Cross-site scripting vulnerability in Invision Power Board version 3.2.3

[Netsparker Advisories <advisories@xxxxxxxxxxxxxxxxxxxx>]

Information
--------------------
Name :  Cross-site scripting vulnerability in Invision Power Board
version 3.2.3
Software :  Invision Power Board version 3.2.3
Vendor Homepage :  http://www.invisionpower.com
Vulnerability Type :  Cross-site scripting
Severity :  High
Researcher :  Vasil A. xss@xxxxxx
Advisory Reference :  NS-12-005

Description
--------------------
Invision Power Board (abbreviated IPB, IP.Board or IP Board) is an
Internet forum software produced by Invision Power Services, Inc. It
is written in PHP and primarily uses MySQL as a database management
system, although support for other database engines is available.

While Invision Power Board is a commercially sold product, there is a
large modding community and many of these modifications are free. In
addition, many groups offer the download or design of free and paid skins.

Details
--------------------
IP Board is affected by a Cross-site scripting vulnerability in version 3.2.3.
Example PoC url is as follows :
http://example.com/forums/index.php?showforum=53";><script>with(document)alert(cookie)</script>

Additional notes:
1.If a forum contain sub-forums this vulnerability don't exist.

2.Most of boards uses "Friendly Url style",but the attack can be
performed  by using "legacy URL style" in the query,e.g :

http://example.com/forum/index.php?showforum=2";><script>alert(/xss/.source)</script>

instead:

http://example.com/forum/index.php?/forum/2-example/

You can read the full article about Cross-site Scripting vulnerability
from here:

Cross-site Scripting
Solution
--------------------
The vendor issued patch for this vulnerability. Please see the references.

Advisory Timeline
--------------------
10/03/2012 - First contact: Sent the vulnerability details
12/03/2012 - Second contact: Ask for patch
14/03/2012 - Vulnerability Fixed
29/03/2012 - Vulnerability Released

Credits
-------------------
It has been discovered on testing of Netsparker, Web Application
Security Scanner - http://www.mavitunasecurity.com/netsparker/

References
-------------------
MSL Advisory Link:
http://www.mavitunasecurity.com/cross-site-scripting-vulnerability-in-invision-power-board/
Netsparker Advisories: http://www.mavitunasecurity.com/netsparker-advisories/

About Netsparker
--------------------
Netsparker® can find and report security issues such as SQL Injection
and Cross-site Scripting (XSS) in all web applications regardless of
the platform and the technology they are built on. Netsparker's unique
detection and exploitation techniques allows it to be dead accurate in
reporting hence it's the first and the only False Positive Free web
application security scanner.

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