CVE-2021-40824
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Matrix Element
PublishedSep 13, 2021
First seenSep 13, 2021
How to fix
Update
- matrix element1.2.2 or later
- matrix matrix-android-sdk21.2.2 or later
- org.matrix.android:matrix-android-sdk21.2.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix element | v < 1.2.2 | 1.2.2 |
| matrix matrix-android-sdk2 | v < 1.2.2 | 1.2.2 |
| org.matrix.android:matrix-android-sdk2Maven | v < 1.2.2 | 1.2.2 |
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