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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 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)
mantic

Released (1:9.3p1-1ubuntu2)
noble

Released (1:9.3p1-1ubuntu2)
trusty

Released (1:6.6p1-2ubuntu2.13+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) upstream

Released (9.3p2)
xenial

Released (1:7.2p2-4ubuntu2.10+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) 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 bionic Needs triage


focal Needs triage


jammy Needs triage


kinetic Ignored

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

(end of life, was needs-triage)
mantic Needs triage


noble Needs triage


trusty Does not exist


upstream Ignored

(frozen on openssh 7.5p)
xenial Does not exist




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


REFERENCES

 * https://www.openssh.com/security.html
 * https://www.openssh.com/txt/release-9.3p2
 * https://ubuntu.com/security/notices/USN-6242-1
 * https://ubuntu.com/security/notices/USN-6242-2
 * https://www.cve.org/CVERecord?id=CVE-2023-38408
 * NVD
 * Launchpad
 * Debian


JOIN THE DISCUSSION

 * Ubuntu security updates mailing list
 * Security announcements mailing list


CANONICAL IS OFFERING EXPANDED SECURITY MAINTENANCE

Canonical is offering Ubuntu Expanded Security Maintenance (ESM) for security
fixes and essential packages.

Find out more about ESM ›


FURTHER READING

 * An overview of machine learning security risks
 * What’s new in security for Ubuntu 24.04 LTS?
 * Canonical at America Digital Congress in Chile
 * Canonical’s showcase at HPE Tech Jam 2024
 * Ubuntu Explained: How to ensure security and stability in cloud
   instances—part 3

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