Acer Backup Manager Module Unquoted Service Path

CVE Category Price Severity
CVE-2019-5239 CWE-427 $5,000 High
Author Risk Exploitation Type Date
Dominik Ru00f6ttsches of Google Project Zero High Local 2021-05-20
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/S:C/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

Acer Backup Manager Module Unquoted Service Path
# Exploit Title: Acer Backup Manager Module - 'IScheduleSvc.exe'  Unquoted Service Path
# Discovery by: Emmanuel Lujan
# Discovery Date: 2021-05-19
# Vendor Homepage:
# Tested Version:
# 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 """

NTI IScheduleSvc                                                        NTI ISch
eduleSvc                              C:\Program Files (x86)\NTI\Acer Backup Man
ager\IScheduleSvc.exe                                     Auto

# Service info:

C:\>sc qc "NTI IScheduleSvc"
[SC] QueryServiceConfig SUCCESS

        TYPE               : 110  WIN32_OWN_PROCESS <interactive>
        START_TYPE         : 2   AUTO_START  
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files (x86)\Acer Backup Manager\IScheduleSvc.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : NTI IScheduleSvc
        DEPENDENCIES       :                            
        SERVICE_START_NAME : LocalSystem


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.

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