Information Exposure Affecting synapse package, versions <1.41.1-r0


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.08% (36th percentile)

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  • Snyk IDSNYK-ALPINE321-SYNAPSE-8489579
  • published6 Dec 2024
  • disclosed31 Aug 2021

Introduced: 31 Aug 2021

CVE-2021-39164  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Alpine:3.21 synapse to version 1.41.1-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream synapse package and not the synapse package as distributed by Alpine. See How to fix? for Alpine:3.21 relevant fixed versions and status.

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.

CVSS Scores

version 3.1