gsd-2022-39335
Vulnerability from gsd
Modified
2023-12-13 01:19
Details
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.
Aliases
Aliases
CVE-2022-39335


To clipboard 

{
  "GSD": {
    "alias": "CVE-2022-39335",
    "id": "GSD-2022-39335"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2022-39335"
      ],
      "details": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.",
      "id": "GSD-2022-39335",
      "modified": "2023-12-13T01:19:21.011632Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2022-39335",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "synapse",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "\u003c 1.69.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "matrix-org"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "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 Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade."
          }
        ]
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5,
            "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:L",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-200",
                "lang": "eng",
                "value": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv"
          },
          {
            "name": "https://github.com/matrix-org/synapse/issues/13288",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/synapse/issues/13288"
          },
          {
            "name": "https://github.com/matrix-org/synapse/pull/13823",
            "refsource": "MISC",
            "url": "https://github.com/matrix-org/synapse/pull/13823"
          },
          {
            "name": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/",
            "refsource": "MISC",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-45cj-f97f-ggwv",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c1.69.0",
          "affected_versions": "All versions before 1.69.0",
          "cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "cwe_ids": [
            "CWE-1035",
            "CWE-200",
            "CWE-937"
          ],
          "date": "2023-06-11",
          "description": "### Impact\n\nThe Matrix Federation API allows remote homeservers to request the *authorisation events* of events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room.\nHowever, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorisation events does not sufficiently check that the requesting server should be able to access them.\n\nAuthorisation events include power level events (the list of user IDs and their power levels at the time) and relevant membership events (including the display name of the sender of that event), as well as events like `m.room.create`, `m.room.third_party_invite` and `m.room.join_rules`. Non-authorisation events are unaffected, so it isn\u0027t possible to e.g. extract message contents this way.\n\nThis issue is only exploitable when a malicious actor knows the ID of a target room and the ID of an event from that room. In most cases, this makes exploitation infeasible. This issue is of negligible consequence for public rooms given that any server can easily join the room in order to be allowed to view authorisation events. Further, deployments in a closed federation where all homeservers are trustworthy are not affected.\n\n\n### Patches\n\nThe issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.\n\n\n### Workarounds\n\nSynapse can be configured with a list of servers that it is allowed to federate with [`federation_domain_allow list`]. If this list is in use and all the servers on the list are trusted not to exploit this issue, then this issue is of no consequence.\n\nThis workaround is not practical for homeservers participating in open federation as interaction with any server not on the list would have to happen indirectly through servers that are, leading to inconsistent delays in message delivery.\n\n`federation_domain_allow list` list\n\n### References\n\nFixed in https://github.com/matrix-org/synapse/pull/13823.\n\n\n### For more information\n\nIf you have any questions or comments about this advisory, e-mail us at security@matrix.org.",
          "fixed_versions": [
            "1.69.0"
          ],
          "identifier": "CVE-2022-39335",
          "identifiers": [
            "CVE-2022-39335",
            "GHSA-45cj-f97f-ggwv"
          ],
          "not_impacted": "All versions starting from 1.69.0",
          "package_slug": "pypi/matrix-synapse",
          "pubdate": "2023-05-26",
          "solution": "Upgrade to version 1.69.0 or above.",
          "title": "Synapse does not apply enough checks to servers requesting auth events of events in a room",
          "urls": [
            "https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv",
            "https://github.com/matrix-org/synapse/issues/13288",
            "https://github.com/matrix-org/synapse/pull/13823",
            "https://github.com/advisories/GHSA-45cj-f97f-ggwv"
          ],
          "uuid": "f8b26e63-d6e5-4f53-b57e-8faf897d8bd8"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.69.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2022-39335"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-200"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/matrix-org/synapse/issues/13288",
              "refsource": "MISC",
              "tags": [
                "Issue Tracking"
              ],
              "url": "https://github.com/matrix-org/synapse/issues/13288"
            },
            {
              "name": "https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv",
              "refsource": "MISC",
              "tags": [
                "Mitigation",
                "Vendor Advisory"
              ],
              "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv"
            },
            {
              "name": "https://github.com/matrix-org/synapse/pull/13823",
              "refsource": "MISC",
              "tags": [
                "Patch"
              ],
              "url": "https://github.com/matrix-org/synapse/pull/13823"
            },
            {
              "name": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/",
              "refsource": "MISC",
              "tags": [],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.0,
            "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:L",
            "version": "3.1"
          },
          "exploitabilityScore": 1.6,
          "impactScore": 3.4
        }
      },
      "lastModifiedDate": "2023-06-11T04:15Z",
      "publishedDate": "2023-05-26T14:15Z"
    }
  }
}


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