CVE Vulnerability

CVE-2021-40823

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.

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

5.9 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1 Third Party Advisory
https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing Vendor Advisory
Configurations

Configuration 1

cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:*:*:*
Information

Published : 2021-09-13 07:15

Updated : 2021-09-24 05:27

NVD link : CVE-2021-40823

Mitre link : CVE-2021-40823

Products Affected
No products.
CWE
CWE-327