> 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/xxe/xxe-file-read-via-external-entities.md).
# Lectura de archivos XXE mediante entidades externas
Notas de Lectura de archivos XXE mediante entidades externas para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.
### Explotando XXE usando entidades externas para recuperar archivos
Explota una vulnerabilidad XXE declarando una entidad externa para recuperar el contenido de un archivo (aquí `/etc/passwd`) desde el **Consultar stock** funcionalidad que analiza XML y devuelve valores inesperados.
La funcionalidad envía XML así:
{% code overflow="wrap" %}
```xml
2
1
```
{% endcode %}
Si el valor numérico de `` se reemplaza por una cadena, este valor se refleja en la respuesta (útil para la operación):
```xml
test
```
1. Declara una entidad externa en una declaración DOCTYPE que apunte al archivo del sistema.
```xml
]>
```
2. Llama a esta entidad en el `` campo que devuelve la aplicación.
```
&myFile;
```
3. La respuesta debería entonces contener el contenido del archivo de destino (`/etc/passwd`).
```xml
]>
&myFile;
1
```
---
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