CVE-2021-32659

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Summary

CVECVE-2021-32659
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-16 19:15:00 UTC
Updated2021-07-09 19:46:00 UTC
DescriptionMatrix-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.

Risk And Classification

Problem Types: CWE-306

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Matrix-appservice-bridge All All All All

References

ReferenceSourceLinkTags
Automatic room upgrade handling can be used maliciously to bridge a room non-consentually · Advisory · matrix-org/matrix-appservice-bridge · GitHub CONFIRM github.com
Check m.room.create event on room upgrade · matrix-org/matrix-appservice-bridge@b69e745 · GitHub MISC github.com
Release 2.6.1 (2021-06-02) · matrix-org/matrix-appservice-bridge · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 982090 Nodejs (npm) Security Update for matrix-appservice-bridge (GHSA-35g4-qx3c-vjhx)
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