#VU79748 Information disclosure in Synapse - CVE-2022-39335

Vulnerability identifier: #VU79748

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-39335

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Synapse
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Matrix.org

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the Matrix Federation API. A remote homeservers can request the authorization events in a room

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Synapse: before 1.69.0

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External links
https://github.com/matrix-org/synapse/issues/13288
https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv
https://github.com/matrix-org/synapse/pull/13823
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.