CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
10.3%
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 how the auth chain cover index is calculated. 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.
One can:
If you have any questions or comments about this advisory, please email us at security AT element.io.
github.com/advisories/GHSA-3h7q-rfh9-xm4v
github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a
github.com/element-hq/synapse/releases/tag/v1.105.1
github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v
github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2024-50.yaml
lists.fedoraproject.org/archives/list/[email protected]/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB
lists.fedoraproject.org/archives/list/[email protected]/message/RR53FNHV446CB37TP45GZ6F6HZLZCK3K
lists.fedoraproject.org/archives/list/[email protected]/message/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET
nvd.nist.gov/vuln/detail/CVE-2024-31208