CVE-2022-39335
The Matrix Federation API allows remote homeservers to request the authorization events in a room.
Does this matter?
Lower severity and a low EPSS score (0.64%). 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. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.
- CVSS 3.1
- 5.0 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 0.64% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200, CWE-862
- Affected
- matrix/synapse
- Source
- security-advisories@github.com
References
- https://github.com/matrix-org/synapse/issues/13288Issue Tracking
- https://github.com/matrix-org/synapse/pull/13823Patch
- https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwvMitigation, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/
- https://github.com/matrix-org/synapse/issues/13288Issue Tracking
- https://github.com/matrix-org/synapse/pull/13823Patch
- https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwvMitigation, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.