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https://github.com/itm4n/PrivescCheck

Privilege Escalation Enumeration Script for Windows
https://github.com/itm4n/PrivescCheck

pentest-tool pentesting privilege-escalation windows windows-privilege-escalation

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Privilege Escalation Enumeration Script for Windows

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README 

        
# PrivescCheck



This script aims to identify __Local Privilege Escalation__ (LPE) vulnerabilities that are usually due to Windows configuration issues, or bad practices. It can also gather useful information for some exploitation and post-exploitation tasks.



## Getting started



After downloading the [script](https://raw.githubusercontent.com/itm4n/PrivescCheck/master/PrivescCheck.ps1) and copying it onto the target Windows machine, run it using one of the commands below.



> [!NOTE]

> You __don't__ need to clone the entire repository. The file `PrivescCheck.ps1` is a standalone PowerShell script that contains all the code required by `PrivescCheck` to run.



> [!IMPORTANT]

> In the commands below, the first `.` (dot) is used for "dot sourcing" the script, so that the functions and cmdlets can be used in the __current scope__ (see PowerShell [dot sourcing feature](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_scripts#script-scope-and-dot-sourcing)).



### Basic checks only



Quickly identify important issues, such as local privilege escalation vulnerabilities.



```bat

powershell -ep bypass -c ". .\PrivescCheck.ps1; Invoke-PrivescCheck"

```



### Extended checks + human-readable reports



Identify important issues, but also gather additional information, and save the results to report files that are easy to read.



```bat

powershell -ep bypass -c ". .\PrivescCheck.ps1; Invoke-PrivescCheck -Extended -Report PrivescCheck_$($env:COMPUTERNAME) -Format TXT,HTML"

```



### All checks + all reports



Perform extended and audit checks, and save the results to human-readable reports, but also machine-readable files, which can later be parsed for automated report generation.



```bat

powershell -ep bypass -c ". .\PrivescCheck.ps1; Invoke-PrivescCheck -Extended -Audit -Report PrivescCheck_$($env:COMPUTERNAME) -Format TXT,HTML,CSV,XML"

```



## Check types



All the checks implemented in PrivescCheck have a __Type__. This value, and the flags specified on the command line, will determine if they are run, or not.



### Base



Checks of type `Base` will always be executed, unless the script is run as an administrator. They are mainly intended for identifying privilege escalation vulnerabilities, or other important issues.



### Extended



Checks of type `Extended` can only be executed if the option `-Extended` is specified on the command line. They are mainly intended for providing additional information that could be useful for exploit development, or post-exploitation.



### Audit



Checks of type `Audit` can only be executed if the option `-Audit` is specified on the command line. They are mainly intended for providing information that is relevant in the context of a configuration audit.



### Experimental



Checks of type `Experimental` can only be executed if the option `-Experimental` is specified on the command line. These are unstable checks that need further work. Use them with caution.



## Tips and tricks



### PowerShell execution policy



By default, the PowerShell [execution policy](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_execution_policies) is set to `Restricted` on clients, and `RemoteSigned` on servers, when a new `powershell.exe` process is started. These policies block the execution of (unsigned) scripts, but they can be overriden within the current scope as follows.



```powershell

Set-ExecutionPolicy Bypass -Scope Process -Force

. .\PrivescCheck.ps1

```



However, this trick does not work when the execution policy is enforced through a GPO. In this case, after starting a new PowerShell session, you can load the script as follows.



```powershell

Get-Content .\PrivescCheck.ps1 | Out-String | Invoke-Expression

```



### PowerShell version 2



A common way to bypass [Constrained Language Mode](https://devblogs.microsoft.com/powershell/powershell-constrained-language-mode/) consists in starting PowerShell __version 2__ as it does not implement this protection. Therefore, a significant part of the development effort goes into maintaining this compatibility.



> [!NOTE]

> Although PowerShell version 2 is still enabled by default on recent versions of Windows, it cannot run without the .Net framework version 2.0, which requires a manual install.



## Known issues



### Metasploit timeout



If you run this script within a Meterpreter session, you will likely get a "timeout" error. Metasploit has a "response timeout" value, which is set to 15 seconds by default, but this script takes a lot more time to run in most environments.



```console

meterpreter > load powershell

Loading extension powershell...Success.

meterpreter > powershell_import /local/path/to/PrivescCheck.ps1

[+] File successfully imported. No result was returned.

meterpreter > powershell_execute "Invoke-PrivescCheck"

[-] Error running command powershell_execute: Rex::TimeoutError Operation timed out.

```



It is possible to set a different value thanks to the `-t` option of the `sessions` command ([documentation](https://www.offensive-security.com/metasploit-unleashed/msfconsole-commands/)). In the following example, a timeout of 2 minutes is set for the session with ID `1`.



```console

msf6 exploit(multi/handler) > sessions -t 120 -i 1

[*] Starting interaction with 1...

meterpreter > powershell_execute "Invoke-PrivescCheck"

```