pysec-2021-132
Vulnerability from pysec
Published
2021-02-26 18:15
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 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the federation_domain_whitelist setting can be used to restrict the homeservers communicated with over federation.

Aliases


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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse",
        "purl": "pkg:pypi/matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ff5c4da1289cb5e097902b3e55b771be342c29d6"
            }
          ],
          "repo": "https://github.com/matrix-org/synapse",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0.99.0"
            },
            {
              "fixed": "1.25.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.99.0",
        "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",
        "1.25.0rc1",
        "1.3.0",
        "1.3.0rc1",
        "1.3.1",
        "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-2021-21274",
    "GHSA-2hwx-mjrm-v3g8"
  ],
  "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 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the `federation_domain_whitelist` setting can be used to restrict the homeservers communicated with over federation.",
  "id": "PYSEC-2021-132",
  "modified": "2021-08-27T03:22:06.616674Z",
  "published": "2021-02-26T18:15:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/releases/tag/v1.25.0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/pull/8950"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8"
    }
  ]
}


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