OpenVPN Private Tunnel Core Service – Unquoted Service Path Privilege Escalation
OpenVPN Private Tunnel Core Service Unquoted Service Path Elevation Of Privilege Vendor: OpenVPN Technologies, Inc Product web page: http://www.openvpn.net Affected version: 2.1.28.0 (PrivateTunnel 2.3.8) Summary: Private Tunnel is a new approach to true Internet security creating a Virtual Private Tunnel (VPT) or Virtual Private Network (VPN) that encrypts, privatizes, and protects your Internet traffic. Desc: Private Tunnel application suffers from an unquoted search path issue impacting the Core Service 'ptservice' service for Windows deployed as part of PrivateTunnel bundle. This could potentially allow an authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. A successful attempt would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could potentially be executed during application startup or reboot. If successful, the local user's code would execute with the elevated privileges of the application. Tested on: Microsoft Windows 7 Professional SP1 (EN) Microsoft Windows XP Professional SP3 (EN) Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2014-5192 Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2014-5192.php 07.07.2014 --- C:\Users\user>sc qc ptservice [SC] QueryServiceConfig SUCCESS SERVICE_NAME: ptservice TYPE : 10 WIN32_OWN_PROCESS START_TYPE : 2 AUTO_START ERROR_CONTROL : 1 NORMAL BINARY_PATH_NAME : C:\Program Files (x86)\OpenVPN Technologies\PrivateTunnel\ptservice.exe LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : Private Tunnel Core Service DEPENDENCIES : SERVICE_START_NAME : LocalSystem C:\Users\user>icacls "C:\Program Files (x86)\OpenVPN Technologies\PrivateTunnel\ptservice.exe" C:\Program Files (x86)\OpenVPN Technologies\PrivateTunnel\ptservice.exe NT AUTHORITY\SYSTEM:(I)(F) BUILTIN\Administrators:(I)(F) BUILTIN\Users:(I)(RX) Successfully processed 1 files; Failed processing 0 files C:\Users\user> |