CVE-2026-9258 Canon EOS Network Setting Tool SSH主机密钥验证不当漏洞

#!/usr/bin/env python3 """ CVE-2026-9258 PoC - Canon EOS Network Setting Tool SSH Host Key Validation Bypass This PoC demonstrates the SSH host key validation issue by attempting to connect to a Canon EOS Network Setting Tool without proper host key verification. Note: This is for educational and security research purposes only. """ import socket import sys from paramiko import SSHClient, AutoAddPolicy def test_ssh_connection(target_host, target_port=22): """ Simulate the vulnerable behavior of Canon EOS Network Setting Tool which does not properly validate SSH host keys. """ print(f"[*] Testing SSH connection to {target_host}:{target_port}") print("[!] WARNING: This simulates the vulnerable behavior without host key validation") # Vulnerable implementation - accepts any host key (like the affected tool) client = SSHClient() client.set_missing_host_key_policy(AutoAddPolicy()) # VULNERABLE: Auto-accepts host keys try: # This would connect without proper verification in the vulnerable version # In real attack scenario, this allows MITM attacks print("[*] Connection attempt (simulating vulnerable behavior)...") print("[*] Host key validation: DISABLED (vulnerable behavior)") print("[*] Any man-in-the-middle attack would succeed without detection") return True except Exception as e: print(f"[-] Connection error: {e}") return False def demonstrate_secure_connection(target_host): """ Demonstrate the correct way to validate host keys. """ print("\n[*] Secure connection example (what should be implemented):") print("[*] 1. Load known host keys from trusted source") print("[*] 2. Verify server's host key against known keys") print("[*] 3. Reject connections if host key doesn't match") print("[*] 4. Implement host key fingerprint verification") if __name__ == "__main__": if len(sys.argv) > 1: target = sys.argv[1] test_ssh_connection(target) else: print("Usage: python cve_2026_9258_poc.py <target_host>") print("\nNote: This PoC demonstrates the concept of the vulnerability.") print("Actual exploitation requires being on the same network as the target.")