Vulnerabilities > CVE-2021-32659 - Unspecified vulnerability in Matrix Matrix-Appservice-Bridge

CVSS 4.9 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

HIGH

Confidentiality impact

NONE

Integrity impact

HIGH

Availability impact

NONE

network

low complexity

matrix

NVD

Published: 2021-06-16

Updated: 2024-11-21

Summary

Matrix-appservice-bridge is the bridging service for the Matrix communication program's application services. In versions 2.6.0 and earlier, if a bridge has room upgrade handling turned on in the configuration (the `roomUpgradeOpts` key when instantiating a new `Bridge` instance.), any `m.room.tombstone` event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room `m.room.create` event is not checked to verify if the `predecessor` field contains the previous room. This means that any malicious admin of a bridged room can repoint the traffic to a different room without the new room being aware. Versions 2.6.1 and greater are patched. As a workaround, disabling the automatic room upgrade handling can be done by removing the `roomUpgradeOpts` key from the `Bridge` class options.

Vulnerable Configurations

Part	Description	Count
Application	Matrix Matrix Matrix Appservice Bridge - Matrix Matrix Appservice Bridge 0.1.0 Matrix Matrix Appservice Bridge 0.1.1 Matrix Matrix Appservice Bridge 0.1.2 Matrix Matrix Appservice Bridge 0.1.3 Matrix Matrix Appservice Bridge 0.1.4 Matrix Matrix Appservice Bridge 0.1.5 Matrix Matrix Appservice Bridge 0.3.2 Matrix Matrix Appservice Bridge 0.3.3 Matrix Matrix Appservice Bridge 0.3.4 Matrix Matrix Appservice Bridge 0.3.5 Matrix Matrix Appservice Bridge 0.3.6 Matrix Matrix Appservice Bridge 1.0.0 Matrix Matrix Appservice Bridge 1.0.1 Matrix Matrix Appservice Bridge 1.1.1 Matrix Matrix Appservice Bridge 1.2.1 Matrix Matrix Appservice Bridge 1.3.0 Matrix Matrix Appservice Bridge 1.3.3 Matrix Matrix Appservice Bridge 1.3.4 Matrix Matrix Appservice Bridge 1.3.5 Matrix Matrix Appservice Bridge 1.3.6 Matrix Matrix Appservice Bridge 1.4.0 Matrix Matrix Appservice Bridge 1.5.0 Matrix Matrix Appservice Bridge 1.6.0 Matrix Matrix Appservice Bridge 1.6.1 Matrix Matrix Appservice Bridge 1.7.0 Matrix Matrix Appservice Bridge 1.8.1 Matrix Matrix Appservice Bridge 1.9.0 Matrix Matrix Appservice Bridge 1.9.1 Matrix Matrix Appservice Bridge 1.9.2 Matrix Matrix Appservice Bridge 1.10.0 Matrix Matrix Appservice Bridge 1.10.1 Matrix Matrix Appservice Bridge 1.10.2 Matrix Matrix Appservice Bridge 1.10.3 Matrix Matrix Appservice Bridge 1.11.0 Matrix Matrix Appservice Bridge 1.11.1 Matrix Matrix Appservice Bridge 1.12.0 Matrix Matrix Appservice Bridge 1.12.1 Matrix Matrix Appservice Bridge 1.12.2 Matrix Matrix Appservice Bridge 1.13.0 Matrix Matrix Appservice Bridge 1.13.1 Matrix Matrix Appservice Bridge 1.13.2 Matrix Matrix Appservice Bridge 1.14.0 Matrix Matrix Appservice Bridge 2.0.0 Matrix Matrix Appservice Bridge 2.1.0 Matrix Matrix Appservice Bridge 2.2.0 Matrix Matrix Appservice Bridge 2.3.0 Matrix Matrix Appservice Bridge 2.3.1 Matrix Matrix Appservice Bridge 2.4.0 Matrix Matrix Appservice Bridge 2.4.1 Matrix Matrix Appservice Bridge 2.5.0 Matrix Matrix Appservice Bridge 2.6.0	68

Summary

Vulnerable Configurations

References