USN-7363-1: PAM-PKCS#11 vulnerabilities

USN-7363-1: PAM-PKCS#11 vulnerabilities
20 March 2025

PAM-PKCS#11 could be used to bypass authentication.

Releases
Ubuntu 24.10 Ubuntu 24.04 LTS Ubuntu 22.04 LTS Ubuntu 20.04 LTS Ubuntu 18.04 ESM Ubuntu 16.04 ESM

Packages
pam-pkcs11 - Fully featured PAM module for using PKCS#11 smart cards

Details
Marcus Rückert and Matthias Gerstner discovered that PAM-PKCS#11 did not
properly handle certain return codes when authentication was not possible.
An attacker could possibly use this issue to bypass authentication. This
issue only affected Ubuntu 24.04 LTS and Ubuntu 24.10. (CVE-2025-24531)

It was discovered that PAM-PKCS#11 did not require a private key signature
for authentication by default. An attacker could possibly use this issue
to bypass authentication. (CVE-2025-24032)

Update instructions
The problem can be corrected by updating your system to the following package versions:

Ubuntu 24.10

• libpam-pkcs11 - 0.6.12-2ubuntu0.24.10.1
  Ubuntu 24.04
• libpam-pkcs11 - 0.6.12-2ubuntu0.24.04.1
  Ubuntu 22.04
• libpam-pkcs11 - 0.6.11-4ubuntu0.1
  Ubuntu 20.04
• libpam-pkcs11 - 0.6.11-2ubuntu0.1
  Ubuntu 18.04
• libpam-pkcs11 - 0.6.9-2ubuntu0.1~esm1
  Ubuntu 16.04
• libpam-pkcs11 - 0.6.8-4ubuntu0.1~esm1
  In general, a standard system update will make all the necessary changes.