{ "containers": { "cna": { "affected": [ { "product": "matrix-appservice-bridge", "vendor": "matrix-org", "versions": [ { "status": "affected", "version": "< 2.6.1" } ] } ], "descriptions": [ { "lang": "en", "value": "Matrix-appservice-bridge is the bridging service for the Matrix communication program's application services. In versions 2.6.0 and earlier, if a bridge has room upgrade handling turned on in the configuration (the `roomUpgradeOpts` key when instantiating a new `Bridge` instance.), any `m.room.tombstone` event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room `m.room.create` event is not checked to verify if the `predecessor` field contains the previous room. This means that any malicious admin of a bridged room can repoint the traffic to a different room without the new room being aware. Versions 2.6.1 and greater are patched. As a workaround, disabling the automatic room upgrade handling can be done by removing the `roomUpgradeOpts` key from the `Bridge` class options." } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-306", "description": "CWE-306: Missing Authentication for Critical Function", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2021-06-16T18:45:11.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M" }, "references": [ { "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhx" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9f" }, { "tags": [ "x_refsource_MISC" ], "url": "https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1" } ], "source": { "advisory": "GHSA-35g4-qx3c-vjhx", "discovery": "UNKNOWN" }, "title": "Automatic room upgrade handling can be used maliciously to bridge a room non-consentually", "x_legacyV4Record": { "CVE_data_meta": { "ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-32659", "STATE": "PUBLIC", "TITLE": "Automatic room upgrade handling can be used maliciously to bridge a room non-consentually" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "matrix-appservice-bridge", "version": { "version_data": [ { "version_value": "< 2.6.1" } ] } } ] }, "vendor_name": "matrix-org" } ] } }, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "Matrix-appservice-bridge is the bridging service for the Matrix communication program's application services. In versions 2.6.0 and earlier, if a bridge has room upgrade handling turned on in the configuration (the `roomUpgradeOpts` key when instantiating a new `Bridge` instance.), any `m.room.tombstone` event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room `m.room.create` event is not checked to verify if the `predecessor` field contains the previous room. This means that any malicious admin of a bridged room can repoint the traffic to a different room without the new room being aware. Versions 2.6.1 and greater are patched. As a workaround, disabling the automatic room upgrade handling can be done by removing the `roomUpgradeOpts` key from the `Bridge` class options." } ] }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-306: Missing Authentication for Critical Function" } ] } ] }, "references": { "reference_data": [ { "name": "https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhx", "refsource": "CONFIRM", "url": "https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhx" }, { "name": "https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9f", "refsource": "MISC", "url": "https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9f" }, { "name": "https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1", "refsource": "MISC", "url": "https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1" } ] }, "source": { "advisory": "GHSA-35g4-qx3c-vjhx", "discovery": "UNKNOWN" } } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T23:25:31.074Z" }, "title": "CVE Program Container", "references": [ { "tags": [ "x_refsource_CONFIRM", "x_transferred" ], "url": "https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhx" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9f" }, { "tags": [ "x_refsource_MISC", "x_transferred" ], "url": "https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1" } ] } ] }, "cveMetadata": { "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-32659", "datePublished": "2021-06-16T18:45:11.000Z", "dateReserved": "2021-05-12T00:00:00.000Z", "dateUpdated": "2024-08-03T23:25:31.074Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1" }