Vulnerability Description
Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Synapse | < 1.105.1 |
| Fedoraproject | Fedora | 38 |
Related Weaknesses (CWE)
References
- https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc01Patch
- https://github.com/element-hq/synapse/releases/tag/v1.105.1Release Notes
- https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4vVendor Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc01Patch
- https://github.com/element-hq/synapse/releases/tag/v1.105.1Release Notes
- https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4vVendor Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
FAQ
What is CVE-2024-31208?
CVE-2024-31208 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakne...
How severe is CVE-2024-31208?
CVE-2024-31208 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-31208?
Check the references section above for vendor advisories and patch information. Affected products include: Matrix Synapse, Fedoraproject Fedora.