Logic error in Matrix SDK for Android

中 5.9CVE-2021-40824 · GHSA-jjmc-4p83-pp26 · 13/09/2021 公開 · 17/06/2026 更新

要点

CVE-2021-40824 は org.matrix.android:matrix-android-sdk2, element (matrix), matrix-android-sdk2 (matrix) に影響する深刻度「中」 (CVSS 5.9) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.66%（全脆弱性の 51.7% より高い）。
対処：1.2.2 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
org.matrix.android:matrix-android-sdk2 Maven	`< 1.2.2`	`1.2.2`
element matrix	`< 1.2.2`	`1.2.2`
matrix-android-sdk2 matrix	`< 1.2.2`	`1.2.2`

概要

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 の説明

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.