VVMessenger v1.0.4170x.x - Denial of Service Vulnerabilities

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


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