{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"low"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2021-39163","title":"Title"},{"category":"description","text":"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`.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2021-39163","url":"https://www.suse.com/security/cve/CVE-2021-39163"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1190037 for CVE-2021-39163","url":"https://bugzilla.suse.com/1190037"}],"title":"SUSE CVE CVE-2021-39163","tracking":{"current_release_date":"2025-03-15T08:43:02Z","generator":{"date":"2023-02-15T03:38:21Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-39163","initial_release_date":"2023-02-15T03:38:21Z","revision_history":[{"date":"2023-02-15T03:38:21Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:14:50Z","number":"3","summary":"Current version"},{"date":"2025-02-15T04:49:32Z","number":"4","summary":"Current version"},{"date":"2025-02-17T05:12:08Z","number":"5","summary":"Current version"},{"date":"2025-03-15T08:43:02Z","number":"6","summary":"Current version"}],"status":"interim","version":"6"}},"product_tree":{"branches":[{"branches":[{"branches":[{"category":"product_name","name":"openSUSE Tumbleweed","product":{"name":"openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed","product_identification_helper":{"cpe":"cpe:/o:opensuse:tumbleweed"}}},{"category":"product_version","name":"matrix-synapse-1.43.0-1.1","product":{"name":"matrix-synapse-1.43.0-1.1","product_id":"matrix-synapse-1.43.0-1.1","product_identification_helper":{"cpe":"cpe:2.3:a:matrix:synapse:1.43.0:*:*:*:*:*:*:*","purl":"pkg:rpm/suse/matrix-synapse@1.43.0-1.1"}}}],"category":"product_family","name":"SUSE Linux Enterprise"}],"category":"vendor","name":"SUSE"}],"relationships":[{"category":"default_component_of","full_product_name":{"name":"matrix-synapse-1.43.0-1.1 as component of openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed:matrix-synapse-1.43.0-1.1"},"product_reference":"matrix-synapse-1.43.0-1.1","relates_to_product_reference":"openSUSE Tumbleweed"}]},"vulnerabilities":[{"cve":"CVE-2021-39163","ids":[{"system_name":"SUSE CVE Page","text":"https://www.suse.com/security/cve/CVE-2021-39163"}],"notes":[{"category":"general","text":"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`.","title":"CVE description"}],"product_status":{"recommended":["openSUSE Tumbleweed:matrix-synapse-1.43.0-1.1"]},"references":[{"category":"external","summary":"CVE-2021-39163","url":"https://www.suse.com/security/cve/CVE-2021-39163"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1190037 for CVE-2021-39163","url":"https://bugzilla.suse.com/1190037"}],"remediations":[{"category":"vendor_fix","details":"To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n","product_ids":["openSUSE Tumbleweed:matrix-synapse-1.43.0-1.1"]}],"scores":[{"cvss_v3":{"baseScore":3.1,"baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"products":["openSUSE Tumbleweed:matrix-synapse-1.43.0-1.1"]}],"threats":[{"category":"impact","date":"2021-08-31T20:02:57Z","details":"low"}],"title":"CVE-2021-39163"}]}