CVE-2022-31152 – matrix-synapse

Package

Manager: pip
Name: matrix-synapse
Vulnerable Version: >=0 <1.62.0rc1

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: 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

EPSS: 0.00693 pctl0.70978

Details

Denial of service due to incorrect application of event authorization rules ### Impact The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.3/rooms/v10/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including v1.61, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. ### Patches Administrators of homeservers with federation enabled are advised to upgrade to v1.62.0 or higher. ### Workarounds * Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`). ### References * https://github.com/matrix-org/synapse/pull/13087 * https://github.com/matrix-org/synapse/pull/13088 ### For more information If you have any questions or comments about this advisory, e-mail us at [security@matrix.org](mailto:security@matrix.org).

Metadata

Created: 2022-08-31T21:25:37Z
Modified: 2024-09-30T20:26:48Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/08/GHSA-jhjh-776m-4765/GHSA-jhjh-776m-4765.json
CWE IDs: ["CWE-703", "CWE-755"]
Alternative ID: GHSA-jhjh-776m-4765
Finding: F140
Auto approve: 1