Title:
======
Subsembly Banking v3.1.x - Persistent Software Vulnerability


Date:
=====
2011-09-13


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=74


VL-ID:
=====
74


Introduction:
=============
Subsembly Banking 3.0 ist Ihre persönliche Finanzverwaltung und Online-Banking-Zentrale zugleich. 
Erledigen Sie Bankgeschäfte einfach und komfortabel. HBCI, FinTS und eine 256 Bit AES Verschlüsselung 
garantieren für Sicherheit. Subsembly Banking 3.0 gibt es für Windows XP und Windows Vista, wobei auch 
die portable Installation auf einem U3 Smart Drive oder anderem USB-Stick möglich ist. Haben Sie einen 
Windows Mobile PDA oder Smartphone? Mit Subsembly Banking Mobile brauchen Sie auch unterwegs nicht auf 
den Komfort von Subsembly Banking verzichten, und das ganz ohne ein schweres Laptop mitzunehmen. Alle 
Subsembly Banking Daten werden bei der nächsten Verbindung mit dem Desktop-PC automatisch synchronisiert. 
So haben Sie jederzeit den aktuellen Datenbestand da, wo Sie ihn gerade brauchen. dem TÜV-Prüfsiegel 
„Geprüfte Software“ ausgezeichnet.

(Copy of the Vendor Homepage: http://subsembly.com/)


Abstract:
=========
Vulnerability-Lab Team discovered a persistent software vulnerabilities on Subsemblys famous online banking software.


Report-Timeline:
================
2011-07-03:  Vendor Notification
2011-**-**:  Vendor Response/Feedback
2011-**-**:  Vendor Fix/Patch
2011-09-12:  Public or Non-Public Disclosure


Status:
========
Published


Affected Products:
==================
SubSembly - Banking Software v3.1.x
SubSembly - Banking Software v3.0


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


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


Details:
========
Multiple persistent input validation vulnerabilities are detected on the Subsembly Banking Software v3.1. 
Attacker can implement own malicious & persistent script codes on a Software main menu. This vulnerability 
allows an attacker to manipulate database files & the bug can result in the modification/manipulation of the 
subsembly banking software.

Vulnerable Module(s):
                                 [+] Wertpapier/Depot - Index Listing

Pictures:
      ../extern.png
      ../trojan.png


Proof of Concept:
=================
The vulnerability can exploited by local or remote attackers. For demonstration or reproduce ...

Password 4 DB: >"<iframe src=http://global-evolution.info width=800 height=800> 
Download PoC in DB:  ../PoC.rar     <= No Mercy


Follow the easy steps to reproduce the bug with db file ...

1. Start software load the database and open it with password
2. Click on overview to see persistent integrated script code

Reproduce manually ...

1. Open the software
2. Set a password for your database
3. Switch over the configuration to "Wertpapier-depot" anlegen.
4. Integrate as name the own script code & execute with a save
5. Switch back to the Index Listing were the script code get executed persistent


Risk:
=====
The security risk of the persistent software vulnerability is estimated as high.


Credits:
========
Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve)


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 © 2011|Vulnerability-Lab




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