CVE-2021-39164
Severity CVSS v4.0:
Pending analysis
Type:
CWE-200
Information Leak / Disclosure
Publication date:
31/08/2021
Last modified:
07/11/2023
Description
Matrix is an ecosystem for open federated Instant Messaging and Voice over IP. In versions 1.41.0 and prior, 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. Server administrators should upgrade to 1.41.1 or later in order to receive the patch. One workaround is available. Administrators of servers that use a reverse proxy could, with potentially unacceptable loss of functionality, block the endpoints: `/_matrix/client/r0/rooms/{room_id}/members` with `at` query parameter, and `/_matrix/client/unstable/rooms/{room_id}/members` with `at` query parameter.
Impact
Base Score 3.x
3.10
Severity 3.x
LOW
Base Score 2.0
3.50
Severity 2.0
LOW
Vulnerable products and versions
CPE | From | Up to |
---|---|---|
cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* | 1.41.1 (excluding) | |
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | ||
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- https://github.com/matrix-org/synapse/commit/cb35df940a
- https://github.com/matrix-org/synapse/releases/tag/v1.41.1
- https://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3q
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN/