pysec-2021-135
Vulnerability from pysec
Published
2021-05-11 15:15
Modified
2021-08-27 03:22
Details

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 "Push rules" can specify conditions under which they will match, including event_match, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.

Impacted products
Name purl
matrix-synapse pkg:pypi/matrix-synapse
Aliases


To clipboard 

{
   affected: [
      {
         package: {
            ecosystem: "PyPI",
            name: "matrix-synapse",
            purl: "pkg:pypi/matrix-synapse",
         },
         ranges: [
            {
               events: [
                  {
                     introduced: "0",
                  },
                  {
                     fixed: "03318a766cac9f8b053db2214d9c332a977d226c",
                  },
               ],
               repo: "https://github.com/matrix-org/synapse",
               type: "GIT",
            },
            {
               events: [
                  {
                     introduced: "0",
                  },
                  {
                     fixed: "1.33.2",
                  },
               ],
               type: "ECOSYSTEM",
            },
         ],
         versions: [
            "0.33.5",
            "0.33.5.1",
            "0.33.6",
            "0.33.6rc1",
            "0.33.7",
            "0.33.7rc1",
            "0.33.7rc2",
            "0.33.8",
            "0.33.8rc2",
            "0.33.9",
            "0.34.0",
            "0.34.0.1",
            "0.34.0rc1",
            "0.34.0rc2",
            "0.34.1.1",
            "0.99.0",
            "0.99.0rc1",
            "0.99.0rc2",
            "0.99.0rc3",
            "0.99.0rc4",
            "0.99.1",
            "0.99.1.1",
            "0.99.1rc1",
            "0.99.1rc2",
            "0.99.2",
            "0.99.2rc1",
            "0.99.3",
            "0.99.3.1",
            "0.99.3.2",
            "0.99.3rc1",
            "0.99.4",
            "0.99.4rc1",
            "0.99.5",
            "0.99.5.1",
            "0.99.5.2",
            "0.99.5rc1",
            "1.0.0",
            "1.0.0rc1",
            "1.0.0rc2",
            "1.0.0rc3",
            "1.1.0",
            "1.1.0rc1",
            "1.1.0rc2",
            "1.10.0",
            "1.10.0rc1",
            "1.10.0rc2",
            "1.10.0rc3",
            "1.10.0rc5",
            "1.10.1",
            "1.11.0",
            "1.11.0rc1",
            "1.11.1",
            "1.12.0",
            "1.12.0rc1",
            "1.12.1",
            "1.12.1rc1",
            "1.12.2",
            "1.12.3",
            "1.12.4",
            "1.12.4rc1",
            "1.13.0",
            "1.13.0rc1",
            "1.13.0rc2",
            "1.13.0rc3",
            "1.14.0",
            "1.14.0rc1",
            "1.14.0rc2",
            "1.15.0",
            "1.15.0rc1",
            "1.15.1",
            "1.15.2",
            "1.16.0",
            "1.16.0rc1",
            "1.16.0rc2",
            "1.16.1",
            "1.17.0",
            "1.17.0rc1",
            "1.18.0",
            "1.18.0rc1",
            "1.18.0rc2",
            "1.19.0",
            "1.19.0rc1",
            "1.19.1",
            "1.19.1rc1",
            "1.19.2",
            "1.19.3",
            "1.2.0",
            "1.2.0rc1",
            "1.2.0rc2",
            "1.2.1",
            "1.20.0",
            "1.20.0rc1",
            "1.20.0rc2",
            "1.20.0rc3",
            "1.20.0rc4",
            "1.20.0rc5",
            "1.20.1",
            "1.21.0",
            "1.21.0rc1",
            "1.21.0rc2",
            "1.21.0rc3",
            "1.21.1",
            "1.21.2",
            "1.22.0",
            "1.22.0rc1",
            "1.22.0rc2",
            "1.22.1",
            "1.23.0",
            "1.23.0rc1",
            "1.23.1",
            "1.24.0",
            "1.24.0rc1",
            "1.24.0rc2",
            "1.25.0",
            "1.25.0rc1",
            "1.26.0",
            "1.26.0rc1",
            "1.26.0rc2",
            "1.27.0",
            "1.27.0rc1",
            "1.27.0rc2",
            "1.28.0",
            "1.28.0rc1",
            "1.29.0",
            "1.29.0rc1",
            "1.3.0",
            "1.3.0rc1",
            "1.3.1",
            "1.30.0",
            "1.30.0rc1",
            "1.30.1",
            "1.31.0",
            "1.31.0rc1",
            "1.32.0",
            "1.32.0rc1",
            "1.32.1",
            "1.32.2",
            "1.33.0",
            "1.33.0rc1",
            "1.33.0rc2",
            "1.33.1",
            "1.4.0",
            "1.4.0rc1",
            "1.4.0rc2",
            "1.4.1",
            "1.4.1rc1",
            "1.5.0",
            "1.5.0rc1",
            "1.5.0rc2",
            "1.5.1",
            "1.6.0",
            "1.6.0rc1",
            "1.6.0rc2",
            "1.6.1",
            "1.7.0",
            "1.7.0rc1",
            "1.7.0rc2",
            "1.7.1",
            "1.7.2",
            "1.7.3",
            "1.8.0",
            "1.8.0rc1",
            "1.9.0",
            "1.9.0.dev1",
            "1.9.0.dev2",
            "1.9.0rc1",
            "1.9.1",
         ],
      },
   ],
   aliases: [
      "CVE-2021-29471",
      "GHSA-x345-32rc-8h85",
   ],
   details: "Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 \"Push rules\" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.",
   id: "PYSEC-2021-135",
   modified: "2021-08-27T03:22:06.756710Z",
   published: "2021-05-11T15:15:00Z",
   references: [
      {
         type: "WEB",
         url: "https://github.com/matrix-org/synapse/releases/tag/v1.33.2",
      },
      {
         type: "ADVISORY",
         url: "https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85",
      },
      {
         type: "FIX",
         url: "https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c",
      },
   ],
}


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