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Debian Security Advisory DSA-5591-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
December 28, 2023 https://www.debian.org/security/faq
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Package : libssh
CVE ID : CVE-2023-6004 CVE-2023-6918 CVE-2023-48795
Debian Bug : 1059004 1059059 1059061
Several vulnerabilities were discovered in libssh, a tiny C SSH library.
CVE-2023-6004
It was reported that using the ProxyCommand or the ProxyJump feature
may allow an attacker to inject malicious code through specially
crafted hostnames.
CVE-2023-6918
Jack Weinstein reported that missing checks for return values for
digests may result in denial of service (application crashes) or
usage of uninitialized memory.
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/
For the oldstable distribution (bullseye), these problems have been fixed
in version 0.9.8-0+deb11u1.
For the stable distribution (bookworm), these problems have been fixed in
version 0.10.6-0+deb12u1.
We recommend that you upgrade your libssh packages.
For the detailed security status of libssh please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/libssh
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: debian-security-announce@lists.debian.org
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