Title:
======
C4B XPhone UC Web 4.1.890S R1 - Cross Site Vulnerability

Date:
=====
2012-04-24

References:
===========
http://www.vulnerability-lab.com/get_content.php?id=484

VL-ID:
=====
484

Introduction:
=============
XPhone Unified Communications 2011 ist die leistungsstärkste Telefonie- und Kommunikationslösung von C4B. 
Sie ist leicht zu bedienen und verbessert die Arbeitsabläufe in Unternehmen. Die Lösung integriert sich 
nahtlos in bestehende Anwendungen und nutzt die vorhandene Telefonanlage und IT-Infrastruktur. Dabei 
werden die verschiedensten Kommunikationsmittel wie Telefon, Handy, Fax, Voicemail, SMS und Instant Messaging 
vereint und mit Präsenzinformationen kombiniert. Die Software stellt leistungsfähige Telefonie-Funktionen in 
praktisch allen Anwendungen wie z.B. Microsoft Outlook, Lotus Notes, Warenwirtschaftssystemen (ERP),

Kundendatenbanken (CRM) oder dem Webbrowser zur Verfügung. Die Verknüpfung von Telefonereignissen mit bestimmten 
Aktionen, z.B. Starten von Anwendungen, automatische Erstellung von Briefen oder Faxe u.v.m, verbessert die 
Arbeitsabläufe in Unternehmen spürbar.

(Copy of the Vendor Homepage: http://www.c4b.de )

Abstract:
=========
A Vulnerability Laboratory Researcher discovered a persistent Cross-Site Scripting vulnerability in C4B XPhone UC Web v4.1.890SR1.

Report-Timeline:
================
2012-04-24:	Public or Non-Public Disclosure

Status:
========
Published

Affected Products:
==================
C4B
Product: XPhone UC Web v4.1.890SR1

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

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

Details:
========
A persistent Cross-Site Scripting vulnerability has been detected on C4B XPhone UC Web v4.1.890SR1 and versions below. 
The bug allows an attacker to inject arbitrary script code on the application side (persistent) via for example 
a connected groupware application like Microsoft Outlook or IBM Lotus Notes. The injected script code is 
executed on every client who is searching for details of the manipulated user on the web application. Successful 
exploitation of the vulnerability can therefor lead to session hijacking or stable (persistent) context manipulation.

Vulnerable Module(s):
[+] Work => Home/Work => Company Name (Input)
[+] Contact Phone Listing => Company Name Display Conversation (Output)

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

Proof of Concept:
=================
The vulnerability can be exploited by a remote attacker who is able to change his own Groupware details to inject arbitrary code 
like shown on the screenshots, which results in a persistent context manipulation ...

File: Client.aspx

<div id="XPhoneMCDivSearchDetails" style="display: block;" class="ai2" title="Anwesend (Bis auf Weiteres)" userguid="7c9064ab-d6ce-XXXX-XXXX-XXXXXXXXXXXX">
<strong>Julien Ahrens</strong>
<br>Vulnerability-Lab<br><iframe src="http://www.vulnerability-lab.com/index.php"></iframe>
</div>

<div id="XPhoneMCDivSearchDetails" style="display: block; " class="ai2" title="Anwesend (Bis auf Weiteres)" userguid="7c9064ab-d6ce-XXXX-XXXX-XXXXXXXXXXXX">
<strong>Julien Ahrens</strong><br>
<a href="www.vulnerability-lab.com" onclick="javascript:alert(document.cookie)">Vulnerability-Lab</a>
</div>

Risk:
=====
The security risk of the persistent cross site scripting vulnerability is estimated as medium.

Credits:
========
Vulnerability Research Laboratory - Julien Ahrens (MrTuxracer) [www.inshell.net]

Disclaimer:
===========
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. Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability-
Lab. 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 or its suppliers.

Copyright © 2012 Vulnerability-Lab

-- 
VULNERABILITY RESEARCH LABORATORY TEAM
Website: www.vulnerability-lab.com
Mail: research (at) vulnerability-lab (dot) com [email concealed]