Macro Expert 4.0 Privilege Escalation

`# Exploit Title: Macro Expert 4.0 Multiple Elevation of Privilege  
# Date: 26/09/2016  
# Exploit Author: Tulpa  
# Contact: [email protected]  
# Author website: www.tulpa-security.com  
# Vendor Homepage: http://www.macro-expert.com/  
# Software Link: http://www.macro-expert.com/download.htm  
# Version: Software Version 4.0  
# Tested on: Windows 7 x86  
# Shout-out to carbonated and ozzie_offsec  
  
1. Description:  
Macro Expert installs as a service with an unquoted service path running with SYSTEM  
  
privileges. This could potentially allow an authorized but non-privileged local  
user to execute arbitrary code with elevated privileges on the system. Additionally the  
  
default installation path suffers from weak folder permission which an unauthorized user  
  
in the BUILTIN\Users group could take advantage of.  
  
2. Proof  
  
C:\Program Files\GrassSoft>sc qc "Macro Expert"  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: Macro Expert  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 1 NORMAL  
BINARY_PATH_NAME : c:\program files\grasssoft\macro expert\MacroService.exe  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : Macro Expert  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
C:\Program Files\GrassSoft>cacls "Macro Expert"  
C:\Program Files\GrassSoft\Macro Expert BUILTIN\Users:(OI)(CI)C  
NT SERVICE\TrustedInstaller:(ID)F  
NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F  
BUILTIN\Administrators:(ID)F  
BUILTIN\Administrators:(OI)(CI)(IO)(ID)F  
BUILTIN\Users:(ID)R  
BUILTIN\Users:(OI)(CI)(IO)(ID)(special access:)  
GENERIC_READ  
  
GENERIC_EXECUTE  
  
CREATOR OWNER:(OI)(CI)(IO)(ID)F  
  
  
3. Exploit:  
  
A successful attempt would require the local user to be able to insert their  
code in the system root path undetected by the OS or other security applications  
where it could potentially be executed during application startup or reboot.  
If successful, the local user's code would execute with the elevated privileges  
of the application.  
  
`