CVE-2023-29529 matrix-js-sdk vulnerable to invisible eavesdropping in group calls

2023-04-1418:21:17

CWE-862

GitHub_M

www.cve.org

cve-2023-29529

matrix-js-sdk

eavesdropping

group calls

msc3401

javascript

typescript

video

audio

participants

vulnerability

attacker

room

call setup

workaround

private rooms

security issue

5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

5.3 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

40.3%

JSON

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.

CNA Affected

[
  {
    "vendor": "matrix-org",
    "product": "matrix-js-sdk",
    "versions": [
      {
        "version": "< 24.1.0",
        "status": "affected"
      }
    ]
  }
]