Re: [TLS] Fwd: New Version Notification for draft-moriarty-tls-oldversions-diediedie-00.txt

Yaron Sheffer <yaronf.ietf@gmail.com> Sat, 14 July 2018 16:59 UTC

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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, nalini elkins <nalini.elkins@e-dco.com>
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From: Yaron Sheffer <yaronf.ietf@gmail.com>
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Date: Sat, 14 Jul 2018 19:59:01 +0300
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Subject: Re: [TLS] Fwd: New Version Notification for draft-moriarty-tls-oldversions-diediedie-00.txt
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> 
>>> I'd encourage you to try get people to be open about
>>> things here - there's no particular shame in having 10% TLSv1.0
>>> sessions after all:-)
>>
>> It isn't a question of shame but it is just a bit too much information
>> to provide a potential adversary.  That is, to say that Stock Exchange XYZ
>> has n% of TLS1.0 clients provides a potential attacker too much
>> information.
> 
> Not sure I agree there tbh. If they're externally visible
> services, then it's public already. If they're not, and the
> attacker is inside the n/w, then the bad actor can find it
> out then. But I do understand organisations being shy about
> such things.
> 

Having gone through this exercise recently, I agree with Nalini on why 
people would not want to report openly.

For a typical enterprise, 10% TLS 1.0 in the internal network could well 
mean that 10% of your servers are Java boxes that have not been updated 
in the last two years (and so are riddled with vulnerabilities that are 
much more severe than the old TLS version). Absolutely a good reason to 
be ashamed :-) and certainly not information that you'd want to share 
openly.

Thanks,
	Yaron