#VU102855 Improper Authentication in pam-u2f - CVE-2025-23013

Vulnerability identifier: #VU102855

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-23013

CWE-ID: CWE-287

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
pam-u2f
Web applications / Other software

Vendor: Yubico

Description

The vulnerability allows a local user to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests. A local user can bypass authentication process and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

pam-u2f: 0.0.0 - 1.3.0

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External links
https://www.yubico.com/support/security-advisories/ysa-2025-01

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.