GHSA-HXMP-PQCH-C8MM

Vulnerability from github – Published: 2020-12-09 18:21 – Updated: 2024-09-24 17:44
VLAI?
Summary
Denial of service attack via incorrect parameters in Matrix Synapse
Details

Impact

A malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a /send_join, /send_leave, /invite or /exchange_third_party_invite request.

This can lead to a denial of service in which future events will not be correctly sent to other servers over federation.

This affects any server which accepts federation requests from untrusted servers.

Patches

Issue is resolved by https://github.com/matrix-org/synapse/pull/8776.

Workarounds

Homeserver administrators could limit access to the federation API to trusted servers (for example via federation_domain_whitelist).

Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.23.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-26257"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-74",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-12-09T18:21:17Z",
    "nvd_published_at": "2020-12-09T19:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or `/exchange_third_party_invite` request.\n\nThis can lead to a denial of service in which future events will not be correctly sent to other servers over federation.\n\nThis affects any server which accepts federation requests from untrusted servers.\n\n### Patches\n\nIssue is resolved by https://github.com/matrix-org/synapse/pull/8776.\n\n### Workarounds\n\nHomeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).",
  "id": "GHSA-hxmp-pqch-c8mm",
  "modified": "2024-09-24T17:44:50Z",
  "published": "2020-12-09T18:21:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-hxmp-pqch-c8mm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26257"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/pull/8776"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/blob/develop/CHANGES.md#synapse-1231-2020-12-09"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-236.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DBTIU3ZNBFWZ56V4X7JIAD33V5H2GOMC"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QR4MMYZKX5N5GYGH4H5LBUUC5TLAFHI7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Denial of service attack via incorrect parameters in Matrix Synapse"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.