GHSA-45c3-73f7-pv4m — dnspython dns.name.from_wire_parser() excessive CPU use

dnspython dns.name.from_wire_parser() excessive CPU use

The advisory, in context

Impact

A maliciously crafted DNS message may cause dns.name.from_wire_parser() to use excessive CPU for DNS name decompression. Applications that process untrusted DNS wire form messages with dnspython may be degraded or DoS'd by the extra CPU use required.

Patches

This problem is fixed in dnspython 2.9.0.

Workarounds

There are no known workarounds.

Credit

Evgenios Gkritsis, Department of Informatics, University of Piraeus & Athena Research Center, Greece Constantinos Patsakis, Department of Informatics, University of Piraeus & Athena Research Center, Greece George Stergiopoulos, Department of Informatics, Athens University of Economics and Business, Greece

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

dnspython PyPI

Ecosystem versions

Earlier releases before 2.9.0

Fixed in 2.9.0

50 explicitly affected versions

1.0.0, 1.1.0, 1.10.0, 1.11.0, 1.11.1, 1.12.0, 1.13.0, 1.14.0, 1.15.0, 1.16.0, 1.2.0, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.4.0, 1.5.0, 1.6.0, 1.7.1, 1.8.0, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 2.0.0, 2.0.0rc1, 2.0.0rc2, 2.1.0, 2.1.0rc1, 2.2.0, 2.2.0rc1, 2.2.1, 2.3.0, 2.3.0rc1, 2.4.0, 2.4.0rc1, 2.4.1, 2.4.2, 2.5.0, 2.5.0rc1, 2.6.0, 2.6.0rc1, 2.6.1, 2.7.0, 2.7.0rc1, 2.8.0, 2.8.0rc1

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "0"
        },
        {
          "fixed": "2.9.0"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "1.0.0",
    "1.1.0",
    "1.10.0",
    "1.11.0",
    "1.11.1",
    "1.12.0",
    "1.13.0",
    "1.14.0",
    "1.15.0",
    "1.16.0",
    "1.2.0",
    "1.3.0",
    "1.3.1",
    "1.3.2",
    "1.3.3",
    "1.3.4",
    "1.3.5",
    "1.4.0",
    "1.5.0",
    "1.6.0",
    "1.7.1",
    "1.8.0",
    "1.9.0",
    "1.9.1",
    "1.9.2",
    "1.9.3",
    "1.9.4",
    "2.0.0",
    "2.0.0rc1",
    "2.0.0rc2",
    "2.1.0",
    "2.1.0rc1",
    "2.2.0",
    "2.2.0rc1",
    "2.2.1",
    "2.3.0",
    "2.3.0rc1",
    "2.4.0",
    "2.4.0rc1",
    "2.4.1",
    "2.4.2",
    "2.5.0",
    "2.5.0rc1",
    "2.6.0",
    "2.6.0rc1",
    "2.6.1",
    "2.7.0",
    "2.7.0rc1",
    "2.8.0",
    "2.8.0rc1"
  ]
}

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