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Re: [TLS] Renego Indication RI patch interaction with TLS major version interop

Michael D'Errico <mike-list@pobox.com> Tue, 15 June 2010 17:06 UTC

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Date: Tue, 15 Jun 2010 10:06:06 -0700
From: Michael D'Errico <mike-list@pobox.com>
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To: Marsh Ray <marsh@extendedsubset.com>
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Subject: Re: [TLS] Renego Indication RI patch interaction with TLS major version interop
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There is an even bigger problem.  Both www.microsoft.com and www.ibm.com
abort an attempt at connecting to them using TLS 1.2 or even 1.1!  I have
not done more extensive testing to see how much of the Internet suffers
from this, but if these "big guys" can't get it right....

   ./TlsTest
   > tls12
   > www.microsoft.com
   TLS negotiation failed: TLS version mismatch
   > tls11
   > www.microsoft.com
   TLS negotiation failed: TLS version mismatch
   > tls10
   > www.microsoft.com
   Domain name match
   Finished message approved
   > tls12
   > www.ibm.com
   TLS negotiation failed: TLS version mismatch
   > tls11
   > www.ibm.com
   TLS negotiation failed: TLS version mismatch
   > tls10
   > www.ibm.com
   Domain name match
   Finished message approved
   > quit

A "version mismatch" error implies a protocol_version alert was received.

Mike



Marsh Ray wrote:
> WTF?
> 
> Article from Yngve:
> http://my.opera.com/yngve/blog/2010/06/02/renego-patched-servers-a-long-term-interoperability-time-bomb-brewing
> 
> http://www.links.org/?p=943
> 
> I haven't finished reading the full article yet, but I thought others
> would be interested:
>> In the past few weeks, as many as 80-90% of the newly patched servers
>> have refused to negotiate with our tester (the TLS Prober) when it
>> claimed to support the hypothetical v4.1 TLS protocol version (or, as
>> I call it, "TLS NG"). This is much higher than the 69% of all servers
>> that generally exhibit the same problem.
> 
> - Marsh

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