We’ve recently discovered that the Mac GlobalProtect client does not terminate existing network connections after full tunnel with no access to local network is established. This is reproducible In the following procedure:
In practice, this allows one to create a split tunnel. We’ve had several folks test this by RDPing into a system on their home network, and being able to continue to control the system after the VPN connection is established. There is no “reconnect”, it appears to be uninterrupted. Other VPN solutions like Anyconnect, Pulse secure (both full tunnel with no access to local network) successfully terminate existing connection. This is a security concern as this would be usable as a covert C2 channel.
Does anyone have any suggestions on terminating existing connection on Mac?
In my opinion, allowing the users to manually connect and disconnect is the actual security concern.
But I understand the issue and I don't know exactly if this is "expected behavior" or a bug. To clarify this you should create a TAC case and ask support/engineering about this one.
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