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Enhancing digital certificate security

January 3, 2013
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18 comments :

Unknown said...

MSFT is pushing update

Microsoft Security Advisory 2798897

Fraudulent Digital Certificates Could Allow Spoofing

http://technet.microsoft.com/security/advisory/2798897

January 3, 2013 at 1:34 PM
dwoz said...

Its a good example of how the best security pracitces we have still go terribly wrong at times.

Daniel Wozniak

January 3, 2013 at 2:12 PM
The Locksmith said...

Why does plus.google.com use a *.google.com cert? Seems like extremely poor decision by the plus team and Google Online Security to allow use of a domain wild card cert. In fact, why does a *.google.com cert exist? If you think, nothing wrong with the practice then is plus the only product/service to use a wild card cert?

January 3, 2013 at 2:37 PM
Unknown said...

That's why we should finally switch to TLSA RRs, which only make sense with DNSSEC.

If you, fellow readers, administrate a DNS service at your company, get DNSSEC set up. TLSA or CAA afterwards is trivial. Chrome already verifies it, Mozilla has plans to do so (also a nice introduction): https://wiki.mozilla.org/Security/DNSSEC-TLS-details#Embedding_Certificate_Information_in_DNS

January 3, 2013 at 2:39 PM
Anonymous said...

@Sebastian, yes, let's put registrars and NICs in charge instead... no, thanks!

January 3, 2013 at 2:57 PM
Collin said...

The conclusion of the post notes that Google "may also decide to take additional action after further discussion and careful consideration," which to me hints that the Chrome team, as others, are likely considering whether to continue including TURKTRUST root. While I fully appreciate the ramifications of the breach, I would inveigh upon the community to take time to consider subsequent actions. Unfortunately, due to banking embargoes against sanctioned states, there are very few CAs that accept customers from Iran and Syria. TRUSTTRUST and ipsCA (not trusted) are likely the primary CAs for these audiences. Unfortunately if this CA is removed, it is likely that the decision will push many sites into the national, not-trusted and completely compromised CA ParsSign.

January 3, 2013 at 5:33 PM
Schmaltz Herring said...

Diginotar CA is gone after what happened. I hope the same will happen to TURKTRUST.

January 3, 2013 at 9:00 PM
Unknown said...

As a Turkish citizen, I agree that Turktrust should be condemned. However, previously and duly issued certificates should not be revoked, it is not fair for the merchants who may not (and in all likelihood do not) understand what is going on. That said, I'd like to reiterate that I agree with Google's decision.

January 4, 2013 at 3:56 AM
Nephilim said...

@Google: Can you tell us, *how* did you find this out?

January 4, 2013 at 7:12 AM
Tritonio said...

Google should ASAP improve the extensions' API to allow extensions like SSL observatory and Convergence to be created for Chrome. Firefox had the proper API for years and I am really thinking of switching back to Firefox because of Chrome's crippled API.

In other words if you actually care about user privacy, give the users tools to make stuff to protect their privacy as *they* see fit.

January 4, 2013 at 9:41 AM
Paul B said...

Locksmith: Google probably do NOT use a *.google.com certificate.

The issue here is that SOMEONE ELSE managed to create one (and one that was TRUSTED) and use it for a man-in-the-middle attack against Google.

January 4, 2013 at 11:33 AM
Neil Rashbrook said...

@Nephilim My understanding is that Chrome knows who the issuers of the real Google certificates are, so that it can immediately identify a fraudulent certificate.

January 6, 2013 at 7:03 AM
Unknown said...

@Paul B:

Google uses *.google.com certs a lot. With quite a lot of Subject Alternative Names.

An example of *.google.com certs for various hosts collected just by browsing (note that some repeat, they are shared for multiple google services).

Another count from an observatory (those are all unique certs, most of which, if not all, belonging really to google):

select count(id) from ee_certs where subject like '%CN=*.google.com%' and not_after >= '2013-01-01';
count
-------
1188

(Sorry if this is double-posted, the comment system does not make it easy).

January 7, 2013 at 10:55 AM
newsham said...

Please scope the CAs already. I don't need turktrust or any of its intermediaries signing for anything but *.tr!

January 8, 2013 at 5:04 PM
Anonymous said...

so still intermediate CA are issuing such kind of digital certification. If this is happening then how actual digital certificate can be redeem with the parent CA.

January 10, 2013 at 12:44 PM
mdav (IRC) said...

It seems the time is right for DANE (RFC6698), so I hope it will be incorporated in Chrome and other browsers some day soon.

January 31, 2013 at 10:33 AM
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June 20, 2014 at 1:07 AM

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