Re: [TLS] Another IRINA bug in TLS

Hubert Kario <hkario@redhat.com> Mon, 25 May 2015 12:02 UTC

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From: Hubert Kario <hkario@redhat.com>
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Date: Mon, 25 May 2015 14:02:40 +0200
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Subject: Re: [TLS] Another IRINA bug in TLS
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On Saturday 23 May 2015 12:16:09 Kurt Roeckx wrote:
> On Thu, May 21, 2015 at 12:10:07PM +0200, Yngve N. Pettersen wrote:
> > On Thu, 21 May 2015 12:02:19 +0200, Peter Gutmann
> > 
> > <pgut001@cs.auckland.ac.nz>; wrote:
> > >Santiago Zanella-Beguelin <santiago@microsoft.com>; writes:
> > >>We did find many HTTPS servers supporting
> > >>TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA.
> > >
> > >Just to make sure that's not a typo, you're saying you *did* (not didn't)
> > >find
> > >many servers supporting 40-bit DES as a cipher?  Wow.  How many
> > >approximately,
> > >are we talking tens, thousands, millions?
> > 
> > For reference, in my 530K sample (Biased towards Alexa top million sites)
> > there are 60000 servers (11.38%) that have that specific cipher suite
> > enabled, as of Monday this week.
> 
> Hubert Kario's latest results on
> https://securitypitfalls.wordpress.com/2015/03/29/march-2015-scan-results/
> show:
> EXP-EDH-RSA-DES-CBC-SHA 22110     4.5043%

hmm, that is a bit big difference...

If I ignore the "trust" bit in results I'm still getting just:
EXP-EDH-RSA-DES-CBC-SHA 41804     6.2565

From 668168 sample.

But then there is something which matches rather well the percentage:
EDH-RSA-DES-CBC-SHA     75939     11.3653
(note the lack of "EXP-")
-- 
Regards,
Hubert Kario
Quality Engineer, QE BaseOS Security team
Web: www.cz.redhat.com
Red Hat Czech s.r.o., Purky┼łova 99/71, 612 45, Brno, Czech Republic