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[USN-7806-1] PAM/U2F vulnerability

Posted on 06 October 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7806-1
October 06, 2025

pam-u2f vulnerability
==========================================================================
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.

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

Package Information:
https://launchpad.net/ubuntu/+source/pam-u2f/1.1.0-1.1+deb12u1build0.24.04.1
https://launchpad.net/ubuntu/+source/pam-u2f/1.1.0-1.1+deb12u1build0.22.04.1

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