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[FD] eFront Learning 3.6.15.6 CMS - (Forum) Persistent Title Web Vulnerability

Document Title:
===============
eFront Learning 3.6.15.6 CMS - (Forum) Persistent Title Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1761


Release Date:
=============
2016-02-23


Vulnerability Laboratory ID (VL-ID):
====================================
1761


Common Vulnerability Scoring System:
====================================
3.7


Product & Service Introduction:
===============================
eFrontPro is a powerful learning management system that provides effective 
employee training that fits your brand preferences for both, 
online training & blended learning.     eFrontPro can help you improve employee 
learning & development, ensure compliance, track employee 
training, engage your workforce and support organizational goals. Trusted by 
hundreds of companies and organizations around the world, 
eFrontPro is committed to assist you train people.

(Copy of the Homepage: http://www.efrontlearning.net/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an 
application-side input validation vulnerability in the eFront Learning 
v3.6.15.6 CMS.


Vulnerability Disclosure Timeline:
==================================
2016-02-23: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Epignosis LLC
Product: eFront eLearning - (Web-Application) 3.6.15.6


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


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


Technical Details & Description:
================================
A persistent Cross site scripting vulnerability has been discovered in the 
official eFront Learning v3.6.15.6 Content Management System.
The security vulnerability allows remote attackers to inject own script code to 
the application-side of the affected application module.

The vulnerability is Located in forum `topics` add POST method request. Remote 
attackers with low privileged web-application user accounts 
are able to inject own malicious script code via POST method request to the 
application-side. The injection point of Vulnerable `topic title` 
parameter in forums on `add topic`. The request method to inject is POST and 
the vulnerability is located to the application-side of the 
vulnerable module. The attacker can inject in the forum topic title own 
malicious script codes to compromise the web-application or dbms.

The security risk of the application-side input web vulnerability is estimated 
as medium with a cvss (common vulnerability scoring system) count of 3.7. 
Exploitation of the persistent web vulnerability requires a low privileged 
web-application account with restricted access and low user interaction. 
Successful exploitation of the vulnerabilities results in persistent phishing 
mails, session hijacking, persistent external redirect to malicious 
sources and application-side manipulation of affected or connected module 
context.

Request Method(s):
                                [+] POST

Vulnerable Module(s):
                                [+] Forum (?ctg=forum)

Vulnerable File(s):
                                [+] ./student.php?ctg=forum

Vulnerable Parameter(s):
                                [+] topic - title


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers with low privileged 
web-application user account and low user interaction.
For security demonstration or to reproduce the web vulnerability follow the 
provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. First the user goes to efront forums software
2. Add new topic to the forums 
3. Inject a script code payload to the application side via [add topic title]
4. Save the entry
5. Watch the forum section were the execution of the payload occurs finally
6. Successful reproduce of the vulnerability! 


--- PoC Session Logs [POST  ---
POST /efront/www/student.php?ctg=forum&add=1&type=topic&forum_id=9 HTTP/1.1
Host: efront.com
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:22.0) Gecko/20100101 Firefox/22.0 
Iceweasel/22.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
ctg=forum&add=1&type=topic&forum_id=9&popup=1
Cookie: PHPSESSID=6ba3cf5969fed618bf9ddddde733bf49f4b6; display_all_courses=1; 
setFormRowsHidden=0; 
__test=7ef6241c5ea1b95509d7282ebc902375; 
32fc09efd1cba05e1fbbfed2afbc49be=fb1455ec6287a589ef46sdsd5ed9505885db; 
base_language_id=1; Elgg=7a611e893fc08c3a062deb6f65f1afb4; 
PHPSESSID=6ba3cf59sdsd69fed618bf9de733bf49f4b6; 
parent_sid=6ba3cf5969fed618bf9dsdddddsee733bf49f4b6
Connection: keep-alive
Content-Type: multipart/form-data; 
boundary=—————————————-213209647576881304973562027
Content-Length: 1979
213209647576881304973562027
Content-Disposition: form-data; name=“popup”
1
-—————————————213209647576881304973562027
Content-Disposition: form-data; name=“_qf__topic_add_form”
213209647576881304973562027
Content-Disposition: form-data; name=“MAX_FILE_SIZE”
10485760
-—————————————213209647576881304973562027
Content-Disposition: form-data; name=“qfS_csrf”
39a73c724ca95ea621be2a260a911e87
-—————————————213209647576881304973562027
Content-Disposition: form-data; name=“qfS_csrf”
39a73c724ca95ea621be2a260a911e87
-—————————————213209647576881304973562027
Content-Disposition: form-data; name=“title”
[PERSISTENT INJECTED SCRIPT CODE!]
-—————————————213209647576881304973562027
Content-Disposition: form-data; name=“message”
<p>here is the tesxt</p>
213209647576881304973562027
Content-Disposition: form-data; name=“attachment_upload0”; filename=""
Content-Type: application/octet-stream
213209647576881304973562027
Content-Disposition: form-data; name=“attachment_upload1”; filename=""
Content-Type: application/octet-stream
213209647576881304973562027
Content-Disposition: form-data; name=“attachment_upload2”; filename=""
Content-Type: application/octet-stream
213209647576881304973562027
Content-Disposition: form-data; name=“attachment_upload3”; filename=""
Content-Type: application/octet-stream
213209647576881304973562027
Content-Disposition: form-data; name=“attachment_upload4”; filename=""
Content-Type: application/octet-stream
213209647576881304973562027
Content-Disposition: form-data; name=“submit_add_topic”
Submit
-—————————————213209647576881304973562027—


Reference(s):
http://localhost:8080/SCRIPT/www/student.php?ctg=forum


Solution - Fix & Patch:
=======================
the vulnerability can be patched by a secure parse and encode of vulnerable 
parameters 
[add topic title ] input fields .Restrict the input and disallow usage of 
special chars.
Filter and setup a secure exception handling that prevents the persistent 
execution in the output location.


Security Risk:
==============
The security risk of application-side cross site scripting web vulnerability in 
web application is estimated as medium. (CVSS 3.7)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Lawrence Amer - 
http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer


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