CVE-2011-4120

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.

• CWE-20

• 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

Published

Nov 26, 2019

Last Modified

Jun 16, 2026

Status

Modified

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