hashed hostnames. Improve account and password expiry support in sshd 8 . Ther server will now warn in advance for both account and password expiry. sshd 8 will now log the source of connections denied by AllowUsers, DenyUsers, AllowGroups and DenyGroups Bugzilla 909 Added AddressFamily option to sshd 8 to allow global control over IPv4/IPv6 usage. Bugzilla 989 Improved sftp 1 client, including bugfixes and optimisations for the ls'' command and command history and editing support using libedit. Improved the handling of bad data in authorized keys files, eliminating fatal errors on corrupt or very large keys. Bugzilla 884 Improved connection multiplexing support in ssh 1 . Several bugs have been fixed and a new "command mode" has been added to allow the control of a running multiplexing master connection, including checking that it is up, determining its PID and asking it to exit. Have scp 1 and sftp 1 wait for the spawned ssh to exit before they exit themselves. This prevents ssh from being unable to restore terminal modes not normally a problem on OpenBSD but common with -Portable on POSIX platforms . Bugzilla 950 Portable OpenSSH: - Add EXPERIMENTAL BSM audit support for Solaris systems Bugzilla 125 - Enable IPv6 on AIX where possible see README.platform for details , working around a misfeature of AIX's getnameinfo. Bugzilla 835 - Teach sshd 8 to write failed login records to btmp for unsuccessful auth attempts. Currently this is only for password, keyboard-interactive and challenge/response authentication methods and only on Linux and HP-UX. - sshd 8 now sends output from failing PAM session modules to the user before exiting, similar to the way /etc/nologin is handled - Store credentials from gssapi-with-mic authentication early enough to be available to PAM session modules when privsep=yes. Checksums: ========== - SHA1 openssh-4.1.tar.gz = 62fc9596b20244bb559d5fee3ff3ecc0dfd557cb - SHA1 openssh-4.1p1.tar.gz = e85d389da8ad8290f5031b8f9972e2623c674e46 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 4.0 was released on 2005-03-09. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 3.9: ============================ ssh 1 now allows the optional specification of an address to bind to in port forwarding connections local, remote and dynamic . Please refer to the documentation for the -L and -R options in the ssh 1 manual page and the LocalForward and RemoteForward options in the ssh config 5 manpage. Bugzilla 413 To control remote bindings while retaining backwards compatibility, sshd 8 's GatewayPorts option has been extended. To allow client specified bind addresses for remote -R port forwardings, the server must be configured with "GatewayPorts clientspecified". ssh 1 and ssh-keyscan 1 now support hashing of host names and addresses added to known hosts files, controlled by the ssh 1 HashKnownHosts configuration directive. This option improves user privacy by hiding which hosts have been visited. At present this option is off by default, but may be turned on once it receives sufficient testing. Added options for managing keys in known hosts files to ssh-keygen 1 , including the ability to search for hosts by name, delete hosts by name and convert an unhashed known hosts file into one with hashed names. These are particularly useful for managing known hosts files with hashed hostnames. Improve account and password expiry support in sshd 8 . Ther server will now warn in advance for both account and password expiry. sshd 8 will now log the source of connections denied by AllowUsers, DenyUsers, AllowGroups and DenyGroups Bugzilla 909 Added AddressFamily option to sshd 8 to allow global control over IPv4/IPv6 usage. Bugzilla 989 Improved sftp 1 client, including bugfixes and optimisations for the ls'' command and command history and editing support using libedit. Improved the handling of bad data in authorized keys files, eliminating fatal errors on corrupt or very large keys. Bugzilla 884 Improved connection multiplexing support in ssh 1 . Several bugs have been fixed and a new "command mode" has been added to allow the control of a running multiplexing master connection, including checking that it is up, determining its PID and asking it to exit. Have scp 1 and sftp 1 wait for the spawned ssh to exit before they exit themselves. This prevents ssh from being unable to restore terminal modes not normally a problem on OpenBSD but common with -Portable on POSIX platforms . Bugzilla 950 Portable OpenSSH: - Add EXPERIMENTAL BSM audit support for Solaris systems Bugzilla 125 - Enable IPv6 on AIX where possible see README.platform for details , working around a misfeature of AIX's getnameinfo. Bugzilla 835 - Teach sshd 8 to write failed login records to btmp for unsuccessful auth attempts. Currently this is only for password, keyboard-interactive and challenge/response authentication methods and only on Linux and HP-UX. - sshd 8 now sends output from failing PAM session modules to the user before exiting, similar to the way /etc/nologin is handled - Store credentials from gssapi-with-mic authentication early enough to be available to PAM session modules when privsep=yes. Checksums: ========== - MD5 openssh-4.0.tgz = 7dbf15fe7c294672e8822127f50107d0 - MD5 openssh-4.0p1.tar.gz = 7b36f28fc16e1b7f4ba3c1dca191ac92 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 3.9 was released on 2004-08-18. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 3.8: ============================ Added new "IdentitiesOnly" option to ssh 1 , which specifies that it should use keys specified in ssh config, rather than any keys in ssh-agent 1 Make sshd 8 re-execute itself on accepting a new connection. This security measure ensures that all execute-time randomisations are reapplied for each connection rather than once, for the master process' lifetime. This includes mmap and malloc mappings, shared library addressing, shared library mapping order, ProPolice and StackGhost cookies on systems that support such things Add strict permission and ownership checks to programs reading ~/.ssh/config NB ssh 1 will now exit instead of trying to process a config with poor ownership or permissions Implemented the ability to pass selected environment variables between the client and the server. See "AcceptEnv" in sshd config 5 and "SendEnv" in ssh config 5 for details Added a "MaxAuthTries" option to sshd 8 , allowing control over the maximum number of authentication attempts permitted per connection Added support for cancellation of active remote port forwarding sessions. This may be performed using the ~C escape character, see "Escape Characters" in ssh 1 for details Many sftp 1 interface improvements, including greatly enhanced "ls" support and the ability to cancel active transfers using SIGINT ^C Implement session multiplexing: a single ssh 1 connection can now carry multiple login/command/file transfer sessions. Refer to the "ControlMaster" and "ControlPath" options in ssh config 5 for more information The sftp-server has improved support for non-POSIX filesystems e.g. FAT Portable OpenSSH: Re-introduce support for PAM password authentication, in addition to the keyboard-interactive driver. PAM password authentication is less flexible, and doesn't support pre-authentication password expiry but runs in-process so Kerberos tokens, etc are retained Improved and more extensive regression tests Many bugfixes and small improvements Checksums: ========== - MD5 openssh-3.9.tgz = 93f48bfcc1560895ae53de6bfc41689b - MD5 openssh-3.9p1.tar.gz = 8e1774d0b52aff08f817f3987442a16e Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 3.8.1p1 was released on 2004-04-19. It is available from the mirrors listed at https://www.openssh.com/. This release is a bug-fix release for the portable version. There are no feature additions and no corresponding OpenBSD-only release. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source, help with testing and have bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Bugs fixed since OpenSSH 3.8p1: =============================== Bug 673 - Fix compilation on NetBSD with S/Key enabled Bug 748 - Detect and workaround broken name resolution on HP-UX Bug 802 - Fix linking on Tru64 when compiled with SIA support Bug 808 - Fix PAM crash on expired password when not authenticated using pam/kbdint mechanism Bug 810 - Fix erroneous clearing of TZ environment variable Bug 811 - Improve locked password detection across Linux variants Bug 820 - Fix utmp corruption on Irix Bug 825 - Fix disconnection problem when using IPv4-in-IPv6 mapped addresses on Solaris. - Fix compilation on OS X systems with Kerberos/GSSAPI - Many more minor fixes, please refer to the ChangeLog file for details Checksums: ========== - MD5 openssh-3.8.1p1.tar.gz = 1dbfd40ae683f822ae917eebf171ca42 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. 3.8.1p1 is a Portable-only release, there is no corresponding 3.8.1 release. See http://www.openssh.com/txt/release-3.8.1p1 for the Portable release notes. OpenSSH 3.8 was released on 2004-02-24. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 3.7.1: ============================ sshd 8 now supports forced changes of expired passwords via /usr/bin/passwd or keyboard-interactive authentication. Note for AIX: sshd will now deny password access to accounts with passwords expired longer than their maxexpired attribute. For details, see the AIX section in README.platform. ssh 1 now uses untrusted cookies for X11-Forwarding. Some X11 applications might need full access to the X11 server, see ForwardX11Trusted in ssh 1 and xauth 1 for more information. ssh 1 now supports sending application layer keep-alive messages to the server. See ServerAliveInterval in ssh 1 for more information. Improved sftp 1 batch file support. New KerberosGetAFSToken option for sshd 8 . Updated /etc/moduli file and improved performance for protocol version 2. Support for host keys in DNS draft-ietf-secsh-dns-xx.txt . Please see README.dns in the source distribution for details. Fix a number of memory leaks. The experimental "gssapi" support has been replaced with the "gssapi-with-mic" to fix possible MITM attacks. The two versions are not compatible. Checksums: ========== - MD5 openssh-3.8.tgz = 7d5590a333d8f8aa1fa6f19e24938700 - MD5 openssh-3.8p1.tar.gz = 7861a4c0841ab69a6eec5c747daff6fb Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. Portable OpenSSH 3.7.1p2 was released on 2003-09-23. It will be available from the mirrors listed at http://www.openssh.com/portable.html shortly. Please note that this is a release to address issues in the portable version only. The items mentioned below do not affect the OpenBSD version. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Security Changes: ================= Portable OpenSSH version 3.7p1 and 3.7.1p1 contain multiple vulnerabilities in the new PAM authentication code. At least one of these bugs is remotely exploitable under a non-standard configuration, with privsep disabled . OpenSSH 3.7.1p2 fixes these bugs. Please note that these bugs do not exist in OpenBSD's releases of OpenSSH. Changes since OpenSSH 3.7.1p1: ============================== This release disables PAM by default. To enable it, set "UsePAM yes" in sshd config. Due to complexity, inconsistencies in the specification and differences between vendors' PAM implementations we recommend that PAM be left disabled in sshd config unless there is a need for its use. Sites using only public key or simple password authentication usually have little need to enable PAM support. This release now requires zlib 1.1.4 to build correctly. Previous versions have security problems. Fix compilation for versions of OpenSSL before 0.9.6. Some cipher modes are not supported for older OpenSSL versions. Fix compilation problems on systems with a missing or lacking inet ntoa function. Workaround problems related to unimplemented or broken setresuid/setreuid functions on several platforms. Fix compilation on older OpenBSD systems. Fix handling of password-less authentication PermitEmptyPasswords=yes that has not worked since the 3.7p1 release. Checksums: ========== - MD5 openssh-3.7.1p2.tar.gz = 61cf5b059938718308836d00f6764a94 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 3.7.1 was released on 2004-02-25. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use https://https.openbsd.org/cgi-bin/order and for European orders, use https://https.openbsd.org/cgi-bin/order.eu Security Changes: ================= All versions of OpenSSH's sshd prior to 3.7.1 contain buffer management errors. It is uncertain whether these errors are potentially exploitable, however, we prefer to see bugs fixed proactively. OpenSSH 3.7 fixed one of these bugs. OpenSSH 3.7.1 fixes more similar bugs. Changes since OpenSSH 3.6.1: ============================ The entire OpenSSH code-base has undergone a license review. As a result, all non-ssh1.x code is under a BSD-style license with no advertising requirement. Please refer to README in the source distribution for the exact license terms. Rhosts authentication has been removed in ssh 1 and sshd 8 . Changes in Kerberos support: - KerberosV password support now uses a file cache instead of a memory cache. - KerberosIV and AFS support has been removed. - KerberosV support has been removed from SSH protocol 1. - KerberosV password authentication support remains for SSH protocols 1 and 2. - This release contains some GSSAPI user authentication support to replace legacy KerberosV authentication support. At present this code is still considered experimental and SHOULD NOT BE USED. Changed order that keys are tried in public key authentication. The ssh 1 client tries the keys in the following order: 1. ssh-agent 1 keys that are found in the ssh config 5 file 2. remaining ssh-agent 1 keys 3. keys that are only listed in the ssh config 5 file This helps when an ssh-agent 1 has many keys, where the sshd 8 server might close the connection before the correct key is tried. SOCKS5 support has been added to the dynamic forwarding mode in ssh 1 . Removed implementation barriers to operation of SSH over SCTP. sftp 1 client can now transfer files with quote characters in their filenames. Replaced sshd 8 's VerifyReverseMapping with UseDNS option. When UseDNS option is on, reverse hostname lookups are always performed. Fix a number of memory leaks. Support for sending tty BREAK over SSH protocol 2. Workaround for other vendor bugs in KEX guess handling. Support for generating KEX-GEX groups /etc/moduli in ssh-keygen 1 . Automatic re-keying based on amount of data sent over connection. New AddressFamily option on client to select protocol to use IPv4 or IPv6 . Experimental support for the "aes128-ctr", "aes192-ctr", and "aes256-ctr" ciphers for SSH protocol 2. Experimental support for host keys in DNS draft-ietf-secsh-dns-xx.txt . Please see README.dns in the source distribution for details. Portable OpenSSH: - Replace PAM password authentication kludge with a more correct PAM challenge-response module from FreeBSD. - PAM support may now be enabled/disabled at runtime using the UsePAM directive. - Many improvements to the OpenSC smartcard support. - Regression tests now work with portable OpenSSH. Please refer to regress/README.regress in the source distribution. - On platforms that support it, portable OpenSSH now honors the UMASK, PATH and SUPATH attributes set in /etc/default/login. - Deny access to locked accounts, regardless of authentication method in use. Checksums: ========== - MD5 openssh-3.7.1.tgz = 3d2f1644d6a3d3267e5e2421f1385129 - MD5 openssh-3.7.1p1.tar.gz = f54e574e606c08ef63ebb1ab2f7689dc Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 3.7 was released on 2003-09-16. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Security Changes: ================= All versions of OpenSSH's sshd prior to 3.7 contain a buffer management error. It is uncertain whether this error is potentially exploitable, however, we prefer to see bugs fixed proactively. OpenSSH 3.7 fixes this bug. Changes since OpenSSH 3.6.1: ============================ The entire OpenSSH code-base has undergone a license review. As a result, all non-ssh1.x code is under a BSD-style license with no advertising requirement. Please refer to README in the source distribution for the exact license terms. Rhosts authentication has been removed in ssh 1 and sshd 8 . Changes in Kerberos support: - KerberosV password support now uses a file cache instead of a memory cache. - KerberosIV and AFS support has been removed. - KerberosV support has been removed from SSH protocol 1. - KerberosV password authentication support remains for SSH protocols 1 and 2. - This release contains some GSSAPI user authentication support to replace legacy KerberosV authentication support. At present this code is still considered experimental and SHOULD NOT BE USED. Changed order that keys are tried in public key authentication. The ssh 1 client tries the keys in the following order: 1. ssh-agent 1 keys that are found in the ssh config 5 file 2. remaining ssh-agent 1 keys 3. keys that are only listed in the ssh config 5 file This helps when an ssh-agent 1 has many keys, where the sshd 8 server might close the connection before the correct key is tried. SOCKS5 support has been added to the dynamic forwarding mode in ssh 1 . Removed implementation barriers to operation of SSH over SCTP. sftp 1 client can now transfer files with quote characters in their filenames. Replaced sshd 8 's VerifyReverseMapping with UseDNS option. When UseDNS option is on, reverse hostname lookups are always performed. Fix a number of memory leaks. Support for sending tty BREAK over SSH protocol 2. Workaround for other vendor bugs in KEX guess handling. Support for generating KEX-GEX groups /etc/moduli in ssh-keygen 1 . Automatic re-keying based on amount of data sent over connection. New AddressFamily option on client to select protocol to use IPv4 or IPv6 . Experimental support for the "aes128-ctr", "aes192-ctr", and "aes256-ctr" ciphers for SSH protocol 2. Experimental support for host keys in DNS draft-ietf-secsh-dns-xx.txt . Please see README.dns in the source distribution for details. Portable OpenSSH: - Replace PAM password authentication kludge with a more correct PAM challenge-response module from FreeBSD. - PAM support may now be enabled/disabled at runtime using the UsePAM directive. - Many improvements to the OpenSC smartcard support. - Regression tests now work with portable OpenSSH. Please refer to regress/README.regress in the source distribution. - On platforms that support it, portable OpenSSH now honors the UMASK, PATH and SUPATH attributes set in /etc/default/login. - Deny access to locked accounts, regardless of authentication method in use. Checksums: ========== - MD5 openssh-3.7.tgz = 86864ecc276c5f75b06d4872a553fa70 - MD5 openssh-3.7p1.tar.gz = 77662801ba2a9cadc0ac10054bc6cb37 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice. OpenSSH 3.6.1p2 was released on 2003-04-30. It is available from the mirrors listed at https://www.openssh.com/.This is a release of the Portable version only. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Changes since OpenSSH 3.6.1p1: ============================ Security: corrected linking problem on AIX/gcc. AIX users are advised to upgrade immediately. For details, please refer to separate advisory aixgcc.adv . Corrected build problems on Irix Corrected build problem when building with AFS support Merged some changes from Openwall Linux Checksums: ========== - MD5 openssh-3.6p1.tar.gz = f3879270bffe479e1bd057aa36258696 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.6.1 was released on 2003-04-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 3.6: ========================== The 'kex guesses' bugfix from OpenSSH 3.6 triggers a bug in a few other SSH v2 implementations and causes connections to stall. OpenSSH 3.6.1 disables this bugfix when interoperating with these implementations. Changes between OpenSSH 3.5 and OpenSSH 3.6: ============================================ RSA blinding is now used by ssh 1 , sshd 8 and ssh-agent 1 . in order to avoid potential timing attacks against the RSA keys. Older versions of OpenSSH have been using RSA blinding in ssh-keysign 1 only. Please note that there is no evidence that the SSH protocol is vulnerable to the OpenSSL/TLS timing attack described in http://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf ssh-agent 1 optionally requires user confirmation if a key gets used, see '-c' in ssh-add 1 . sshd 8 now handles PermitRootLogin correctly when UsePrivilegeSeparation is enabled. sshd 8 now removes X11 cookies when a session gets closed. ssh-keysign 8 is disabled by default and only enabled if the new EnableSSHKeysign option is set in the global ssh config 5 file. ssh 1 and sshd 8 now handle 'kex guesses' correctly key exchange guesses . ssh 1 no longer overwrites SIG IGN. This matches behaviour from rsh 1 and is used by backup tools. setting ProxyCommand to 'none' disables the proxy feature, see ssh config 5 . scp 1 supports add -1 and -2. scp 1 supports bandwidth limiting. sftp 1 displays a progressmeter. sftp 1 has improved error handling for scripting. Checksums: ========== - MD5 openssh-3.6.1p1.tar.gz = d4c2c88b883f097fe88e327cbb4b2e2a - MD5 openssh-3.6.1.tgz = aa2acd2be17dc3fd514a1e09336aab51 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.6 was released on 2003-03-31. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support to the project, especially those who contributed source and bought T-shirts or posters. We have a new design of T-shirt available, more info on http://www.openbsd.org/tshirts.html 18 For international orders use http://https.openbsd.org/cgi-bin/order and for European orders, use http://https.openbsd.org/cgi-bin/order.eu Changes since OpenSSH 3.5: ============================ RSA blinding is now used by ssh 1 , sshd 8 and ssh-agent 1 . in order to avoid potential timing attacks against the RSA keys. Older versions of OpenSSH have been using RSA blinding in ssh-keysign 1 only. Please note that there is no evidence that the SSH protocol is vulnerable to the OpenSSL/TLS timing attack described in http://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf ssh-agent 1 optionally requires user confirmation if a key gets used, see '-c' in ssh-add 1 . sshd 8 now handles PermitRootLogin correctly when UsePrivilegeSeparation is enabled. sshd 8 now removes X11 cookies when a session gets closed. ssh-keysign 8 is disabled by default and only enabled if the new EnableSSHKeysign option is set in the global ssh config 5 file. ssh 1 and sshd 8 now handle 'kex guesses' correctly key exchange guesses . ssh 1 no longer overwrites SIG IGN. This matches behaviour from rsh 1 and is used by backup tools. setting ProxyCommand to 'none' disables the proxy feature, see ssh config 5 . scp 1 supports add -1 and -2. scp 1 supports bandwidth limiting. sftp 1 displays a progressmeter. sftp 1 has improved error handling for scripting. Checksums: ========== - MD5 openssh-3.6p1.tar.gz = 72ef1134d521cb6926c99256dad17fe0 - MD5 openssh-3.6.tgz = 758822b888c5c3f83a98045aef904254 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.5 was released on 2002-10-15. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Changes since OpenSSH 3.4: ============================ Improved support for Privilege Separation Portability, Kerberos, PermitRootLogin handling . ssh 1 prints out all known host keys for a host if it receives an unknown host key of a different type. Fixed AES/Rijndael EVP integration for OpenSSL < 0.9.7 caused problems with bounds checking patches for gcc . ssh-keysign 8 is disabled by default and only enabled if the HostbasedAuthentication option is enabled in the global ssh config 5 file. ssh-keysign 8 uses RSA blinding in order to avoid timing attacks against the RSA host key. A use-after-free bug was fixed in ssh-keysign 8 . This bug broke hostbased authentication on several platforms. ssh-agent 1 is now installed setgid in order to avoid ptrace 2 attacks. ssh-agent 1 now restricts the access with getpeereid 2 or equivalent, where available . sshd 8 no longer uses the ASN.1 parsing code from libcrypto when verifying RSA signatures. sshd 8 now sets the SSH CONNECTION environment variable. Enhanced "ls" support for the sftp 1 client, including globbing and detailed listings. ssh 1 now always falls back to uncompressed sessions, if the server does not support compression. The default behavior of sshd 8 with regard to user settable environ variables has changed: the new option PermitUserEnvironment is disabled by default, see sshd config 5 . The default value for LoginGraceTime has been changed from 600 to 120 seconds, see sshd config 5 . Removed erroneous SO LINGER handling. Checksums: ========== - MD5 openssh-3.5p1.tar.gz = 42bd78508d208b55843c84dd54dea848 - MD5 openssh-3.5.tgz = 79fc225dbe0fe71ebb6910f449101d23 Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.4 was released on 2002-06-26. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Changes since OpenSSH 3.3: ============================ Security Changes: ================= All versions of OpenSSH's sshd between 2.9.9 and 3.3 contain an input validation error that can result in an integer overflow and privilege escalation. OpenSSH 3.4 fixes this bug. In addition, OpenSSH 3.4 adds many checks to detect invalid input and mitigate resource exhaustion attacks. OpenSSH 3.2 and later prevent privilege escalation if UsePrivilegeSeparation is enabled in sshd config. OpenSSH 3.3 enables UsePrivilegeSeparation by default. Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.3 was released on 2002-06-21. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Changes since OpenSSH 3.2.3: ============================ Security Changes: ================= - improved support for privilege separation: privilege separation is now enabled by default See UsePrivilegeSeparation in sshd config 5 and http://www.citi.umich.edu/u/provos/ssh/privsep.html for more information. - ssh no longer needs to be installed setuid root for protocol version 2 hostbased authentication, see ssh-keysign 8 . protocol version 1 rhosts-rsa authentication still requires privileges and is not recommended. Other Changes: ============== - documentation for the client and server configuration options have been moved to ssh config 5 and sshd config 5 . - the server now supports the Compression option, see sshd config 5 . - the client options RhostsRSAAuthentication and RhostsAuthentication now default to no, see ssh config 5 . - the client options FallBackToRsh and UseRsh are deprecated. - ssh-agent now supports locking and timeouts for keys, see ssh-add 1 . - ssh-agent can now bind to unix-domain sockets given on the command line, see ssh-agent 1 . - fixes problems with valid RSA signatures from putty clients. Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.2.3 was released on 2002-05-23. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Changes since OpenSSH 3.2.2: ============================ This release fixes several problems in OpenSSH 3.2.2: - a defect in the BSD AUTH access control handling for OpenBSD and BSD/OS systems: Under certain conditions, on systems using YP with netgroups in the password database, it is possible that sshd does ACL checks for the requested user name but uses the password database entry of a different user for authentication. This means that denied users might authenticate successfully while permitted users could be locked out OpenBSD PR 2659 . - login/tty problems on Solaris bug 245 - build problems on Cygwin systems Changes between OpenSSH 3.1 and OpenSSH 3.2.2: ============================================== Security Changes: ================= - fixed buffer overflow in Kerberos/AFS token passing - fixed overflow in Kerberos client code - sshd no longer auto-enables Kerberos/AFS - experimental support for privilege separation, see UsePrivilegeSeparation in sshd 8 and http://www.citi.umich.edu/u/provos/ssh/privsep.html for more information. - only accept RSA keys of size SSH RSA MINIMUM MODULUS SIZE 768 or larger Other Changes: ============== - improved smartcard support including support for OpenSC, see www.opensc.org - improved Kerberos support including support for MIT-Kerberos V - fixed stderr handling in protocol v2 - client reports failure if -R style TCP forwarding fails in protocol v2 - support configuration of TCP forwarding during interactive sessions ~C - improved support for older sftp servers - improved support for importing old DSA keys from ssh.com software . - client side suport for PASSWD CHANGEREQ in protocol v2 - fixed waitpid race conditions - record correct lastlogin time Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.2.2 was released on 2002-05-16. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Security Changes: ================= - fixed buffer overflow in Kerberos/AFS token passing - fixed overflow in Kerberos client code - sshd no longer auto-enables Kerberos/AFS - experimental support for privilege separation, see UsePrivilegeSeparation in sshd 8 and http://www.citi.umich.edu/u/provos/ssh/privsep.html for more information. - only accept RSA keys of size SSH RSA MINIMUM MODULUS SIZE 768 or larger Other Changes: ============== - improved smartcard support including support for OpenSC, see www.opensc.org - improved Kerberos support including support for MIT-Kerberos V - fixed stderr handling in protocol v2 - client reports failure if -R style TCP forwarding fails in protocol v2 - support configuration of TCP forwarding during interactive sessions ~C - improved support for older sftp servers - improved support for importing old DSA keys from ssh.com software . - client side suport for PASSWD CHANGEREQ in protocol v2 - fixed waitpid race conditions - record correct lastlogin time Reporting Bugs: =============== - please read http://www.openssh.com/report.html and http://bugzilla.mindrot.org/ OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.1 was released on 2004-04-09. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Important Changes: ================== - /etc/ssh/ now default directory for keys and configuration files - ssh-keygen no longer defaults to a specific key type rsa1 ; use ssh-keygen -t {rsa,dsa,rsa1} - sshd x11 forwarding listens on localhost by default; see sshd X11UseLocalhost option to revert to prior behaviour if your older X11 clients do not function with this configuration Other Changes: ============== - ssh ~& escape char functions now for both protocol versions - sshd ReverseMappingCheck option changed to VerifyReverseMapping to clarify its function; ReverseMappingCheck can still be used - public key fingerprint is now logged with LogLevel=VERBOSE - reason logged for disallowed logins e.g., no shell, etc. - more robust error handling for x11 forwarding - improved packet/window size handling in ssh2 - use of regex 3 has been removed - fix SIGCHLD races in sshd seen on Solaris - sshd -o option added - sftp -B -R -P options added - ssh-add now adds all 3 default keys - ssh-keyscan bug fixes - ssh-askpass for hostkey dialog - fix fd leak in sshd on SIGHUP - TCP NODELAY set on X11 and TCP forwarding endpoints OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.0.2 was released on 2002-12-04. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Important Changes: ================== This release fixes a vulnerability in the UseLogin option of OpenSSH. This option is not enabled in the default installation of OpenSSH. However, if UseLogin is enabled by the administrator, all versions of OpenSSH prior to 3.0.2 may be vulnerable to local attacks. The vulnerability allows local users to pass environment variables e.g. LD PRELOAD to the login process. The login process is run with the same privilege as sshd usually with root privilege . Do not enable UseLogin on your machines or disable UseLogin again in /etc/sshd config: UseLogin no We also have received many reports about attacks against the crc32 bug. This bug has been fixed about 12 months ago in OpenSSH 2.3.0. However, these attacks cause non-vulnerable daemons to chew a lot of cpu since the crc32 attack sends a tremendously large amount of data which must be processed. OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. The following patch fixes the UseLogin vulnerability in OpenSSH 3.0.1 and earlier releases. --- session.c 11 Oct 2001 13:45:21 -0000 1.108 +++ session.c 1 Dec 2001 22:14:39 -0000 @@ -875,6 +875,7 @@ child set env &env, &envsize, "TZ", getenv "TZ" ; / Set custom environment options from RSA authentication. / + if options.use login while custom environment { struct envstring ce = custom environment; char s = ce- s; OpenSSH 3.0.1 was released on 2001-11-19. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. We would like to thank the OpenSSH community for their continued support and encouragement. Important Changes: ================== A security hole that may allow an attacker to authenticate if -- and only if -- the administrator has enabled KerberosV. By default, OpenSSH KerberosV support only becomes active after KerberosV has been properly configured. An excessive memory clearing bug which we believe to be unexploitable also exists, but since this may cause daemon crashes, we are providing a fix as well. Various other non-critical fixes ~& support and more . OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 3.0 was released on 2001-11-06. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. This release contains many portability bug-fixes listed in the ChangeLog as well as several new features listed below . We would like to thank the OpenSSH community for their continued support and encouragement. Important Changes: ================== 1 SSH protocol v2 is now the default protocol version use the 'Protocol' option from ssh 1 and sshd 8 if you need to change this. 2 The files /etc/ssh known hosts2 ~/.ssh/known hosts2 ~/.ssh/authorized keys2 are now obsolete, you can use /etc/ssh known hosts ~/.ssh/known hosts ~/.ssh/authorized keys For backward compatibility ~/.ssh/authorized keys2 will still used for authentication and hostkeys are still read from the known hosts2. However, those deprecated files are considered 'readonly'. Future releases are likely not to read these files. 3 The CheckMail option in sshd config is deprecated, as sshd 8 no longer checks for new mail. 4 X11 cookies are now stored in $HOME. New Features: ============= 1 Smartcard support in the ssh client and agent based on work by University of Michigan CITI http://www.citi.umich.edu/projects/smartcard/ . 2 support for Rekeying in protocol version 2 3 improved Kerberos support in protocol v1 KerbIV and KerbV 4 backward compatibility with older commercial SSH versions = 2.0.10 5 getopt 3 is now used by all programs 6 dynamic forwarding use ssh 1 as your socks server 7 ClearAllForwardings in ssh 1 8 ssh 1 now checks the hostkey for localhost NoHostAuthenticationForLocalhost yes/no . 9 -F option in ssh 1 10 ssh 1 now has a '-b bindaddress' option 11 scp 1 allows "scp /file localhost:/file" 12 The AuthorizedKeysFile option allows specification of alternative files that contain the public keys that can be used for user authentication e.g. /etc/ssh keys/%u, see sshd 8 13 extended AllowUsers user@host syntax in sshd 8 14 improved challenge-response support especially for systems supporting BSD AUTH 15 sshd 8 can specify time args as 1h, 2h30s etc. 16 sshd 8 transmits the correct exit status for remote execution with protocol version 2. 17 ssh-keygen 1 can import private RSA/DSA keys generated with the commercial version 18 ssh-keyscan 1 supports protocol version 2 OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. Portable OpenSSH 2.9p2 has just been uploaded and shall be making its way to the mirrors listed at http://www.openssh.com/portable.html shortly. This release fixes the "cookies" file deletion problem reported on BUGTRAQ as well as a few other minor non-security bugs. No new features have been added in this release. Regards, Damien Miller OpenSSH 2.9.9 has just been uploaded. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH 2.9.9 fixes a weakness in the key file option handling, including source IP based access control. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. This release contains many portability bug-fixes listed in the ChangeLog as well as several new features listed below . We would like to thank the OpenSSH community for their continued support and encouragement. Security Notes: =============== This release fixes weakness in the source IP based access control for SSH protocol v2 public key authentication: Versions of OpenSSH between 2.5 and 2.9.9 are affected if they use the 'from=' key file option in combination with both RSA and DSA keys in ~/.ssh/authorized keys2. Depending on the order of the user keys in ~/.ssh/authorized keys2 sshd might fail to apply the source IP based access control restriction e.g. from="10.0.0.1" to the correct key: If a source IP restricted key e.g. DSA key is immediately followed by a key of a different type e.g. RSA key , then key options for the second key are applied to both keys, which includes 'from='. This means that users can circumvent the system policy and login from disallowed source IP addresses. Important Changes: ================== OpenSSH 2.9.9 might have upgrade issues introduced by the long time between releases, which may affect people in unforseen ways: 1 The files /etc/ssh known hosts2 ~/.ssh/known hosts2 ~/.ssh/authorized keys2 are now obsolete, you can use /etc/ssh known hosts ~/.ssh/known hosts ~/.ssh/authorized keys For backward compatibility ~/.ssh/authorized keys2 is still used for authentication and hostkeys are still read from the known hosts2. However, old files are considered 'readonly'. Future releases are likely to not read these files. 2 The CheckMail option in sshd config is deprecated, sshd no longer checks for new mail. 3 X11 cookies are stored in $HOME OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. OpenSSH 2.9 has just been uploaded. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support. This release contains many portability bug-fixes listed in the ChangeLog as well as several new features listed below . We would like to thank the OpenSSH community for their continued support and encouragement. Important Changes: ================== WARNING: SSH protocol v2 is now the default protocol version use the 'Protocol' option from ssh 1 and sshd 8 if you want to change this. SSH protocol v2 implementation adds support for: HostbasedAuthentication, similar to RhostsRSA in SSH protocol v1 Rekeying negotiate new encryption keys for the current SSH session, try ~R in interactive SSH sessions updated DH group exchange: draft-ietf-secsh-dh-group-exchange-01.txt client option HostKeyAlgorithms server options ClientAliveInterval and ClientAliveCountMax tty mode passing general: gid swapping in sshd fixes access to /home/group/user based directory structures Dan Kaminsky <dankamin@cisco.com contributed an experimental SOCKS4 proxy to the ssh client yes, client not the server . Use 'ssh -D 1080 server' if you want to try this out. server option PrintLastLog improvements for scp 2GB improved ListenAddress option. You can now use ListenAddress host:port improved interoperability bug detection for older implementations improved documentation OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. Portable OpenSSH 2.5.2p2 is now available from the mirror sites listed at http://www.openssh.com/portable.html Security related changes: Improved countermeasure against "Passive Analysis of SSH Secure Shell Traffic" http://openwall.com/advisories/OW-003-ssh-traffic-analysis.txt The countermeasures introduced in earlier OpenSSH-2.5.x versions caused interoperability problems with some other implementations. Improved countermeasure against "SSH protocol 1.5 session key recovery vulnerability" http://www.core-sdi.com/advisories/ssh1 sessionkey recovery.htm New options: permitopen authorized keys option to restrict portforwarding. PreferredAuthentications allows client to specify the order in which authentication methods are tried. Sftp: sftp client supports globbing get , put . Support for sftp protocol v3 draft-ietf-secsh-filexfer-01.txt . Batch file -b support for automated transfers Performance: Speedup DH exchange. OpenSSH should now be significantly faster when connecting use SSH protocol 2. Preferred SSH protocol 2 cipher is AES with hmac-md5. AES offers much faster throughput in a well scrutinised cipher. Bugfixes: stderr handling fixes in SSH protocol 2. Improved interoperability. Client: The client no longer asks for the passphrase if the key will not be accepted by the server SSH2 MSG USERAUTH PK OK Miscellaneous: scp should now work for files 2GB ssh-keygen can now generate fingerprints in the "bubble babble" format for exchanging fingerprints with SSH.COM's SSH protocol 2 implementation. Portable version: Better support for the PRNGd 1 entropy collection daemon. The --with-egd-pool configure option has been deprecated in favour of --with-prngd-socket and the new --with-prngd-port options. The latter allows collection of entropy from a localhost socket. configure ensures that scp is in the $PATH set by the server unless a custom path is specified . -d 1 http://www.aet.tu-cottbus.de/personen/jaenicke/postfix tls/prngd.html Portable OpenSSH 2.5.1p2 has just been uploaded and will be making its way to the mirror sites http://www.openssh.com/portable.html in due course. This release contains primarily bug-fixes over 2.5.1p1 but an upgrade is recommended. Specific bug-fixes include: - Fixed endianess issue causing failues when usin Rijndael/AES cipher - Fix PAM failures on Solaris and Linux - Fix RPM spec file for Redhat systems - Fixed several compatibility functions - Fix entropy collection code for SCO3 and NeXTStep - Many other minor fixes see Changelog for details This release includes Mark Roth's mdoc2man.pl script which can be used to fix up the manpages on systems that lack the full andoc set of macros e.g. Solaris . A future release of portable OpenSSH will automate this scripts use for systems that require it. -d Portable OpenSSH 2.5.1p1 has just been uploaded. It will be available from the mirrors listed at http://www.openssh.com/portable.html shortly. OpenSSH is a 100% complete SSH 1.3 & 1.5 protocol implementation and a 99% SSH 2 protocol implementation, including sftp client and server support. This release contains many portability bug-fixes listed in the ChangeLog as well as several new features listed below . OpenSSH 2.5.0p1 was skipped because of interoperability issues with ssh-1.2.18 = ssh-1.2.22. We would like to thank the OpenSSH community for their continued support and encouragement. Important Changes: ================== 1 Features added to the implementation of the SSH 2 protocol: agent forwarding support for -R forwarding RSA host and userkeys extended support for older SSH 2 protocol implementations OpenSSH still lacks support for rekeying, so you have to turn off rekeying if your server tries to force this feature. The next release of OpenSSH will probably support rekeying. 2 Damien Miller contributed an interactive sftp client. The sftp client works for both SSH protocol versions. 3 David Mazieres' ssh-keyscan has been added to the OpenSSH distribution. 4 Now there are three types of keys in OpenSSH: RSA1 is used by the SSH 1 protocol only, RSA and DSA keys are used by the SSH 2 protocol implementation. You can generate RSA keys for use with SSH 2 protocol with: $ ssh-keygen -t rsa -f /etc/ssh host rsa key To use RSA or DSA keys in SSH 2 protocol, simply add the public keys to the .ssh/authorised keys2 file. IdentityFile2, HostDsaKey and DSAAuthentication are obsolete: You can use multiple IdentityFile and HostKey options instead, e.g HostKey /etc/ssh host key HostKey /etc/ssh host dsa key HostKey /etc/ssh host rsa key in /etc/sshd config The option DSAAuthentication has been replaced by PubkeyAuthentication. Fingerprinting works for all types of keys: $ ssh-keygen -l -f $HOME/.ssh/{authorized keys,known hosts}{,2} 5 Important changes in the implementation of SSH 1 protocol: The OpenSSH server does not require a privileged source port for RhostsRsaAuthentication, since it adds no additional security. Interoperation with SSH 1.4 protocol 6 New option HostKeyAlias This option allows the user to record the host key under a different name. This is useful for tunneling over forwarded connections or if you run multiple sshd's on different ports on the same machine. Alternatively you can use the UserKnownHostsFile or UserKnownHostsFile2 options to specify separate host key files for the connection. 7 The ReverseMappingCheck is now optional in sshd config. If you combine this with the 'sshd -u0' option the server will not do DNS lookups when a client connects. 8 Stricter Hostkey Checking 9 Option Change Summary: a New or changed: ChallengeResponseAuthentication MACs PubkeyAuthentication HostkeyAlias Client only Banner Server only ReverseMappingCheck Server only PermitRootLogin {yes,without-password,forced-commands-only,no} {Allow,Deny}Groups now support supplementary groups sshd -D for monitoring scripts or inittab ssh -t multiple -t force tty allocation b Obsolete: DsaAuthentication use PubkeyAuthentication instead HostDsaKey use HostKey Identityfile2 use Identityfile or -i SkeyAuthentication use ChallengeResponseAuthentication TisAuthentication use ChallengeResponseAuthentication OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt, Kevin Steves, Damien Miller and Ben Lindstrom. This is to announce the release of portable openssh-2.3.0p1. This release includes many new features and bug fixes. This is a recommended upgrade if you are using 2.2.0p1 or an older release. Portable OpenSSH is available from one of the many mirrors listed at http://www.openssh.com/portable.html Some of the more notable features include: - Rijndael support for SSH2. Use the "Ciphers" configuration directive to enable it. Markus Friedl <markus@cvs.openbsd.org - Cygwin support Corinna Vinschen <vinschen@cygnus.com - sftp-server support Markus Friedl <markus@cvs.openbsd.org - SSH1 single-des support for interop with Cisco routers. This cipher is never enabled automatically, you have to either specify "-c des" or enable it using "Cipher des" in a config file. Markus Friedl <markus@cvs.openbsd.org - Support expired password change through PAM Steve VanDevender's <stevev@darkwing.uoregon.edu - Better compatibility with buggy SSH implementations Markus Friedl <markus@cvs.openbsd.org - S/key support for SSH2, based on kbd-interactive auth Markus Friedl <markus@cvs.openbsd.org and mkiernan@avantgo.com - scp now supports "-o" option Ben Lindstron <mouring@pconline.com Please refer to the ChangeLog for a full list of features and bugfixes. Regards, Damien Miller Version 2.2.0p1 of portable OpenSSH has just been uploaded to the master site and should be making its way to the mirrors in due course. http://www.openssh.com/portable.html This release contains several new features and bugfixes relative to the previous 2.1.1p4 release. In particular: - DSA key support in ssh-agent. Please not that this will not interop with ssh.com's ssh-agent Markus Friedl - sshd now implements Random Early Drop connection rate limiting, which can help mitigate DoS attacks against sshd. See the MaxStartups' option in the sshd manpage for details Markus Friedl - -u' option to sshd allow logging of hostnames rather than IP addresses in wtmp when UseLogin' is set to yes'. Markus Friedl - Escape character ~' support in SSH2 Markus Friedl - Interop with SSH.COM ssh 2.3.0 Markus Friedl - Fix problems when sshd is run from inetd - Better SunOS 4.1.x support Nate Itkin and Charles Levert - Solaris package support, see contrib/solaris Rip Loomis - Work around connection freezes on HPUX and SunOS 4 Lutz Jaenicke, Tamito KAJIYAMA - Fix ^C ignored issue on Solaris. Gert Doering, John Horne and Garrick James - Further improved NeXT support. Ben Lindstrom, Mark Miller - Lots of other minor fixes see ChangeLog for details This release has been tested on HPUX 10.20, 11.00 , Irix 5.3, 6.5 , Linux Debian, Redhat, Slackware, SuSE , NeXTstep 3 HPPA, i386, m68k , OpenStep i386, m68k, Sparc , SCO Unixware 7.1.0, SCO OpenServer 5.0.5, Solaris 2.7 Sparc , Solaris 2.8 i386, Sparc , SNI/Reliant Unix, DEC OSF/Tru64 5.0. Many thanks to those who contributed bug reports, fixes and testing time. Regards, Damien Miller I have just uploaded portable OpenSSH 2.1.1p4, it should be making its way to the mirrors listed at http://www.openssh.com/portable.html soon. This release contains several bugfixes from the OpenBSD team, primarily the config file parsing problem reported by Ralf Engelschall <rse@engelschall.com Regards, Damien Miller --------------- Changelog: 20000716 - Release 2.1.1p4 20000715 - djm OpenBSD CVS updates - provos@cvs.openbsd.org 2000/07/13 16:53:22 aux.c readconf.c servconf.c ssh.h allow multiple whitespace but only one '=' between tokens, bug report from Ralf S. Engelschall <rse@engelschall.com but different fix. okay deraadt@ - provos@cvs.openbsd.org 2000/07/13 17:14:09 clientloop.c typo; todd@fries.net - provos@cvs.openbsd.org 2000/07/13 17:19:31 scp.c close can fail on AFS, report error; from Greg Hudson <ghudson@mit.edu - markus@cvs.openbsd.org 2000/07/14 16:59:46 readconf.c servconf.c allow leading whitespace. ok niels - djm@cvs.openbsd.org 2000/07/14 22:01:38 ssh-keygen.c ssh.c Always create ~/.ssh with mode 700; ok Markus - Fixes for SunOS 4.1.4 from Gordon Atwood <gordon@cs.ualberta.ca - Include floatingpoint.h for entropy.c - strerror replacement --------------- The 2.1.1p3 release of portable OpenSSH has been uploaded to the OpenBSD ftp master site. In a few hours it will be available from one of the many mirrors listed at: http://www.openssh.com/portable.html This release fixes several bugs reported since the previous release and extends portability to NeXT and Reliant Unix. As usual, the OpenBSD team has been hard at work further polishing and enhancing OpenSSH. This release brings a new configuration directive "MaxStartups" which mitigates connection flooding attacks, further details are in the sshd man-page. Another noteworthy difference from previous releases is that 'FallBackToRsh' now defaults to 'no'. Users of this feature may need to edit their /etc/ssh config or ~/.ssh/config files to achieve the same behavior. Again, thanks to those who reported bugs, tested the snapshot and sent fixes. Regards, Damien Miller ------------------ Changelog 20000712 - djm Remove -lresolve for Reliant Unix - djm OpenBSD CVS Updates: - deraadt@cvs.openbsd.org 2000/07/11 02:11:34 session.c sshd.c make MaxStartups code still work with -d; djm - deraadt@cvs.openbsd.org 2000/07/11 13:17:45 readconf.c ssh config disable FallBackToRsh by default - djm Replace in addr t with u int32 t in bsd-inet aton.c. Report from Ben Lindstrom <mouring@pconline.com - djm Make building of X11-Askpass and GNOME-Askpass optional in RPM spec file. - djm Released 2.1.1p3 20000711 - djm Fixup for AIX getuserattr support from Tom Bertelson <tbert@abac.com - djm ReliantUNIX support from Udo Schweigert <ust@cert.siemens.de - djm NeXT: dirent structures to get scp working from Ben Lindstrom <mouring@pconline.com - djm Fix broken inet ntoa check and ut user/ut name confusion, report from Jim Watt <jimw@peisj.pebio.com - djm Replaced bsd-snprintf.c with one from Mutt source tree, it is known to compile on more platforms incl NeXT . - djm Added bsd-inet aton and configure support for NeXT - djm Misc NeXT fixes from Ben Lindstrom <mouring@pconline.com - djm OpenBSD CVS updates: - markus@cvs.openbsd.org 2000/06/26 03:22:29 authfd.c cleanup, less cut&paste - markus@cvs.openbsd.org 2000/06/26 15:59:19 servconf.c servconf.h session.c sshd.8 sshd.c MaxStartups: limit number of unauthenticated connections, work by theo and me - deraadt@cvs.openbsd.org 2000/07/05 14:18:07 session.c use no x11 forwarding flag correctly; provos ok - provos@cvs.openbsd.org 2000/07/05 15:35:57 sshd.c typo - aaron@cvs.openbsd.org 2000/07/05 22:06:58 scp.1 ssh-agent.1 ssh-keygen.1 sshd.8 Insert more missing .El directives. Our troff really should identify these and spit out a warning. - todd@cvs.openbsd.org 2000/07/06 21:55:04 auth-rsa.c auth2.c ssh-keygen.c clean code is good code - deraadt@cvs.openbsd.org 2000/07/07 02:14:29 serverloop.c sense of port forwarding flag test was backwards - provos@cvs.openbsd.org 2000/07/08 17:17:31 compat.c readconf.c replace strtok with strsep; from David Young <dyoung@onthejob.net - deraadt@cvs.openbsd.org 2000/07/08 19:21:15 auth.h KNF - ho@cvs.openbsd.org 2000/07/08 19:27:33 compat.c readconf.c Better conditions for strsep ending. - ho@cvs.openbsd.org 2000/07/10 10:27:05 readconf.c Get the correct message on errors. niels@ ok - ho@cvs.openbsd.org 2000/07/10 10:30:25 cipher.c kex.c servconf.c strtok -- strsep . niels@ ok - djm Fix problem with debug mode and MaxStartups - djm Don't generate host keys when $ DESTDIR is set e.g. during RPM builds - djm Add strsep function from OpenBSD libc for systems that lack it 20000709 - djm Only enable PAM TTY kludge for Linux. Problem report from Kevin Steves <stevesk@sweden.hp.com - djm Match prototype and function declaration for rresvport af. Problem report from Niklas Edmundsson <nikke@ing.umu.se - djm Missing $ DESTDIR on host-key target causing problems with RPM builds. Problem report from Gregory Leblanc <GLeblanc@cu-portland.edu - djm Replace ut name with ut user. Patch from Jim Watt <jimw@peisj.pebio.com - djm Fix pam sprintf fix - djm Cleanup entropy collection code a little more. Split initialisation from seeding, perform initialisation immediately at start, be careful with uids. Based on problem report from Jim Watt <jimw@peisj.pebio.com - djm More NeXT compatibility from Ben Lindstrom <mouring@pconline.com Including sigaction et al. replacements - djm AIX getuserattr session initialisation from Tom Bertelson <tbert@abac.com 20000708 - djm Fix bad fprintf format handling in auth-pam.c. Patch from Aaron Hopkins <aaron@die.net - djm Fix incorrect configure handling of --with-rsh-path option. Fix from Lutz Jaenicke <Lutz.Jaenicke@aet.TU-Cottbus.DE - djm Fixed undefined variables for OSF SIA. Report from Baars, Henk <Hendrik.Baars@nl.origin-it.com - djm Handle EWOULDBLOCK returns from read and write in atomicio.c Fix from Marquess, Steve Mr JMLFDC <Steve.Marquess@DET.AMEDD.ARMY.MIL - djm Don't use inet addr. 20000702 - djm Fix brace mismatch from Corinna Vinschen <vinschen@cygnus.com - djm Stop shadow expiry checking from preventing logins with NIS. Based on fix from HARUYAMA Seigo <haruyama@nt.phys.s.u-tokyo.ac.jp - djm Use standard OpenSSL functions in auth-skey.c. Patch from Chris, the Young One <cky@pobox.com - djm Fix scp progress meter on really wide terminals. Based on patch from James H. Cloos Jr. <cloos@jhcloos.com ------------------ Announcing the release of portable OpenSSH 2.1.1p2. This release primarily contains fixes to the bugs that have been reported over the last month, in particular: - Invalid time bring written to utmp/wtmp on systems using bash2 - Several lastlog fixes - AIX, SCO, Irix portability fixes - Avoid failures on PAM systems when using PAM authentication modules which require a tty. - Entropy collection fixes for Solaris. - EGD robustness improvements - Fixes and enhancements from the OpenBSD team: - Fixed options processing in authorized keys2 file - Compatibility with commercial SSH 2.0.13 and 2.2.0 - Numerous minor fixes There are also a couple of new features: - Shadow password expiry support no password change support yet - Irix 6.x array sessions, project IDs and system audit trail IDs - Beginnings of Tru64 / OSF SIA Security Integration Architecture support - Beginnings of NeXT support Version 2.1.1p2 will be available from the mirrors listed at http://www.openssh.com/portable.html as soon as they update . Many thanks to all those who tested the snapshots and/or contributed bug reports and patches Regards, Damien Miller Announcing the availability of portable OpenSSH 2.1.1p1. This release contains the fix for the "UseLogin yes" vulnerability identified in Markus' release and several other enhancements and bugfixes. Including: - Better login code. Andre Lucas has rewritten the login code to be much more modular and extensible. In the process he has fixed the problems with Solaris utmp x . - Revised the entropy collection code to be faster and more reliable. - Fix for RSA host restrictions "from=" in authorized keys It is recommended that all users upgrade to this version. Portable OpenSSH 2.1.1p1 is available from one of the many mirrors listed at: http://www.openssh.com/portable.html Regards, Damien Miller This is to announce the release of openssh-2.1.0, the first stable release of portable OpenSSH to incorporate support for the SSH2 protocol. The SSH2 protocol offers a number of advantages over the SSH1 protocol including standards compliance SSH2 is on the IETF standards track 1 , improved security and operation without RSA which is patented in some countries . The SSH2 support in OpenSSH has been developed by Markus Friedl, with support from the OpenBSD team. This is also the first version of the portable version of OpenSSH to offer built-in entropy collection. This removes the requirement for EGD on systems that lack a /dev/random driver. As a result, OpenSSH-2.1.0 now requires a recent version of OpenSSL 2 to compile version 0.9.5 or later . NB. The portable version of OpenSSH is currently in the process of merging its webpages with the official OpenBSD project. Please use http://www.openssh.com/ from now on. Distribution files are also available from the mirrors listed at http://violet.ibs.com.au/openssh/files/MIRRORS.html Please read http://www.openssh.com/report.html before reporting bugs. Patches, bug reports, developer and user queries are welcome on the mailing list http://www.openssh.com/list.html . Regards, Damien Miller 1 http://www.ietf.org/html.charters/secsh-charter.html 2 http://www.openssl.org/ The Unix/Linux port of OpenSSH 1.2.3 was released yesterday and should be available from a mirror near you. A mirror list is available from: http://violet.ibs.com.au/openssh/files/MIRRORS.html This release fixes the bugs reported since 1.2.2p1 and contains many cleanups from the OpenBSD tree. In particular, the OpenSSL detection problems have been resolved. The layout has changed a little bit. The packages/ subdirectory has been replaced with a contrib/ subdirectory which contains platform specific code and other patches. Submissions are welcome. Enjoy, Damien Miller 20000317 - Clarified --with-default-path option. - Added -blibpath handling for AIX to work around stupid runtime linking. Problem elucidated by gshapiro@SENDMAIL.ORG by way of Jim Knoble <jmknoble@pobox.com - Checks for 64 bit int types. Problem report from Mats Fredholm <matsf@init.se - OpenBSD CVS updates: - atomicio.c auth-krb4.c bufaux.c channels.c compress.c fingerprint.c packet.h radix.c rsa.c scp.c ssh-agent.c ssh-keygen.c sshconnect.c sshd.c pedantic: signed vs. unsigned, void -arithm, etc - ssh.1 sshd.8 Various cleanups and standardizations. - Runtime error fix for HPUX from Otmar Stahl <O.Stahl@lsw.uni-heidelberg.de 20000316 - Fixed configure not passing LDFLAGS to Solaris. Report from David G. Hesprich <dghespri@sprintparanet.com - Propogate LD through to Makefile - Doc cleanups - Added blurb about "scp: command not found" errors to UPGRADING 20000315 - Fix broken CFLAGS handling during search for OpenSSL. Fixes va list problems with gcc/Solaris. - Don't free argument to putenv after use in setenv replacement . Report from Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp - Created contrib/ subdirectory. Included helpers from Phil Hands' Debian package, README file and chroot patch from Ricardo Cerqueira <rmcc@clix.pt - Moved gnome-ssh-askpass.c to contrib directory and removed config option. - Slight cleanup to doc files - Configure fix from Bratislav ILICH <bilic@zepter.ru 20000314 - Include macro for IN6 IS ADDR V4MAPPED. Report from peter@frontierflying.com - Include /usr/local/include and /usr/local/lib for systems that don't do it themselves - -R/usr/local/lib for Solaris - Fix RSAref detection - Fix IN6 IS ADDR V4MAPPED macro 20000311 - Detect RSAref - OpenBSD CVS change sshd.c - disallow guessing of root password - More configure fixes - IPv6 workarounds from Hideaki YOSHIFUJI <yoshfuji@ecei.tohoku.ac.jp 20000309 - OpenBSD CVS updates to v1.2.3 ssh.h atomicio.c - int atomicio - ssize t for alpha . ok deraadt@ auth-rsa.c - delay MD5 computation until client sends response, free early, cleanup. cipher.c - void - unsigned char , ok niels@ hostfile.c - remove unused variable 'len'. fix comments. - remove unused variable log-client.c log-server.c - rename a cpp symbol, to avoid param.h collision packet.c - missing xfree - getsockname requires initialized tolen; andy@guildsoftware.com - use getpeername in packet connection is on socket , fixes sshd -i; from Holger.Trapp@Informatik.TU-Chemnitz.DE pty.c pty.h - register cleanup for pty earlier. move code for pty-owner handling to pty.c ok provos@, dugsong@ readconf.c - turn off x11-fwd for the client, too. rsa.c - PKCS 1 padding scp.c - allow '.' in usernames; from jedgar@fxp.org servconf.c - typo: ignore user known hosts int- flag; naddy@mips.rhein-neckar.de - sync with sshd config ssh-keygen.c - enable ssh-keygen -l -f ~/.ssh/known hosts, ok deraadt@ ssh.1 - Change invalid 'CHAT' loglevel to 'VERBOSE' ssh.c - suppress AAAA query host when '-4' is used; from shin@nd.net.fujitsu.co.jp - turn off x11-fwd for the client, too. sshconnect.c - missing xfree - retry rresvport af , too. from sumikawa@ebina.hitachi.co.jp. - read error vs. "Connection closed by remote host" sshd.8 - ie. - i.e., - do not link to a commercial page.. - sync with sshd config sshd.c - no need for poll.h; from bright@wintelcom.net - log with level log not fatal if peer behaves badly. - don't panic if client behaves strange. ok deraadt@ - make no-port-forwarding for RSA keys deny both -L and -R style fwding - delay close of pty until the pty has been chowned back to root - oops, fix comment, too. - missing xfree - move XAUTHORITY to subdir. ok dugsong@. fixes debian bug 57907, too. http://cgi.debian.org/cgi-bin/bugreport.cgi?archive=no&bug=57907 - register cleanup for pty earlier. move code for pty-owner handling to pty.c ok provos@, dugsong@ - create x11 cookie file - fix pr 1113, fclose - pclose , todo: remote popen - version 1.2.3 - Cleaned up - Removed warning workaround for Linux and devpts filesystems no longer required after OpenBSD updates 20000308 - Configure fix from Hiroshi Takekawa <takekawa@sr3.t.u-tokyo.ac.jp It gives me no little pleasure to announce the first stable release of the Unix port of OpenSSH. It is available in tar.gz and RPM format from one of the mirrors listed at: http://violet.ibs.com.au/openssh/files/MIRRORS.html This release fixes all known issues and is known to compile and function on at least recent releases on Linux, Solaris, HPUX and SCO Unixware. Please review the ChangeLog 1 for details on what has changed since the last release. I am holding off on a wider announcement until the mirrors have updated. Thanks to everyone who assisted with testing, bug reports, success stories and most of all, patches : Special thanks to the OpenBSD developers for giving us OpenSSH to begin with. Regards, Damien Miller 1 http://violet.ibs.com.au/openssh/files/ChangeLog $OpenBSD: releasenotes.html,v 1.89 2026/08/11 03:51:14 djm Exp $