In short
- CVE-2023-43796 is a MEDIUM (CVSS 5.3) vulnerability affecting matrix-synapse, synapse (matrix).
- Chance of exploitation in the next 30 days (EPSS): 1.2%, higher than 68.1% of all vulnerabilities.
- Fix: update to 1.95.1 or later.
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.
NVD 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.
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