GMX Service Center - Blind SQL Injection Vulnerability

Document Title:
===============
GMX Service Center - Blind SQL Injection Vulnerability



Release Date:
=============
2011-08-16


Vulnerability Laboratory ID (VL-ID):
====================================
150


Product & Service Introduction:
===============================
Das Internet ist Kommunikation - dort ist unser Zuhause. Wir möchten, dass sich auch unsere Kunden 
dort wohlfühlen. Deshalb machen wir den elektronischen Dialog noch einfacher, komfortabler und zuverlässiger. 
Dort gehen wir unseren Weg, der e-mail, Telefon, Mobiltelefon, Fax und andere Kommunikationsmittel 
miteinander verknüpft.

(Copy from the Vendor Homepage: http://www.gmx.net)


Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered a SQL-Injection Vulnerability on the GMX Service Center.


Vulnerability Disclosure Timeline:
==================================
2010-07-06:	Vendor Notification
2010-08-02:	Vendor Response/Feedback
2010-10-03:	Vendor Fix/Patch
2011-07-12:	Public or Non-Public Disclosure


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


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

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


Severity Level:
===============
High


Technical Details & Description:
================================
A blind sql injection vulnerability is detected on the famous gmx service center website.
A remote attacker can inject/execute own sql statements on the affected vulnerable application(dbms).

Vulnerable Module(s):
                                                           [+] Guest DFS - Param


Proof of Concept (PoC):
=======================
The blind sql injection vulnerability can be exploited by remote attackers with a low privileged user account. For demonstration or reproduce ... 

1. Request an account for the service center of gmx.net!
2. After you got a valid session, open up your session with the last request 
3. Open the PoC param & you´ll get a exploitable error
3. The vulnerability is an exploitable blind sql-injection vulnerability

URL: http://service.gmx.net
PATH: /de/cgi/dfs_guest/
Include:	 bTwoIOAGJk5mCCEcqz9ARXO3x1smtB%27%20%20AND%201=%271

Reference:
http://xxx.net/de/cgi/dfs_guest/bTwoIOAGJk5mCCEcqz9ARXO3x1smtB%27%20%20AND%201=%271


Solution - Fix & Patch:
=======================
2011-02-29


Security Risk:
==============
The security risk of the blind sql injection vulnerability is estimated as high.


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


Disclaimer & Information:
=========================
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