In Yubico pam-u2f before 1.3.1, local privilege escalation can sometimes occur. This product implements a Pluggable Authentication Module (PAM) that can be deployed to support authentication using a YubiKey or other FIDO compliant authenticators on macOS or Linux. This software package has an issue that allows for an authentication bypass in some configurations. An attacker would require the ability to access the system as an unprivileged user. Depending on the configuration, the attacker may also need to know the user's password.
CVSS Details
- CVSS 4.0 Base Score: 7.3 (HIGH)
- CVSS 4.0 Vector: (CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade pam-u2f | Aug 8, 2025 | Jan 15, 2025 |
| Debian | — | Upgrade pam-u2f | Jan 31, 2025 | Jan 15, 2025 |
| Gentoo Linux | — | Upgrade sys-auth/pam_u2f. | Jan 24, 2025 | Jan 15, 2025 |
| Suse | — | Upgrade pam_u2f | Jan 20, 2025 | Jan 15, 2025 |
| Ubuntu | — | Upgrade libpam-u2f (Ubuntu Pro)Upgrade pamu2fcfg (Ubuntu Pro)Upgrade libpam-u2fUpgrade pamu2fcfg | Oct 7, 2025 | Jan 15, 2025 |
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