ePortfolio version 1.0 Java Multiple Input Validation Vulnerabilities

Advisory Content :

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ePortfolio version 1.0 Java Multiple Input Validation Vulnerabilities

scip AG Vulnerability ID 2893 (12/22/2006)
http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2893

I. INTRODUCTION

ePortfolio is a e-banking application by TKS Banking Solutions.

More information is available on the vendors web site at the following
URL:

http://www.tksbankingsolutions.com/

II. DESCRIPTION

Stefan Friedli found several web-based vulnerabilities that were
identified in ePortfolio version 1.0 Java and may affect earlier
versions as well.

The application uses heavy amounts of javascript code for operation. As
this is not generally a bad thing, it causes massive problems when it
comes to data validation. As we recognized, the entire validation of
input is realized by client-side javascript which can easily be bypassed
using a Proxy BURPproxy or WebScarab to modify original requests sent
(and validated) by the browser.

We assume this vulnerability to exist in nearly every form offered by
the application. Due to the limited functionality of the account used
for testing, we're not able to definitely confirm or deny this fact.

PoC Code is not being published.

IV. IMPACT

As there is a serious lack of server-side measured to protect the
application from malicious input, an attacker may realize nearly every
attack that relies on lacking input-validation which includes Cross Site
Scripting and Cross-Site Request Forgery (Session Riding) .

V. DETECTION

Detection of web based attacks requires a specialized web proxy and/or
intrusion detection system. Patterns for detection of basic attacks are
available and easy to implement, though they may possibly fail on more
sophisticated attacks.

VI. SOLUTION

Server-side input validation should be provied by the application vendor
as soon as possible.

VII. VENDOR RESPONSE

The problems were recognized and will, according to the vendor, be
adressed with the next release by the end of this week. Further, the
vendor claims to be able to change the faulty behaviour remotely or by
editing a non-specified file for existing customers.

VIII. SOURCES

scip AG - Security Consulting Information Process (german)
http://www.scip.ch

scip AG Vulnerability Database (german)
http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2893

IX. DISCLOSURE TIMELINE

12/22/06 Identification of the vulnerabilities
02/05/07 Notification of the vendor
03/02/07 Vendor Response
03/02/07 Release of public advisory

IX. CREDITS

The vulnerabilities were discovered by Stefan Friedli.

Stefan Friedli, scip AG, Zuerich, Switzerland
stfr-at-scip.ch
http://www.scip.ch

A2. LEGAL NOTICES

Copyright (c) 2007 scip AG, Switzerland.

Permission is granted for the re-distribution of this alert. It may not
be edited in any way without permission of scip AG.

The information in the advisory is believed to be accurate at the time
of publishing based on currently available information. There are no
warranties with regard to this information. Neither the author nor the
publisher accepts any liability for any direct, indirect or
consequential loss or damage from use of or reliance on this advisory.

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ePortfolio version 1.0 Java Multiple Input Validation Vulnerabilities