Parallels Plesk v9.0.2b - Cross Site Scripting Vulnerability

Document Title:
===============
Parallels Plesk v9.0.2b - Cross Site Scripting Vulnerability



Release Date:
=============
2011-06-12


Vulnerability Laboratory ID (VL-ID):
====================================
153


Product & Service Introduction:
===============================
Parallels Plesk Panel ist das führende Control Panel zur Hosting-Automatisierung auf dem Markt.
Parallels Plesk Panel ist benutzerfreundlich und bietet zahlreiche Login-Rollen für alle Anwender. 
Nutzen Sie es, um Ihr Hosting-Geschäft in kürzester Zeit startklar zu machen.

Beseitigen Sie die Schwierigkeiten bei der Verwaltung von Servern. Parallels Plesk Panel bietet eine leicht 
zu erlernende Oberfläche und behält das einfache Look and Feel bei. Die Navigation im Panel ist einfach 
und erlaubt Ihnen, die mühsamsten Aufgaben schell und effizient zu finden und zu erledigen.

(Copy of the Vendor Homepage http://www.parallels.com/de/products/plesk/)


Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered a Cross-Site-Scripting Vulnerability on Plesk.
A remote attacker or local privileged user account can implement  malicious persistent script code over the update function url/path.


Vulnerability Disclosure Timeline:
==================================
2010-03-02:	Vendor Notification
2010-04-19:	Vendor Response/Feedback
2010-05-02:	Vendor Fix/Patch
2010-06-08:	Public or Non-Public Disclosure


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


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

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


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


Technical Details & Description:
================================
A persistent cross site scripting vulnerability is detected on Plesk 9.0.2b.
The vulnerability allows an remote attacker or local privileged user account to implement persistent malicious script codes.

Vulnerable Module(s):
                                                         Plesk Control Panel Updater

Pictures:      http://img41.imageshack.us/img41/2289/plesk.png


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attacker with user inter-action or by local privileged user accounts on plesk.
For demonstration or reproduce ...

Location: Plesk Control Panel Updater - Benachrichtigungseinstellungen
Example: >\"<script>alert(document.cookie)</script><div style=\"[email protected]


--- Exception Logs ---
Fehler: Unable to set configuration: System.Xml.XmlException: Ein Name darf nicht mit dem Zeichen \'<\', 
hexadezimaler Wert 0x3C, beginnen. Zeile 1, Position 57.
bei System.Xml.XmlTextReaderImpl.Throw(Exception e)
bei System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
bei System.Xml.XmlTextReaderImpl.Throw(Int32 pos, String res, String[] args)
bei System.Xml.XmlTextReaderImpl.ParseAttributes()
bei System.Xml.XmlTextReaderImpl.ParseElement()
bei System.Xml.XmlTextReaderImpl.ParseDocumentContent()
bei System.Xml.XmlTextReaderImpl.Read()
bei System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
bei System.Xml.XmlDocument.Load(XmlReader reader)
bei System.Xml.XmlDocument.LoadXml(String xml)
bei PleskAutoUpdate.App.Main(String[] args)



Solution - Fix & Patch:
=======================
Parse and validate Updater input Fields and the corresponding Parameters. To fix the vulnerability, use htmlspecialchars() as a filter.


Security Risk:
==============
The security risk of the cross site scripting vulnerability is estimated as medium because of the persistent attack vector.


Credits & Authors:
==================
Vulnerability Research Laboratory


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