full-disclosure - Re: OpenID/Debian PRNG/DNS Cache poisoning advisory

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Date: Fri, 8 Aug 2008 13:47:01 -0500
From: Nicolas Williams <Nicolas.Williams@....com>
To: "Perry E. Metzger" <perry@...rmont.com>
Cc: cryptography@...zdowd.com, Eric Rescorla <ekr@...workresonance.com>,
	Dave Korn <dave.korn@...imi.com>,
	full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	OpenID List <general@...nid.net>, security@...nid.net
Subject: Re: OpenID/Debian PRNG/DNS Cache poisoning
	advisory

On Fri, Aug 08, 2008 at 02:08:37PM -0400, Perry E. Metzger wrote:
> The kerberos style of having credentials expire very quickly is one
> (somewhat less imperfect) way to deal with such things, but it is far
> from perfect and it could not be done for the ad-hoc certificate
> system https: depends on -- the infrastructure for refreshing all the
> world's certs every eight hours doesn't exist, and if it did imagine
> the chaos if it failed for a major CA one fine morning.

The PKIX moral equivalent of Kerberos V tickets would be OCSP Responses.

I understand most current browsers support OCSP.

> One also worries about what will happen in the UI when a certificate
> has been revoked. If it just says "this cert has been revoked,
> continue anyway?" the wrong thing will almost always happen.

No doubt.

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