CVE-2011-4120

CriticalCVSS 9.8/10Last modified Jun 16, 2026

Description

Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
yubico-pam	yubico-pam	before 2.10

References

https://access.redhat.com/security/cve/cve-2011-4120Broken Link, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120Issue Tracking, Patch, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2011-4120Third Party Advisory
https://www.openwall.com/lists/oss-security/2011/11/07/6Mailing List, Third Party Advisory
https://access.redhat.com/security/cve/cve-2011-4120Broken Link, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120Issue Tracking, Patch, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2011-4120Third Party Advisory
https://www.openwall.com/lists/oss-security/2011/11/07/6Mailing List, Third Party Advisory

Timeline

Published: Nov 26, 2019
Last modified: Jun 16, 2026
NVD status: Modified

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