CVE-2022-39374
If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room.
Does this matter?
Lower severity and a low EPSS score (0.94%). Track it; it rarely justifies an emergency change on its own.
Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.94% probability · 59th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- matrix/synapse
- Source
- security-advisories@github.com
References
- https://github.com/matrix-org/synapse/pull/13723Issue Tracking, Patch
- https://github.com/matrix-org/synapse/security/advisories/GHSA-p9qp-c452-f9r7Mitigation, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/
- https://github.com/matrix-org/synapse/pull/13723Issue Tracking, Patch
- https://github.com/matrix-org/synapse/security/advisories/GHSA-p9qp-c452-f9r7Mitigation, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.