Vulnerability identifier: #VU79748

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

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:

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

---

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

---

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.