{
  "cveId": "CVE-2023-31137",
  "url": "https://patchblox.com/security/cve/CVE-2023-31137",
  "summary": "CVE-2023-31137 is fixed in 5 products on 1 platform, first by duende 2.0.13-1.2ubuntu0.1~esm1, released May 9, 2023. It is not reported as exploited. Patch Radar priority: High.",
  "title": "maradns: MaraDNS is open-source software that implements the Domain Name System (DNS)",
  "description": "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 \u0060decomp_get_rddata\u0060 function within the \u0060Decompress.c\u0060 file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the \u0060rdlength\u0060 is smaller than \u0060rdata\u0060, the result of the line \u0060Decompress.c:886\u0060 is a negative number \u0060len = rdlength - total;\u0060. This value is then passed to the \u0060decomp_append_bytes\u0060 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 \u0060Decompress.c:887\u0060 by breaking \u0060if(len \u003C= 0)\u0060, which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.",
  "published": "2023-05-09T07:15:00Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.01143,
  "epssPercentile": 0.66918,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "duende",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.0.13-1.2ubuntu0.1~esm1",
      "fix": "duende 2.0.13-1.2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-duende-2.0.13-1.2ubuntu0.1-esm1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "duende",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "fix": "duende 2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-duende-2.0.13-1.4-deb11u1build0.20.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "duende",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "fix": "duende 2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-duende-2.0.13-1.4-deb11u1build0.22.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns",
      "release": "Debian 11.6 (bullseye)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1",
      "fix": "DEBIAN-CVE-2023-31137",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-31137",
      "released": "2023-05-09T14:15:13Z"
    },
    {
      "platform": "linux",
      "product": "maradns",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.0.13-1.2ubuntu0.1~esm1",
      "fix": "maradns 2.0.13-1.2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-maradns-2.0.13-1.2ubuntu0.1-esm1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "fix": "maradns 2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-maradns-2.0.13-1.4-deb11u1build0.20.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "fix": "maradns 2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-maradns-2.0.13-1.4-deb11u1build0.22.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-deadwood",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.0.13-1.2ubuntu0.1~esm1",
      "fix": "maradns-deadwood 2.0.13-1.2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-maradns-deadwood-2.0.13-1.2ubuntu0.1-esm1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-deadwood",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "fix": "maradns-deadwood 2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-maradns-deadwood-2.0.13-1.4-deb11u1build0.20.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-deadwood",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "fix": "maradns-deadwood 2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-maradns-deadwood-2.0.13-1.4-deb11u1build0.22.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-docs",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.0.13-1.2ubuntu0.1~esm1",
      "fix": "maradns-docs 2.0.13-1.2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-maradns-docs-2.0.13-1.2ubuntu0.1-esm1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-docs",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "fix": "maradns-docs 2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-maradns-docs-2.0.13-1.4-deb11u1build0.20.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-docs",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "fix": "maradns-docs 2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-maradns-docs-2.0.13-1.4-deb11u1build0.22.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-zoneserver",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.0.13-1.2ubuntu0.1~esm1",
      "fix": "maradns-zoneserver 2.0.13-1.2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-maradns-zoneserver-2.0.13-1.2ubuntu0.1-esm1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-zoneserver",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "fix": "maradns-zoneserver 2.0.13-1.4\u002Bdeb11u1build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-maradns-zoneserver-2.0.13-1.4-deb11u1build0.20.04.1",
      "released": "2023-05-09T07:15:00Z"
    },
    {
      "platform": "linux",
      "product": "maradns-zoneserver",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "fix": "maradns-zoneserver 2.0.13-1.4\u002Bdeb11u1build0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-maradns-zoneserver-2.0.13-1.4-deb11u1build0.22.04.1",
      "released": "2023-05-09T07:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}