{"id":"UBUNTU-CVE-2023-29529","details":"matrix-js-sdk is the Matrix Client-Server SDK for JavaScript and TypeScript. An attacker present in a room where an MSC3401 group call is taking place can eavesdrop on the video and audio of participants using matrix-js-sdk, without their knowledge. To affected matrix-js-sdk users, the attacker will not appear to be participating in the call. This attack is possible because matrix-js-sdk's group call implementation accepts incoming direct calls from other users, even if they have not yet declared intent to participate in the group call, as a means of resolving a race condition in call setup. Affected versions do not restrict access to the user's outbound media in this case. Legacy 1:1 calls are unaffected. This is fixed in matrix-js-sdk 24.1.0. As a workaround, users may hold group calls in private rooms where only the exact users who are expected to participate in the call are present.","modified":"2025-10-24T05:01:55Z","published":"2023-04-14T19:15:00Z","upstream":["CVE-2023-29529"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-29529"},{"type":"REPORT","url":"https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q"},{"type":"REPORT","url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3401"},{"type":"REPORT","url":"https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-29529"}],"affected":[{"package":{"name":"node-matrix-js-sdk","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/node-matrix-js-sdk@0.9.2-1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libjs-matrix-js-sdk","binary_version":"0.9.2-1"},{"binary_name":"node-matrix-js-sdk","binary_version":"0.9.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-29529.json"}},{"package":{"name":"node-matrix-js-sdk","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-matrix-js-sdk@9.11.0+~cs9.9.16-1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.3.0+~cs9.9.16-2","9.11.0+~cs9.9.16-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libjs-matrix-js-sdk","binary_version":"9.11.0+~cs9.9.16-1"},{"binary_version":"9.11.0+~cs9.9.16-1","binary_name":"node-matrix-js-sdk"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-29529.json"}},{"package":{"name":"node-matrix-js-sdk","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-matrix-js-sdk@9.11.0+~cs9.9.16-2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.11.0+~cs9.9.16-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libjs-matrix-js-sdk","binary_version":"9.11.0+~cs9.9.16-2"},{"binary_name":"node-matrix-js-sdk","binary_version":"9.11.0+~cs9.9.16-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-29529.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}