Strato Server ACP - Persistent DOM XSS Vulnerabilities

Document Title:
===============
Strato Server ACP - Persistent DOM XSS Vulnerabilities



Release Date:
=============
2011-08-24


Vulnerability Laboratory ID (VL-ID):
====================================
141


Product & Service Introduction:
===============================
Control Panel of Strato Hosting GmbH for Dedicated Server, V-PowerServer & Game-Server.

(Copy from the Vendor Homepage: http://www.strato.de/)


Strato ist mit etwa einer Million Kunden und über vier Millionen gehosteten Domains hinter United Internet 
der zweitgrößte Anbieter auf dem europäischen Webhosting-Markt. Das Unternehmen beschäftigt insgesamt rund 
500+ Mitarbeiter, darin eingeschlossen die Mitarbeiter der Tochterfirma Cronon AG.

(Copy from the Vendor Homepage: http://de.wikipedia.org/wiki/Strato)



Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered multiple persistent Web Vulnerabilities on the Strato dedicated server customer/admin control panel.


Vulnerability Disclosure Timeline:
==================================
2011-08-14:	Vendor Notification
2011-08-17:	Vendor Response/Feedback
2011-08-19:	Vendor Fix/Patch
2011-08-26:	Public or Non-Public Disclosure


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


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

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


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


Technical Details & Description:
================================
Multiple persistent DOM Cross Site Scripting vulnerabilities are detected on the Strato Control Panel of the dedicated servers. 
Local users can implement malicious persistent script code to manipulate specific requests or content of the affected
vulnerable modules. Also future sections were the output is not adjusted are vulnerable. The bug allows also to hijack customer 
sessions with required user interaction.

Vulnerable Module(s):
								[+] DNS Editor (Domain & Subdomain) - Mailserver (MX-Record) &  Domain IPv4 + IPv6 Input Fields

Affected: 
								[+] Output Display - Exception Handling

Pictures:
								../strato1.png 
								../strato2.png


Proof of Concept (PoC):
=======================
The vulnerabilities can be exploited remote attacker with user inter action or by local customers.
For demonstration or reproduce ...

PoC: 
<strong>Domain/Mailserver '>''<EXECUTES PERSISTENT SCRIPTCODE HERE>': Der Servername enthält ungültige Zeichen.
</strong></td>
            </tr>
<tr>
<td nowrap="nowrap" valign="top" style="padding-left: 8px; padding-right: 8px; width: 200px;">


Solution - Fix & Patch:
=======================
Setup a special char restriction on the input fields & clean up the output or use a own secure error handling.

2011-08-19 11:30 : Vendor Fix/Patch


Security Risk:
==============
The security risk of the persistent dom xss vulnerabilities are estimated as medium.


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


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=========================
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