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[gentoo-announce] [ GLSA 202501-04 ] Yubico pam-u2f: Partial Authentication Bypass

Posted on 23 January 2025
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 202501-04
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https://security.gentoo.org/
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Severity: High
Title: Yubico pam-u2f: Partial Authentication Bypass
Date: January 23, 2025
Bugs: #948201
ID: 202501-04

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Synopsis
========
A vulnerability has been discovered in Yubico pam-u2f, which can lead to
a partial authentication bypass.

Background
==========
Yubico pam-u2f is a PAM module for FIDO2 and U2F keys.

Affected packages
=================
Package Vulnerable Unaffected
---------------- ------------ ------------
sys-auth/pam_u2f < 1.3.2 >= 1.3.2

Description
===========
Multiple vulnerabilities have been discovered in Yubico pam-u2f. Please
review the CVE identifiers referenced below for details.

Impact
======
Depending on specific settings and usage scenarios the result of the
pam-u2f module may be altered or ignored.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All Yubico pam-u2f users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-auth/pam_u2f-1.3.2"

References
==========
[ 1 ] CVE-2025-23013
https://nvd.nist.gov/vuln/detail/CVE-2025-23013
[ 2 ] YSA-2025-01
https://www.yubico.com/support/security-advisories/YSA-2025-01

Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/202501-04

Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======
Copyright 2025 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5
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