GHSA-6g67-q39g-r79q

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GHSA-6g67-q39g-r79q

Summary: matrix-js-sdk vulnerable to invisible eavesdropping in group calls

Details: ### Impact An attacker present in a room where an [MSC3401](https://github.com/matrix-org/matrix-spec-proposals/pull/3401) 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. ### Workarounds Users may hold group calls in private rooms where only the exact users who are expected to participate in the call are present.

References: https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q, https://nvd.nist.gov/vuln/detail/CVE-2023-29529, https://github.com/matrix-org/matrix-spec-proposals/pull/3401, https://github.com/matrix-org/matrix-js-sdk, https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0