[UNIX] JavaScript Insertion in phpBB and Ikonboard Bulletin Boards (IMG, CSS)

From: support@securiteam.com
Date: 10/29/01 

From: support@securiteam.com
To: list@securiteam.com
Subject: [UNIX] JavaScript Insertion in phpBB and Ikonboard Bulletin Boards (IMG, CSS)
Message-Id: <20011029071654.A4DED138BF@mail.der-keiler.de>
Date: Mon, 29 Oct 2001 08:16:54 +0100 (CET)

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  JavaScript Insertion in phpBB and Ikonboard Bulletin Boards (IMG, CSS)
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SUMMARY

 <http://www.phpbb.com/> phpBB is a high powered, fully scalable, and
highly customizable forums package. <http://www.ikonboard.com/> Ikonboard
is a comprehensive web bulletin board system. Both products contain a
Cross Site Scripting vulnerability that allows attackers to insert
JavaScript code (and other HTML code) into existing messages, bypassing
the internal JavaScript/HTML code stripper.

DETAILS

Vulnerable systems:
Ikonboard version 2.1.9 Beta
phpBB Version 1.4.2

Immune systems:
Ikonboard version 3.0 beta 7

When using JavaScript between [img] tags the JavaScript will be executed,
for example:
[img]javasCript:alert('This is the test')[/img]
This will cause a popup with a message saying, "This is the test".
 
Possible solution:
Searching the image URL for the text "javascript:" should solve the
problem.

ADDITIONAL INFORMATION

The information has been provided by <mailto:thatsmej@whizkunde.org>
Thatsmej.

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