Vulnerability-Lookup

GHSA-JHJH-776M-4765

Vulnerability from github – Published: 2022-08-31 21:25 – Updated: 2024-09-30 20:26

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

Federation can be disabled by setting federation_domain_whitelist to an empty list ([]).

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.

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

Show details on source website

JSON

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"
}

CVE-2022-31152 (GCVE-0-2022-31152)

Vulnerability from cvelistv5 – Published: 2022-09-02 20:00 – Updated: 2025-04-23 17:32

Title

Synapse vulnerable to denial of service (DoS) due to incorrect application of event authorization rules

Summary

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#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 version 1.61.0, 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. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. 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 (`[]`) as a workaround.

Severity

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-23 14:01 UTC

CWE

CWE-703 - Improper Check or Handling of Exceptional Conditions

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/matrix-org/synapse/security/ad…	x_refsource_CONFIRM
https://github.com/matrix-org/synapse/pull/13087	x_refsource_MISC
https://github.com/matrix-org/synapse/pull/13088	x_refsource_MISC
https://github.com/matrix-org/synapse/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
matrix-org	synapse	Affected: < 1.62.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T07:11:39.363Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/matrix-org/synapse/pull/13087"
          },
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            "tags": [
              "x_refsource_MISC",
              "x_transferred"
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          },
          {
            "tags": [
              "x_refsource_MISC",
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            "url": "https://github.com/matrix-org/synapse/releases/tag/v1.62.0"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-31152",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-23T14:01:29.840178Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-23T17:32:15.848Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "synapse",
          "vendor": "matrix-org",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.62.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#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 version 1.61.0, 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. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. 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 (`[]`) as a workaround."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-703",
              "description": "CWE-703: Improper Check or Handling of Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-09-02T20:00:16.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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        },
        {
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/matrix-org/synapse/pull/13087"
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          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/matrix-org/synapse/pull/13088"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/matrix-org/synapse/releases/tag/v1.62.0"
        }
      ],
      "source": {
        "advisory": "GHSA-jhjh-776m-4765",
        "discovery": "UNKNOWN"
      },
      "title": "Synapse vulnerable to denial of service (DoS) due to incorrect application of event authorization rules",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2022-31152",
          "STATE": "PUBLIC",
          "TITLE": "Synapse vulnerable to denial of service (DoS) due to incorrect application of event authorization rules"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "synapse",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 1.62.0"
                          }
                        ]
                      }
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                "vendor_name": "matrix-org"
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        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#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 version 1.61.0, 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. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. 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 (`[]`) as a workaround."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          }
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        "problemtype": {
          "problemtype_data": [
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              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-703: Improper Check or Handling of Exceptional Conditions"
                }
              ]
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        },
        "references": {
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              "refsource": "MISC",
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            },
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            }
          ]
        },
        "source": {
          "advisory": "GHSA-jhjh-776m-4765",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2022-31152",
    "datePublished": "2022-09-02T20:00:16.000Z",
    "dateReserved": "2022-05-18T00:00:00.000Z",
    "dateUpdated": "2025-04-23T17:32:15.848Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

PYSEC-2022-262

Vulnerability from pysec - Published: 2022-09-02 20:15 - Updated: 2022-09-09 06:19

Details

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. 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 version 1.61.0, 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. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting federation_domain_whitelist to an empty list ([]) as a workaround.

Impacted products

Name	purl
matrix-synapse	pkg:pypi/matrix-synapse

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse",
        "purl": "pkg:pypi/matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.62.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.33.5",
        "0.33.5.1",
        "0.33.6",
        "0.33.6rc1",
        "0.33.7",
        "0.33.7rc1",
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        "1.47.1",
        "1.48.0",
        "1.48.0rc1",
        "1.49.0",
        "1.49.0rc1",
        "1.49.2",
        "1.5.0",
        "1.5.0rc1",
        "1.5.0rc2",
        "1.5.1",
        "1.50.0",
        "1.50.0rc1",
        "1.50.0rc2",
        "1.50.1",
        "1.50.2",
        "1.51.0",
        "1.51.0rc1",
        "1.51.0rc2",
        "1.52.0",
        "1.52.0rc1",
        "1.53.0",
        "1.53.0rc1",
        "1.54.0",
        "1.54.0rc1",
        "1.55.0",
        "1.55.0rc1",
        "1.55.1",
        "1.55.2",
        "1.56.0",
        "1.56.0rc1",
        "1.57.0",
        "1.57.0rc1",
        "1.57.1",
        "1.58.0",
        "1.58.0rc2",
        "1.58.1",
        "1.59.0",
        "1.59.0rc1",
        "1.59.0rc2",
        "1.59.1",
        "1.6.0",
        "1.6.0rc1",
        "1.6.0rc2",
        "1.6.1",
        "1.60.0",
        "1.60.0rc1",
        "1.60.0rc2",
        "1.61.0",
        "1.61.0rc1",
        "1.61.1",
        "1.62.0rc1",
        "1.62.0rc2",
        "1.62.0rc3",
        "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-2022-31152",
    "GHSA-jhjh-776m-4765"
  ],
  "details": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#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 version 1.61.0, 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. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. 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 (`[]`) as a workaround.",
  "id": "PYSEC-2022-262",
  "modified": "2022-09-09T06:19:32.373264Z",
  "published": "2022-09-02T20:15:00Z",
  "references": [
    {
      "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/releases/tag/v1.62.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-JHJH-776M-4765

Impact

Patches

Workarounds

References

For more information

CVE-2022-31152 (GCVE-0-2022-31152)

PYSEC-2022-262

Tags

Sightings

Nomenclature

Related by attack behaviour