full-disclosure-uk August 2008 archive
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full-disclosure-uk: Re: [Full-disclosure] [OpenID] OpenID/Debian

Re: [Full-disclosure] [OpenID] OpenID/Debian PRNG/DNS Cache poisoning advisory

From: Eddy Nigg (StartCom Ltd.) <eddy_nigg_at_nospam>
Date: Fri Aug 08 2008 - 11:44:56 GMT
To: Ben Laurie <benl@google.com>

Ben Laurie:
> Security Advisory (08-AUG-2008) (CVE-2008-3280)
> ===============================================
> Ben Laurie of Google's Applied Security team, while working with an
> external researcher, Dr. Richard Clayton of the Computer Laboratory,
> Cambridge University, found that various OpenID Providers (OPs) had
> TLS Server Certificates that used weak keys, as a result of the Debian
> Predictable Random Number Generator (CVE-2008-0166).
> In combination with the DNS Cache Poisoning issue (CVE-2008-1447) and
> the fact that almost all SSL/TLS implementations do not consult CRLs
> (currently an untracked issue), this means that it is impossible to
> rely on these OPs.

This affects any web site and service provider of various natures. It's not exclusive for OpenID nor for any other protocol / standard / service! It may affect an OpenID provider if it uses a compromised key in combination with unpatched DNS servers. I don't understand why OpenID is singled out, since it can potentially affect any web site including Google's various services (if Google would have used Debian systems to create their private keys).

Regards Signer: Eddy Nigg, StartCom Ltd. <http://www.startcom.org> Jabber: startcom@startcom.org <xmpp:startcom@startcom.org> Blog: Join the Revolution! <http://blog.startcom.org> Phone: +1.213.341.0390

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