Information disclosure in Matrix Javascript SDK - CVE-2021-40823
Published: September 14, 2021 / Updated: December 16, 2024
Vulnerability identifier: #VU56488
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-40823
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Matrix Javascript SDK
Matrix Javascript SDK
Software vendor:
Matrix.org
Matrix.org
Description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to logic error in the room key sharing functionality in matrix-js-sdk. In certain circumstances it is possible to trick vulnerable clients into disclosing encryption keys for messages previously sent by that client to user accounts later compromised by an attacker.
Remediation
Install updates from vendor's website.