Remote Code Execution Through Image Uploads in BookStack
Impact
A user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process.
This most impacts scenarios where non-trusted users are given permission to upload images in any area of the application.
Patches
The issue was addressed in a series of patches: v0.25.3, v0.25.4 and v0.25.5. Users should upgrade to at least v0.25.5 to avoid this patch but ideally the latest BookStack version as previous versions are un-supported.
Workarounds
Depending on BookStack version, you could use the local_secure image storage option, or use s3 or a similar compatible service.
Preventing direct execution of any php files, apart from the public/index.php file, though web-server configuration would also prevent this.
References
BookStack Beta v0.25.3 BookStack Beta v0.25.4 BookStack Beta v0.25.5
For more information
If you have any questions or comments about this advisory:
- Open an issue in the BookStack GitHub repository.
- Ask on the BookStack Discord chat.
- Follow the BookStack Security advise to contact someone privately.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | ssddanbrown/bookstack | < 0.25.5 | 0.25.5 |
Referencias
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hx
- https://nvd.nist.gov/vuln/detail/CVE-2020-5256
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L- Debilidad (CWE)
CWE-95- Plataforma
- Composer
- Paquete
ssddanbrown/bookstack- Publicada
- 13.03.2020
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-g9rq-x4fj-f5hx - CC BY 4.0
Historial de vulnerabilidades: ssddanbrown/bookstack
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 10
- Primera → última
- 03.2020 07.2024
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 4
- Media 5
- Baja 1
Divulgaciones por año
- 2020: 2
- 2021: 4
- 2022: 3
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 0
-
Remote Code Execution Through Image Uploads in BookStack esta entrada
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