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Security advisory

Type: advisorySources: OSVCVE: CVE-2019-18634

In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2019-18634
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 07:36 UTC · Revision 1

Source evidence

CVE-2019-18634

core-osv · Original source

Published 29 Jan 2020, 18:15 UTC

In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.

osv:CVE-2019-18634
Complete source record
{
  "id": "7d2158f68d8eef601d9cad5d18be01a4630d764c61e04df10b0dd2432561ce1f",
  "url": "https://osv.dev/vulnerability/CVE-2019-18634",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-18634",
    "summary": "In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.",
    "evidence": "osv:CVE-2019-18634",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-18634",
      "aliases": [
        "CVE-2019-18634"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/millert/sudo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e65ec1438af67aadc32e704e84a9aadb91edff89"
                },
                {
                  "fixed": "2ac9985106850dbac6e088cc63d46bcea2c9217a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.7.1"
                      },
                      {
                        "fixed": "1.8.26"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "SUDO_1_8_25p1",
            "SUDO_1_8_25",
            "SUDO_1_8_24",
            "SUDO_1_8_23",
            "SUDO_1_8_22",
            "SUDO_1_8_21p2",
            "SUDO_1_8_21p1",
            "SUDO_1_8_21",
            "SUDO_1_8_20p2",
            "SUDO_1_8_20p1",
            "SUDO_1_8_20",
            "SUDO_1_8_19p2",
            "SUDO_1_8_19p1",
            "SUDO_1_8_19",
            "SUDO_1_8_18p1",
            "SUDO_1_8_18",
            "SUDO_1_8_17p1",
            "SUDO_1_8_17",
            "SUDO_1_8_16",
            "SUDO_1_8_15",
            "SUDO_1_8_14p3",
            "SUDO_1_8_14p1",
            "SUDO_1_8_14",
            "SUDO_1_8_13",
            "SUDO_1_8_12",
            "SUDO_1_8_11p2",
            "SUDO_1_8_11p1",
            "SUDO_1_8_11",
            "SUDO_1_8_10p3",
            "SUDO_1_8_10p2",
            "SUDO_1_8_10p1",
            "SUDO_1_8_10",
            "SUDO_1_8_9p5",
            "SUDO_1_8_9p4",
            "SUDO_1_8_9p3",
            "SUDO_1_8_9p2",
            "SUDO_1_8_9p1",
            "SUDO_1_8_9",
            "SUDO_1_8_8",
            "SUDO_1_8_7",
            "SUDO_1_8_6p8",
            "SUDO_1_8_6p7",
            "SUDO_1_8_6p6",
            "SUDO_1_8_6p5",
            "SUDO_1_8_6p4",
            "SUDO_1_8_6p3",
            "SUDO_1_8_6p2",
            "SUDO_1_8_6p1",
            "SUDO_1_8_6",
            "SUDO_1_8_5p3",
            "SUDO_1_8_5p2",
            "SUDO_1_8_5p1",
            "SUDO_1_8_5",
            "SUDO_1_8_4p5",
            "SUDO_1_8_4p4",
            "SUDO_1_8_4p3",
            "SUDO_1_8_4p2",
            "SUDO_1_8_4p1",
            "SUDO_1_8_4",
            "SUDO_1_8_3",
            "SUDO_1_8_2",
            "SUDO_1_8_1",
            "SUDO_1_8_0",
            "SUDO_1_7_2",
            "SUDO_1_7_1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18634.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/sudo-project/sudo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e65ec1438af67aadc32e704e84a9aadb91edff89"
                },
                {
                  "fixed": "2ac9985106850dbac6e088cc63d46bcea2c9217a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.7.1"
                      },
                      {
                        "fixed": "1.8.26"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.8.25p1",
            "SUDO_1_8_25p1",
            "v1.8.25",
            "SUDO_1_8_25",
            "v1.8.24",
            "SUDO_1_8_24",
            "v1.8.23",
            "SUDO_1_8_23",
            "v1.8.22",
            "SUDO_1_8_22",
            "v1.8.21p2",
            "SUDO_1_8_21p2",
            "v1.8.21p1",
            "SUDO_1_8_21p1",
            "v1.8.21",
            "SUDO_1_8_21",
            "v1.8.20p2",
            "SUDO_1_8_20p2",
            "v1.8.20p1",
            "SUDO_1_8_20p1",
            "v1.8.20",
            "SUDO_1_8_20",
            "v1.8.19p2",
            "SUDO_1_8_19p2",
            "v1.8.19p1",
            "SUDO_1_8_19p1",
            "v1.8.19",
            "SUDO_1_8_19",
            "v1.8.18p1",
            "SUDO_1_8_18p1",
            "v1.8.18",
            "SUDO_1_8_18",
            "v1.8.17p1",
            "SUDO_1_8_17p1",
            "v1.8.17",
            "SUDO_1_8_17",
            "v1.8.16",
            "SUDO_1_8_16",
            "v1.8.15",
            "SUDO_1_8_15",
            "v1.8.14p3",
            "SUDO_1_8_14p3",
            "v1.8.14p1",
            "SUDO_1_8_14p1",
            "v1.8.14",
            "SUDO_1_8_14",
            "v1.8.13",
            "SUDO_1_8_13",
            "v1.8.12",
            "SUDO_1_8_12",
            "v1.8.11p2",
            "SUDO_1_8_11p2",
            "v1.8.11p1",
            "SUDO_1_8_11p1",
            "v1.8.11",
            "SUDO_1_8_11",
            "v1.8.10p3",
            "SUDO_1_8_10p3",
            "v1.8.10p2",
            "SUDO_1_8_10p2",
            "v1.8.10p1",
            "SUDO_1_8_10p1",
            "v1.8.10",
            "SUDO_1_8_10",
            "v1.8.9p5",
            "SUDO_1_8_9p5",
            "v1.8.9p4",
            "SUDO_1_8_9p4",
            "v1.8.9p3",
            "SUDO_1_8_9p3",
            "v1.8.9p2",
            "SUDO_1_8_9p2",
            "v1.8.9p1",
            "SUDO_1_8_9p1",
            "v1.8.9",
            "SUDO_1_8_9",
            "v1.8.8",
            "SUDO_1_8_8",
            "v1.8.7",
            "SUDO_1_8_7",
            "v1.8.6p8",
            "SUDO_1_8_6p8",
            "v1.8.6p7",
            "SUDO_1_8_6p7",
            "v1.8.6p6",
            "SUDO_1_8_6p6",
            "v1.8.6p5",
            "SUDO_1_8_6p5",
            "v1.8.6p4",
            "SUDO_1_8_6p4",
            "v1.8.6p3",
            "SUDO_1_8_6p3",
            "v1.8.6p2",
            "SUDO_1_8_6p2",
            "v1.8.6p1",
            "SUDO_1_8_6p1",
            "v1.8.6",
            "SUDO_1_8_6",
            "v1.8.5p3",
            "SUDO_1_8_5p3",
            "v1.8.5p2",
            "SUDO_1_8_5p2",
            "v1.8.5p1",
            "SUDO_1_8_5p1",
            "v1.8.5",
            "SUDO_1_8_5",
            "v1.8.4p5",
            "SUDO_1_8_4p5",
            "v1.8.4p4",
            "SUDO_1_8_4p4",
            "v1.8.4p3",
            "SUDO_1_8_4p3",
            "v1.8.4p2",
            "SUDO_1_8_4p2",
            "v1.8.4p1",
            "SUDO_1_8_4p1",
            "v1.8.4",
            "SUDO_1_8_4",
            "v1.8.3",
            "SUDO_1_8_3",
            "v1.8.2",
            "SUDO_1_8_2",
            "v1.8.1",
            "SUDO_1_8_1",
            "v1.8.0",
            "SUDO_1_8_0",
            "v1.7.2",
            "SUDO_1_7_2",
            "v1.7.1",
            "SUDO_1_7_1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18634.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:55.728884828Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/",
        "https://usn.ubuntu.com/4263-1/",
        "https://usn.ubuntu.com/4263-2/",
        "https://access.redhat.com/errata/RHSA-2020:0487",
        "https://access.redhat.com/errata/RHSA-2020:0509",
        "https://access.redhat.com/errata/RHSA-2020:0540",
        "https://access.redhat.com/errata/RHSA-2020:0726",
        "https://lists.debian.org/debian-lts-announce/2020/02/msg00002.html",
        "https://seclists.org/bugtraq/2020/Feb/2",
        "https://seclists.org/bugtraq/2020/Feb/3",
        "https://seclists.org/bugtraq/2020/Jan/44",
        "https://security.gentoo.org/glsa/202003-12",
        "https://security.netapp.com/advisory/ntap-20200210-0001/",
        "https://support.apple.com/kb/HT210919",
        "https://www.debian.org/security/2020/dsa-4614",
        "https://www.sudo.ws/security.html",
        "https://www.sudo.ws/alerts/pwfeedback.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.0"
                  },
                  {
                    "last_affected": "8.0"
                  },
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  },
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2019-18634",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438487,
  "published_at": "2020-01-29T18:15:12.247+00:00"
}