Re: [quicwg/base-drafts] Add initial threat model appendix (#2925)

Eric Kinnear <> Tue, 03 September 2019 23:50 UTC

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From: Eric Kinnear <>
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Subject: Re: [quicwg/base-drafts] Add initial threat model appendix (#2925)
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erickinnear commented on this pull request.

> +or other methods.
+2. An on-path attacker can prevent migration to a new path for which the
+attacker is also on-path by causing path validation to fail on the new path.
+3. An on-path attacker cannot prevent a client from migrating to a path for
+which the attacker is not on-path.
+4. An on-path attacker can reduce the throughput of a connection by delaying
+packets or dropping them.
+### Off-Path Attacker
+An off-path attacker is not directly on the path between the QUIC client and
+server, but is able to obtain copies of all packets sent between the client and

Updated, very good point, I think here I'm focusing mostly on the worst-case type of behavior (for example, assume an attacker can _always_ win a race), but I think there would be room to cover additional situations, both in the case where that changes the considerations or simply as a note that "these people also fall into this bucket".

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