CVE-2022-39246

matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`.
Configurations

Configuration 1 (hide)

cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:android:*:*

History

21 Nov 2024, 07:17

Type Values Removed Values Added
New CVE

Information

Published : 2022-09-28 20:15

Updated : 2024-11-21 07:17


NVD link : CVE-2022-39246

Mitre link : CVE-2022-39246

CVE.ORG link : CVE-2022-39246


JSON object : View

Products Affected

matrix

  • software_development_kit
CWE
CWE-287

Improper Authentication

CWE-322

Key Exchange without Entity Authentication