CVE-2023-38408

Publication date 19 July 2023

Last updated 11 February 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openssh	24.10 oracular	Fixed 1:9.3p1-1ubuntu2
	24.04 LTS noble	Fixed 1:9.3p1-1ubuntu2
	23.10 mantic	Fixed 1:9.3p1-1ubuntu2
	23.04 lunar	Fixed 1:9.0p1-1ubuntu8.4
	22.10 kinetic	Ignored end of life
	22.04 LTS jammy	Fixed 1:8.9p1-3ubuntu0.3
	20.04 LTS focal	Fixed 1:8.2p1-4ubuntu0.8
	18.04 LTS bionic	Fixed 1:7.6p1-4ubuntu0.7+esm1 Ubuntu Pro
	16.04 LTS xenial	Fixed 1:7.2p2-4ubuntu2.10+esm3 Ubuntu Pro
	14.04 LTS trusty	Fixed 1:6.6p1-2ubuntu2.13+esm1 Ubuntu Pro
openssh-ssh1	24.10 oracular	Ignored
	24.04 LTS noble	Ignored
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Ignored
	20.04 LTS focal	Ignored
	18.04 LTS bionic	Ignored
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

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Notes

mdeslaur

openssh-ssh1 is only provided for compatibility with old devices that cannot be upgraded to modern protocols. We will not be providing any security support for the openssh-ssh1 package as it is insecure and should be used in trusted environments only.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openssh	Upstream: 892506b Upstream: 1f2731f Upstream: 29ef8a0 Upstream: 099cdf5

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
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