Comment on Novel attack against virtually all VPN apps neuters their entire purpose

MonkderDritte@feddit.de ⁨9⁩ ⁨months⁩ ago

• NeatNit@discuss.tchncs.de ⁨9⁩ ⁨months⁩ ago

  This technique can also be used against an already established VPN connection once the VPN user’s host needs to renew a lease from our DHCP server. We can artificially create that scenario by setting a short lease time in the DHCP lease, so the user updates their routing table more frequently. In addition, the VPN control channel is still intact because it already uses the physical interface for its communication. In our testing, the VPN always continued to report as connected, and the kill switch was never engaged to drop our VPN connection.

  Sounds to me like it totally works even after the tunnel has started.

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  • Natanael@slrpnk.net ⁨9⁩ ⁨months⁩ ago

    Yeah, it’s like a fake traffic cop basically, sending your (network) traffic down the wrong route

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    • KairuByte@lemmy.dbzer0.com ⁨9⁩ ⁨months⁩ ago

      More like a corrupt traffic cop. There are reasons you might want this kind of functionality, which is why it exists. Normally you can trust the cop (DHCP server) but in this case the cop has decided to send everyone from all streets down to the docks.

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      • Natanael@slrpnk.net ⁨9⁩ ⁨months⁩ ago

        These types of attacks would likely be implemented via DHCP spoofing / poisoning, unless you’re on a malicious network

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• DreamlandLividity@lemmy.world ⁨9⁩ ⁨months⁩ ago

  No, it works at any point and the local network needs to be compromised (untrusted), the host can be secure.

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  • MonkderDritte@feddit.de ⁨9⁩ ⁨months⁩ ago

    Yikes

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    • DreamlandLividity@lemmy.world ⁨9⁩ ⁨months⁩ ago

      That being said, it apparently does not affect Mullvad on any platform other than iOS (Apple does not allow fixing it on iOS). I suspect other serious VPNs are also not vulnerable outside iOS.

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  • seth@lemmy.world ⁨9⁩ ⁨months⁩ ago

    Yes, and also is fine if you’re using a cell hotspot.

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