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Novel attack against virtually all VPN apps neuters their entire purpose (arstechnica.com)
submitted 6 months ago by floofloof@lemmy.ca to c/technology@lemmy.ml
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[-] dave@feddit.uk 16 points 6 months ago

Partially. The summary isn’t quite in line with the detail:

Android is the only operating system that fully immunizes VPN apps from the attack because it doesn't implement option 121. For all other OSes, there are no complete fixes. When apps run on Linux there’s a setting that minimizes the effects, but even then TunnelVision can be used to exploit a side channel that can be used to de-anonymize destination traffic and perform targeted denial-of-service attacks.

[-] AndrasKrigare@beehaw.org 3 points 6 months ago

I disagree with one of their points

Network firewalls can also be configured to deny inbound and outbound traffic to and from the physical interface. This remedy is problematic for two reasons: (1) a VPN user connecting to an untrusted network has no ability to control the firewall and (2) it opens the same side channel present with the Linux mitigation.

Sure, they can't control the network firewall, but why would you do that when you can change your local firewall? Set an iptables rule to drop all traffic going out the physical interface that isn't destined for the VPN server. I'm 70% sure some vpn clients do this automatically.

this post was submitted on 07 May 2024
153 points (97.5% liked)

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