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Re: [quicwg/base-drafts] Disconnect with Initial Injection (#1951)

Marten Seemann <notifications@github.com> Fri, 30 November 2018 03:15 UTC

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Subject: Re: [quicwg/base-drafts] Disconnect with Initial Injection (#1951)
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> After the Handshake keys are known, endpoints can ignore ACK frames entirely.

Which requires implicit acking, along the lines of #2045, which I think is the best fix we have for the injection attack.

> Before the Handshake keys are exchanged, you need to rely on ACKs. At that moment, having rules to reject certain ACKs never hurts.

True, but it doesn't fix this issue. There are various ways to defend against injections during the 3-way handshake, and implementations may do something fancy here, but I don't think we have the tools to completely prevent this attack yet.

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