http://bugzilla.opensuse.org/show_bug.cgi?id=1190038 Bug ID: 1190038 Summary: VUL-0: CVE-2021-39164: matrix-synapse: Improper authorisation of /members discloses room membership to non-members Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.2 Hardware: Other URL: https://smash.suse.de/issue/308825/ OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Security Assignee: mrueckert@suse.com Reporter: rfrohl@suse.com QA Contact: security-team@suse.de CC: asarai@suse.com Found By: Security Response Team Blocker: --- rh#1999844 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. https://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3... https://github.com/matrix-org/synapse/releases/tag/v1.41.1 https://github.com/matrix-org/synapse/commit/cb35df940a References: https://bugzilla.redhat.com/show_bug.cgi?id=1999844 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-39164 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39164 https://github.com/matrix-org/synapse/security/advisories/GHSA-3x4c-pq33-4w3... https://github.com/matrix-org/synapse/releases/tag/v1.41.1 https://github.com/matrix-org/synapse/commit/cb35df940a -- You are receiving this mail because: You are on the CC list for the bug.