Macro Expert 4.0 Privilege Escalation
Posted on 27 September 2016
# Exploit Title: Macro Expert 4.0 Multiple Elevation of Privilege # Date: 26/09/2016 # Exploit Author: Tulpa # Contact: tulpa@tulpa-security.com # 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 BUILTINUsers group could take advantage of. 2. Proof C:Program FilesGrassSoft>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 filesgrasssoftmacro expertMacroService.exe LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : Macro Expert DEPENDENCIES : SERVICE_START_NAME : LocalSystem C:Program FilesGrassSoft>cacls "Macro Expert" C:Program FilesGrassSoftMacro Expert BUILTINUsers:(OI)(CI)C NT SERVICETrustedInstaller:(ID)F NT SERVICETrustedInstaller:(CI)(IO)(ID)F NT AUTHORITYSYSTEM:(ID)F NT AUTHORITYSYSTEM:(OI)(CI)(IO)(ID)F BUILTINAdministrators:(ID)F BUILTINAdministrators:(OI)(CI)(IO)(ID)F BUILTINUsers:(ID)R BUILTINUsers:(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.
