RE: OpenID/Debian PRNG/DNS Cache poisoning advisory



You could use the SSL Blacklist plugin
(http://codefromthe70s.org/sslblacklist.asp) for Firefox or heise SSL
Guardian
(http://www.heise-online.co.uk/security/Heise-SSL-Guardian--/features/11
1039/) for IE to do this. If presented with a Debian key the show a
warning.

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

~martin

-----Original Message-----
From: owner-cryptography@xxxxxxxxxxxx
[mailto:owner-cryptography@xxxxxxxxxxxx] On Behalf Of Eric Rescorla
Sent: 8. august 2008 17:06
To: Ben Laurie
Cc: bugtraq@xxxxxxxxxxxxxxxxx; security@xxxxxxxxxx; OpenID List;
cryptography@xxxxxxxxxxxx; full-disclosure@xxxxxxxxxxxxxxxxx
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?

-Ekr

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