Vembu StoreGrid 4.0 - Unquoted Service Path Privilege Escalation

2016-10-19 20:05:18

# 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.

Fixes

No fixes

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