Novel attack against virtually all VPN apps neuters their entire purpose
TunnelVision vulnerability has existed since 2002 and may already be known to attackers.
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To be fair, any proper VPN setup that only relies on the routing table like this is flawed to begin with.
If the VPN program dies or the network interface disappears, the routes are removed aswell, allowing traffic to leave the machine without the VPN.
So it is already a good practice to block traffic where it shouldnt go (or even better, only allowing it where it should).
Many VPN-Programs by Providers already have settings to enable this to prevent "leaking".
