vulnerability
Ubuntu: USN-7444-1 (CVE-2023-43796): Synapse vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:P/I:N/A:N) | 2023-10-31 | 2025-04-24 | 2025-04-25 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
2023-10-31
Added
2025-04-24
Modified
2025-04-25
Description
Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.
Solution
ubuntu-pro-upgrade-matrix-synapse
References
- CVE-2023-43796
- https://attackerkb.com/topics/CVE-2023-43796
- UBUNTU-USN-7444-1
- URL-https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
- URL-https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
- URL-https://ubuntu.com/security/notices/USN-7444-1
- URL-https://www.cve.org/CVERecord?id=CVE-2023-43796
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