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Vulnerability · Published Feb 10, 2025 · Assigned by GitHub_M

CVE-2025-24031PAM-PKCS#11 vulnerable to segmentation fault on ctrl-c/ctrl-d when asked for PIN

Medium 5.1

In plain English

A medium-severity null pointer dereference in pam_pkcs11 from OpenSC. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.1%top 96.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pam-pkcs11no fix listedDEBIAN-CVE-2025-24031
Debian:13pam-pkcs11no fix listedDEBIAN-CVE-2025-24031
Debian:14pam-pkcs11no fix listedDEBIAN-CVE-2025-24031
Ubuntu:22.04:LTSpam-pkcs11no fix listedUBUNTU-CVE-2025-24031
Ubuntu:24.04:LTSpam-pkcs11no fix listedUBUNTU-CVE-2025-24031
Ubuntu:25.10pam-pkcs11no fix listedUBUNTU-CVE-2025-24031
Ubuntu:26.04:LTSpam-pkcs11no fix listedUBUNTU-CVE-2025-24031
Ubuntu:26.10pam-pkcs11no fix listedUBUNTU-CVE-2025-24031

Affected products (as reported)

VendorProductVersions
OpenSC pam_pkcs11 <= 0.6.12

Weakness: CWE-476 · Vector: 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

References