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PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the pam_pkcs11 module segfaults when a user presses ctrl-c/ctrl-d when they are asked for a PIN. When a user enters no PIN at all, `pam_get_pwd` will never initialize the password buffer pointer and as such `cleanse` will try to dereference an uninitialized pointer. On my system this pointer happens to have the value 3 most of the time when running sudo and as such it will segfault. The most likely impact to a system affected by this issue is an availability impact due to a daemon that uses PAM crashing. As of time of publication, a patch for the issue is unavailable.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | No solution exists | May 15, 2025 | Feb 10, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 10, 2025 |
| Suse | — | Upgrade pam_pkcs11-32bitUpgrade pam_pkcs11Upgrade pam_pkcs11-devel-doc | Mar 3, 2025 | Feb 10, 2025 |
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