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Format: 1.8
Date: Fri, 11 Apr 2025 16:00:55 +0100
Source: openssh
Architecture: source
Version: 1:10.0p1-1
Distribution: unstable
Urgency: medium
Maintainer: Debian OpenSSH Maintainers <debian-ssh@lists.debian.org> Changed-By: Colin Watson <cjwatson@debian.org>
Closes: 1102603
Changes:
openssh (1:10.0p1-1) unstable; urgency=medium
.
[ Luca Boccassi ]
* Add COLORTERM NO_COLOR to SendEnv and AcceptEnv.
.
[ Colin Watson ]
* New upstream release:
- This release removes support for the weak DSA signature algorithm.
- scp(1), sftp(1): pass "ControlMaster no" to ssh when invoked by scp &
sftp.
- 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".
- 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.
- 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.
- CVE-2025-32728: sshd(8): fix the DisableForwarding directive, which
was failing to disable X11 forwarding and agent forwarding as
documented (closes: #1102603). X11 forwarding is disabled by default
in the server and agent forwarding is off by default in the client.
- 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.
- 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.
- sshd(1): support the VersionAddendum in the client, mirroring the
option of the same name in the server.
- 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.
- ssh-keygen(1): support FIDO tokens that return no attestation data,
e.g. recent WinHello.
- ssh-agent(1): add a "-Owebsafe-allow=..." option to allow the default
FIDO application ID allow-list to be overridden.
- ssh-keygen(1): allow "-" as output file for moduli screening.
- 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.
- 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.
- sftp(1), ssh(1): fix a number of possible NULL dereference bugs,
including Coverity CIDs 405019 and 477813.
- sshd(8): fix PerSourcePenalty incorrectly using "crash" penalty when
LoginGraceTime was exceeded.
- 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.
- 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^ ...".
- 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.
- ssh-keygen(1): don't mess up ssh-keygen -l output when the file
contains CR characters.
- 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.
- 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.
* Configure --with-linux-memlock-onfault on Linux.
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