Digital Security Research Group [DSecRG] Advisory       #DSECRG-08-030


Application:                    Claroline eLearning and eWorking platform
Versions Affected:              1.8.9
Vendor URL:                     http://www.claroline.net/
Bug:                            Multiple XSS, Phishing Through URL Redirection, Change User Password XSRF Vulnerability
Exploits:                       YES
Reported:                       04.07.2008
Vendor Response:                07.07.2008
Solution:                       YES
Date of Public Advisory:        18.07.2008
Author:                         Digital Security Research Group [DSecRG] (research [at] dsec [dot] ru)



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

Claroline system has multiple security vulnerabilities:

1. Multiple Linked XSS
2. Phishing Through URL Redirection
3. Change User Password XSRF Vulnerability


Details
*******

1. Multiple linked XSS vulnerabilities found. Attacker can inject XSS in URL string

1.1 Linked XSS vulnerabilities found in scripts:

claroline/announcements/announcements.php
claroline/calendar/agenda.php
claroline/course/index.php
claroline/course_description/index.php
claroline/document/document.php
claroline/exercise/exercise.php
claroline/group/group_space.php
claroline/phpbb/newtopic.php
claroline/phpbb/reply.php
claroline/phpbb/viewtopic.php
claroline/wiki/wiki.php
claroline/work/work.php

Attacker can inject XSS in URL string.

Example:

http://[server]/[installdir]/claroline/course/index.php?"><script>alert('DSecRG XSS')</script> 
http://[server]/[installdir]/claroline/phpbb/newtopic.php?"><script>alert('DSecRG XSS')</script>


1.2 Linked XSS vulnerability found in claroline/document/rqmkhtml.php 

GET parameter "cwd"

Example:

http://[server]/[installdir]/claroline/document/rqmkhtml.php?cmd=rqMkHtml&cwd="><script>alert('DSecRG XSS')</script>

---------------------------------------------------------------------


2. Phishing Through URL Redirection

Vulnerability found in script /claroline/redirector.php

GET parameter "url"

Example:

http://[server]/[installdir]/claroline/redirector.php?url=http://evilsite.com

---------------------------------------------------------------------


3. Change User Password XSRF Vulnerability

Previous password not required to set a new password.

Using XSS vulnerabilities, attacker can change user password.


Solution
********

Vendor fix this flaw on 16.07.2008. New version 1.8.10 can be downloaded here:

http://downloads.sourceforge.net/claroline/claroline1810.tar.gz
http://downloads.sourceforge.net/claroline/claroline1810.zip


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)