{"id":"CVE-2011-4120","aliases":["DEBIAN-CVE-2011-4120","EUVD-2011-4068","GHSA-4qc6-w2f8-x2pc"],"status":"published","title":"Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM...","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.02019,"percentile":0.81059,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2019-11-26T04:17:52Z","modified":"2026-10-23T18:02:49Z","fixes":[{"ecosystem":"Debian:12","package":"yubico-pam","fixed_in":["2.10-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"yubico-pam","fixed_in":["2.10-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"yubico-pam","fixed_in":["2.10-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"yubico-pam","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"yubico-pam","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"yubico-pam","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.10-1"}]}]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"yubico","product":"pam_module"},{"vendor":"yubico-pam","product":"yubico-pam"}],"references":[{"url":"https://security-tracker.debian.org/tracker/CVE-2011-4120","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Third Party Advisory","advisory","fix","report"]},{"url":"https://access.redhat.com/security/cve/cve-2011-4120","tags":["x_refsource_MISC","x_transferred","Broken Link","Third Party Advisory","advisory","web"]},{"url":"https://www.openwall.com/lists/oss-security/2011/11/07/6","tags":["x_refsource_MISC","x_transferred","Mailing List","Third Party Advisory","advisory","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-4120"},{"url":"https://github.com/advisories/GHSA-4qc6-w2f8-x2pc"}],"sources":{"cve":[{"id":"CVE-2011-4120","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.","status":"published","published":"2019-11-26T04:17:52Z","modified":"2024-08-07T00:01:50.367Z","updated_at":"2026-11-02T14:35:37.989579Z"}],"euvd":[{"id":"EUVD-2011-4068","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.","status":"published","published":"2019-11-26T04:17:52Z","modified":"2024-08-07T00:01:50Z","updated_at":"2026-11-03T01:39:49.441333Z"}],"ghsa":[{"id":"GHSA-4qc6-w2f8-x2pc","title":"Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM...","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.","status":"published","published":"2022-04-22T00:24:18Z","modified":"2024-04-03T23:05:48Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:55:47.283285Z"}],"nvd":[{"id":"CVE-2011-4120","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.","status":"published","published":"2019-11-26T05:15:13.13Z","modified":"2026-06-16T23:34:27.81Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:02:12.945371Z"}],"osv":[{"id":"CVE-2011-4120","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.","status":"published","published":"2019-11-26T05:15:13Z","modified":"2026-04-10T03:42:02.476917Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:43:58.279353Z"},{"id":"DEBIAN-CVE-2011-4120","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.","status":"published","published":"2019-11-26T05:15:13.13Z","modified":"2026-10-23T18:02:49.059802038Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:24.612044Z"}]}}