'[FD] Wordpress Newsletter Supsystic 1.1.7 - Cross Site Scripting Vulnerability'

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List:       full-disclosure
Subject:    [FD] Wordpress Newsletter Supsystic 1.1.7 - Cross Site Scripting Vulnerability
From:       Vulnerability Lab <research () vulnerability-lab ! com>
Date:       2017-05-23 8:19:19
Message-ID: 51f2c81f-08d3-4294-c925-a95a9496ea80 () vulnerability-lab ! com
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Document Title:
===============
Wordpress Newsletter Supsystic 1.1.7 - Cross Site Scripting Vulnerability

References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2070

Release Date:
=============
2017-05-16

Vulnerability Laboratory ID (VL-ID):
====================================
2070

Common Vulnerability Scoring System:
====================================
3.2

Vulnerability Class:
====================
Cross Site Scripting - Non Persistent

Product & Service Introduction:
===============================
Newsletter by Supsystic out of box plugin for mail list building, newsletter creation, send and \
track email campaigns. Drag-and-drop newsletter template builder delights. Build-in mass mail \
sending and integration with mail services like  MailChimp, Aweber, etc. Unlimited subscribers \
and mails for free.

(Copy of the Vendors Wordpress Plugin Page: \
https://de.wordpress.org/plugins/newsletter-by-supsystic/ )

Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a cross site scripting \
vulnerability in the official  Newsletter Plugin by Supsystic for Wordpress.

Vulnerability Disclosure Timeline:
==================================
2015-05-16: Public Disclosure (Vulnerability Laboratory)

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

Affected Product(s):
====================
Supsystic
Product: Newsletter by Supsystic - Wordpress Plugin (Web-Application) 1.1.7

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

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

Technical Details & Description:
================================
A stored cross site scripting web vulnerability has been discovered in the official Wordpress \
Newsletter Plugin by Supsystic v1.1.7. The persistent vulnerability allows remote attackers to \
inject own malicious script code to the application-side of the module or function.

The stored cross site vulnerability is located in the `s` parameter of the `page` module GET \
method request. Remote attackers are able to  inject own malicious script codes to the \
application-side of the online service web-application to compromise user session information \
or  to permanently manipulate data.

The security risk of the cross site web vulnerability is estimated as medium with a cvss \
(common vulnerability scoring system) count of 3.2. Exploitation of the cross site scripting \
web vulnerability requires no privileged web-application user account and low user interaction. \
 Successful exploitation results in session hijacking, persistent phishings attacks, persistent \
external redirect and malware loads or persistent  manipulation of affected and connected \
module context.

Request Method(s):
[+] GET

Vulnerable Service(s):
[+] Contentive Theme (Wordpress)

Vulnerable Input Field(s):
[+] Newsletter Name

Vulnerable Parameter(s):
[+] ?s=

Proof of Concept (PoC):
=======================
The remote cross site vulnerability can only be exploited by remote attackers with a privileged \
web-application 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: Payload (Exploitation)
<script>alert(document.cookie)</script>
<script>alert(document.domain)</script>

Manual steps to reproduce vulnerability ...
1. First go to following url ...
Note: http://localhost:8080/wordpress/wp-admin/admin.php?page=newsletters-supsystic&tab=newsletters_add_new
 2. Create a new newsletter
3. Include a payload as newsletter name, choose anything from newsletter list or templates \
section and click save to submit via POST method 4. The payload executes within the list after \
the malicious content is saved 5. Successful reproduce of the stored cross site scripting \
vulnerability!

Reference(s):
http://site.com:8080/wp-admin/admin.php?page=newsletters-supsystic&tab=newsletters_add_new

Solution - Fix & Patch:
=======================
The vulnerability can be patched by a parse and encode of the vulnerable `newsletter name` \
value in the webpage POST method request. Encode the parameter and restrict the value input to \
prevent further script code injection attacks. Parse the output location, were  the execution \
point occurs to prevent exploitation.

Security Risk:
==============
The security risk of the cross site scripting vulnerability in the wordpress newletter plugin \
is estimated as medium (CVSS 3.2).

Credits & Authors:
==================
King Coder -  [https://www.vulnerability-lab.com/show.php?user=King%20Coder]

Disclaimer & Information:
=========================
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