HTTP Method Spoofing
Opencast versions prior to 9.10 allow HTTP method spoofing, allowing to change the assumed HTTP method via URL parameter. This allows attackers to turn HTTP GET requests into PUT requests or an HTTP form to send DELETE requests. This bypasses restrictions otherwise put on these types of requests and aids in cross-site request forgery (CSRF) attacks, which would otherwise not be possible.
Impact
The vulnerability allows attackers to craft links or forms which may change the server state. For example, the following GET request would create a new user:
% curl -i -u admin:opencast \
'https://legacy.opencast.org/admin-ng/users/test.json?_method=PUT&username=test&password=attack'
HTTP/2 200
…If an admin is logged in to legacy.opencast.org and accidentally clicks this link, a user will silently be created.
Patches
This issue is fixed in Opencast 9.10 and 10.0.
Workarounds
You can mitigate the problem by setting the SameSite=Strict attribute for your cookies. If this is a viable option for you depends on your integrations. We strongly recommend updating in any case.
References
For more information
If you have any questions or comments about this advisory:
- Open an issue in our issue tracker
- Email us at security@opencast.org
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Java / Kotlin (Maven) | org.opencastproject:opencast-common | < 9.10 | 9.10 |
Referencias
- https://github.com/opencast/opencast/security/advisories/GHSA-j4mm-7pj3-jf7v
- https://nvd.nist.gov/vuln/detail/CVE-2021-43807
- https://github.com/opencast/opencast/commit/59cb6731067283e54f15462be38b6117d8b9ea8b#diff-9c5fb3d1b7e3b0f54bc5c4182965c4fe1f9023d449017cece3005d3f90e8e4d8
- https://github.com/opencast/opencast/commit/8f8271e1085f6f8e306c689d6a56b0bb8d076444
- https://github.com/opencast/opencast
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-290- Plataforma
- Java / Kotlin (Maven)
- Paquete
org.opencastproject:opencast-common- Publicada
- 14.12.2021
- Actualizado
- 11.10.2026 12:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-j4mm-7pj3-jf7v - CC BY 4.0
Historial de vulnerabilidades: org.opencastproject:opencast-common
Todas las vulnerabilidades publicadas de este paquete (Java / Kotlin (Maven)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 6
- Primera → última
- 12.2021 10.2025
- Sin corrección
- 1
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 2
- Media 3
Divulgaciones por año
- 2021: 3
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 0
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.