Local File Include in Dokeos E-Learning System 1.8.5

Advisory Content :

Digital Security Research Group [DSecRG] Advisory #DSECRG-08-029

Application: Dokeos E-Learning System
Versions Affected: 1.8.5
Vendor URL: http://dokeos.com/
Bug: Local File Include
Exploits: YES
Reported: 01.07.2008
Vendor response: 05.07.2008
Solution: YES
Date of Public Advisory: 17.07.2008
Authors: Digital Security Research Group [DSecRG]
(research [at] dsec [dot] ru)

Description
***********

Dokeos E-Learning System system has local file include vulnerability in
script user_portal.php

Vulnerable GET parameter "include".

Registered user can use this vulnerability.

Code
****
#################################################

if (!empty ($_GET['include']) && !strstr($_GET['include'], '/') &&
strstr($_GET['include'], '.html'))
{
include ('./home/'.$_GET['include']);
$pageIncluded = true;
}
else
..

#################################################

Example:

http://[server]/[installdir]/user_portal.php?include=..\..\..\..\..\..\.
.\..\..\..\..\..\..\boot.ini%00.html

Fix Information

***************

you can fix it following this official information
http://www.dokeos.com/wiki/index.php/Security Or wait a new release

Fixing this issue can be done by replacing line 770 of /user_portal.php
by:

if (!empty ($_GET['include']) &&
preg_match('/^[a-zA-Z0-9_-]*\.html$/',$_GET['include']))

About
*****

Digital Security is leading IT security company in Russia, providing
information security consulting, audit and penetration testing services,
risk analysis and ISMS-related services and certification for ISO/IEC
27001:2005 and PCI DSS standards. Digital Security Research Group focuses
on web application and database security problems with vulnerability
reports, advisories and whitepapers posted regularly on our website.

Contact: research [at] dsec [dot] ru
http://www.dsec.ru (in Russian)

Regards,
Digital Security Research Group [DSecRG]
________________________________________
DIGITAL SECURITY
tel/fax: +7(812)703-1547
tel: +7(812)430-9130
e-mail: research (at) dsec (dot) ru [email concealed]
web: www.dsec.ru

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Local File Include in Dokeos E-Learning System 1.8.5