UBUNTU-CVE-2025-24031 (CVE-2025-24031)
Vulnerability from osv_ubuntu – Published: 2025-02-10 16:15 – Updated: 2026-05-20 15:17 – Source website
VLAI
Details
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.
Severity
N/A (UNKNOWN)
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.8-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.8-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.8-4",
"0.6.8-4ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.9-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.9-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.9-1",
"0.6.9-2",
"0.6.9-2build1",
"0.6.9-2build2",
"0.6.9-2ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.11-2ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.11-2ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.11-2",
"0.6.11-2ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.11-4ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.11-4ubuntu0.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.11-4build1",
"0.6.11-4build2",
"0.6.11-4ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.12-2ubuntu0.24.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.12-2ubuntu0.24.04.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.12-1",
"0.6.12-2",
"0.6.12-2build2",
"0.6.12-2build3",
"0.6.12-2ubuntu0.24.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.13-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.13-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.13-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-pkcs11",
"binary_version": "0.6.13-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "pam-pkcs11",
"purl": "pkg:deb/ubuntu/pam-pkcs11@0.6.13-1build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.13-1",
"0.6.13-1build1"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2025-24031",
"modified": "2026-05-20T15:17:30Z",
"published": "2025-02-10T16:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-24031"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-24031"
},
{
"type": "REPORT",
"url": "https://github.com/OpenSC/pam_pkcs11/security/advisories/GHSA-wvr3-c9x3-9mff"
},
{
"type": "REPORT",
"url": "https://github.com/OpenSC/pam_pkcs11/blob/bb2e3f3a95e44fdf44b0d5a4b377db3179021380/src/pam_pkcs11/pam_pkcs11.c#L211"
},
{
"type": "REPORT",
"url": "https://github.com/OpenSC/pam_pkcs11/blob/bb2e3f3a95e44fdf44b0d5a4b377db3179021380/src/pam_pkcs11/pam_pkcs11.c#L797"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2025-24031"
]
}
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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