CVE-2025-24031
PAM-PKCS#11 vulnerable to segmentation fault on ctrl-c/ctrl-d when asked for PIN
- State
- Published
- Severity
- 5.1 Medium
- Published
- Feb 10, 2025
- Updated
- Feb 10, 2025
- Reserved
- Jan 16, 2025
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L | GitHub_M |
Weaknesses
- CWE-476 NULL Pointer Dereference
Affected Products
| Product | Versions |
|---|---|
pam_pkcs11OpenSC |
|
References
- https://github.com/OpenSC/pam_pkcs11/security/advisories/GHSA-wvr3-c9x3-9mff
- https://github.com/OpenSC/pam_pkcs11/blob/bb2e3f3a95e44fdf44b0d5a4b377db3179021380/src/pam_pkcs11/pam_pkcs11.c#L211
- https://github.com/OpenSC/pam_pkcs11/blob/bb2e3f3a95e44fdf44b0d5a4b377db3179021380/src/pam_pkcs11/pam_pkcs11.c#L797
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