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Ed Maste
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Full release notes are available at https://www.openssh.com/txt/release-10.4 Selected highlights from the release notes: 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. * 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): 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". Bugfixes -------- * 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 Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D58083
Other patches and addons for OpenSSH. Please send submissions to [email protected] Externally maintained --------------------- SSH Proxy Command -- connect.c Shun-ichi GOTO <[email protected]> has written a very useful ProxyCommand which allows the use of outbound SSH from behind a SOCKS4, SOCKS5 or https CONNECT style proxy server. His page for connect.c has extensive documentation on its use as well as compiled versions for Win32. https://bitbucket.org/gotoh/connect/wiki/Home X11 SSH Askpass: Jim Knoble <[email protected]> has written an excellent X11 passphrase requester. This is highly recommended: http://www.jmknoble.net/software/x11-ssh-askpass/ In this directory ----------------- ssh-copy-id: Phil Hands' <[email protected]> shell script to automate the process of adding your public key to a remote machine's ~/.ssh/authorized_keys file. gnome-ssh-askpass[1234]: Graphical passhrase requesters. Use "make gnome-ssh-askpass1" to build a variant for ancient GNOME desktop, "make gnome-ssh-askpass2" for a GTK 2-based one, "make gnome-ssh-askpass3" for a GTK 3-based one, or "make gnome-ssh-askpass4" for a version for modern GNOME. sshd.pam.generic: A generic PAM config file which may be useful on your system. YMMV sshd.pam.freebsd: A PAM config file which works with FreeBSD's PAM port. Contributed by Dominik Brettnacher <[email protected]> findssl.sh: Search for all instances of OpenSSL headers and libraries and print their versions. This is intended to help diagnose OpenSSH's "OpenSSL headers do not match your library" errors. aix: Files to build an AIX native (installp or SMIT installable) package. caldera: RPM spec file and scripts for building Caldera OpenLinuix packages cygwin: Support files for Cygwin hpux: Support files for HP-UX redhat: RPM spec file and scripts for building Redhat packages suse: RPM spec file and scripts for building SuSE packages