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Gentoo: GLSA-202309-05 Medium: Yubico pam-u2f Remote Access Vulnerability

gentoo
Calendar Grey August 10, 2022
Dist Gentoo Esm H88
Investigate a minor vulnerability in pam-u2f on Gentoo Linux, which permits local users to bypass the PIN requirement, thereby jeopardizing the security of the authentication process.
A vulnerability has been discovered in pam-u2f which could allow a local attacker to bypass PIN entry.

Summary

A logic issue in Yubico pam-u2f could result in the bypass of a PIN entry requirement when authenticating with FIDO2.

Topics%20covered

Topics Covered

security advisory low severity pam module local bypass yubico

Resolution

All Yubico pam-u2f users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-auth/pam_u2f-1.1.1"

References

[ 1 ] CVE-2021-31924 https://nvd.nist.gov/vuln/detail/CVE-2021-31924 [ 2 ] YSA-2021-03

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202208-11
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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.

Severity
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Severity: Low
Title: Yubico pam-u2f: Local PIN Bypass vulnerability
Date: August 10, 2022
Bugs: #792270
ID: 202208-11

Topics%20covered

Topics Covered

security advisory low severity pam module local bypass yubico

Synopsis

A vulnerability has been discovered in pam-u2f which could allow a local attacker to bypass PIN entry.

Background

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

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-auth/pam_u2f < 1.1.1 >= 1.1.1

Impact

===== An attacker with local access to certain applications using pam-u2f for authentication could incorrectly successfully authenticate without entering the authentication PIN.

Workaround

There is no known workaround at this time.