Uncontrolled Recursion in Synapse - CVE-2022-31052
Published: May 22, 2023
Vulnerability identifier: #VU76405
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2022-31052
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Synapse
Fedora
matrix-synapse
Fedora
matrix-synapse
How to mitigate CVE-2022-31052
Install updates from vendor's website.
Synapse - update to 1.61.1
matrix-synapse - addressed in versions 1.61.1-1.fc35, 1.61.1-1.fc36
matrix-synapse - addressed in versions 1.61.1-1.fc35, 1.61.1-1.fc36
External References
- 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/