ghsa-jhjh-776m-4765
Vulnerability from github
Published
2022-08-31 21:25
Modified
2024-09-30 20:26
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
Denial of service due to incorrect application of event authorization rules
Details

Impact

The Matrix specification specifies a list of event authorization rules which must be checked when determining if an event should be accepted into a room.

In versions of Synapse up to and including v1.61, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers.

Patches

Administrators of homeservers with federation enabled are advised to upgrade to v1.62.0 or higher.

Workarounds

References

  • https://github.com/matrix-org/synapse/pull/13087
  • https://github.com/matrix-org/synapse/pull/13088

For more information

If you have any questions or comments about this advisory, e-mail us at security@matrix.org.

Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.62.0rc1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-31152"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-703",
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-08-31T21:25:37Z",
    "nvd_published_at": "2022-09-02T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.3/rooms/v10/#authorization-rules) which must be checked when determining if an event should be accepted into a room.\n\nIn versions of Synapse up to and including v1.61, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers.\n\n### Patches\n\nAdministrators of homeservers with federation enabled are advised to upgrade to v1.62.0 or higher.\n\n### Workarounds\n\n * Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`).\n\n### References\n\n * https://github.com/matrix-org/synapse/pull/13087\n * https://github.com/matrix-org/synapse/pull/13088\n\n### For more information\n\nIf you have any questions or comments about this advisory, e-mail us at [security@matrix.org](mailto:security@matrix.org).",
  "id": "GHSA-jhjh-776m-4765",
  "modified": "2024-09-30T20:26:48Z",
  "published": "2022-08-31T21:25:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-31152"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/pull/13087"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/pull/13088"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/d4b1c0d800eaa83c4d56a9cf17881ad362b9194b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/e16ea87d0f8c4c30cad36f85488eb1f647e640b0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/synapse"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/releases/tag/v1.62.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2022-262.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Denial of service due to incorrect application of event authorization rules"
}


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