Re: [quicwg/base-drafts] handling of coalesced packets with decryption errors creates DoS opportunity (#2308)

Igor Lubashev <notifications@github.com> Sat, 12 January 2019 06:33 UTC

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Subject: Re: [quicwg/base-drafts] handling of coalesced packets with decryption errors creates DoS opportunity (#2308)
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We also talked in Kista about using just such coalesced packets for PMTU probing.  I.e. coalescing a short long-header packet that will not decrypt but contains Server's Connection ID with a short-header packet that has the actual payload.

If the UDP datagram does get delivered, the long-header packet will be discarded and the short-header packet -- ACKed.  If this UDP datagram runs into an MTU problem, the response ICMP will contain Server Connection ID, and it will be routed to the correct backend.

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