> It's fortunate that the steps required here aren't particularly complicated for the devices you can update, and the advice essentially boils down to 'update them'. The problem is the devices you can't update or update easily.
> Update everything that ships a CA bundle: your OS ca-certificates package, certifi, Node, Homebrew, and rebuild your container images once the base images pick up the change.
> Devices you can't update are the hard part. Routers, printers, TVs, appliances with frozen firmware will trust these certificates until expiry, which is July 2039...
Quick -- we need to MITM all the smart TVs so they can be jailbroken in one fell swoop!
> > Devices you can't update are the hard part. Routers, printers, TVs, appliances with frozen firmware will trust these certificates until expiry, which is July 2039...
The interesting question is, how many of these devices will have the compromised CA root certificate in place?
Oh and another thing is problematic, many a Java app ships with its own keystore.jks if it needs to trust some privately hosted endpoint, and that keystore.jks may or may not contain the compromised CA root certificate... updating the OS will not catch this kind of stuff.
Make dns secure and put certs / public keys in dns. Control over dns already gives you the right to get tls certs. It should just be connected directly. We don’t need CAs.
That still requires trust stores to be distributed to the clients and some clients don't need that baggage on the dns. Also, dns is by default insecure, dnssec is a configuration nightmare
> That still requires trust stores to be distributed to the clients
There's no such thing as a "trust store" in practice. To be "trusted" you just need to demonstrate you have control over a DNS TXT record, and we don't need a special "store" or intermediary for that.
Certificate authorities are an artifact of a bygone time and an entirely different model of internet infrastructure.
DNSSEC deployment has been anything but trivial. This APNIC post from 2024 estimated that about 1% of DNS queries were being validated via DNSSEC: https://blog.apnic.net/2024/05/28/calling-time-on-dnssec/. That's more than 25 years after the IETF first standardized DNSSEC.
The first time you go to the bank, you do the "trust exchange" (maybe scanning a QR? People sure love that) that verifies future connections, similar to how you acquire digital certificates today when you deal with the government online and similar.
Edit: > Every time you access your bank on different devices normalizes it so that visiting a typo domain would show the dialog and many would just click through.
Show the dialog? What dialog? There is no dialogues here, you cannot login to the bank unless you've verified the connection. You do it with your phone, then you can propagate the trust from there to other devices if needed.
Not all banks have physical locations, not everyone has the ability to get to the ones which do.
You can't walk back from the existing expectation and ease of use we have today. It's just not going to happen, people will opt for the current path because it's easy and seems good enough to them.
Most normal people don't even know this whole thing is going on. They don't know the difference between http and https other than "it's secure".
If we want to improve on this, it has to come with the current level of ease of use at a minimum.
Every time you access your bank on different devices normalizes it so that visiting a typo domain would show the dialog and many would just click through.
Two more things to note about impact assessment: Flatpak uses the selected runtime's baked-in trust store (I think), so any apps may be susceptible even if you update the system package. Containers also don't inherit the host's trust store and use the one from the base image.
I wonder how someone stumbled upon this - maybe leaked by someone inside eMudhra?
Since there's nothing to indicate that the private key was all zeroes and one non-zero lsbyte, and presumably nobody would try to brute-force a private key.
Of the thousands of people bored with a swarm of AI agents, is it not plausible that somebody would just say "hey, let's do a vibe check to see whether any CAs are trivially crackable"?
Just seems weird for anyone to focus on trying to crack private keys starting with absurd 8-bit values that "nobody would use for a private key", let alone bother to do it at all, given the search space.
I would not expect anyone to be on the lookout continuously, but like the researcher doing a "yolo" and trying. There are enough people out there that it is likely to happen at least once in a while. Or for instance someone looking for a firmware exploit in a downstream device.
The CA concept itself is flawed, unless normal users were able to cherry pick the CA they do trust, dream. And even with that, they must keep in mind that many authorities and/or mafias have very probably rogue certificates for browser invisible man-in-the-middle.
I will say, there’s something almost reassuring when something goes boom that badly and the story is really silly. It’s like [horrific human-caused disaster] but it’s because of a Three Stooges episode.
I think the way that the bits are counted is based on the pool from which the number was randomly drawn. So it's possible they had 256 bits of entropy but got really unlucky.
It reads okay to me too, yet Pangram says it's mixed - the "What a private key actually is" section is AI, so is 'Why "it cannot be contained"' and some others.
I think it's a hybrid text. The section about how elliptic curve keys work is particularly aggravating. Unfortunately it's also the only section that gave me new information.
- A sequence number being accidentally used as the private key or
- The private key being generated securely but then accidentally truncated to 8 bits (e.g. writing a single char into a zeroed buffer when you should've memcpy'd from a char*).
The sequence number idea is supported by the fact that two of the G3B private keys are consecutive numbers. I ran a quick Monte Carlo simulation and if I got it right, sampling 8 keys from [0,255] uniformly at random (as in the truncation scenario), you'd expect them to contain 2 consecutive numbers only about 18% of the time.
Oh wow, that is even more damning. Only 146 out of the possible 256 keys have this property. You only have about a 1% chance to get that 8 times in a row (A little more than 1% if sampling with replacement and a little less if sampling without. You'd expect them to at least not use the exact same key twice but at this point???).
The fact that there are more than the "4" one, and all the low numbers are below 384 (384 being the bits for private key) makes me think whoever was creating these thought "Oh a random number between 1-384" let me choose... 4! (156, 230, 115, 56, 66, 237, 155)...
The probability of getting a 0 is the same for every digit. However, in my opinion, the probability of getting a number that starts with two zeros is 1/10 * 1/10, and the probability of getting a number that starts with the same two digits is 10 * 1/10 * 1/10.
But the probability to receive one number or the other are the same.
Yeah, but if you are the one issuing the CA's private key, you already, by definition, have the keys to that CA. You don't need to make stupid keys in that scenario
But it doesn't make sense. Sure they'd find it extremely useful to have the key, but it doesn't need to be a weak key for it to be useful. If anything, it makes it less useful to them.
If I'm going to ask you or force you to share your password with me, there's no reason I'd ask you to set the password to 4. We might as well agree that the password would be D#!(s9fj0jalk!4af095SF42 , and it's much more likely our collaboration will continue working for years.
"Never attribute to malice that which is adequately explained by stupidity"
As far as I know, to become a CA, with the requirements and ceremonies involved, this type of mistake must never happen. Assuming malice instead of ignorance is reasonable here. The entire premise of a CA, is trust.
Crypto nerds: "we need to worry about post quantum crypto! we need to worry about AI breaking foundational math that we use for cryptography! make new cryptographic algorithms yesterday"
This is not a good write-up. Yesterday's discussion did contain better data, less self-Promotion and actually asked why it happened, instead of just saying "number small".
Kind of hard to understand how a bug would have generated a second pair of key so bad, and how would human would have ended up using them. Never attribute to malice what can be attributed to stupidity, but sometimes you wonder.
And an equal amount of stupidity in the whole ecosystem, apparently there are no "unit-tests" for trivial failure modes, like 8 bits of entropy, before adding a CA to the trusted list.
What next, googling the public key finds a 2 year old pastebin with the private key?
I'm still flabergasted the HSM allowed this key to be generated. Then again, I've worked with HSMs, there are always many mistakes in the firmware, usually less severe though.
It seems there was some issue with the ceremony with some wrapping/unwrapping scripts.
They explicitly said they wanted to export the keys from the HSM; the keys were intended for USA/Europe (for sovereignty reasons) but were never actually used.
It seems the HSM itself worked, their ceremony around wrapping/unwrapping didn't.
Yes, but there was no TLS cert issued that had these intermediate certs in its chain of trust at all anywhere. So why are they a CA if they don't issue any certs?
> Update everything that ships a CA bundle: your OS ca-certificates package, certifi, Node, Homebrew, and rebuild your container images once the base images pick up the change.
> Devices you can't update are the hard part. Routers, printers, TVs, appliances with frozen firmware will trust these certificates until expiry, which is July 2039...
Quick -- we need to MITM all the smart TVs so they can be jailbroken in one fell swoop!
The interesting question is, how many of these devices will have the compromised CA root certificate in place?
Oh and another thing is problematic, many a Java app ships with its own keystore.jks if it needs to trust some privately hosted endpoint, and that keystore.jks may or may not contain the compromised CA root certificate... updating the OS will not catch this kind of stuff.
So you create more surface area for vulnerability? We might already be at or close to the sweet spot. Security is hard.
I mean specifically for the use case of the browser warning the user if there is a MITM between them and e.g. their bank.
I genuinely can't say I secured a PC, when it needs to phone home for a configuration at this point.
We are most likely over the line for needing to airgap a personal PC.
There's no such thing as a "trust store" in practice. To be "trusted" you just need to demonstrate you have control over a DNS TXT record, and we don't need a special "store" or intermediary for that.
Certificate authorities are an artifact of a bygone time and an entirely different model of internet infrastructure.
(Half joking).
Edit: > Every time you access your bank on different devices normalizes it so that visiting a typo domain would show the dialog and many would just click through.
Show the dialog? What dialog? There is no dialogues here, you cannot login to the bank unless you've verified the connection. You do it with your phone, then you can propagate the trust from there to other devices if needed.
You can't walk back from the existing expectation and ease of use we have today. It's just not going to happen, people will opt for the current path because it's easy and seems good enough to them.
Most normal people don't even know this whole thing is going on. They don't know the difference between http and https other than "it's secure".
If we want to improve on this, it has to come with the current level of ease of use at a minimum.
Why wasn't this second spend by the parties accepting those certificates as valid before they were accepted?
“eMudhra intermediate CA compromise” | 947 points | 19 hours ago | 408 comments
There are two hard problems in computer science: naming things, cache invalidation, and off-by-one errors.
https://xkcd.com/221
Since there's nothing to indicate that the private key was all zeroes and one non-zero lsbyte, and presumably nobody would try to brute-force a private key.
Why not? There are examples of RNGs providing very poor entropy which might be a reason to check it (looking at you Sony).
8 bits is crazytalk!
Silly 2-bit outfit.
Maybe it's 3 bits.
hey chatgbg what is a “private key”
A private key is a tiny number you don't need to share publicly because it is easy enough to guess.
- A sequence number being accidentally used as the private key or
- The private key being generated securely but then accidentally truncated to 8 bits (e.g. writing a single char into a zeroed buffer when you should've memcpy'd from a char*).
The sequence number idea is supported by the fact that two of the G3B private keys are consecutive numbers. I ran a quick Monte Carlo simulation and if I got it right, sampling 8 keys from [0,255] uniformly at random (as in the truncation scenario), you'd expect them to contain 2 consecutive numbers only about 18% of the time.
https://xkcd.com/221/
No one is going to suspect `98761316832165974216498789746` is anything other than random. But `000000000000000123` looks suspicious.
But the probability to receive one number or the other are the same.
smaller than 384 means 384 numbers (including 0) divided by the amount of possible numbers (see above) imho
If it was deliberate, one would use keys that only the person abusing it has. Not keys everyone can guess if they get a hint.
Here, you didn't leak anything, you just fucked up.
If I'm going to ask you or force you to share your password with me, there's no reason I'd ask you to set the password to 4. We might as well agree that the password would be D#!(s9fj0jalk!4af095SF42 , and it's much more likely our collaboration will continue working for years.
"Never attribute to malice that which is adequately explained by stupidity"
some random CA: "lol. 4."
Kind of hard to understand how a bug would have generated a second pair of key so bad, and how would human would have ended up using them. Never attribute to malice what can be attributed to stupidity, but sometimes you wonder.
What next, googling the public key finds a 2 year old pastebin with the private key?
Don't they even test script changes on a staging server? How could there be such a script error in production that was not caught in testing/staging?
This sounds very like a fundamental organization error, not an innocent whoopsie. It should lead to a permanent ban of the organization.
They explicitly said they wanted to export the keys from the HSM; the keys were intended for USA/Europe (for sovereignty reasons) but were never actually used.
It seems the HSM itself worked, their ceremony around wrapping/unwrapping didn't.
Why are browsers trusting CAs which issued zero certificates since their creation 1 year ago?