Re: [TLS] [Last-Call] Last Call: <draft-ietf-tls-oldversions-deprecate-09.txt> (Deprecating TLSv1.0 and TLSv1.1) to Best Current Practice

Keith Moore <moore@network-heretics.com> Wed, 02 December 2020 12:11 UTC

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To: Peter Gutmann <pgut001@cs.auckland.ac.nz>, Eliot Lear <lear@cisco.com>
Cc: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "last-call@ietf.org" <last-call@ietf.org>, "draft-ietf-tls-oldversions-deprecate@ietf.org" <draft-ietf-tls-oldversions-deprecate@ietf.org>, "tls-chairs@ietf.org" <tls-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
References: <160496076356.8063.5138064792555453422@ietfa.amsl.com> <49d045a3-db46-3250-9587-c4680ba386ed@network-heretics.com> <b5314e17-645a-22ea-3ce9-78f208630ae1@cs.tcd.ie> <1606782600388.62069@cs.auckland.ac.nz> <0b72b2aa-73b6-1916-87be-d83e9d0ebd09@cs.tcd.ie> <1606814941532.76373@cs.auckland.ac.nz> <36C74BF4-FF8A-4E79-B4C8-8A03BEE94FCE@cisco.com> <1606905451349.74964@cs.auckland.ac.nz>
From: Keith Moore <moore@network-heretics.com>
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Date: Wed, 2 Dec 2020 07:11:30 -0500
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Subject: Re: [TLS] [Last-Call] Last Call: <draft-ietf-tls-oldversions-deprecate-09.txt> (Deprecating TLSv1.0 and TLSv1.1) to Best Current Practice
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On 12/2/20 5:37 AM, Peter Gutmann wrote:

>> If a device can be at all critical (and even if it isn’t), then it should be
>> upgraded or replaced.
> The fact that many of these devices are extremely critical is precisely why
> they're never replaced or upgraded, because they can't be taken out of
> production.

+1

Another problem is that "upgrades" often don't function identically to 
the firmware or equipment it would be replacing, making replacement 
inherently disruptive even if it didn't require a shutdown.

Under current conditions, relying on upgrades to fix security issues in 
industrial environments is a nonstarter.   There's a tremendous amount 
of inertia to overcome at many different levels.

Keith