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Got in touch with ProtonVPN support and asked about this. Here’s their reply:
Our engineers have conducted a thorough analysis of this threat, reconstructed it experimentally, and tested it on Proton VPN.
We concluded that:
- The attack can only be carried out if the local network itself is compromised
- Our Windows and Android apps are protected against it
- For iOS and macOS apps, you are completely protected from this as long as you’re using a Kill Switch and a WireGuard-based protocol (our apps use them by default, and if a user wants to use something other than WireGuard derivates, they’d have to manually set it up). Note that Stealth, WireGuard TCP and Smart protocol on iOS/macOS are all WireGuard-based.
- For our Linux app, we’re working on a fix that would provide full protection against it.
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