Ubuntu 7363-1: PAM-PKCS#11 Security Advisory Updates

ubuntu

March 20, 2025

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

Summary

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

Software Description:

- 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)

Topics Covered

security advisory update instructions ubuntu authentication bypass severity pam-pkcs11

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 LTS
   libpam-pkcs11                   0.6.12-2ubuntu0.24.04.1

Ubuntu 22.04 LTS
   libpam-pkcs11                   0.6.11-4ubuntu0.1

Ubuntu 20.04 LTS
   libpam-pkcs11                   0.6.11-2ubuntu0.1

Ubuntu 18.04 LTS
   libpam-pkcs11                   0.6.9-2ubuntu0.1~esm1
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   libpam-pkcs11                   0.6.8-4ubuntu0.1~esm1
                                   Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.