Re: [TLS] Fwd: New Version Notification for draft-moriarty-tls-oldversions-diediedie-00.txt
Stephen Farrell <stephen.farrell@cs.tcd.ie> Fri, 13 July 2018 13:26 UTC
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To: nalini elkins <nalini.elkins@e-dco.com>
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [TLS] Fwd: New Version Notification for draft-moriarty-tls-oldversions-diediedie-00.txt
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Hiya, On 13/07/18 13:24, nalini elkins wrote: > Stephen, > > Sorry for the late reply. I was travelling to Montreal from India and > was jet lagged. No problem. And that'll be me tomorrow:-) I generally agree with Ekr's mail just now but a little bit more below... > >> >>> I am thinking the following: >>> >>> Location: U.S. / Canada (possibly U.K.) >>> >>> - 3 banks (hopefully from the top 5) >>> - 3 large insurance companies (includes back end processing) >>> - 3 U.S. federal government agencies >>> - 3 companies in the Wall Street / Stock brokerage sector (includes back >>> end processing) >>> - 3 large credit card / processors (ex. Visa, Discover, MasterCard, > etc.) >>> - 3 in the retail sector (Home Depot, Target, Lowes, et al) > >> Those are pretty small numbers unless they're interacting with >> a lot of TLS services. It'd be hard to know if they'd be >> representative of something or not if they're anonymised in the >> results. > > I would expect that these people would have quite a few applications > using TLS. Telnet, FTP, MQSeries, SMTP, and many written by the > organization itself. > > What numbers do you feel WOULD be representative? Well, for externally visible services, that information is public already and visible via e.g. censys.io and similar so you could just omit those from any numbers you report I guess. I've not thought so much about things that are only visible internally, though I did (have a student:-) do some scanning of our university n/w early this year, but I've yet to look at that data so a) I still need to verify it, and b) I'm not sure how I'd report on it in detail. That said, what he reported for port 443, was ~800 regularly seen servers in the bits of n/w he scanned with: SSLv3 (18%), TLSv1.0 (35%), TLSv1.1 (0%), TLSv1.2 (45%), TLSv1.3 (0%) Which is a tad sad;-( I think many of the SSLv3 and TLSv1.0 servers were on things like printers, conferencing boxes, access points and servers that are have basically been left running when nobody cares for 'em any more. But that's the bit I'd like to go re-check before standing over those numbers. And I'd also like to know more about how those change over time too, and look at other ports and not just 443. (Doing that is somewhere down towards the end of my to-do list but maybe I'll set another student on it later in the year.) If you could quote figures (and rate of change) like those for identified networks that'd I think be useful. If you anonymise and/or aggregate then it's a bit harder to know how to interpret the data. (E.g. the fact we're a university likely means we've more forgotten web servers I guess;-). And if they're guesses and not measurements, or if it's not clear what was measured, then it's really not so useful. I guess the thing to keep in mind is that it's better if the findings can be replicated or otherwise validated. (If it helps, my student's scanning code is at [1] but I reckon there's a good bit of work to be done to make that usable for anyone else.) >> 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. Cheers, S. [1] https://github.com/mikeyPower/final-year-project > As I say, most organizations that I know are trying very hard > to migrate from older versions. It is not as simple as it might seem. > > If the organizations need to be identified by name, then I think this will > be a show stopper for any kind of data that I might be able to provide. > Having said that, I completely understand (and share) your distrust of > anonymous data. I am at a loss as to how to proceed. > > I am open to any constructive suggestions. > > Thanks, > Nalini > > > On Wed, Jul 11, 2018 at 5:50 AM, Stephen Farrell <stephen.farrell@cs.tcd.ie> > wrote: > >> >> Hiya, >> >> On 11/07/18 06:45, nalini elkins wrote: >>> Stephen, >>> >>>> I'd love to add more detail like that and/or more sections for other >>> protocols if folks have data to offer with references. >>> >>> I believe that I can reach out to various people I know. Please comment >>> if my methodology is acceptable and if you think this will be helpful. >> >> It's not whether the methodology is acceptable to me or not >> but whether or not the references to the numbers are credible >> for readers:-) >> >> A few comment below, >> >>> >>> I am thinking the following: >>> >>> Location: U.S. / Canada (possibly U.K.) >>> >>> - 3 banks (hopefully from the top 5) >>> - 3 large insurance companies (includes back end processing) >>> - 3 U.S. federal government agencies >>> - 3 companies in the Wall Street / Stock brokerage sector (includes back >>> end processing) >>> - 3 large credit card / processors (ex. Visa, Discover, MasterCard, >> etc.) >>> - 3 in the retail sector (Home Depot, Target, Lowes, et al) >> >> Those are pretty small numbers unless they're interacting with >> a lot of TLS services. It'd be hard to know if they'd be >> representative of something or not if they're anonymised in the >> results. 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:-) >> >>> >>> Note: I put in "back end processing" because these are the folks that >> most >>> often have many connections to other business partners and so in some >> ways >>> have the most complex systems to deal with. >>> >>> Note #2: This is aspirational! I hope I can get all these people to >>> cooperate. I will try at least to get some in each category. >>> >>> >>> I will ask them the following questions: >>> >>> 1. How many applications do you have? (This may end up being only the >>> mission critical ones as otherwise it may be too hard to obtain.) >> >> I'm not sure that's so interesting for this question. And I'm not >> sure that different people would count things as applications in >> the same way. >> >>> 2. How many are using TLS and how many are still plain text? (We will >>> disregard SSH and other such variants.) >> >> Again, that's not so interesting here. >> >>> 3. What percent of clients are using a pre-TLS1.2 version? (This will >> be >>> an estimation. >> I don't see why this needs to be estimated, this is kinda the key >> measurement needed and easy to measure. There should be no need for >> anyone to stick their thumb in the air for this:-) >> >> It'd be good to distinguish TLSv1.0 from TLSv1.1 (and SSLv3 and >> TLSv1.3) and to say for how many TLS sessions or hosts/IPs the >> figures apply. >> >> And of course providing as much context as possible so that it's >> possible to understand the numbers and whether or not the numbers >> from different sources are based on the same or different kinds of >> measurement. >> >>> >>> 4. Do you have an active project to migrate off of older versions of >> TLS? >> >> Sure. >> >>> >>> 5. What do you estimate your percent of clients using pre-TLS1.2 >> versions >>> to be next year? >> >> I don't see how this'd be so useful. Aaking about the historic and >> current rates of change of use of the various protocol versions would >> be good though if people have that, but they may not. >> >> S. >> >>> >>> >>> Please let me know if this will be of use & if you have suggestions for >>> improvement. >>> >>> Thanks, >>> Nalini >>> >>> >>> >>> >>> On Tue, Jul 10, 2018 at 1:51 PM, Stephen Farrell < >> stephen.farrell@cs.tcd.ie> >>> wrote: >>> >>>> >>>> Hi Nalini, >>>> >>>> On 10/07/18 04:50, nalini elkins wrote: >>>>> It would be nice to see some of this reflected in the draft rather than >>>>> only statistics on browsers. The real usage of these protocols is far >>>>> more complex. >>>> >>>> I didn't have time before the I-D cutoff but have since >>>> added a section on mail to the repo pre-01 version. (See >>>> [1] section 3.2.) I'd love to add more detail like that >>>> and/or more sections for other protocols if folks have >>>> data to offer with references. >>>> >>>> Consistent with other folks' numbers sent to the list >>>> yesterday, (though based on a much smaller sat of data I >>>> guess;-) my data shows 10.6% use of TLSv1.0 when talking >>>> SMTP/IMAP/POP (or HTTP) over TLS to a population of ~200K >>>> IP addresses that listen on port 25 (mail servers). >>>> >>>> What I don't currently have is a rate of change for that >>>> figure. I think that rate of change is the important number >>>> for figuring out what to do in the next while. E.g. The >>>> WG might conclude that if the percentage of TLSv1.0 is >>>> moving down nicely, we should be a bit patient. If it's >>>> not moving at all, we can probably move now or in 5 years >>>> without that being different. If we're not sure, then get >>>> more data... >>>> >>>> Cheers, >>>> S. >>>> >>>> [1] >>>> https://github.com/sftcd/tls-oldversions-diediedie/blob/mast >>>> er/draft-moriarty-tls-oldversions-diediedie.txt >>>> >>> >>> >>> >> > > >
- Re: [TLS] Fwd: New Version Notification for draft… Stephen Farrell
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Hubert Kario
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Peter Gutmann
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Eric Rescorla
- Re: [TLS] Fwd: New Version Notification for draft… Peter Gutmann
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Eric Rescorla
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Hubert Kario
- [TLS] raising ceiling vs. floor (was: New Version… Viktor Dukhovni
- Re: [TLS] Fwd: New Version Notification for draft… nalini elkins
- Re: [TLS] Fwd: New Version Notification for draft… Martin Thomson
- Re: [TLS] Fwd: New Version Notification for draft… Martin Rex
- Re: [TLS] Fwd: New Version Notification for draft… Eric Rescorla
- Re: [TLS] Fwd: New Version Notification for draft… Eric Rescorla
- [TLS] Fwd: New Version Notification for draft-mor… Kathleen Moriarty
- Re: [TLS] Fwd: New Version Notification for draft… Loganaden Velvindron
- Re: [TLS] Fwd: New Version Notification for draft… Salz, Rich
- Re: [TLS] Fwd: New Version Notification for draft… Salz, Rich
- Re: [TLS] Fwd: New Version Notification for draft… Alessandro Ghedini
- Re: [TLS] Fwd: New Version Notification for draft… Andrei Popov
- Re: [TLS] Fwd: New Version Notification for draft… Eric Mill
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Peter Gutmann
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Viktor Dukhovni
- Re: [TLS] raising ceiling vs. floor (was: New Ver… David Benjamin
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Peter Gutmann
- Re: [TLS] Fwd: New Version Notification for draft… Viktor Dukhovni
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Hubert Kario
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Phil Pennock
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Hubert Kario
- Re: [TLS] Fwd: New Version Notification for draft… Stephen Farrell
- Re: [TLS] [CAUTION] Re: Fwd: New Version Notifica… Martin Rex
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Peter Gutmann
- Re: [TLS] Fwd: New Version Notification for draft… nalini elkins
- Re: [TLS] Fwd: New Version Notification for draft… Stephen Farrell
- Re: [TLS] raising ceiling vs. floor (was: New Ver… Hubert Kario
- Re: [TLS] Fwd: New Version Notification for draft… Eric Rescorla
- Re: [TLS] Fwd: New Version Notification for draft… Salz, Rich
- Re: [TLS] [CAUTION] Re: Fwd: New Version Notifica… Kathleen Moriarty
- Re: [TLS] Fwd: New Version Notification for draft… Kathleen Moriarty
- Re: [TLS] Fwd: New Version Notification for draft… Kathleen Moriarty
- Re: [TLS] Fwd: New Version Notification for draft… David Benjamin
- Re: [TLS] Fwd: New Version Notification for draft… nalini elkins
- Re: [TLS] Fwd: New Version Notification for draft… Eric Rescorla
- Re: [TLS] Fwd: New Version Notification for draft… Stephen Farrell
- Re: [TLS] Fwd: New Version Notification for draft… Christopher Wood
- Re: [TLS] Fwd: New Version Notification for draft… Yaron Sheffer
- Re: [TLS] Fwd: New Version Notification for draft… Hubert Kario
- Re: [TLS] Fwd: New Version Notification for draft… Jeremy Harris
- Re: [TLS] Fwd: New Version Notification for draft… Artyom Gavrichenkov
- Re: [TLS] Fwd: New Version Notification for draft… Stephen Farrell
- Re: [TLS] Fwd: New Version Notification for draft… Artyom Gavrichenkov