Wordpress Newsletter Supsystic 1.1.7 - Cross Site Scripting Vulnerability
Vulnerability Laboratory ID (VL-ID):
Common Vulnerability Scoring System:
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)
Product: Newsletter by Supsystic - Wordpress Plugin (Web-Application) 1.1.7
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.
[+] Contentive Theme (Wordpress)
Vulnerable Input Field(s):
[+] Newsletter Name
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)
Manual steps to reproduce vulnerability ...
1. First go to following url ...
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!
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.
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:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or
implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any
case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability Labs or its
suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability mainly for incidental
or consequential damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface
websites, hack into databases or trade with stolen data. We have no need for criminal activities or membership requests. We do not publish advisories
or vulnerabilities of religious-, militant- and racist- hacker/analyst/researcher groups or individuals. We do not publish trade researcher mails,
phone numbers, conversations or anything else to journalists, investigative authorities or private individuals.
Domains: www.vulnerability-lab.com - www.vulnerability-db.com - www.evolution-sec.com
Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register.php
Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php
Social: twitter.com/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab
Any modified copy or reproduction, including partially usages, of this file, resources or information requires authorization from Vulnerability Laboratory.
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by
Vulnerability Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark
of vulnerability-lab team & the specific authors or managers. To record, list, modify, use or edit our material contact (admin@) to get an ask permission.
Copyright A(c) 2017 | Vulnerability Laboratory - [Evolution Security GmbH]aC/
VULNERABILITY LABORATORY - RESEARCH TEAM