{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.8.29"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "6b83a6eee0bbbe654eb54d5a1fcf149ee1da173d"
            }
          ],
          "repo": "https://github.com/millert/sudo",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write \"ALL ALL=(ALL) NOPASSWD:ALL\" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers",
  "id": "CVE-2019-18684",
  "modified": "2026-03-13T21:53:25.561954571Z",
  "published": "2019-11-04T16:15:11.437Z",
  "references": [
    {
      "type": "EVIDENCE",
      "url": "https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}