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Date: Wed, 13 Nov 2013 11:09:10 -0500
From: "Eric H. Christensen" <echriste@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: Microsoft Warns Customers Away From RC4 and SHA-1
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On Wed, Nov 13, 2013 at 07:57:51AM -0800, Tim wrote:
> > I'm inclined to agree. The question I suppose is, like DES (and
> > 3DES/MD5) at what point do we start assigning CVE's for some of this?
> > thoughts and comments welcome.
>
> Using a weak encyption algorithm alone isn't a sufficient condition to
> issue a CVE against software, since often the context of the usage
> matters a lot. If you use MD5 or SHA-1 for password hashing (with
> lots of salt and rounds), then there's no vulnerability. If you use
> them for HMACs, then there's also likely no problem. But if you use
> them for a signature with a public key, there is.
It's answers like this that make it difficult for non-security-literate system administrators to make good decisions. I completely understand and agree with what you wrote but I wonder if we're making it harder for people to understand how to protect themselves.
After having many similar conversations with people that manage systems I find that it's usually easier to say "MD5 bad, SHA-256 good" and then just walk away. Perhaps some sort of chart should be published that allows people to make better decisions?
- -- Eric
- --------------------------------------------------
Eric "Sparks" Christensen
Red Hat, Inc - Product Security Team
sparks@...hat.com - sparks@...oraproject.org
097C 82C3 52DF C64A 50C2 E3A3 8076 ABDE 024B B3D1
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