CVE-2022-31152

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Summary

CVECVE-2022-31152
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-09-02 20:15:00 UTC
Updated2022-09-09 03:21:00 UTC
DescriptionSynapse 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.

Risk And Classification

Problem Types: CWE-755

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Synapse All All All All

References

ReferenceSourceLinkTags
Fix inconsistencies in event validation for `m.room.create` events by richvdh · Pull Request #13087 · matrix-org/synapse · GitHub MISC github.com
Fix inconsistencies in event validation by richvdh · Pull Request #13088 · matrix-org/synapse · GitHub MISC github.com
Denial of service due to incorrect application of event authorization rules · Advisory · matrix-org/synapse · GitHub CONFIRM github.com
Release v1.62.0 · matrix-org/synapse · GitHub MISC github.com
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