UBUNTU-CVE-2023-31137 (CVE-2023-31137)

Vulnerability from osv_ubuntu – Published: 2023-05-09 14:15 – Updated: 2025-09-08 16:56 – Source website
VLAI
Details

MaraDNS is open-source software that implements the Domain Name System (DNS). In version 3.5.0024 and prior, a remotely exploitable integer underflow vulnerability in the DNS packet decompression function allows an attacker to cause a Denial of Service by triggering an abnormal program termination. The vulnerability exists in the decomp_get_rddata function within the Decompress.c file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the rdlength is smaller than rdata, the result of the line Decompress.c:886 is a negative number len = rdlength - total;. This value is then passed to the decomp_append_bytes function without proper validation, causing the program to attempt to allocate a massive chunk of memory that is impossible to allocate. Consequently, the program exits with an error code of 64, causing a Denial of Service. One proposed fix for this vulnerability is to patch Decompress.c:887 by breaking if(len <= 0), which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.

Severity
7.5 (High)
CVSS:3.1/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": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "duende",
            "binary_version": "2.0.13-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns",
            "binary_version": "2.0.13-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns-deadwood",
            "binary_version": "2.0.13-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns-docs",
            "binary_version": "2.0.13-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns-zoneserver",
            "binary_version": "2.0.13-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "maradns",
        "purl": "pkg:deb/ubuntu/maradns@2.0.13-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.13-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.11-1",
        "2.0.13-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "duende",
            "binary_version": "2.0.13-1.2ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns",
            "binary_version": "2.0.13-1.2ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns-deadwood",
            "binary_version": "2.0.13-1.2ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns-docs",
            "binary_version": "2.0.13-1.2ubuntu0.1~esm1"
          },
          {
            "binary_name": "maradns-zoneserver",
            "binary_version": "2.0.13-1.2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "maradns",
        "purl": "pkg:deb/ubuntu/maradns@2.0.13-1.2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.13-1.2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.13-1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "duende",
            "binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
          },
          {
            "binary_name": "maradns",
            "binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
          },
          {
            "binary_name": "maradns-deadwood",
            "binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
          },
          {
            "binary_name": "maradns-docs",
            "binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
          },
          {
            "binary_name": "maradns-zoneserver",
            "binary_version": "2.0.13-1.4+deb11u1build0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "maradns",
        "purl": "pkg:deb/ubuntu/maradns@2.0.13-1.4+deb11u1build0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.13-1.4+deb11u1build0.20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.13-1.2build1",
        "2.0.13-1.4",
        "2.0.13-1.4build1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "duende",
            "binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
          },
          {
            "binary_name": "maradns",
            "binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
          },
          {
            "binary_name": "maradns-deadwood",
            "binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
          },
          {
            "binary_name": "maradns-docs",
            "binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
          },
          {
            "binary_name": "maradns-zoneserver",
            "binary_version": "2.0.13-1.4+deb11u1build0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "maradns",
        "purl": "pkg:deb/ubuntu/maradns@2.0.13-1.4+deb11u1build0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.13-1.4+deb11u1build0.22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.13-1.4build2"
      ]
    }
  ],
  "aliases": [],
  "details": "MaraDNS is open-source software that implements the Domain Name System (DNS). In version 3.5.0024 and prior, a remotely exploitable integer underflow vulnerability in the DNS packet decompression function allows an attacker to cause a Denial of Service by triggering an abnormal program termination. The vulnerability exists in the `decomp_get_rddata` function within the `Decompress.c` file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the `rdlength` is smaller than `rdata`, the result of the line `Decompress.c:886` is a negative number `len = rdlength - total;`. This value is then passed to the `decomp_append_bytes` function without proper validation, causing the program to attempt to allocate a massive chunk of memory that is impossible to allocate. Consequently, the program exits with an error code of 64, causing a Denial of Service. One proposed fix for this vulnerability is to patch `Decompress.c:887` by breaking `if(len \u003c= 0)`, which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.",
  "id": "UBUNTU-CVE-2023-31137",
  "modified": "2025-09-08T16:56:16Z",
  "published": "2023-05-09T14:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-31137"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/samboy/MaraDNS/security/advisories/GHSA-58m7-826v-9c3c"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/samboy/MaraDNS/commit/bab062bde40b2ae8a91eecd522e84d8b993bab58"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/samboy/MaraDNS/blob/08b21ea20d80cedcb74aa8f14979ec7c61846663/dns/Decompress.c#L886"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6271-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-31137"
    }
  ],
  "related": [
    "USN-6271-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/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-2023-31137"
  ]
}



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