XT:Commerce < 3.04 SP2.1 - Cross-Site Scripting

#----------------------------------------------------------------------------------
# Cross-Site-Scripting XT:Commerce < 3.04 SP2.1
#----------------------------------------------------------------------------------
# Affected Software .: XT:Commerce < 3.04 SP2.1
# Venedor ...........: http://www.xt-commerce.de
# Class .............: XSS
# Author ............: Philipp Niedziela
# Original advisory .: http://pn-it.com/blog/wp-content/uploads/2010/11/ad01.txt
# Contact ...........: pn[-at-]pn-it.com
# Date ..............: 2010-11-11
# Tested on: ........: Ubuntu 10.04 / Apache

XT:Commerce is prone to a (permanent) XSS.

PoC:
An attacker needs to create an account, inject javascript into field "street"
(e.g. "><script>alert(document.cookie)</script>) and place an order.
When the administrator opens the order in the backend of the shop, the
javascript will be executed.
By getting the cookie of the admin, the attacker gets the session-id
and user-id. If binding session and ip is _not_ enabled, the attacker will
be able to take over the admin-session.


Solution:
Enable binding session to IP in the backend of your shop