Re: Binary Planting Goes "EXE"

["Stefan Kanthak" <stefan.kanthak () nexgo de>]

"ACROS Security Lists" wrote:

> For everyone interested in binary planting vulnerabilities, here's some new
> information on the EXE vector from our research.
>
> http://blog.acrossecurity.com/2010/09/binary-planting-goes-exe.html

Tell news!

1) There is an equivalent to "SafeDLLSearchPath" for executables: see
   <http://support.microsoft.com/kb/905890>, to be turned on with

   [HKLM\System\CurrentControlSet\Control\Session Manager]
   "SafeProcessSearchMode"=dword:01


2) You missed %HomeDrive%%HomePath% a.k.a. BASE directory: see
   <http://support.microsoft.com/kb/246061>, to be turned off with either

   [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   "StartRunNoHomePath"=dword:01

   or

   [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   "StartRunNoHomePath"=dword:01


3) Planting a rogue executable C:\Program.{exe,com,...} (yes, this needs
   administrative rights in the first place) may still work, even on
   Windows 7 x64: just take a look at

   [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{37efd44d-ef8d-41b1-940d-96973a50e9e0}\Shell\Open\Command]
   @=expand:"%ProgramFiles%\Windows Sidebar\sidebar.exe /showGadgets"

   [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DesktopBackground\Shell\Gadgets\command]
   @="C:\Program Files\Windows Sidebar\sidebar.exe /showGadgets"

   [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NetworkExplorerPlugins\urn:schemas-upnp-org:device:MediaServer:1\shell\Open 
Media
Player\command]
   @=expand:"C:\Program Files\Windows Media Player\wmplayer.exe"

   [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Windows.gadget\shell\open\command]
   @=expand:"%ProgramFiles%\Windows Sidebar\Sidebar.exe"

   [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Media\Windows Media Player\shell\open\command]
   @=expand:"%ProgramFiles(x86)%\Windows Media Player\wmplayer.exe"

   [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\IEXPLORE.EXE\shell\open\command]
   @="C:\Program Files (x86)\Internet Explorer\iexplore.exe"


   Yes, even more than 15 years after introduction of "long" filenames
   some developers still don't know how to properly quote command lines,
   and their QA seems sound asleep!


Stefan Kanthak