Use of a Broken or Risky Cryptographic Algorithm Affecting element-web package, versions <1.8.4-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.09% (39th percentile)

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  • Snyk IDSNYK-ALPINE320-ELEMENTWEB-7009313
  • published23 May 2024
  • disclosed13 Sept 2021

Introduced: 13 Sep 2021

CVE-2021-40823  (opens in a new tab)
CWE-327  (opens in a new tab)

How to fix?

Upgrade Alpine:3.20 element-web to version 1.8.4-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream element-web package and not the element-web package as distributed by Alpine. See How to fix? for Alpine:3.20 relevant fixed versions and status.

A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 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.

CVSS Scores

version 3.1