[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Full-disclosure] Olat CMS 7.8.0.1 - Persistent Calender Web Vulnerability

Document Title:
===============
Olat CMS 7.8.0.1 - Persistent Calender Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1125


Release Date:
=============
2013-10-27


Vulnerability Laboratory ID (VL-ID):
====================================
1125


Common Vulnerability Scoring System:
====================================
4.1


Product & Service Introduction:
===============================
OLAT is an open source Learning Management System offering a flexible online 
course system along with extensive 
features to guarantee learning and teaching independent of time and place. It 
has been created especially for 
public institutions such as universities, academies or colleges, however, it is 
also suitable for other businesses 
since OLAT can easily represent any didactic concept or be used in any kind of 
learning environment.

(Copy of the Vendor Homepage: http://www.olat.org/ )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a persistent input 
validation web vulnerability in the Olat v7.8.0.1 CMS.


Vulnerability Disclosure Timeline:
==================================
2013-10-27:    Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Olat
Product: Content Management System 7.8.0.1 (b20130821 N1)


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
A persistent input validation web vulnerability is detected in the Olat Content 
Management System v7.8.0.1 (b20130821-N1) web-application.
The web vulnerability allows remote attackers to implement/inject own malicious 
script codes on application side of the online-service.

The persistent web vulnerability is located in the `Calender` module. Remote 
attackers are able inject malicious script codes 
via POST method request in the event name (o2cl) parameters of the calender 
service. The script code executes in the main calender 
index. Attacker can also share the calender event by using the public function 
to stream the code to all other users and administrators.

Exploitation of the persistent web vulnerability requires low user interaction 
and a low privileged web-application user account. 
Successful exploitation of the vulnerability can lead to persistent session 
hijacking (customers), account steal via persistent 
web attacks, persistent phishing or persistent module context manipulation.

Request Method(s):
                                [+] [POST]

Vulnerable Module(s):
                                [+] Calender

Vulnerable Parameter(s):
                                [+] event name (o2cl)

Affected Module(s):
                                [+] Calender Index - Event
                                [+] Home Index - Events


Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by remote 
attackers with low privileged application user account and 
only indirect user interaction (page visit). For demonstration or reproduce ...

Manual steps to reproduce ...
1. Install the CMS and login with your low privileged application user account
2. Open the calender, switch to event and add a new one
3. Inject your own malicious test script code to the event name & date input 
fields
4. Click the public event button and save the input to reload the edit site
5. The malicious test context executes in the index module of the calender
6. Click the home button and switch on the right site to the calender events
7. The malicious test code will be visible to all users in the same group or to 
the administrators
8. Successful reproduced ...!


PoC: Event Calender Index

<div id=``o_cal_wv_daylong`` style=``height: 20px;``><div class=``o_cal_wv_time 
o_cal_wv_row0`` style=``height: 100%;``></div>
<div class=``o_cal_wv_dlday o_cal_wv_row1 o_cal_wv_holiday`` style=``height: 
100%;``></div><div class=``o_cal_wv_dlday o_cal_wv_row2`` 
style=``height: 100%;``></div><div class=``o_cal_wv_dlday o_cal_wv_row3`` 
style=``height: 100%;``></div>
<div class=``o_cal_wv_dlday o_cal_wv_row4`` style=``height: 100%;``></div><div 
class=``o_cal_wv_dlday o_cal_wv_row5`` 
style=``height: 100%;``><div class=``o_cal_wv_devent_wrapper``><div 
class=``o_cal_wv_devent o_cal_blue``>
<div class=``o_cal_wv_devent_content``><a 
href=``/olat/auth/1%3A3%3A1002014393%3A5%3A1%3Acmd%3Aedt%3Ap%3Aadmin_en%C2%A7myolat_
1_88496073986542%C2%A71382565600000/`` 
target=``oaa0`` onclick=``return o2cl();``>><[PERSISTENT INJECTED SCRIPT 
CODE!];@gmail.com</a><div class=``o_cal_links``></div></div>
<div class=``o_cal_wv_event_tooltip o_cal_allday``><div 
class=``o_cal_time``>Thursday, October 24, 2013</div>
<div class=``o_cal_wv_event_tooltip_content``>><[PERSISTENT INJECTED SCRIPT 
CODE!]</div>

URL: 
http://olat.localhost:8080/olat/dmz/1%3A2%3A1002010697%3A2%3A0%3Aofo_%3Afid/?o_winrndo=1



PoC: Dashboard - Calender

<div id=``o_c1002040024``><form method=``post`` name=``tb_ms_375920232`` 
action=``/olat/auth/1%3A3%3A1002040024%3A1%3A1/`` 
id=``tb_ms_375920232`` target=``oaa0`` onsubmit=``o_beforeserver();``><div 
class=``b_overflowscrollbox`` 
id=``b_overflowscrollbox_375920232``><table id=``b_table375920232``><tbody><tr 
class=`` b_first_child 
b_last_child``><td class=``b_align_normal b_first_child``><a 
name=``b_table``></a>All day today</td>
<td class=``b_align_normal b_last_child``><a 
href=``/olat/auth/1%3A3%3A1002040024%3A1%3A1%3Ar%3A0%3Ap%3Acmd.launch/`` 
onclick=``return o2cl()`` target=``oaa0``>><[PERSISTENT INJECTED SCRIPT 
CODE!]...</a``></td></tr></tbody></table></div>
<div class=``b_table_buttons``></div><input type=``hidden`` name=``cmd`` 
value=```` /><input type=``hidden`` name=``param`` value=```` /></form></div>
</div></div></div></div></div></div></div>

URL: 
http://olat.localhost:8080/olat/dmz/1%3A2%3A1002010697%3A2%3A0%3Aofo_%3Afid/


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure encode and parse of the events 
calender name parameter.
Parse also the output section in the main home events listing (right bottom) 
and encode the calender index name list.


Security Risk:
==============
The security risk of the persistent post inject web vulnerability is estimated 
as medium(+).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]


Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any 
warranty. Vulnerability Lab disclaims all warranties, 
either expressed or implied, including the warranties of merchantability and 
capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, 
indirect, incidental, consequential loss of business 
profits or special damages, even if Vulnerability-Lab or its suppliers have 
been advised of the possibility of such damages. Some 
states do not allow the exclusion or limitation of liability for consequential 
or incidental damages so the foregoing limitation 
may not apply. We do not approve or encourage anybody to break any vendor 
licenses, policies, deface websites, hack into databases 
or trade with fraud/stolen material.

Domains:    www.vulnerability-lab.com           - www.vuln-lab.com              
               - www.evolution-sec.com
Contact:    admin@xxxxxxxxxxxxxxxxxxxxx         - 
research@xxxxxxxxxxxxxxxxxxxxx               - admin@xxxxxxxxxxxxxxxxx
Section:    www.vulnerability-lab.com/dev       - forum.vulnerability-db.com    
               - magazine.vulnerability-db.com
Social:     twitter.com/#!/vuln_lab             - facebook.com/VulnerabilityLab 
               - youtube.com/user/vulnerability0lab
Feeds:      vulnerability-lab.com/rss/rss.php   - 
vulnerability-lab.com/rss/rss_upcoming.php   - 
vulnerability-lab.com/rss/rss_news.php

Any modified copy or reproduction, including partially usages, of this file 
requires authorization from Vulnerability Laboratory. 
Permission to electronically redistribute this alert in its unmodified form is 
granted. All other rights, including the use of other 
media, are reserved by Vulnerability-Lab Research Team or its suppliers. All 
pictures, texts, advisories, source code, videos and 
other information on this website is trademark of vulnerability-lab team & the 
specific authors or managers. To record, list (feed), 
modify, use or edit our material contact (admin@xxxxxxxxxxxxxxxxxxxxx or 
research@xxxxxxxxxxxxxxxxxxxxx) to get a permission.

                                Copyright © 2013 | Vulnerability Laboratory 
[Evolution Security]



-- 
VULNERABILITY LABORATORY RESEARCH TEAM
DOMAIN: www.vulnerability-lab.com
CONTACT: research@xxxxxxxxxxxxxxxxxxxxx


_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/