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Re: [TLS] A new TLS version negotiation mechanism

Yuhong Bao <yuhongbao_386@hotmail.com> Thu, 12 March 2015 08:25 UTC

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From: Yuhong Bao <yuhongbao_386@hotmail.com>
To: "mrex@sap.com" <mrex@sap.com>, Dave Garrett <davemgarrett@gmail.com>, "maray@microsoft.com" <maray@microsoft.com>, "andrei.popov@microsoft.com" <andrei.popov@microsoft.com>
Date: Thu, 12 Mar 2015 01:25:32 -0700
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Cc: Stephen Checkoway <s@pahtak.org>, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] A new TLS version negotiation mechanism
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> Dave Garrett wrote:
>>
>> The primary source of TLS version intolerance is the small portion of
>> the Internet running junk they haven't upgraded in a decade and a half.
>
> Just FYI, all Servers that are running Microsoft Windows 2008R2, 2012& 2012R2
> and have TLSv1.2 enabled, are de-facto version-intolerant to TLSv1.2
> They will abort the connection when receiving an extension-less
> ClientHello with ClientHello.client_version = (3,3), while the handshake
> will succeed with ClientHello.client_version = (3,2) or when the
> server has TLSv1.2 disabled (the latter is the default for Win7/2008R2).

As a side note, does the March updates includes any fixes to SChannel other than FREAK and the Cisco OneConnect bug?

Yuhong Bao

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