RE: OpenID/Debian PRNG/DNS Cache poisoning advisory

From: Clausen, Martin (DK - Copenhagen) <>
To: Eric Rescorla <>,Ben Laurie <>
Cc:,,OpenID List <>,,
Subject: RE: OpenID/Debian PRNG/DNS Cache poisoning advisory

You could use the SSL Blacklist plugin
( for Firefox or heise SSL
1039/) for IE to do this. If presented with a Debian key the show a

The blacklists are implemented using either a traditional blacklist
(text file) or distributed using DNS.


-----Original Message-----
[] On Behalf Of Eric Rescorla
Sent: 8. august 2008 17:06
To: Ben Laurie
Cc:;; OpenID List;;
Subject: Re: OpenID/Debian PRNG/DNS Cache poisoning advisory

At Fri, 8 Aug 2008 11:50:59 +0100,
Ben Laurie wrote:
> However, since the CRLs will almost certainly not be checked, this 
> means the site will still be vulnerable to attack for the lifetime of 
> the certificate (and perhaps beyond, depending on user behaviour). 
> Note that shutting down the site DOES NOT prevent the attack.
> Therefore mitigation falls to other parties.
> 1. Browsers must check CRLs by default.

Isn't this a good argument for blacklisting the keys on the client side?


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