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OpenVPN Private Tunnel 2.8.4 Unquoted Service Path

OpenVPN Private Tunnel 2.8.4 Unquoted Service Path
Posted Nov 1, 2019
Authored by Sainadh Jamalpur

OpenVPN Private Tunnel version 2.8.4 suffers from an ovpnagent unquoted service path vulnerability.

tags | exploit
SHA-256 | 601b759e7aa7665e1861a3a3970a92ae3c6a1cd2db186097845882044c1600b9

OpenVPN Private Tunnel 2.8.4 Unquoted Service Path

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# Title: OpenVPN Private Tunnel 2.8.4 - 'ovpnagent' Unquoted Service Path
# Author: Sainadh Jamalpur
# Date: 2019-10-31
# Vendor Homepage: https://openvpn.net/
# Software Link: https://swupdate.openvpn.org/privatetunnel/client/privatetunnel-win-2.8.exe
# Version : PrivateTunnel v2.8.4
# Tested on: Windows 10 64bit(EN)
# CVE : N/A

# =====================================================
# 1. Description:
# Unquoted service paths in OpenVPN Private Tunnel v2.8.4 have an unquoted service path.

#PoC
===========
C:\>sc qc ovpnagent
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: ovpnagent
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Program Files (x86)\OpenVPN
Technologies\PrivateTunnel\ovpnagent.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : OpenVPN Agent
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

C:\>

#Exploit:
============
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.
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