CVE-2025-24032 Information

Description

PAM-PKCS11 is a Linux-PAM login module that allows a X.509 certificate based user login. Prior to version 0.6.13 if cert_policy is set to none (the default value) then pam_pkcs11 will only check if the user is capable of logging into the token. An attacker may create a different token with the user’s public data (e.g. the user’s certificate) and a PIN known to the attacker. If no signature with the private key is required then the attacker may now login as user with that created token. The default to not check the private key’s signature has been changed with commit commi6638576892b59a99389043c90a1e7dd4d783b921 so that all versions starting with pam_pkcs11-0.6.0 should be affected. As a workaround in pam_pkcs11.conf set at least cert_policy = signature;.

Reference

https://github.com/OpenSC/pam_pkcs11/commit/470263258d1ac59c5eade439c4d9caba0097e6e6 https://github.com/OpenSC/pam_pkcs11/commit/b665b287ff955bbbd9539252ff9f9e2754c3fb48 https://github.com/OpenSC/pam_pkcs11/commit/d9530167966a77115db6e885d459382a2e52ee9e https://github.com/OpenSC/pam_pkcs11/releases/tag/pam_pkcs11-0.6.13 https://github.com/OpenSC/pam_pkcs11/security/advisories/GHSA-8r8p-7mgp-vf56