KWSPHP CMS v1.6.995 - Persistent Cross Site Scripting Web Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
KWSPHP CMS v1.6.995 - Persistent Cross Site Scripting Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1867


Release Date:
=============
2016-07-01


Vulnerability Laboratory ID (VL-ID):
====================================
1867


Common Vulnerability Scoring System:
====================================
3.5


Product & Service Introduction:
===============================
KwsPHP fully configurable Site. Our links and official banners. KwsPHP is a CMS (Content Management System or content 
management system).
Discover its major assets as of the installation: an installation of ease via an ergonomic interface, simple and 
intuitive. You are guided 
step by step through the installation to find yourself before a true virgin website, ready to be filled according to 
your wishes. To change 
your site and add items Space member KwsPHP offers a full range of functions and topics.

(Copy of the Vendor Homepage:  http://www.kwsphp.org/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an application-side vulnerability in the official KWSPHP 
v1.6.995 content management system.


Vulnerability Disclosure Timeline:
==================================
2016-07-01:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
KwsPHP Ltd
Product: KwsPHP - Content Management System (Web-Application) 1.6.995


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


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


Technical Details & Description:
================================
A persistent cross site scripting web vulnerability has been discoverd in the official KWSPHP v1.6.995 content 
management system.
The security issue allows remote attackers to inject own malicious script codes on the application-side of the affected 
service module.

The vulnerability is located in the `sql_contact_pseudo` parameter of the `index.php` file within the contact module. 
Remote attackers and 
low privileged web-application user accounts are able to inject own malicious script code context as `contact 
pseudonym` value of the 
index.php file POST method request. The injection point is the vulnerable contact formular and the execution occurs in 
the same formular 
context after the submit POST method request is perfomed. Not only the form itself is wrong encoded, the email that is 
get send to the 
contact will be encoded as html which results in a second point of execution. The main issue occurs in the contact 
formular itself.

The security risk of the persistent validation vulnerability is estimated as medium with a cvss (common vulnerability 
scoring system) count of 3.5. 
Exploitation of the persistent input validation web vulnerability requires no privileged web-application user account 
and low or medium user interaction. 
Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent external 
redirects to malicious source and 
persistent manipulation of affected or connected application modules.

Request Method(s):
                                [+] POST

Vulnerable Module(s):
                                [+] Contact Formular

Vulnerable File(s):
                                [+] index.php

Vulnerable Parameter(s):
                                [+] sql_contact_pseudo

Affected Module(s):
                                [+] Contact Formular
                                [+] Email Notify


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

--- PoC Session Logs [POST] ---
Host: http://localhost:8080/
User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:47.0) Gecko/20100101 Firefox/47.0
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, br
Referer: http://localost/index.php?mod=contact
Cookie: PHPSESSID=24dbc6ca1f342ab46690fe39b20ba4b2
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 241 test

[+] Method POST [+] 
sql_contact_pseudo=[SCRIPT CODE INJECTION!]&sql_contact_email=test%40live.fr&sql_contact_objet=d&
texte=%3Cp%3Ec%3C%2Fp%3E&contact_copie=non&code_secu=&xss_retour=.%2Findex.php%3Fmod%3Dcontact&contact_envoyer=+Envoyer+


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable `sql_contact_pseudo` parameter of the 
index.php file.
Restrict the parameter and input field inputs by disallowing the usage of special chars or script code tags.
Encode the vulnerable output location with a secure mechanism and filter the entries. Implement a secure exception to 
prevent further persistent injection attacks.


Security Risk:
==============
The security risk of the persistent input validation web vulnerability in the contact module is estimated as medium. 
(CVSS 3.5)


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


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