ubuntu-cve-2019-19331
Vulnerability from osv_ubuntu
Published
2019-12-16 16:15
Modified
2026-04-22 07:39
Summary
Details

knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "knot-resolver",
            "binary_version": "1.0.0~beta3-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "knot-resolver",
        "purl": "pkg:deb/ubuntu/knot-resolver@1.0.0~beta3-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0~beta2-123-g6134920-1",
        "1.0.0~beta3-1",
        "1.0.0~beta3-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "knot-resolver",
            "binary_version": "2.1.1-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "knot-resolver-module-http",
            "binary_version": "2.1.1-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "libkres6",
            "binary_version": "2.1.1-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "knot-resolver",
        "purl": "pkg:deb/ubuntu/knot-resolver@2.1.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.3-1",
        "1.5.0-4",
        "1.5.1-1",
        "1.5.2-1",
        "2.0.0-3",
        "2.1.0-1",
        "2.1.0-2",
        "2.1.1-1",
        "2.1.1-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "knot-resolver",
            "binary_version": "3.2.1-3ubuntu2.2"
          },
          {
            "binary_name": "knot-resolver-module-http",
            "binary_version": "3.2.1-3ubuntu2.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "knot-resolver",
        "purl": "pkg:deb/ubuntu/knot-resolver@3.2.1-3ubuntu2.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.1-3ubuntu2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.1-3",
        "3.2.1-3ubuntu1",
        "3.2.1-3ubuntu2",
        "3.2.1-3ubuntu2.1"
      ]
    }
  ],
  "aliases": [],
  "details": "knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).",
  "id": "UBUNTU-CVE-2019-19331",
  "modified": "2026-04-22T07:39:11Z",
  "published": "2019-12-16T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-19331"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2019/12/04/4"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2019-19331"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7047-1"
    }
  ],
  "related": [
    "USN-7047-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2019-19331"
  ]
}



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