UBUNTU-CVE-2020-8617 (CVE-2020-8617)

Vulnerability from osv_ubuntu – Published: 2020-05-19 00:00 – Updated: 2026-04-22 07:39 – Source website
VLAI
Details

Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/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": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "host",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "libbind9-90",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "libdns100",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "libisc95",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "libisccc90",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "libisccfg90",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "liblwres90",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          },
          {
            "binary_name": "lwresd",
            "binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.9.5.dfsg-3ubuntu0.19+esm2?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.9.5.dfsg-3ubuntu0.19+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.9.3.dfsg.P2-4ubuntu1",
        "1:9.9.3.dfsg.P2-4ubuntu2",
        "1:9.9.3.dfsg.P2-4ubuntu3",
        "1:9.9.5.dfsg-2",
        "1:9.9.5.dfsg-3",
        "1:9.9.5.dfsg-3ubuntu0.1",
        "1:9.9.5.dfsg-3ubuntu0.2",
        "1:9.9.5.dfsg-3ubuntu0.3",
        "1:9.9.5.dfsg-3ubuntu0.4",
        "1:9.9.5.dfsg-3ubuntu0.5",
        "1:9.9.5.dfsg-3ubuntu0.6",
        "1:9.9.5.dfsg-3ubuntu0.7",
        "1:9.9.5.dfsg-3ubuntu0.8",
        "1:9.9.5.dfsg-3ubuntu0.9",
        "1:9.9.5.dfsg-3ubuntu0.10",
        "1:9.9.5.dfsg-3ubuntu0.11",
        "1:9.9.5.dfsg-3ubuntu0.12",
        "1:9.9.5.dfsg-3ubuntu0.13",
        "1:9.9.5.dfsg-3ubuntu0.14",
        "1:9.9.5.dfsg-3ubuntu0.15",
        "1:9.9.5.dfsg-3ubuntu0.16",
        "1:9.9.5.dfsg-3ubuntu0.17",
        "1:9.9.5.dfsg-3ubuntu0.18",
        "1:9.9.5.dfsg-3ubuntu0.19",
        "1:9.9.5.dfsg-3ubuntu0.19+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "host",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libbind9-140",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libdns-export162",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libdns162",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libirs-export141",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libirs141",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libisc-export160",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libisc160",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libisccc-export140",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libisccc140",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libisccfg-export140",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "libisccfg140",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "liblwres141",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          },
          {
            "binary_name": "lwresd",
            "binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.16"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.10.3.dfsg.P4-8ubuntu1.16?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.10.3.dfsg.P4-8ubuntu1.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.9.5.dfsg-11ubuntu1",
        "1:9.9.5.dfsg-12",
        "1:9.9.5.dfsg-12.1",
        "1:9.9.5.dfsg-12.1ubuntu1",
        "1:9.10.3.dfsg.P2-4",
        "1:9.10.3.dfsg.P2-5",
        "1:9.10.3.dfsg.P4-3",
        "1:9.10.3.dfsg.P4-4",
        "1:9.10.3.dfsg.P4-5",
        "1:9.10.3.dfsg.P4-8",
        "1:9.10.3.dfsg.P4-8ubuntu1",
        "1:9.10.3.dfsg.P4-8ubuntu1.1",
        "1:9.10.3.dfsg.P4-8ubuntu1.2",
        "1:9.10.3.dfsg.P4-8ubuntu1.3",
        "1:9.10.3.dfsg.P4-8ubuntu1.4",
        "1:9.10.3.dfsg.P4-8ubuntu1.5",
        "1:9.10.3.dfsg.P4-8ubuntu1.6",
        "1:9.10.3.dfsg.P4-8ubuntu1.7",
        "1:9.10.3.dfsg.P4-8ubuntu1.8",
        "1:9.10.3.dfsg.P4-8ubuntu1.9",
        "1:9.10.3.dfsg.P4-8ubuntu1.10",
        "1:9.10.3.dfsg.P4-8ubuntu1.11",
        "1:9.10.3.dfsg.P4-8ubuntu1.12",
        "1:9.10.3.dfsg.P4-8ubuntu1.14",
        "1:9.10.3.dfsg.P4-8ubuntu1.15"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libbind9-160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libdns-export1100",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libdns1100",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libirs-export160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libirs160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libisc-export169",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libisc169",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libisccc-export160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libisccc160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libisccfg-export160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "libisccfg160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          },
          {
            "binary_name": "liblwres160",
            "binary_version": "1:9.11.3+dfsg-1ubuntu1.12"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.11.3+dfsg-1ubuntu1.12?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.11.3+dfsg-1ubuntu1.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.10.3.dfsg.P4-12.6ubuntu1",
        "1:9.11.2.P1-1ubuntu2",
        "1:9.11.2.P1-1ubuntu3",
        "1:9.11.2.P1-1ubuntu4",
        "1:9.11.2.P1-1ubuntu5",
        "1:9.11.3+dfsg-1ubuntu1",
        "1:9.11.3+dfsg-1ubuntu1.1",
        "1:9.11.3+dfsg-1ubuntu1.2",
        "1:9.11.3+dfsg-1ubuntu1.3",
        "1:9.11.3+dfsg-1ubuntu1.5",
        "1:9.11.3+dfsg-1ubuntu1.7",
        "1:9.11.3+dfsg-1ubuntu1.8",
        "1:9.11.3+dfsg-1ubuntu1.9",
        "1:9.11.3+dfsg-1ubuntu1.10",
        "1:9.11.3+dfsg-1ubuntu1.11"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          },
          {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          },
          {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          },
          {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.16.1-0ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.16.1-0ubuntu2.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.16.1-0ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.11.5.P4+dfsg-5.1ubuntu2",
        "1:9.11.5.P4+dfsg-5.1ubuntu3",
        "1:9.11.5.P4+dfsg-5.1ubuntu4",
        "1:9.11.5.P4+dfsg-5.1ubuntu5",
        "1:9.11.14+dfsg-1ubuntu1",
        "1:9.11.14+dfsg-3ubuntu1",
        "1:9.16.0-1ubuntu3",
        "1:9.16.0-1ubuntu4",
        "1:9.16.0-1ubuntu5",
        "1:9.16.1-0ubuntu1",
        "1:9.16.1-0ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.",
  "id": "UBUNTU-CVE-2020-8617",
  "modified": "2026-04-22T07:39:19Z",
  "published": "2020-05-19T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8617"
    },
    {
      "type": "REPORT",
      "url": "https://kb.isc.org/docs/cve-2020-8617"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4365-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4365-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-8617"
    }
  ],
  "related": [
    "USN-4365-1",
    "USN-4365-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/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-2020-8617"
  ]
}



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