In short
- CVE-2021-40824 is a MEDIUM (CVSS 5.9) vulnerability affecting org.matrix.android:matrix-android-sdk2, element (matrix), matrix-android-sdk2 (matrix).
- Chance of exploitation in the next 30 days (EPSS): 0.66%, higher than 51.7% of all vulnerabilities.
- Fix: update to 1.2.2 or later.
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 leads to a situation where identity verification is inadequate and thus a key-requesting device can be impersonated.
NVD 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.
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