Comodo Chromodo Browser Privilege Escalation
Posted on 07 October 2016
# 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 FilesComodoChromodochromodo_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
