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Ubuntu 24.04: Denial of Service Due to PAM/U2F Auth Bypass USN-7806-1

ubuntu
Calendar Grey October 6, 2025
Dist Ubuntu Esm H88
PAM/U2F on Ubuntu can crash or run admin programs due to crafted files; important update available.
PAM/U2F could be made to crash or run programs as an administrator if it opened a specially crafted file.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: PAM/U2F could be made to crash or run programs as an administrator if it opened a specially crafted file. Software Description: - pam-u2f: A module that implements PAM over U2F and FIDO2 Details: It was discovered that PAM/U2F could allow for authentication bypass in some configurations. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service.

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu authentication bypass pam-u2f

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS libpam-u2f 1.1.0-1.1+deb12u1build0.24.04.1 pamu2fcfg 1.1.0-1.1+deb12u1build0.24.04.1 Ubuntu 22.04 LTS libpam-u2f 1.1.0-1.1+deb12u1build0.22.04.1 pamu2fcfg 1.1.0-1.1+deb12u1build0.22.04.1 Ubuntu 20.04 LTS libpam-u2f 1.0.8-1ubuntu0.1~esm1 Available with Ubuntu Pro pamu2fcfg 1.0.8-1ubuntu0.1~esm1 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7806-1

CVE-2025-23013

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7806-1

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu authentication bypass pam-u2f

Package Information

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