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Re: [quicwg/base-drafts] Complete version negotiation failure (#1917)

Igor Lubashev <notifications@github.com> Wed, 07 November 2018 10:00 UTC

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From: Igor Lubashev <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Complete version negotiation failure (#1917)
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@mikkelfj, trying to mitigate this injection DoS attack is much harder than merely "waiting a bit before failing". If your implementation waits a bit in case of no common version in VN packet, what would it do, if an attacker injects a VN packet with a version you do support (which arrives before a reply from the server that actually supported your initial version)?  What if the attacker races to the server a packet with your 4-tuple, CIDs, and version but different contents, establishing a connection on the server for you, which you would not be able to decrypt? Etc.

I'd rather defer mitigations, if any are possible, to a later version of this draft (or a different draft).

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