CVE-2016-4422

Publication date 6 May 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libpam-sshauth	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Fixed 0.3.1-1ubuntu2
	15.10 wily	Fixed 0.3.1-1ubuntu0.15.10.1
	14.04 LTS trusty	Fixed 0.3.1-1deb8u1build0.14.04.1
	12.04 LTS precise	Ignored end of life

Notes

sbeattie

simplified fix in oss-security posting

Patch details

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

Package	Patch details
libpam-sshauth	Upstream: https://bazaar.launchpad.net/~ltsp-upstream/ltsp/libpam-sshauth/revision/114

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