Realtek Audio Service 1.0.0.55 - 'RtkAudioService64.exe' Unquoted Service Path

# Exploit Title: Realtek Audio Service 1.0.0.55 - 'RtkAudioService64.exe' Unquoted Service Path
# Discovery by: Erika Figueroa
# Discovery Date: 2020-11-07
# Vendor Homepage: https://www.realtek.com/en/
# Tested Version: 1.0.0.55
# Vulnerability Type: Unquoted Service Path
# Tested on OS: Windows 8.1 x64 es

# Step to discover Unquoted Service Path: 

C:\>wmic service get name, pathname, displayname, startmode | findstr /i "Auto" | findstr /i /v "C:\Windows\\" | findstr /i "CodeMeter" | findstr /i /v """

Realtek Audio Service                                                   RtkAudioService                     C:\Program Files\Realtek\Audio\HDA\RtkAudioService64.exe            Auto
# Service info:

C:\>sc qc "RtkAudioService"
[[SC] QueryServiceConfig CORRECTO

NOMBRE_SERVICIO: RtkAudioService
        TIPO               : 10  WIN32_OWN_PROCESS
        TIPO_INICIO        : 2   AUTO_START
        CONTROL_ERROR      : 1   NORMAL
        NOMBRE_RUTA_BINARIO: C:\Program Files\Realtek\Audio\HDA\RtkAudioService64.exe
        GRUPO_ORDEN_CARGA  : PlugPlay
        ETIQUETA           : 0
        NOMBRE_MOSTRAR     : Realtek Audio Service
        DEPENDENCIAS       :
        NOMBRE_INICIO_SERVICIO: LocalSystem

#Exploit:

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.