Automatic room upgrade handling can be used maliciously to bridge a room non-consentually
Impact
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 mailcious admin of a bridged room can repoint the traffic to a different room without the new room being aware.
Patches
Versions 2.6.1 and greater are patched.
Workarounds
Disabling the automatic room upgrade handling can be done by removing the roomUpgradeOpts key from the Bridge class options.
References
The issue is patched by https://github.com/matrix-org/matrix-appservice-bridge/pull/330
For more information]
If you have any questions or comments about this advisory, email us at security@matrix.org.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | matrix-appservice-bridge | < 2.6.1 | 2.6.1 |
Referencias
- https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-35g4-qx3c-vjhx
- https://nvd.nist.gov/vuln/detail/CVE-2021-32659
- https://github.com/matrix-org/matrix-appservice-bridge/pull/330
- https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fcfd858df33e4631e420da07b9f
- https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N- Debilidad (CWE)
CWE-306- Plataforma
- npm
- Paquete
matrix-appservice-bridge- Publicada
- 21.06.2021
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-35g4-qx3c-vjhx - CC BY 4.0
Historial de vulnerabilidades: matrix-appservice-bridge
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 06.2021 08.2023
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Media 2
Divulgaciones por año
- 2021: 1
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 0
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Automatic room upgrade handling can be used maliciously to bridge a room non-consentually esta entrada
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