OpenID/Debian PRNG/DNS Cache poisoning advisory

Ben Laurie benl at
Tue Aug 12 10:42:59 EDT 2008

On Tue, Aug 12, 2008 at 9:55 AM, Clausen, Martin (DK - Copenhagen)
<mclausen at> wrote:
> You could use the SSL Blacklist plugin
> ( for Firefox or heise SSL
> Guardian
> (
> 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.

There are two parties that are vulnerable: the user logging into the
OpenID Provider (OP), and the Relying Party (RP). If the RP
communicates with the OP, then it needs to use TLS and CRLs or OCSP.
Browser plugins do not bail it out.



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