CVE-2024-31208: Synapse's V2 state resolution weakness allows DoS from remote room members
First published: Tue Apr 23 2024(Updated: )
### Impact 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. ### Patches Server administrators should upgrade to 1.105.1 or later. ### Workarounds 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 ### For more information If you have any questions or comments about this advisory, please email us at [security AT element.io](mailto:security@element.io).
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/matrix-synapse | <1.105.1 | 1.105.1 |
| debian/matrix-synapse | 1.121.0-6 |
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Reference Links
- 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/security/advisories/GHSA-3h7q-rfh9-xm4v
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB/
- 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/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET/
- https://nvd.nist.gov/vuln/detail/CVE-2024-31208
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2024-50.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB
- 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/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET
- https://github.com/advisories/GHSA-3h7q-rfh9-xm4v (Advisory)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-31208
- https://launchpad.net/bugs/cve/CVE-2024-31208
- https://security-tracker.debian.org/tracker/CVE-2024-31208
- https://ubuntu.com/security/CVE-2024-31208
Frequently Asked Questions
What is the severity of CVE-2024-31208?
CVE-2024-31208 has a moderate severity as it can lead to high CPU consumption affecting system performance.
How do I fix CVE-2024-31208?
To mitigate CVE-2024-31208, upgrade matrix-synapse to version 1.105.1 or later.
Who is affected by CVE-2024-31208?
CVE-2024-31208 affects Synapse instances running versions prior to 1.105.1.
What type of vulnerability is CVE-2024-31208?
CVE-2024-31208 is a remote code execution vulnerability that can lead to resource exhaustion.
Can CVE-2024-31208 be exploited remotely?
Yes, CVE-2024-31208 can be exploited by remote Matrix users sharing a room with vulnerable Synapse instances.
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