SB2021091407 - Information disclosure in Matrix Javascript SDK
Published: September 14, 2021 Updated: December 16, 2024
Security Bulletin ID
SB2021091407
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: CVE-2021-40823)
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 update from vendor's website.