CVE-2021-39164: Improper authorisation of members discloses room membership to non-members
(updated )
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.
References
- github.com/advisories/GHSA-3x4c-pq33-4w3q
- github.com/matrix-org/synapse
- github.com/matrix-org/synapse/commit/cb35df940a
- github.com/matrix-org/synapse/releases/tag/v1.41.1
- github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3q
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-425.yaml
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2VHDEPCZ22GJFMZCWA2XZAGPOEV72POF
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXT7ID7DNBRN2TVTETU3SYQHJKEG6PXN
- nvd.nist.gov/vuln/detail/CVE-2021-39164
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