CVE-2021-39164

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Summary

CVECVE-2021-39164
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-31 17:15:00 UTC
Updated2023-11-07 03:37:00 UTC
DescriptionMatrix 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.

Risk And Classification

Problem Types: CWE-200

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 34 All All All
Operating System Fedoraproject Fedora 35 All All All
Application Matrix Synapse All All All All

References

ReferenceSourceLinkTags
Improper authorisation of /members discloses room membership to non-members · Advisory · matrix-org/synapse · GitHub CONFIRM github.com
[SECURITY] Fedora 34 Update: matrix-synapse-1.41.1-1.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
[SECURITY] Fedora 35 Update: matrix-synapse-1.41.1-1.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Merge pull request from GHSA-jj53-8fmw-f2w2 · matrix-org/synapse@cb35df9 · GitHub MISC github.com
Release v1.41.1 · matrix-org/synapse · GitHub MISC github.com
FEDORA-2021-f12fdca1bf FEDORA lists.fedoraproject.org
[SECURITY] Fedora 34 Update: matrix-synapse-1.41.1-1.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 281885 Fedora Security Update for matrix (FEDORA-2021-2e8ed15b14)
  • 501927 Alpine Linux Security Update for synapse
  • 690046 Free Berkeley Software Distribution (FreeBSD) Security Update for py-matrix-synapse (a67e358c-0bf6-11ec-875e-901b0e9408dc)
  • 980489 Python (pip) Security Update for matrix-synapse (GHSA-3x4c-pq33-4w3q)
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