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CVE-2023-6004

Published: 3 January 2024

A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter.

Notes

AuthorNote
mdeslaur
original patches introduce a regression, see upstream bug

Priority

Medium

Cvss 3 Severity Score

4.8

Score breakdown

Status

Package Release Status
libssh
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
xenial
Released (0.6.3-4.3ubuntu0.6+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (0.9.3-2ubuntu2.5)
jammy
Released (0.9.6-2ubuntu0.22.04.3)
lunar
Released (0.10.4-2ubuntu0.3)
mantic
Released (0.10.5-3ubuntu1.2)
upstream
Released (0.10.6-1)
Patches:
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/c2c56bacab00766d01671413321d564227aabf19 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/a66b4a6eae6614d200a3625862d77565b96a7cd3 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/8615c24647f773a5e04203c7459512715d698be1 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/c6180409677c765e6b9ae2b18a3a7a9671ac1dbe (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/9bbb817c0c5434f03613d0783b2ef5f52235b901 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/22492b69bba22b102342afc574800d354a08e405 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/d7467498fd988949edde9c6384973250fd454a8b (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/62d3101c1f76b6891b70c50154e0e934d6b8cb57 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/cea841d71c025f9c998b7d5fc9f2a2839df62921 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/2c492ee179d5caa2718c5e768bab6e0b2b64a8b0 (libssh-0.10.6)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/1a02364b5107a4125ea3cb76fcdb6beabaebf3be (0.10.x regression fix)
upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/6f1b1e76bb38bc89819132e1810e4301ec9034a4 (0.10.x regression fix)

Severity score breakdown

Parameter Value
Base score 4.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction Required
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L