CVE-2021-39164
CVE-2021-39164 · Improper authorisation of /members discloses room membership to non-members
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 3.1 · Low · EPSS 1.5% · Fix available
- Published
- Updated
Affected products and versions
synapse
- Versions
- < 1.41.1: Affected
No fix published
matrix-synapse PyPI
- Versions
- 0.33.5
- 0.33.5.1
- 0.33.6
- 0.33.6rc1
- 0.33.7
- 0.33.7rc1
- 0.33.7rc2
- 0.33.8
- 0.33.8rc2
- 0.33.9
- 0.34.0
- 0.34.0.1
- 0.34.0rc1
- 0.34.0rc2
- 0.34.1.1
- 0.99.0
- 0.99.0rc1
- 0.99.0rc2
- 0.99.0rc3
- 0.99.0rc4
- 0.99.1
- 0.99.1.1
- 0.99.1rc1
- 0.99.1rc2
- 0.99.2
- 0.99.2rc1
- 0.99.3
- 0.99.3.1
- 0.99.3.2
- 0.99.3rc1
- 0.99.4
- 0.99.4rc1
- 0.99.5
- 0.99.5.1
- 0.99.5.2
- 0.99.5rc1
- 1.0.0
- 1.0.0rc1
- 1.0.0rc2
- 1.0.0rc3
- 1.1.0
- 1.1.0rc1
- 1.1.0rc2
- 1.10.0
- 1.10.0rc1
- 1.10.0rc2
- 1.10.0rc3
- 1.10.0rc5
- 1.10.1
- 1.11.0
- 1.11.0rc1
- 1.11.1
- 1.12.0
- 1.12.0rc1
- 1.12.1
- 1.12.1rc1
- 1.12.2
- 1.12.3
- 1.12.4
- 1.12.4rc1
- 1.13.0
- 1.13.0rc1
- 1.13.0rc2
- 1.13.0rc3
- 1.14.0
- 1.14.0rc1
- 1.14.0rc2
- 1.15.0
- 1.15.0rc1
- 1.15.1
- 1.15.2
- 1.16.0
- 1.16.0rc1
- 1.16.0rc2
- 1.16.1
- 1.17.0
- 1.17.0rc1
- 1.18.0
- 1.18.0rc1
- 1.18.0rc2
- 1.19.0
- 1.19.0rc1
- 1.19.1
- 1.19.1rc1
- 1.19.2
- 1.19.3
- 1.2.0
- 1.2.0rc1
- 1.2.0rc2
- 1.2.1
- 1.20.0
- 1.20.0rc1
- 1.20.0rc2
- 1.20.0rc3
- 1.20.0rc4
- 1.20.0rc5
- 1.20.1
- 1.21.0
- 1.21.0rc1
- 1.21.0rc2
- 1.21.0rc3
- 1.21.1
- 1.21.2
- 1.22.0
- 1.22.0rc1
- 1.22.0rc2
- 1.22.1
- 1.23.0
- 1.23.0rc1
- 1.23.1
- 1.24.0
- 1.24.0rc1
- 1.24.0rc2
- 1.25.0
- 1.25.0rc1
- 1.26.0
- 1.26.0rc1
- 1.26.0rc2
- 1.27.0
- 1.27.0rc1
- 1.27.0rc2
- 1.28.0
- 1.28.0rc1
- 1.29.0
- 1.29.0rc1
- 1.3.0
- 1.3.0rc1
- 1.3.1
- 1.30.0
- 1.30.0rc1
- 1.30.1
- 1.31.0
- 1.31.0rc1
- 1.32.0
- 1.32.0rc1
- 1.32.1
- 1.32.2
- 1.33.0
- 1.33.0rc1
- 1.33.0rc2
- 1.33.1
- 1.33.2
- 1.34.0
- 1.34.0rc1
- 1.35.0
- 1.35.0rc1
- 1.35.0rc2
- 1.35.0rc3
- 1.35.1
- 1.36.0
- 1.36.0rc1
- 1.36.0rc2
- 1.37.0
- 1.37.0rc1
- 1.37.1
- 1.37.1rc1
- 1.38.0
- 1.38.0rc1
- 1.38.0rc2
- 1.38.0rc3
- 1.38.1
- 1.39.0
- 1.39.0rc1
- 1.39.0rc2
- 1.39.0rc3
- 1.4.0
- 1.4.0rc1
- 1.4.0rc2
- 1.4.1
- 1.4.1rc1
- 1.40.0
- 1.40.0rc1
- 1.40.0rc2
- 1.40.0rc3
- 1.41.0
- 1.41.0rc1
- 1.5.0
- 1.5.0rc1
- 1.5.0rc2
- 1.5.1
- 1.6.0
- 1.6.0rc1
- 1.6.0rc2
- 1.6.1
- 1.7.0
- 1.7.0rc1
- 1.7.0rc2
- 1.7.1
- 1.7.2
- 1.7.3
- 1.8.0
- 1.8.0rc1
- 1.9.0
- 1.9.0.dev1
- 1.9.0.dev2
- 1.9.0rc1
- 1.9.1
- Affected ranges
- ECOSYSTEM: < 1.41.1
Update to 1.41.1
matrix-synapse PyPI
- Versions
- 0.33.5
- 0.33.5.1
- 0.33.6
- 0.33.6rc1
- 0.33.7
- 0.33.7rc1
- 0.33.7rc2
- 0.33.8
- 0.33.8rc2
- 0.33.9
- 0.34.0
- 0.34.0.1
- 0.34.0rc1
- 0.34.0rc2
- 0.34.1.1
- 0.99.0
- 0.99.0rc1
- 0.99.0rc2
- 0.99.0rc3
- 0.99.0rc4
- 0.99.1
- 0.99.1.1
- 0.99.1rc1
- 0.99.1rc2
- 0.99.2
- 0.99.2rc1
- 0.99.3
- 0.99.3.1
- 0.99.3.2
- 0.99.3rc1
- 0.99.4
- 0.99.4rc1
- 0.99.5
- 0.99.5.1
- 0.99.5.2
- 0.99.5rc1
- 1.0.0
- 1.0.0rc1
- 1.0.0rc2
- 1.0.0rc3
- 1.1.0
- 1.1.0rc1
- 1.1.0rc2
- 1.10.0
- 1.10.0rc1
- 1.10.0rc2
- 1.10.0rc3
- 1.10.0rc5
- 1.10.1
- 1.11.0
- 1.11.0rc1
- 1.11.1
- 1.12.0
- 1.12.0rc1
- 1.12.1
- 1.12.1rc1
- 1.12.2
- 1.12.3
- 1.12.4
- 1.12.4rc1
- 1.13.0
- 1.13.0rc1
- 1.13.0rc2
- 1.13.0rc3
- 1.14.0
- 1.14.0rc1
- 1.14.0rc2
- 1.15.0
- 1.15.0rc1
- 1.15.1
- 1.15.2
- 1.16.0
- 1.16.0rc1
- 1.16.0rc2
- 1.16.1
- 1.17.0
- 1.17.0rc1
- 1.18.0
- 1.18.0rc1
- 1.18.0rc2
- 1.19.0
- 1.19.0rc1
- 1.19.1
- 1.19.1rc1
- 1.19.2
- 1.19.3
- 1.2.0
- 1.2.0rc1
- 1.2.0rc2
- 1.2.1
- 1.20.0
- 1.20.0rc1
- 1.20.0rc2
- 1.20.0rc3
- 1.20.0rc4
- 1.20.0rc5
- 1.20.1
- 1.21.0
- 1.21.0rc1
- 1.21.0rc2
- 1.21.0rc3
- 1.21.1
- 1.21.2
- 1.22.0
- 1.22.0rc1
- 1.22.0rc2
- 1.22.1
- 1.23.0
- 1.23.0rc1
- 1.23.1
- 1.24.0
- 1.24.0rc1
- 1.24.0rc2
- 1.25.0
- 1.25.0rc1
- 1.26.0
- 1.26.0rc1
- 1.26.0rc2
- 1.27.0
- 1.27.0rc1
- 1.27.0rc2
- 1.28.0
- 1.28.0rc1
- 1.29.0
- 1.29.0rc1
- 1.3.0
- 1.3.0rc1
- 1.3.1
- 1.30.0
- 1.30.0rc1
- 1.30.1
- 1.31.0
- 1.31.0rc1
- 1.32.0
- 1.32.0rc1
- 1.32.1
- 1.32.2
- 1.33.0
- 1.33.0rc1
- 1.33.0rc2
- 1.33.1
- 1.33.2
- 1.34.0
- 1.34.0rc1
- 1.35.0
- 1.35.0rc1
- 1.35.0rc2
- 1.35.0rc3
- 1.35.1
- 1.36.0
- 1.36.0rc1
- 1.36.0rc2
- 1.37.0
- 1.37.0rc1
- 1.37.1
- 1.37.1rc1
- 1.38.0
- 1.38.0rc1
- 1.38.0rc2
- 1.38.0rc3
- 1.38.1
- 1.39.0
- 1.39.0rc1
- 1.39.0rc2
- 1.39.0rc3
- 1.4.0
- 1.4.0rc1
- 1.4.0rc2
- 1.4.1
- 1.4.1rc1
- 1.40.0
- 1.40.0rc1
- 1.40.0rc2
- 1.40.0rc3
- 1.41.0
- 1.41.0rc1
- 1.5.0
- 1.5.0rc1
- 1.5.0rc2
- 1.5.1
- 1.6.0
- 1.6.0rc1
- 1.6.0rc2
- 1.6.1
- 1.7.0
- 1.7.0rc1
- 1.7.0rc2
- 1.7.1
- 1.7.2
- 1.7.3
- 1.8.0
- 1.8.0rc1
- 1.9.0
- 1.9.0.dev1
- 1.9.0.dev2
- 1.9.0rc1
- 1.9.1
- Affected ranges
- GIT: < cb35df940a828bc40b96daed997b5ad4c7842fd3
- ECOSYSTEM: < 1.41.1
Update to 1.41.1
matrix-synapse Ubuntu:Pro:18.04:LTS
- Versions
- 0.19.2+dfsg-6
- 0.24.0+dfsg-1
- 0.24.0+dfsg-1ubuntu0.1~esm1
- 0.24.0+dfsg-1ubuntu0.1~esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
matrix-synapse Ubuntu:Pro:20.04:LTS
- Versions
- 1.3.0-1
- 1.4.0-1
- 1.5.0-1
- 1.5.1-1
- 1.6.0-1
- 1.6.1-1
- 1.7.0-2
- 1.7.1-1
- 1.7.2-1
- 1.7.3-1
- 1.8.0-1
- 1.9.0-1
- 1.9.1-1
- 1.10.0-1
- 1.10.0-2
- 1.11.0-1
- 1.11.0-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
matrix-synapse Ubuntu:Pro:22.04:LTS
- Versions
- 1.39.0-1
- 1.47.0-2
- 1.47.1-1
- 1.48.0-1
- 1.49.0-1
- 1.49.2-1
- 1.50.1-1
- 1.50.2-1
- 1.51.0-1
- 1.52.0-1
- 1.53.0-1
- 1.53.0-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- 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/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF/
- https://nvd.nist.gov/vuln/detail/CVE-2021-39164