-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
- -------------------------------------------------------------------------
Debian Security Advisory DSA-5586-1                   [email protected]
https://www.debian.org/security/                     Salvatore Bonaccorso
December 22, 2023                     https://www.debian.org/security/faq
- -------------------------------------------------------------------------
Package        : openssh
CVE ID         : CVE-2021-41617 CVE-2023-28531 CVE-2023-48795 CVE-2023-51384
                 CVE-2023-51385
Debian Bug     : 995130 1033166
Several vulnerabilities have been discovered in OpenSSH, an
implementation of the SSH protocol suite.
CVE-2021-41617
    It was discovered that sshd 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 was started with.
CVE-2023-28531
    Luci Stanescu reported that a error prevented constraints being
    communicated to the ssh-agent when adding smartcard keys to the
    agent with per-hop destination constraints, resulting in keys being
    added without constraints.
CVE-2023-48795
    Fabian Baeumer, Marcus Brinkmann and Joerg Schwenk discovered that
    the SSH protocol is prone to a prefix truncation attack, known as
    the "Terrapin attack". This attack allows a MITM attacker 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.
    Details can be found at https://terrapin-attack.com/
CVE-2023-51384
    It was discovered that when PKCS#11-hosted private keys were
    added while specifying destination constraints, if the PKCS#11
    token returned multiple keys then only the first key had the
    constraints applied.
CVE-2023-51385
    It was discovered that if an invalid user or hostname that contained
    shell metacharacters was passed to ssh, and a ProxyCommand,
    LocalCommand directive or "match exec" predicate referenced the user
    or hostname via expansion tokens, then an attacker who could supply
    arbitrary user/hostnames to ssh could potentially perform command
    injection. The situation could arise in case of git repositories
    with submodules, where the repository could contain a submodule with
    shell characters in its user or hostname.
For the oldstable distribution (bullseye), these problems have been fixed
in version 1:8.4p1-5+deb11u3.
For the stable distribution (bookworm), these problems have been fixed in
version 1:9.2p1-2+deb12u2.
We recommend that you upgrade your openssh packages.
For the detailed security status of openssh please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/openssh
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: [email protected]
-----BEGIN PGP SIGNATURE-----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2W//
-----END PGP SIGNATURE-----