Document Title:
===============
VVMessenger v1.0.4170x.x - Denial of Service Vulnerabilities



Release Date:
=============
2011-08-03


Vulnerability Laboratory ID (VL-ID):
====================================
120


Product & Service Introduction:
===============================
V&V messenger is an instant messaging application for Windows, which connects to the free, open Jabber  IM network (also known as XMPP).
With its help you can easily communicate huge networks of friends, co-workers and business partners, including GTalk and Live Journal users.
Main features:

    * Instant messaging through any jabber server.
    * File transfer: direct or through proxy.
    * Easy screenshots that could be sent directly from chat.
    * Handy customizable user interface.
    * Spell checking.
    * “Message read” notifications.
    * Conference service support.
    * Conference bookmarks.
    * Full user profile and activity information.
    * Search users on server.
    * Constant support and automatic updates. 

(Copy of the Vendor Homepage: http://www.altertech.net/products/vv-messenger)


Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered multiple Denial of Service vulnerabilities on VVMessenger v1.0.4170.


Vulnerability Disclosure Timeline:
==================================
2011-08-04:	Public or Non-Public Disclosure


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


Affected Product(s):
====================

Exploitation Technique:
=======================
Local


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


Technical Details & Description:
================================
Local attackers can crash the running client(software) via different filter lags on 2 vulnerable software modules. 
The execution of code is not possible but crashing results in different unhandled & critical exceptions.


Vulnerable Section(s): 
		                                	[+] History (near s_message_history)
		                                 	[+] JID

Vulnerable Module(s): 
                                 			[+] Callback


Proof of Concept (PoC):
=======================
The denial of service vulnerabilities can be exploited by local attackers. For demonstration or reproduce ...

1. Switch to the vulnerable "Callback" module of the vulnerable sections.
2. Use the input form of the module to penetrate the software with different  strings (zero,long,null) 
3. Save the data to 
4. Reproduce! The result is a stable software crash (DoS)

Pictures:
			../1.png
			../2.png
			../3.png


Security Risk:
==============
The security risk of the stable denial of service vulnerabilities are estimated as medium.


Credits & Authors:
==================
Vulnerability Research Laboratory


Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, 
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business 
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some 
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation 
may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases 
or trade with fraud/stolen material.

Domains:    www.vulnerability-lab.com   	- www.vuln-lab.com			       - www.vulnerability-lab.com/register
Contact:    admin@vulnerability-lab.com 	- support@vulnerability-lab.com 	       - research@vulnerability-lab.com
Section:    video.vulnerability-lab.com 	- forum.vulnerability-lab.com 		       - news.vulnerability-lab.com
Social:	    twitter.com/#!/vuln_lab 		- facebook.com/VulnerabilityLab 	       - youtube.com/user/vulnerability0lab
Feeds:	    vulnerability-lab.com/rss/rss.php	- vulnerability-lab.com/rss/rss_upcoming.php   - vulnerability-lab.com/rss/rss_news.php

Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. 
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other 
media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, sourcecode, videos and 
other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), 
modify, use or edit our material contact (admin@vulnerability-lab.com or support@vulnerability-lab.com) to get a permission.

    				   	Copyright © 2012 | Vulnerability Laboratory