CVE-2021-39164 – matrix-synapse

Package

Manager: pip
Name: matrix-synapse
Vulnerable Version: >=0 <1.41.1

Severity

Level: Low

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

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00502 pctl0.65029

Details

Improper authorisation of members discloses room membership to non-members ### Impact Unauthorised users can access the membership (list of members, with their display names) of a room if they know the ID of the room. The vulnerability is limited to rooms with `shared` history visibility. Furthermore, the unauthorised user must be using an account on a vulnerable homeserver that is in the room. ### Patches Server administrators should upgrade to 1.41.1 or later. ### Workarounds Administrators of servers that use a reverse proxy could, with potentially unacceptable loss of functionality, block the following endpoints: * `/_matrix/client/r0/rooms/{room_id}/members` with `at` query parameter * `/_matrix/client/unstable/rooms/{room_id}/members` with `at` query parameter ### References n/a ### For more information If you have any questions or comments about this advisory, e-mail us at security@matrix.org.

Metadata

Created: 2021-09-01T18:25:27Z
Modified: 2024-09-24T15:36:22Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/09/GHSA-3x4c-pq33-4w3q/GHSA-3x4c-pq33-4w3q.json
CWE IDs: ["CWE-200"]
Alternative ID: GHSA-3x4c-pq33-4w3q
Finding: F310
Auto approve: 1