XING Network Website - Multiple Web Vulnerabilities

Document Title:
===============
XING Network Website - Multiple Web Vulnerabilities


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=87


Release Date:
=============
2011-07-21


Vulnerability Laboratory ID (VL-ID):
====================================
87


Product & Service Introduction:
===============================
XING (named openBC/Open Business Club until 17 November 2006) is a big social software platform for enabling a small-world 
network for professionals. The company claims that it is used by people from over 200 countries. Available languages 
include English, German, Spanish, Portuguese, Italian, French, Dutch, Simplified Chinese, Finnish, Swedish, Korean, 
Japanese, Russian, Polish, Turkish and Hungarian. By displaying how each member is connected to any other member, it 
visualizes the small-world phenomenon.

The platform offers personal profiles, groups, discussion forums, event coordination, and other common social community 
features. Basic membership is free. But many core functions, like searching for people with specific qualifications or 
messaging people to whom one is not already connected, can only be accessed by the premium members. Premium membership 
comes at a monthly fee of 5 € (around 7.50 USD). The platform uses https and has a rigid privacy and no-spam policy. 
Unlike many other networking websites, XING provides its paying members very easy email access to any members.

XING has a special Ambassador program for each city or region around the world with a substantial constituency. The 
Ambassadors hold local events that promote the use of social networking as a business tool, letting members introduce 
business ideas to one and other, and get to know each other on a personal level.
XING competes with the American platform LinkedIn and the European Viadeo for social networking among businesses.
XING also offers the system for closed communities, called Enterprise groups with their own access paths and interface designs. 
The platform serves as the infrastructure for corporate groups, including IBM, McKinsey, Accenture and others.

(Copy of the Vendor Homepage: http://en.wikipedia.org )


Abstract Advisory Information:
==============================
Vulnerability-Lab Team discovered multiple persistent Web Vulnerabilities on the XING Business Network.


Vulnerability Disclosure Timeline:
==================================
2010-09-00:	Vendor Notification
2010-10-00:	Vendor Response/Feedback
2011-01-12:	Vendor Fix/Patch
2011-07-20:	Public or Non-Public Disclosure


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


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

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


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


Technical Details & Description:
================================
Multiple Input Validation Vulnerabilities are detected on Xings Business Plattform. The vulnerabilities allows a remote attackers to 
implement malicous persistent script codes on application-side in the profile & preview websites. Successfully exploitation 
can result in session hijacking or specific content manipulation(persistent) when processing user requests.

Vulnerable Module(s):
			[+] Profile - bis heute
			[+] Profile Configuration
			[+] Profile Berufserfahrung
			[+] Profile - Nicht Kontakte (Public)
			[+] Tag Filter - Suche

Picture(s):
			../Xing1.png
			../Xing2.png
			../Xing3.png
			../Xing4.png
			../Xing5.png


Proof of Concept (PoC):
=======================
The Vulnerabilities can be exploited by remote attackers with low required user inter action.
For demonstration or reproduce ...

Include your own script codes on the vulnerable section input mask for user configuration.
Save the data & switch back to the profile site were tehe effect got demonstrated.

Vulnerable Module(s):
			[+] Profile - bis heute
			[+] Profile Configuration
			[+] Profile Berufserfahrung
			[+] Profile - Nicht Kontakte (Public)
			[+] Tag Filter - Suche


Information: To test or verify the vulnerabilities we included a simple <iframe> (external) or <script>(execution)


Solution - Fix & Patch:
=======================
Restrict the input fields and validate the saved input.
Parse the vulnerable output sections.


Security Risk:
==============
The security risk of the persistent input validation vulnerabilities are estimated as medium+|-high.


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


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-
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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.

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