{
  "modified": "2025-08-09T19:01:26Z",
  "published": "2019-11-26T05:15:13Z",
  "id": "CVE-2011-4120",
  "details": "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": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/cve-2011-4120"
    },
    {
      "type": "ADVISORY",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120"
    },
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2011-4120"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.openwall.com/lists/oss-security/2011/11/07/6"
    },
    {
      "type": "ARTICLE",
      "url": "https://www.openwall.com/lists/oss-security/2011/11/07/6"
    },
    {
      "type": "FIX",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/cve-2011-4120"
    }
  ]
}