[UNIX] Land Down Under (LDU) Cross-Site Scripting Vulnerabilities

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To: list@securiteam.com
Date: 30 May 2004 19:44:08 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Land Down Under (LDU) Cross-Site Scripting Vulnerabilities
------------------------------------------------------------------------

SUMMARY

 <http://ldu.neocrome.net/> LDU is "a PHP/MySQL based website engine". LDU
is prone to cross-site scripting in it's special BBcodes that allow
credential stealing (i.e: cookies, sessions..).

DETAILS

Vulnerable Systems:
 * LDU version 700, before security patch

Immune Systems:
 * LDU version 700, after released patch

When a user adds an image to the forum, the system doesn't check if the
input is something like JavaScript code. Therefore it is possible to do
something like this:
[img]javascr!pt:alert(document.cookie);[/img]

Note: Tags are enclosed in brackets.

Using JavaScript, one can become any user that is using a browser with
JavaScript support, including the admin. Another problem is the ability to
cause any user to automatically logout of the board using the following
script code:
[img]http://www.thesitewithLDU.com/auth.php?m=logout[/img]

Which is an inherent problem in LDU that allows this. Anyone reading a
topic with said image will automatically log out.

Vendor Status:
The vendor has been informed and a security patch was released. It can be
obtained from LDU's website. A direct link:
<http://ldu.neocrome.net/page.php?id=1357>
http://ldu.neocrome.net/page.php?id=1357.

ADDITIONAL INFORMATION

The information has been provided by <mailto:timdegier@home.nl> tim de
gier.

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