matrix-org/synapse · Security
Synapse vulnerable to leak of remote user device information
- GHSA ID
- GHSA-mp92-3jfm-3575
- CVE ID
- CVE-2023-43796
- Severity
- medium
- Published
- Updated
- CVSS
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CVSS v3
- 5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Description
Impact
Cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver.
Patches
System administrators are encouraged to upgrade to Synapse 1.95.1 as soon as possible.
Workarounds
The federation_domain_whitelist can be used to limit federation traffic with a homeserver.
CWEs
- CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
References
- https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2023-43796 ↗
- https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f ↗
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-230.yaml ↗
- https://security.gentoo.org/glsa/202401-12 ↗
- https://lists.fedoraproject.org/archives/list/[email protected]/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS ↗
- https://lists.fedoraproject.org/archives/list/[email protected]/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY ↗
- https://github.com/advisories/GHSA-mp92-3jfm-3575 ↗