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Date: Thu, 16 Oct 2014 09:56:06 -0600
From: Kurt Seifried <>
Subject: Re: attacking hsts through ntp

On 16/10/14 06:03 AM, Hanno Böck wrote:
> it's a pretty neat and simple idea:
> Kill HSTS through NTP by sending victims PC into the future.
> Same should work for HPKP. The idea of setting some security feature
> through a header needs a revisit.
> The solution would be to have a more reliable PC time. How do we do
> that?

The obvious solution being to whitelist your site (in the chrome/firefox
source code)if you truly care:

email asking to be added to the whitelist, from the
domain you want white listed (otherwise they tend to ignore it). Usually
within a few business days they'll add it to the source code, and then
in the next browser update they will update the list and you will now be
white listed.

I've done this for my domains, you should too!

Kurt Seifried -- Red Hat -- Product Security -- Cloud
PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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