CVE-2023-43796
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Matrix Synapse
PublishedOct 31, 2023
First seenOct 31, 2023
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- matrix synapse1.95.1 or later
- matrix-synapse1.95.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix synapse | v < 1.95.1 | 1.95.1 |
| fedoraproject fedora | 38, 39 | — |
| matrix-synapsePyPI | v < 1.95.1 | 1.95.1 |
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