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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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