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Vembu StoreGrid 4.0 Privilege Escalation

Vembu StoreGrid 4.0 Privilege Escalation
Posted Oct 20, 2016
Authored by Joey Lane

Vembu StoreGrid version 4.0 suffers from an unquoted service path privilege escalation vulnerability.

tags | exploit
SHA-256 | b29c6ffdfe8537775002f7b4833de5c4b184dc26403ea8e7b174a09ca583ed19

Vembu StoreGrid 4.0 Privilege Escalation

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# 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.


---------------------------------------------------------------------------

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

---------------------------------------------------------------------------


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.


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