61 lines
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2.6 KiB
Text
61 lines
No EOL
2.6 KiB
Text
# Exploit Title: Macro Expert 4.0 Multiple Elevation of Privilege
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# Date: 26/09/2016
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# Exploit Author: Tulpa
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# Contact: tulpa@tulpa-security.com
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# Author website: www.tulpa-security.com
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# Vendor Homepage: http://www.macro-expert.com/
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# Software Link: http://www.macro-expert.com/download.htm
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# Version: Software Version 4.0
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# Tested on: Windows 7 x86
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# Shout-out to carbonated and ozzie_offsec
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1. Description:
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Macro Expert installs as a service with an unquoted service path running with SYSTEM
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privileges. This could potentially allow an authorized but non-privileged local
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user to execute arbitrary code with elevated privileges on the system. Additionally the
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default installation path suffers from weak folder permission which an unauthorized user
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in the BUILTIN\Users group could take advantage of.
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2. Proof
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C:\Program Files\GrassSoft>sc qc "Macro Expert"
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[SC] QueryServiceConfig SUCCESS
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SERVICE_NAME: Macro Expert
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TYPE : 10 WIN32_OWN_PROCESS
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START_TYPE : 2 AUTO_START
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ERROR_CONTROL : 1 NORMAL
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BINARY_PATH_NAME : c:\program files\grasssoft\macro expert\MacroService.exe
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LOAD_ORDER_GROUP :
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TAG : 0
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DISPLAY_NAME : Macro Expert
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DEPENDENCIES :
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SERVICE_START_NAME : LocalSystem
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C:\Program Files\GrassSoft>cacls "Macro Expert"
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C:\Program Files\GrassSoft\Macro Expert BUILTIN\Users:(OI)(CI)C
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NT SERVICE\TrustedInstaller:(ID)F
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NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F
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NT AUTHORITY\SYSTEM:(ID)F
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NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F
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BUILTIN\Administrators:(ID)F
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BUILTIN\Administrators:(OI)(CI)(IO)(ID)F
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BUILTIN\Users:(ID)R
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BUILTIN\Users:(OI)(CI)(IO)(ID)(special access:)
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GENERIC_READ
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GENERIC_EXECUTE
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CREATOR OWNER:(OI)(CI)(IO)(ID)F
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3. Exploit:
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A successful attempt would require the local user to be able to insert their
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code in the system root path undetected by the OS or other security applications
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where it could potentially be executed during application startup or reboot.
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If successful, the local user's code would execute with the elevated privileges
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of the application. |