CVE-2021-34527 PoC — Windows Print Spooler Remote Code Execution Vulnerability

Title:Windows Print Spooler Remote Code Execution Vulnerability (CVE-2021-34527)
Description:<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p> <p>UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability.</p> <p>In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (<strong>Note</strong>: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ):</p> <ul> <li>HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint</li> <li>NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting)</li> <li>UpdatePromptSettings = 0 (DWORD) or not defined (default setting)</li> </ul> <p><strong>Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design.</strong></p> <p>UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also <a href="https://support.microsoft.com/topic/31b91c02-05bc-4ada-a7ea-183b129578a7">KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates</a>.</p> <p>Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.</p>

A patch for PrintNightmare vulnerability that occurs to print spooler service for Windows machines [CVE-2021-34527]

# Introduction
PrintNightmare-Patcher, a simple tool that resolves the PrintNightmare vulnerability, which occurs to print spooler service for Windows machines [CVE-2021-34527]. In addition, it checks if your system has the relevant security update for it or not. 

# Installation
```
git clone https://github.com/0xirison/PrintNightmare-Patcher.git
```

# Usage
```
python printnightmare-patcher.py
```

# Dependencies
No dependencies required

# Features
- Check if the windows system is vulnerable to PrintNightmare or not.
- Check if the Print Spooler service is running or not, and disable it if running.
- Check if the system has an update for PrintNightmare vulnerability "Hotfix-id: KB5004954", and try it to install it if it is not already installed.
- Changing the registry key 'PointAndPrint' settings as Microsoft suggests.

# Does it require elevated privileges?
Yes, it requires administrative privileges

# References
- Windows Print Spooler Remote Code Execution Vulnerability by [Microsoft](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527)
- Windwos Security Update 'KB5004954' by [Microsoft](https://support.microsoft.com/en-us/topic/july-6-2021-kb5004954-monthly-rollup-out-of-band-8e7742b6-8a42-41ab-86dd-0dd0b36b4139)

# Screenshot
![alt text](https://i.imgur.com/AJpJbz7.png)

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├── [1.0K]  LICENSE
├── [6.2K]  printnightmare-patcher.py
└── [1.3K]  README.md

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