OSEC

Neohapsis is currently accepting applications for employment. For more information, please visit our website www.neohapsis.com or email hr@neohapsis.com
Re: [Full-disclosure] OpenID/Debian PRNG/DNS Cache poisoning advisory

From: Ben Laurie (benlgoogle.com)
Date: Tue Aug 12 2008 - 09:42:59 CDT

On Tue, Aug 12, 2008 at 9:55 AM, Clausen, Martin (DK - Copenhagen)
<mclausendeloitte.dk> wrote:
> 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.

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.

Cheers,

Ben.

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/