> 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/dom/dom-based-open-redirection.md).
# Redirección abierta basada en DOM
Notas de Redirección abierta basada en DOM para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.
### Redirección abierta basada en DOM
Este laboratorio contiene una vulnerabilidad de redirección abierta en el lado del DOM. El objetivo es explotar esta vulnerabilidad para redirigir a la víctima al servidor de explotación.
**Fragmento vulnerable (botón "volver al blog")**/ El código de acción asociado con el botón en la sección de comentarios es:
{% code overflow="wrap" %}
```javascript
onclick='returnUrl = /url=(https?:////.+)/.exec(location); location.href = returnUrl ? returnUrl[1] : "/"'
```
{% endcode %}
Este script extrae un `URL` parámetro de la URL actual usando una expresión regular y redirige a su valor si existe; de lo contrario, vuelve a la raíz (`/`).
**Principio de funcionamiento**/ Simplemente añade `&URL=` a la URL de la publicación. Cuando el usuario hace clic en "volver al blog", el script recupera este parámetro y el navegador es redirigido al destino proporcionado.
**Ejemplos de URL**
{% code overflow="wrap" %}
```
https://0a9700fa04b783118073038f00bc00eb.web-security-academy.net/post?postId=1&url=https://jord4n.pro
```
{% endcode %}
* — tras cargarla, hacer clic en volver al blog redirige a `https://jord4n.pro`.
Para el laboratorio (directamente al servidor de explotación):
{% code overflow="wrap" %}
```
https://0a9700fa04b783118073038f00bc00eb.web-security-academy.net/post?postId=1&url=https://exploit-0abf00fb04aa83b480d502ca019900d1.exploit-server.net/
```
{% endcode %}
---
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