Document Title:
===============
Chamilo LMS IDOR - (messageId) Delete POST Inject Vulnerability 


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1720

Video: https://www.youtube.com/watch?v=3ApPhUIk12Y


Release Date:
=============
2016-02-15


Vulnerability Laboratory ID (VL-ID):
====================================
1720


Common Vulnerability Scoring System:
====================================
6.1


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 Homepage: https://chamilo.org/chamilo-lms/ )


Abstract Advisory Information:
==============================
An Insecure Direct Object Reference vulnerability has been discoverd in the official web-application Product Chamilo LMS.


Vulnerability Disclosure Timeline:
==================================
2016-02-15: Public Disclosure (Vulnerability Laboratory)


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


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


Severity Level:
===============
High


Technical Details & Description:
================================
An insecure direct object references occurd when an application provides direct access to objects based on user-supplied input. 
As a result of this vulnerability attackers can bypass authorization and access resources in the system directly, for deleting 
another users social wall posts Insecure Direct Object References allow attackers to bypass authorization and access resources 
directly by modifying the value of a parameter[Message id] used to directly point to an Message id of social wall post id. 

Vulnerability Method(s):
        [+] GET 

Vulnerable File(s):
        [+] social/profile.php

Vulnerable Parameter(s):
        [+] messageId


Proof of Concept (PoC):
=======================
The security vulnerability can be exploited by remote attackers with low privilege 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.

1. User A goes to User B or Admin soical wall in platform : /profile.php?u=[USER ID] 

2. choose any Posts related to USER B or ADMIN . and figure out the messageId of Post by replaying to it and 
intercept the data to show the messageId parameter. 

3. User A as Remote attacker will use this link filled with messageId in last to delete others posts 
http://SOMESITE/CHAMILOSCRIPTPATH/main/social/profile.php?messageId=28


Security Risk:
==============
The security risk of the object reference web validation vulnerability in the web-application is estimated as high. (CVSS 6.1)


Credits & Authors:
==================
Lawrence Amer - ( http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer )


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