Vulnerability Description
A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker to decrypt end-to-end encrypted messages sent by affected clients.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Matrix | Element | < 1.2.2 |
| Matrix | Matrix-Android-Sdk2 | < 1.2.2 |
Related Weaknesses (CWE)
References
- https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2PatchThird Party Advisory
- https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharingVendor Advisory
- https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2PatchThird Party Advisory
- https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharingVendor Advisory
FAQ
What is CVE-2021-40824?
CVE-2021-40824 is a vulnerability with a CVSS score of 5.9 (MEDIUM). A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an...
How severe is CVE-2021-40824?
CVE-2021-40824 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-40824?
Check the references section above for vendor advisories and patch information. Affected products include: Matrix Element, Matrix Matrix-Android-Sdk2.