Cross Site Scripting in Moodle < 1.3 Apr 30 2004 08:34PM
Bartek Nowotarski (silence10 wp pl)

Cross Site Scripting in Moodle < 1.3



[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






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";




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.


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