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CVE-2023-38408

Published: 19 July 2023

The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remote code execution if an agent is forwarded to an attacker-controlled system. (Code in /usr/lib is not necessarily safe for loading into ssh-agent.) NOTE: this issue exists because of an incomplete fix for CVE-2016-10009.

Notes

AuthorNote
seth-arnold
openssh-ssh1 is provided for compatibility with old devices
that
cannot be upgraded to modern protocols. Thus we may not
provide security
support for this package if doing so would prevent access to
equipment.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
trusty
Released (1:6.6p1-2ubuntu2.13+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (1:7.2p2-4ubuntu2.10+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (1:7.6p1-4ubuntu0.7+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (1:8.2p1-4ubuntu0.8)
jammy
Released (1:8.9p1-3ubuntu0.3)
kinetic Ignored
(end of life)
lunar
Released (1:9.0p1-1ubuntu8.4)
upstream
Released (9.3p2)
Patches:
upstream: https://github.com/openssh/openssh-portable/commit/892506b13654301f69f9545f48213fc210e5c5cc
upstream: https://github.com/openssh/openssh-portable/commit/1f2731f5d7a8f8a8385c6031667ed29072c0d92a
upstream: https://github.com/openssh/openssh-portable/commit/29ef8a04866ca14688d5b7fed7b8b9deab851f77
upstream: https://github.com/openssh/openssh-portable/commit/099cdf59ce1e72f55d421c8445bf6321b3004755
openssh-ssh1
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Needs triage

focal Needs triage

jammy Needs triage

kinetic Ignored
(end of life, was needs-triage)
lunar Needs triage

upstream Ignored
(frozen on openssh 7.5p)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H