Comodo Chromodo Browser - Unquoted Service Path Privilege Escalation

EDB-ID:

40473

CVE:

N/A

Author:

Th3GundY

Type:

local

Platform:

Windows

Published:

2016-10-06

# Exploit Title: Comodo Chromodo Browser Unquoted Service Path Privilege Escalation
# Date: 03/10/2016
# Author: Yunus YILDIRIM (@Th3GundY)
# Team: CT-Zer0 (@CRYPTTECH)
# Website: http://yildirimyunus.com
# Contact: yunusyildirim@protonmail.com
# Category: local
# Vendor Homepage: https://www.comodo.com
# Software Link: https://www.comodo.com/home/browsers-toolbars/chromodo-private-internet-browser.php
# Version: Software Version <= 52.15.25.664
# Tested on: Windows 7 x86/x64

1. Description

Comodo Chromodo Browser Update Service (ChromodoUpdater) installs as a service with 
an unquoted service path running with SYSTEM privileges.
This could potentially allow an authorized but non-privileged local
user to execute arbitrary code with elevated privileges on the system.


2. Proof of Concept

C:\>sc qc ChromodoUpdater
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: ChromodoUpdater
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files\Comodo\Chromodo\chromodo_updater.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : COMODO Chromodo Update Service
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

		
3. Exploit:
 
A successful attempt would require the local attacker must insert an executable file
in the path of the service.
Upon service restart or system reboot, the malicious code will be run with elevated privileges.


Additional notes :

Fixed in version 52.15.25.665
https://forums.comodo.com/news-announcements-feedback-cd/chromodo-v521525665-is-now-available-for-download-t116787.0.html

Vulnerability Disclosure Timeline:
=========================
03/10/2016   -   Contact With Vendor
03/10/2016   -   Vendor Response
05/10/2016   -   Release Fixed Version