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CVE-2023-43796

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Date: October 31, 2023

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.

Language: Python

Severity Score

Related Resources (8)

https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/
https://security-tracker.debian.org/tracker/CVE-2023-43796
https://nvd.nist.gov/vuln/detail/CVE-2023-43796
https://security.gentoo.org/glsa/202401-12
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/
https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
https://www.mend.io/vulnerability-database/CVE-2023-43796

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Insufficient Information

NVD-CWE-noinfo

Top Fix

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Upgrade Version

Upgrade to version matrix-synapse - 1.95.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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