Vulnerability Details

ProtonVPN for Windows suffers from a SYSTEM privilege escalation vulnerability through the ProtonVPN Service. This service establishes an NetNamedPipe endpoint that allows arbitrary installed applications to connect and call publicly exposed methods. The Connect method accepts a class instance argument that provides attacker control of the OpenVpncommand line. An attacker can specify a dynamic library plugin that should run for every new VPN connection. This plugin will execute code in the context of the SYSTEM user.

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