Re: [tcpm] Roman Danyliw's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT)
"touch@strayalpha.com" <touch@strayalpha.com> Sat, 08 January 2022 05:13 UTC
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From: "touch@strayalpha.com" <touch@strayalpha.com>
In-Reply-To: <5c85c503-9113-6887-2c56-9b8fd9c0b469@mti-systems.com>
Date: Fri, 07 Jan 2022 21:13:11 -0800
Cc: Roman Danyliw <rdd@cert.org>, The IESG <iesg@ietf.org>, draft-ietf-tcpm-rfc793bis@ietf.org, tcpm IETF list <tcpm@ietf.org>, tcpm-chairs@ietf.org
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References: <163236958629.2342.800968324528950977@ietfa.amsl.com> <5c85c503-9113-6887-2c56-9b8fd9c0b469@mti-systems.com>
To: Wes Eddy <wes@mti-systems.com>
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Subject: Re: [tcpm] Roman Danyliw's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT)
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> On Jan 7, 2022, at 12:12 PM, Wesley Eddy <wes@mti-systems.com> wrote: > >> ** Section 3.4. Per “There are security issues that result if an off-path >> attacker is able to predict or guess ISN values”, a reference might be helpful >> for this statement. Perhaps [41] or [Morris185] from [41]. > ACK; Zahed also mentioned this and I think [41] is a good reference because it includes some more context beyond just [Morris1985] alone, and of course it includes reference to [Morris1985] itself as well. > The ISN is relevant only during the TWHS; otherwise, it’s not. I really wish we’d stop worrying so much about the ISN itself. I.e., ISNs aren’t the issue; being able to guess or hit *inside the active window* is. That can happen two ways - knowing the ISN *or* having the sequence numbers move through the whole number space. And the latter is not mitigated by any sort of magically unpredictable ISN. Joe
- [tcpm] Roman Danyliw's No Objection on draft-ietf… Roman Danyliw via Datatracker
- Re: [tcpm] Roman Danyliw's No Objection on draft-… touch@strayalpha.com
- Re: [tcpm] Roman Danyliw's No Objection on draft-… Colin Perkins
- Re: [tcpm] Roman Danyliw's No Objection on draft-… Roman Danyliw
- Re: [tcpm] Roman Danyliw's No Objection on draft-… Benjamin Kaduk
- Re: [tcpm] Roman Danyliw's No Objection on draft-… Wesley Eddy
- Re: [tcpm] Roman Danyliw's No Objection on draft-… touch@strayalpha.com