On the recent Windows versions, TLS 1.0 is negotiated more than 10% of the time on the client side (this includes non-browser connections from all sorts of apps, some hard-coding TLS versions), and TLS 1.1 accounts for ~0.3% of client connections. Windows server negotiates TLS 1.0 ~1.5% of the time (all server apps, not just IIS), and the use of TLS 1.1 is negligible.
Therefore, we cannot disable TLS 1.0 by default in Windows just yet, but will keep looking at the telemetry. If PCI/NIST/diediedie RFC make a difference, I’ll be happy to reduce the set of enabled-by-default TLS versions. Cheers, Andrei From: TLS <tls-boun...@ietf.org> On Behalf Of Eric Rescorla Sent: Monday, July 9, 2018 9:57 AM To: Kathleen Moriarty <kathleen.moriarty.i...@gmail.com> Cc: <tls@ietf.org> <tls@ietf.org> Subject: Re: [TLS] Fwd: New Version Notification for draft-moriarty-tls-oldversions-diediedie-00.txt On Mon, Jul 9, 2018 at 9:54 AM, Eric Rescorla <e...@rtfm.com<mailto:e...@rtfm.com>> wrote: Thanks for writing this. I would be in favor of deprecating old versions of TLS prior to 1.2. Firefox Telemetry shows that about 1% of our connections are TLS 1.1 This should be 1.0. (on the same data set, TLS 1.3 is > 5%), and TLS 1.1 is negligible. This is probably a higher number than we'd be comfortable turning off immediately, but it is probably worth starting the process. -Ekr On Mon, Jul 9, 2018 at 9:40 AM, Kathleen Moriarty <kathleen.moriarty.i...@gmail.com<mailto:kathleen.moriarty.i...@gmail.com>> wrote: Hello, Stephen and I posted the draft below to see if the TLS working group is ready to take steps to deprecate TLSv1.0 and TLSv1.1. There has been a recent drop off in usage for web applications due to the PCI Council recommendation to move off TLSv1.0, with a recommendation to go to TLSv1.2 by June 30th. NIST has also been recommending TLSv1.2 as a baseline. Applications other than those using HTTP may not have had the same reduction in usage. If you are responsible for services where you have a reasonable vantage point to gather and share statistics to assess usage further, that could be helpful for the discussion. We've received some feedback that has been incorporated into the working draft and feelers in general have been positive. It would be good to know if there are any show stoppers that have not been considered. https://github.com/sftcd/tls-oldversions-diediedie<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fsftcd%2Ftls-oldversions-diediedie&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215001514&sdata=6JSQZe93nWnAELvOgG3KyIcPopQleMDtNF6v8LWFXWU%3D&reserved=0> Thanks in advance, Kathleen ---------- Forwarded message ---------- From: <internet-dra...@ietf.org<mailto:internet-dra...@ietf.org>> Date: Mon, Jun 18, 2018 at 3:05 PM Subject: New Version Notification for draft-moriarty-tls-oldversions-diediedie-00.txt To: Stephen Farrell <stephen.farr...@cs.tcd.ie<mailto:stephen.farr...@cs.tcd.ie>>, Kathleen Moriarty <kathleen.moriarty.i...@gmail.com<mailto:kathleen.moriarty.i...@gmail.com>> A new version of I-D, draft-moriarty-tls-oldversions-diediedie-00.txt has been successfully submitted by Stephen Farrell and posted to the IETF repository. Name: draft-moriarty-tls-oldversions-diediedie Revision: 00 Title: Deprecating TLSv1.0 and TLSv1.1 Document date: 2018-06-18 Group: Individual Submission Pages: 10 URL: https://www.ietf..org/internet-drafts/draft-moriarty-tls-oldversions-diediedie-00.txt<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Finternet-drafts%2Fdraft-moriarty-tls-oldversions-diediedie-00.txt&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215011518&sdata=%2BBRGmMbf7r4mXoyWqHmT6kgNjHw7Drh7ldDceG5gqfQ%3D&reserved=0> Status: https://datatracker.ietf.org/doc/draft-moriarty-tls-oldversions-diediedie/<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-moriarty-tls-oldversions-diediedie%2F&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215011518&sdata=Qge2nvcx8fz105Uux1rl1eM2yHiI7zbvxA8Pvps10z8%3D&reserved=0> Htmlized: https://tools.ietf.org/html/draft-moriarty-tls-oldversions-diediedie-00<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-moriarty-tls-oldversions-diediedie-00&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215021535&sdata=Bz6FrvviPoSIxkB83boGxcOxVg2NvrqS3A1bUinNodc%3D&reserved=0> Htmlized: https://datatracker.ietf.org/doc/html/draft-moriarty-tls-oldversions-diediedie<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-moriarty-tls-oldversions-diediedie&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215021535&sdata=M1O48yPTPkd%2Bb3%2FE3z0%2FAniBUMozDwfQzp2Ra5sLRbQ%3D&reserved=0> Abstract: This document [if approved] formally deprecates Transport Layer Security (TLS) versions 1.0 [RFC2246] and 1.1 [RFC4346] and moves these documents to the historic state. These versions lack support for current and recommended cipher suites, and various government and industry profiiles of applications using TLS now mandate avoiding these old TLS versions. TLSv1.2 has been the recommended version for IETF protocols since 2008, providing sufficient time to transition away from older versions. Products having to support older versions increase the attack surface unnecessarily and increase opportunities for misconfigurations. Supporting these older versions also requires additional effort for library and product maintenance. This document updates the backward compatibility sections of TLS RFCs [[list TBD]] to prohibit fallback to TLSv1.0 and TLSv1.1. This document also updates RFC 7525. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftools.ietf.org&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215031539&sdata=ixEPAZe51d1FhvdB9sQ8mzRHY04Blyx%2BIYjlFC%2Fo0dw%3D&reserved=0>. The IETF Secretariat -- Best regards, Kathleen _______________________________________________ TLS mailing list TLS@ietf.org<mailto:TLS@ietf.org> https://www.ietf.org/mailman/listinfo/tls<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Ftls&data=02%7C01%7CAndrei.Popov%40microsoft.com%7C30b7cfd6c111409f442b08d5e5bd3777%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636667523215041552&sdata=GkIXrs3zVeUBaEU2EUL8%2FXJdDdkDUlQ70iKr0rDJQRU%3D&reserved=0>
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