Vulnerability Description
Synapse 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Synapse | < 1.62.0 |
Related Weaknesses (CWE)
References
- https://github.com/matrix-org/synapse/pull/13087Issue TrackingPatchThird Party Advisory
- https://github.com/matrix-org/synapse/pull/13088Issue TrackingPatchThird Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.62.0Release NotesThird Party Advisory
- https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765Issue TrackingMitigationThird Party Advisory
- https://github.com/matrix-org/synapse/pull/13087Issue TrackingPatchThird Party Advisory
- https://github.com/matrix-org/synapse/pull/13088Issue TrackingPatchThird Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.62.0Release NotesThird Party Advisory
- https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765Issue TrackingMitigationThird Party Advisory
FAQ
What is CVE-2022-31152?
CVE-2022-31152 is a vulnerability with a CVSS score of 6.4 (MEDIUM). Synapse 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/r...
How severe is CVE-2022-31152?
CVE-2022-31152 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-31152?
Check the references section above for vendor advisories and patch information. Affected products include: Matrix Synapse.