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

Quick assessment

Affected
OpenSC pam_pkcs11
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PAM-PKCS#11是OpenSC开源的一个登录模块。 PAM-PKCS#11 0.6.12及之前版本存在代码问题漏洞，该漏洞源于未正确处理用户取消输入PIN操作，导致段错误，可能导致使用PAM的守护进程崩溃。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-24031

Vulnerability Information
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Vulnerability Title
PAM-PKCS#11 vulnerable to segmentation fault on ctrl-c/ctrl-d when asked for PIN
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
PAM-PKCS#11 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PAM-PKCS#11是OpenSC开源的一个登录模块。 PAM-PKCS#11 0.6.12及之前版本存在代码问题漏洞，该漏洞源于未正确处理用户取消输入PIN操作，导致段错误，可能导致使用PAM的守护进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSC pam_pkcs11 <= 0.6.12 -

II. Public POCs for CVE-2025-24031

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III. Intelligence Information for CVE-2025-24031

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Patches & Fixes for CVE-2025-24031 (2)

Vendor Advisories for CVE-2025-24031 (1)

IV. Related Vulnerabilities

Same product: pam_pkcs11
Same vendor: OpenSC
Same weakness: CWE-476

V. Comments for CVE-2025-24031

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