Vulnerability Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Synapse | < 1.74.0 |
Related Weaknesses (CWE)
References
- https://github.com/matrix-org/synapse/issues/14492ExploitIssue Tracking
- https://github.com/matrix-org/synapse/pull/14642Patch
- https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvrMitigationVendor Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://github.com/matrix-org/synapse/issues/14492ExploitIssue Tracking
- https://github.com/matrix-org/synapse/pull/14642Patch
- https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvrMitigationVendor Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]
FAQ
What is CVE-2023-32323?
CVE-2023-32323 is a vulnerability with a CVSS score of 5.0 (MEDIUM). Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable o...
How severe is CVE-2023-32323?
CVE-2023-32323 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-32323?
Check the references section above for vendor advisories and patch information. Affected products include: Matrix Synapse.