Improper validation of SSH host keys in Canon EOS Network Setting Tool Version 1.5.0 or earlier
CVSS Details
CVSS Score
6.5
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Configurations (Affected Products)
No configuration data available.
Canon EOS Network Setting Tool <= 1.5.0
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
#!/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.")