full-disclosure - Re: OpenSSL-Bug still allows MITM, Browser(s) set up badly - Re: Identify weak Debian OpenSSL clientsin SSH DH key exchange

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Message-ID: <20080526.b3e397a6bcfcf214dfd106b4f628bd8e@cynops.de>
Date: Mon, 26 May 2008 15:56:49 +0200
From: Alexander Klink <a.klink@...ops.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: OpenSSL-Bug still allows MITM,
	Browser(s) set up badly - Re: Identify weak Debian OpenSSL
	clientsin SSH DH	key exchange

> > That is indeed a problem. AFAIK IE 7 on Vista now does some CRL
> checking
> > by default, but I haven't tried it yet.
> 
> I did some research on this recently, and the story for browser support
> is actually much more complicated. In addition to CRLs there is a

It is even a bit more complicated - CRL checking can mean two different
things:
  1. check manually downloaded and installed CRLs, which is what Firefox
     1 and 2 will do if you install one. This is different from
  2. download CRLs automatically from the "CRL Distribution Point"
     (CDP), which may be contained in the certificate and check the CRL
     afterwards. Firefox 1 or 2 won't do this for you.

So for a typical user, this
> 	* Firefox 1 and 2 support both OCSP and CRL, but default to
> using CRL. 

boils down to: they do not do any revocation checking.

Cheers,
  Alex
-- 
Dipl.-Math. Alexander Klink | IT-Security Engineer |    a.klink@...ops.de
 mobile: +49 (0)178 2121703 |          Cynops GmbH | http://www.cynops.de
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