{"id":"CVE-2019-18684","aliases":["BELL-CVE-2019-18684","EUVD-2019-8398","GHSA-h9q8-53pc-hhxf"],"status":"disputed","title":"Sudo through 1.8.29 allows local users to escalate to root if they have write access to file...","description":"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","severity":{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00294,"percentile":0.22139,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-362"],"published":"2019-11-04T15:53:31Z","modified":"2026-10-24T10:30:41Z","products":[{"vendor":"sudo_project","product":"sudo"}],"references":[{"url":"https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-18684"},{"url":"https://github.com/advisories/GHSA-h9q8-53pc-hhxf"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2019-18684","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2019-18684","description":"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","status":"disputed","published":"2019-11-04T15:53:31Z","modified":"2024-08-05T02:02:38.29Z","updated_at":"2026-11-02T14:32:23.485011Z"}],"euvd":[{"id":"EUVD-2019-8398","description":"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","status":"published","published":"2019-11-04T15:53:31Z","modified":"2024-08-05T02:02:38Z","updated_at":"2026-11-03T02:40:27.733219Z"}],"ghsa":[{"id":"GHSA-h9q8-53pc-hhxf","title":"Sudo through 1.8.29 allows local users to escalate to root if they have write access to file...","description":"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.","status":"published","published":"2022-05-24T17:00:18Z","modified":"2024-03-30T05:01:44Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:55:45.190481Z"}],"nvd":[{"id":"CVE-2019-18684","description":"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","status":"disputed","published":"2019-11-04T16:15:11.437Z","modified":"2026-06-17T02:25:17.877Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.9,"vector":"AV:L/AC:M/Au:N/C:C/I:C/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:05:32.982925Z"}],"osv":[{"id":"BELL-CVE-2019-18684","title":"CVE-2019-18684 does not affect BellSoft software","status":"withdrawn","published":"2019-11-04T16:15:00Z","modified":"2026-01-26T09:45:56.910371Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:15.340685Z"},{"id":"CVE-2019-18684","description":"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","status":"published","published":"2019-11-04T16:15:11.437Z","modified":"2026-10-24T10:30:41.545655119Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:11.673963Z"}]}}