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

30 Sep 2022, 17:12

Type Values Removed Values Added
CPE cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:android:*:*
References (CONFIRM) https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3m - (CONFIRM) https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3m - Mitigation, Patch, Third Party Advisory
References (MISC) https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e - (MISC) https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e - Patch, Third Party Advisory
References (MISC) https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1 - (MISC) https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1 - Release Notes, Third Party Advisory
References (MISC) https://github.com/matrix-org/matrix-spec-proposals/pull/3061 - (MISC) https://github.com/matrix-org/matrix-spec-proposals/pull/3061 - Patch, Third Party Advisory
First Time Matrix software Development Kit
Matrix
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 5.3

28 Sep 2022, 20:20

Type Values Removed Values Added
New CVE

Information

Published : 2022-09-28 20:15

Updated : 2023-12-10 14:35


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