> 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/command-injection/basic-os-command-injection.md).

# Inyección básica de comandos del sistema operativo

### Inyección de comandos del sistema operativo

Este laboratorio presenta una vulnerabilidad de inyección de comandos del sistema en una herramienta de verificación de stock de un producto. / La aplicación ejecuta un comando de shell que incluye las credenciales del producto y de la tienda proporcionadas por el usuario, y luego devuelve directamente el resultado en bruto de este comando en la respuesta.

El objetivo del laboratorio es ejecutar el **whoami** comando para identificar el nombre del usuario actual.

Descubrimos que, en Linux, cuando introduces un comando como:

```bash
pwd
```

es posible encadenar varios comandos usando un punto y coma:

```bash
pwd;whoami
```

<figure><img src="/files/024fcf126305b714afcb2af3a2f71971b302f816" alt="" width="563"><figcaption></figcaption></figure>

En este caso, se transmiten dos parámetros.

<figure><img src="/files/4cd5893e55b90bf9eb5d2b0364e1a11a1be92674" alt="" width="563"><figcaption></figcaption></figure>

Si se inserta un **;** en uno u otro, se puede ejecutar un comando arbitrario porque el backend usa una función del tipo **system**.

Ejemplo:

```bash
productId=1&storeId=1;ls -l
```

<figure><img src="/files/a8e05a158b913c3cd4b4457df8622334f4f5c3ed" alt=""><figcaption></figcaption></figure>


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