CVE-2021-32659
Vulnerability from cvelistv5
Published
2021-06-16 18:45
Modified
2024-08-03 23:25
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9fPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhxMitigation, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9fPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhxMitigation, Third Party Advisory
Impacted products
Vendor Product Version
matrix-org matrix-appservice-bridge Version: < 2.6.1
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}


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