Help and Support Center is the default application provided to access online documentation for Microsoft Windows. Microsoft supports accessing help documents directly via URLs by installing a protocol handler for the scheme "hcp". Due to an error in validation of input to hcp:// combined with a local cross site scripting vulnerability and a specialized mechanism to launch the XSS trigger, arbitrary command execution can be achieved. On IE7 on XP SP2 or SP3, code execution is automatic. If WMP9 is installed, it can be used to launch the exploit automatically. If IE8 and WMP11, either can be used to launch the attack, but both pop dialog boxes asking the user if execution should continue. This exploit detects if non-intrusive mechanisms are available and will use one if possible. In the case of both IE8 and WMP11, the exploit defaults to using an iframe on IE8, but is configurable by setting the DIALOGMECH option to "none" or "player".
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