Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2021-40824 |
CWE-ID | CWE-200 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
Matrix SDK for Android Universal components / Libraries / Software for developers |
Vendor | Matrix.org |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU56489
Risk: Medium
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-40824
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMatrix SDK for Android: 0.0.1 - 1.2.1
External linkshttp://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2
http://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.