CVE ID:	CVE-2024-31208
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.
Test IDs:	1.3.6.1.4.1.25623.1.0.886532   1.3.6.1.4.1.25623.1.0.886483   1.3.6.1.4.1.25623.1.0.886823   1.3.6.1.4.1.25623.1.0.886439   1.3.6.1.4.1.25623.1.0.886470   1.3.6.1.4.1.25623.1.0.886786
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2024-31208 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RR53FNHV446CB37TP45GZ6F6HZLZCK3K/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB/ https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a https://github.com/element-hq/synapse/releases/tag/v1.105.1 https://github.com/element-hq/synapse/releases/tag/v1.105.1 https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v