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Man-in-the-Middle (MitM) Affecting matrix-js-sdk package, versions <12.4.1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High

    Threat Intelligence

    EPSS 0.08% (32nd percentile)
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NVD
5.9 medium

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  • Snyk ID SNYK-JS-MATRIXJSSDK-1586045
  • published 17 Sep 2021
  • disclosed 17 Sep 2021
  • credit Unknown
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Introduced: 17 Sep 2021

CVE-2021-40823 Open this link in a new tab
CWE-300 Open this link in a new tab

How to fix?

Upgrade matrix-js-sdk to version 12.4.1 or higher.

Overview

matrix-js-sdk is a Matrix Client-Server SDK for Javascript

Affected versions of this package are vulnerable to Man-in-the-Middle (MitM). A logic error in the room key sharing functionality allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.