Denial of service in Matrix Synapse



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-31052
CWE-ID CWE-674
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Synapse
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor Matrix.org

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Uncontrolled Recursion

EUVDB-ID: #VU76405

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-31052

CWE-ID: CWE-674 - Uncontrolled Recursion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an uncontrolled recursion when handling URL previews. A remote attacker can pass a specially crafted web page to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Synapse: All versions

CPE2.3 External links

https://github.com/matrix-org/synapse/security/advisories/GHSA-22p3-qrh9-cx32
https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url
https://github.com/matrix-org/synapse/commit/fa1308061802ac7b7d20e954ba7372c5ac292333
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



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