http://bugzilla.opensuse.org/show_bug.cgi?id=1190037 Bug ID: 1190037 Summary: VUL-0: CVE-2021-39163: matrix-synapse: Adding a private/unlisted room to a community exposes room metadata in an unauthorised manner Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.2 Hardware: Other URL: https://smash.suse.de/issue/308826/ 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#1999846 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 name, avatar, topic and number of members of a room if they know the ID of the room. This vulnerability is limited to homeservers where the vulnerable homeserver is in the room and untrusted users are permitted to create groups (communities). By default, only homeserver administrators can create groups. However, homeserver administrators can already access this information in the database or using the admin API. As a result, only homeservers where the configuration setting `enable_group_creation` has been set to `true` are impacted. Server administrators should upgrade to 1.41.1 or higher to patch the vulnerability. There are two potential workarounds. Server administrators can set `enable_group_creation` to `false` in their homeserver configuration (this is the default value) to prevent creation of groups by non-administrators. Administrators that are using a reverse proxy could, with partial loss of group functionality, block the endpoints `/_matrix/client/r0/groups/{group_id}/rooms` and `/_matrix/client/unstable/groups/{group_id}/rooms`. https://github.com/matrix-org/synapse/security/advisories/GHSA-jj53-8fmw-f2w... 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=1999846 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-39163 https://github.com/matrix-org/synapse/security/advisories/GHSA-jj53-8fmw-f2w... http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39163 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.