Information disclosure in Matrix SDK for Android - CVE-2021-40824
Published: September 14, 2021
Vulnerability identifier: #VU56489
CSH Severity: Medium
CVSS v4: 8.2 [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]
CVE-ID: CVE-2021-40824
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to a logic error in the room key sharing functionality of Element Android in Matrix SDK for Android. 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.
Affected software
Matrix SDK for Android
How to mitigate CVE-2021-40824
Install updates from vendor's website.
Matrix SDK for Android - update to 1.2.2