Land Down Under Input Validation Hole in BBcodes Lets Remote Users Conduct Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1010335
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SecurityTracker URL: http://securitytracker.com/id?1010335
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: May 29 2004
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Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): LDU 700
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Description: An input validation vulnerability was reported in Land Down Under (LDU) in the processing of BBcodes. A remote user can conduct cross-site scripting attacks.
Tim de gier reported that the software does not filter javascript code from user-supplied BBcodes. A remote user can add a specially
crafted image tag to a message on the forum so that when the message is viewed by a target user, arbitrary scripting code will be
executed by the target user's browser. The code will originate from the site running the LDU software and will run in the security
context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies),
if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on
the site acting as the target user.
A demonstration tag is provided:
[img]javascript:alert(document.cookie);[/img]
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the
LDU software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as
the target user.
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Solution: The vendor has released a fixed version, available at:
http://ldu.neocrome.net/page.php?id=1357
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Vendor URL: ldu.neocrome.net/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: tim de gier <timdegier@home.nl>
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Message History:
None.
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Source Message Contents
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Date: 29 May 2004 14:15:13 -0000
From: tim de gier <timdegier@home.nl>
Subject: LDU (land down under) xss vulnerability
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About Product
=============
LDU is a php/mysql website engine.
Description
===========
A cross site scripting vulnerability exist in the BBcodes of the LDU forum.
When you add a image to your message on the forum, the script doesn't check if it is javascript.
I will give the following proof of concept:
[img]javascript:alert(document.cookie);[/img]
With this vuln, you are able to become any user who uses a browser that "supports" xss (lik
e IE), so it is possible to become admin.
Further there also lies a browser independed problem, cause if you post this message:
[img]http://www.thesitewithLDU.com/auth.php?m=logout[/img]
everyone who reads the topic, will logout.
Solution
========
I e-mailed the LDU developers and the bug was fixed the same day i notified them.
Update to the newest version of LDU 700.
Update link: http://ldu.neocrome.net/page.php?id=1357
Credits
=======
crypt0 of www.cyber-war.org (timdegier@home.nl)
smart-guyz
Greets
======
Cel0x of www.cyber-war.org
Mighty of www.cyber-war.org
Hans Teeuwen (Dutch people will know who i mean :-D)
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