{
  "schema_version": "1.7.0",
  "id": "USN-4698-2",
  "summary": "dnsmasq regression",
  "details": "USN-4698-1 fixed vulnerabilities in Dnsmasq. The updates introduced\nregressions in certain environments related to issues with multiple\nqueries, and issues with retries. This update fixes the problem.\n\nOriginal advisory details:\n\n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled\n memory when sorting RRsets. A remote attacker could use this issue to cause\n Dnsmasq to hang, resulting in a denial of service, or possibly execute\n arbitrary code. (CVE-2020-25681, CVE-2020-25687)\n \n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled\n extracting certain names. A remote attacker could use this issue to cause\n Dnsmasq to hang, resulting in a denial of service, or possibly execute\n arbitrary code. (CVE-2020-25682, CVE-2020-25683)\n \n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly\n implemented address/port checks. A remote attacker could use this issue to\n perform a cache poisoning attack. (CVE-2020-25684)\n \n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly\n implemented query resource name checks. A remote attacker could use this\n issue to perform a cache poisoning attack. (CVE-2020-25685)\n \n Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled\n multiple query requests for the same resource name. A remote attacker could\n use this issue to perform a cache poisoning attack. (CVE-2020-25686)\n \n It was discovered that Dnsmasq incorrectly handled memory during DHCP\n response creation. A remote attacker could possibly use this issue to\n cause Dnsmasq to consume resources, leading to a denial of service. This\n issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04\n LTS. (CVE-2019-14834)\n",
  "aliases": [],
  "upstream": [],
  "related": [],
  "published": "2021-02-24T13:43:44Z",
  "modified": "2026-02-10T04:42:02Z",
  "affected": [
    {
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.75-1ubuntu0.16.04.8?arch=source&distro=xenial"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.75-1ubuntu0.16.04.8"
            }
          ]
        }
      ],
      "versions": [
        "2.75-1",
        "2.75-1ubuntu0.16.04.1",
        "2.75-1ubuntu0.16.04.2",
        "2.75-1ubuntu0.16.04.3",
        "2.75-1ubuntu0.16.04.4",
        "2.75-1ubuntu0.16.04.5",
        "2.75-1ubuntu0.16.04.7"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.75-1ubuntu0.16.04.8"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.75-1ubuntu0.16.04.8"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.75-1ubuntu0.16.04.8"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:16.04:LTS",
          "cves": []
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.79-1ubuntu0.3?arch=source&distro=bionic"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.79-1ubuntu0.3"
            }
          ]
        }
      ],
      "versions": [
        "2.78-1",
        "2.78-3",
        "2.79-1",
        "2.79-1ubuntu0.2"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.79-1ubuntu0.3"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.79-1ubuntu0.3"
          },
          {
            "binary_name": "dnsmasq-base-lua",
            "binary_version": "2.79-1ubuntu0.3"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.79-1ubuntu0.3"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:18.04:LTS",
          "cves": []
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "dnsmasq",
        "purl": "pkg:deb/ubuntu/dnsmasq@2.80-1.1ubuntu1.3?arch=source&distro=focal"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.80-1.1ubuntu1.3"
            }
          ]
        }
      ],
      "versions": [
        "2.80-1ubuntu2",
        "2.80-1ubuntu4",
        "2.80-1.1ubuntu1",
        "2.80-1.1ubuntu1.2"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dnsmasq",
            "binary_version": "2.80-1.1ubuntu1.3"
          },
          {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.80-1.1ubuntu1.3"
          },
          {
            "binary_name": "dnsmasq-base-lua",
            "binary_version": "2.80-1.1ubuntu1.3"
          },
          {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.80-1.1ubuntu1.3"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:20.04:LTS",
          "cves": []
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4698-2"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/bugs/1916462"
    }
  ]
}