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Windows hosts which connect to a network as configured above will, by default, push all HTTP(S) traffic through the HTTP proxy at :3128. The following PAC script can be can be provided to proxy all HTTP(S) traffic through a Web Proxy hosted at :3128:
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The dhcp-option=252 option specifies the URL from which Windows hosts will download the PAC script. The following dnsmasq configuration can be used to provide a PAC file to Windows hosts via WPAD DHCP:ĭhcp-range=192.168.100.100,192.168.100.199,10m When the system connects to the PIA VPN service we can see that the proxy setting are still honoured. When a Windows system attaches to this network, the advertised PAC file will be downloaded and the proxy settings configured. The PAC script sets the default proxy to an HTTP proxy on the internet, in this case a fictitious proxy at. Provided here is a Proof of Concept setup which will act as a network gateway, providing a PAC script via DHCP. However, clients with specifically configured PAC files (using the "Use automatic configuration script" option in the Windows "Local Area Network (LAN) Settings" configuration) may still be at risk. It should be noted that disabling the default "Automatically detect settings" option in the Windows "Local Area Network (LAN) Settings" configuration mitigates this issue. WPAD/PAC is enabled by default on all modern desktop versions of Windows.
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This issue has been confirmed on Windows 10 and Windows 7 (under default configuration) with PIA Client v56. However, as this issue was originally identified on the PIA Client we would like to inform London Trust Media of the details. This issue appears to be an underlying issue in OpenVPN (confirmed in OpenVPN version 2.3.10) we have reported this issue to the OpenVPN security team. PIA Client v56 for Windows is based on OpenVPN version 2.2.2. The "PAC proxy" can log all traffic, defeating the confidentiality provided by PIA, or modify traffic in transit to affect the integrity of the VPN traffic. When the client initialises a VPN connection to PIA this configuration remains.īefore VPN connection: client -> malicious network -> PAC proxy -> internetĪfter VPN connection: client -> malicious network -> VPN server -> PAC proxy -> internet
When a Windows system receives DHCP option 252, the advertised PAC script is downloaded and the proxy settings are configured.
This allows a malicious network operator, such as a rogue access point, to proxy all VPN-tunnelled HTTP(S) requests for PIA VPN users connecting from their network.Ī malicious network can provide proxy settings over DHCP through DHCP option 252, this option provides a URL to a PAC script. WPAD settings configure system and application HTTP proxies via Proxy Auto-Config (PAC) scripts. The PIA client for Windows honours the Web Proxy Auto-Discovery (WPAD) settings configured by the local network the client is connecting from. Private Internet Access(PIA) VPN users connecting to the PIA VPN service from an untrusted/malicious network are at risk of having all VPN tunnelled HTTP(S) traffic intercepted. Reporter: Alex Chapman and Paul Stone of Context Information Security Versions Affected: PIA Client v56 for Windows
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Patch notes resulting from this bug report be viewed at ĭescription: PIA Client HTTP(S) Tunnelled Traffic Interception
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