CVE-2023-43796

MEDIUM EPSS 55.1%
Published Oct 31, 20232y ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Oct 31, 2023 2y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
55.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure

Affected Products 3

VendorProductVersionRange
matrixsynapse* <1.95.1
fedoraprojectfedora38any
fedoraprojectfedora39any

References 5

  • github.com https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
    Patch
  • github.com https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
    Vendor Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/
    Mailing List
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/
    Mailing List
  • security.gentoo.org https://security.gentoo.org/glsa/202401-12

Remediation

  • github.com https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
    Patch