Chinese Certificate Authority CNNIC Is Dropped From Google Products

eldavojohn writes A couple weeks ago, Google contacted the CNNIC (China's CA) to alert them of a problem regarding the delegated power of issuing fraudulent certificates for domains (in fact this came to light after fraudulent certificates were issued for Google's domains). Following this, Google decided to remove the CNNIC Root and EV CA as trusted CAs in its Chrome browser and all Google products. Today, the CNNIC responded to Google: "1. The decision that Google has made is unacceptable and unintelligible to CNNIC, and meanwhile CNNIC sincerely urge that Google would take users' rights and interests into full consideration. 2. For the users that CNNIC has already issued the certificates to, we guarantee that your lawful rights and interests will not be affected." Mozilla is waiting to formulate a plan.

Comments

Good. +1 for Google.

[Anonymous Coward]

If a CA clearly can't be trusted, then it has absolutely no business being trusted. This is a good thing, and despite the upheaval it will cause for people requiring new certs (if you want chrome to like the site), it will only improve security by making CA's aware that if they mess about, or don't vet properly, then their business is basically gone.

Of course, the only really secure way is to drop all CA's everywhere, and directly exchange certs with whoever you deal with (banks, etc, etc by going into a branch. Hugely impractical though).

Re:Good. +1 for Google.

[Dutch Gun]

The fact that ANY root CA can issue Google domain certificate (or whatever domain they want) is bonkers. Nowadays, there are simply too many root CAs to be able to trust them all, if we ever really could. There used to be just a handful. Have you looked at your local CA store? There's hundreds of them nowadays! Did you know the Hong Kong Post Office is a root CA (Hongkong Post Root CA 1)? Doesn't that make you feel warm, fuzzy, and secure, knowing that the fine folks at that establishment could issue a fraudulent certificate for any website in the world?

This system needs to be fixed, or at least seriously updated. It just hasn't scaled well in the reality of today's world. I don't think we need to go to the extreme of exchanging private certs. Let's face it, that will never, ever happen anyhow. But we do need more assurances than we have now.

Re:Good. +1 for Google.

[Richard_at_work]

So, with the third party out of the equation, how does one know that the security certificate you receive from random-site.com is the one that random-site.com intended you to receive? This is where going to two entity encryption fails, because the web has no inbuilt ability to verify the communication with the website is as secure as intended without going to a third party.

Just allowing self signed certs won't solve anything, because most people who use the web won't bother with any independent verification (which you would have to do offline or on a different internet connection for it to mean anything anyway) - fuck, do you remember how long it took to beat "look for the padlock symbol" into people in the first place? All it will do is what people have been bitching about for similar other approaches for years now - people will get so many pop ups, they will stop caring and just click OK.

The CA system isn't the best solution in the world, but its better than most suggestions, including allowing self signed certs for general communication.

Re:Good. +1 for Google.

[mlts]

This is why so many variants of adware that sneak their certs into the root CA list and then create a local loopback proxy is so common -- nobody looks at what key is presented. If the lock icon is green... good enough.

Re:Good. +1 for Google.

[IamTheRealMike]

WoT doesn't work anywhere. I know it's a popular idea but it doesn't work, period, end of story.

Problem: the PGP web of trust is tiny and has fewer than 4 million keys published to the SKS key pool, EVER. That's pathetic. But of those keys, many are not really connected to the WoT at all. The strong set is only 50k keys. The WoT is a failure, numerically. For comparison: "Yo", an app created as an April fools joke which only lets you send the word "yo" to other users, managed to get 3 million users. The WoT's entire existence has been matched by an April fools.

Problem: the PGP web of trust converts everyone you trust a CA. Unlike real CAs that protect their keys with hardware security modules, are audited, etc, PGP users routinely do things like carrying their private keys through airports on general purpose laptops onto which they install whatever the latest cool toy is. If any of the users you trust are compromised, the entire WoT can be faked through them and your client will accept it. Sure, if you're some kind of crypto guru you can maybe detect this. But most people aren't.

Problem: the "web of trust" is misleadingly named. The graph edges in it are not indicative of social trust. They are in fact reflecting a trust that is more like, "I trust you to protect your private key and do accurate ID verification" which has nothing to do with the more ordinary, human, every day use of the word trust. In your post you mix up these very different kinds of trust, and this is a very frequent but fundamental error. Protecting private keys and doing accurate ID verification are difficult, skilled tasks, whereas what being trustworthy usually means simply requires loyalty.

Problem: the primary criticism of the CA system is that CA's could be coerced by governments via legal means. However the same is true for people in the web of trust - any of those people can be served with a a court order forcing them to sign the governments key.

Problem: the WoT leaks the entire social graph to the entire public. In this day and age, that's unacceptable.

Problem: the WoT has fake keys uploaded to it and there's nothing anyone can do about it. This isn't theoretical, it has happened and routinely fools large numbers of people.

In short, after many years I've come to the conclusion that the web of trust has no redeeming qualities at all. It was a neat sounding idea, it was tried, it has failed. It should be taken out the back and quietly shot, so it can't mislead any more people into thinking it's a good idea.

Too bad for CNNIC

[Anonymous Coward]

Given the events that transpired, it seems like Google is completely in the right here. It would be best if Mozilla, Microsoft, et. al. followed suit.

Re:Too bad for CNNIC

[QuietLagoon]

All that will happen is ...

If that is what happens, then other measures would need to be taken to assure new CA's are trustworthy.

.
If the same problem continues to recur and nothing is done to prevent it, then the whole web of trust will fail.

Re:Too bad for CNNIC

[Zocalo]

It's not quite that simple. CNNIC is the Chinese national equivalent of a LIR - they are responsible for all the IP assignments in China, so they can hardly "disappear" like that. Shutting down their CA division and re-opening it as a new shell company might be an option however.

The main thing here is that this also invalidates all of the certificates issued by CNNIC's intermediaries like MCS that are decended from the soon to be invalidated root certificates, and so on all the way down the chain of trust. That's a *lot* of customers and customers of customers that are going to be looking to push at least some of the costs of sorting this out upstream. Ultimately the buck stops at CNNIC, so they are going to have to make a decision about how much of that costs they are going to bear - get it wrong and there are plenty of other root CAs that intermediate level CAs can go to instead of CNNIC.

That sends a pretty strong message to other CAs that might be considering something similar, or to governments looking to strong arm a CA into doing it on their behalf. Break the chain of trust (whether through imcompetence, negligence or deliberate intent being immaterial), and you can expect to face very public, and potentially very expensive, consequences. Given that this also has implications for everyone's privacy, absolutely Apple, Microsoft, Mozilla et. al ought to follow suit and take at least some form of punitive action. Following on from DigiNotar I'm actually expecting to see them publishing some form of formalised policies about this in the near future, and hopefully no more exceptions (like TrustWave) are going to be made.

Re:Too bad for CNNIC

[Zocalo]

That's the big question, isn't it? Like CNNIC, the Turkish DigiNotar got the boot also, yet the US-based TrustWave was let off. It's probably worth pointing out that TrustWave's problems occurred pre-Snowden so people were a little more complacent even before you consider the "local US company" vs. "country with poor reputation for civil rights" issues. I'd like to hope that in today's climate TrustWave would meet a similar fate to DigiNotar and CNNIC/MCS, but without a clear no-exceptions policy from the application and OS vendors there's no real way to be sure. Even if there were such a policy, I doubt anyone would be willing to unilaterally revoke a compromised root certificate from one of the *really* major players in the CA game without a mutually agreed grace period to migrate users to replacement certificates.

Important note: this is potentially not permanent

[kav2k]

What this summary neglects to say is that Google is open to the idea of adding them back. Quote (link mine):

[...] CNNIC will be working to prevent any future incidents. CNNIC will implement Certificate Transparency for all of their certificates prior to any request for reinclusion. We applaud CNNIC on their proactive steps, and welcome them to reapply once suitable technical and procedural controls are in place.

Link to the announcement

[YA_Python_dev]

Google announced the decision in an update at the bottom of https://googleonlinesecurity.blogspot.com/2015/03/maintaining-digital-certificate-security.html. I'm happy they did: certification authorities need to understand that there are consequences to gross negligence or worse.

Re:Firefox response

[Lennie]

Here is a link to the latest Mozilla statement on the mailinglist/newsgroup:
https://groups.google.com/d/ms...

Re:Important note: this is potentially not permane

[ledow]

"Fix your shit once-and-for-all and we might deal with you again."

That's not really an endorsement, any way you look at it.

Web of trust cannot survive politics

[sinij]

Web of trust cannot survive politics, if we tolerate any bad behavior from any trusted parties, then nobody could be trusted and whole construct falls apart.

Re:Lawful rights and interests?

[gstoddart]

Ever read any other press releases coming out of China?

They very often miss the point, and just fall back to "this is true because we say it is".

The "rights and interests" of users is to not be spoofed. The users in China don't have a "right" to use a google product which has been hacked, and the CNNIC doesn't have a "right" to issue fake certificates.

Some of it is swagger, but from people who are used to being able to wave their collective dicks around and have that influence reality. Now, they've come up against an entity who says "we simply don't care what you want to claim, this is what's happening".

Re:Mozilla formulating a plan?

[Anonymous Coward]

You know you can do this yourself in Firefox and Thunderbird.

Options -> Advanced -> Certificates -> View Certificates -> Authorities -> Delete or Distrust...

Re:Internet Explorer

[Zocalo]

Microsoft have decided that the buck stops with MCS Holdings and will be revoking all of their certificates, but letting CNNIC and their other customers off the hook. I suspect the update will go out as part of the regular patch batch on April 14th.

No excuses

[ZorinLynx]

This is kind of equivalent to hiring a locksmith, then noticing that he copied one of your keys and it's on his personal keychain.

There is no reason to ever trust this locksmith again. Some institutions, like certificate authorities and locksmiths, are sacred. The whole POINT of their existence is to be an entity you can trust to keep things secure. If they are irresponsible and let this happen, then there's no reason to trust them.

Ever again.

Re:Firefox response

[drinkypoo]

Now that is fascinating. FTFN[ewspost]:

The current incident falls into this category:
"Problem: CA mis-issued a small number of intermediate certificates that they can enumerate

Uh, no. No, that is not the problem. The problem is that the CA has been demonstrated to use untrustworthy practices. They are fundamentally untrustworthy, and Google did the Only Right Thing(tm) while Mozilla is failing, and hard.