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The Dropbox hack is real

troyhunt.com

211–220 of 557 posts

Re: The Dropbox hack is real

#211

Earlier quoted context omitted.

That wouldn't really be a proper salt, although technically it would fulfil the purpose of a salt, which is to prevent lookup tables being used.

Oh I agree, but I've seen too many "clever" systems which derive the salt from something like the username or another field or fields in the DB. Just because there is no obvious salt now doesn't mean it's not there. Only Dropbox knows how it worked at this point.

We will have to wait for a code leak ;-)

Re: The Dropbox hack is real

#212
post #40
post #26

It was pretty obvious the dropbox hack was real several years ago, because lots of spam mail started arriving at my dropbox-unique email almost immediately after the breach. I changed my email to another unique address quickly back then. Unique-per-service email addresses work pretty well as a canary for breaches. Just make sure there is more uniqueness than just the service name to such addresses, or someone could s…

I cannot agree more, I do the same, and invite everyone else to do so. - Useful as a canary of which website has been breached - Useful as a canary of which website sold your details - and if your details are in the wild, you can stop the spam by deleting the address Credit cards should work the same way: a unique authorization code specific to this vendor or this transaction and useless to any other actor.

Is there a service (email host) that can give you "infinite email aliases"?

(Yes, I know about the '+' in gmail, but I suspect the word is out on it)

Re: The Dropbox hack is real

#213
post #26

It was pretty obvious the dropbox hack was real several years ago, because lots of spam mail started arriving at my dropbox-unique email almost immediately after the breach. I changed my email to another unique address quickly back then. Unique-per-service email addresses work pretty well as a canary for breaches. Just make sure there is more uniqueness than just the service name to such addresses, or someone could s…

I do the unique address thing, but I also have another system for giving out temporary email addresses. If I want to hand an email address which I know should not receive email after say, this Saturday, I'll just give them "2016-09-03@tmp.grepular.com" - I don't have to do anything to set that up, it will accept mail as long as the date isn't after 3rd September 2016. I blogged it up a while ago here:

https://grepular.com/Automatically_Expiring_Email_Addresses

Re: The Dropbox hack is real

#214
post #26

It was pretty obvious the dropbox hack was real several years ago, because lots of spam mail started arriving at my dropbox-unique email almost immediately after the breach. I changed my email to another unique address quickly back then. Unique-per-service email addresses work pretty well as a canary for breaches. Just make sure there is more uniqueness than just the service name to such addresses, or someone could s…

I do the unique address thing, but I also have another system for giving out temporary email addresses. If I want to hand an email address which I know should not receive email after say, this Saturday, I'll just give them "2016-09-03@tmp.grepular.com" - I don't have to do anything to set that up, it will accept mail as long as the date isn't after 3rd September 2016. I blogged it up a while ago here: https://grepula…

Interesting. I've been considering doing this but, frankly, have been too lazy to implement it. But if you are using a password manager anyway, what's one more field?

Re: The Dropbox hack is real

#215
post #203

> As for Dropbox, they seem to have handled this really well. I'm biased, but I can't agree with this. From what I can tell, there are two communications from Dropbox -- one in 2012 [1] and one last week [2]. In 2012 they did not disclose that hashes were stolen, so I don't see how it's really relevant. In the latest communication, they don't actually explain the risk to the user. They say it is "purely as a preventa…

> > As for Dropbox, they seem to have handled this really well.

> I'm biased, but I can't agree with this. From what I can tell, there are two communications from Dropbox -- one in 2012 [1] and one last week [2].

Especially given that 2012 they assured me that no credentials were lost and this time they didn't even inform me since my account was deleted in the mean time. So it's more or less luck that I know that my old password was compromised.

Re: The Dropbox hack is real

#216
post #180

Earlier quoted context omitted.

I really dislike password managers and there's good news: you don't need one to have unique password per site. A good password algorithm is very useful: http://penguindreams.org/blog/my-accounts-been-hacked-no-it-... The article is dated. I'd suggest a longer minimum and 2 factor for services that support it. The advantage is unique passwords that you don't have to look up.

I used to do this before switching to a password manager; the problem with pattern-based passwords is that while in paper it sounds better than password reuse (unique passwords for each site/service while still being able to remember them, yay!) in practice you are still using the same pattern for all of them. A potential smart adversary could figure out the pattern used and then apply it to every site/service much l…

Right. But the idea does take advantage of the fact that some kinds of patterns are more obvious to humans and some to machines. Most people's threat model is a massive data breach rather than a determined single attacker focused on them who actually uses a smart human brain to analyze the passwords.

Re: The Dropbox hack is real

#217

Earlier quoted context omitted.

While an offline password manager is inherently more secure, at some point you're either going to have to store the database on a cloud somewhere or worry about constantly keeping your databases in sync. Whether you store it in Dropbox/OneDrive/Google/etc. or use LastPass or another service, there's always going to be some risk. At present I still recommend LastPass because that way you can easily have everything syn…

I just sync my 1Password via WiFi between my phone, work computer and personal computer. It's really not that much work either. Well worth keeping the vault of the internet.

What tools do you use for syncing the files? Thanks.

Re: The Dropbox hack is real

#218
post #158

Earlier quoted context omitted.

With Google Mail (and Apps) anything after a + in the first part of the address is ignored, so foo+dropbox@gmail.com would be routed to foo@gmail.com. That's the easiest way to do it that I know of. No need for managing separate aliases.

Whilst great info, unfortunately most of the sites that one would actually try to use this on don't accept addresses containing a "+" as valid. Another Google Mail trick is to use periods. Not as useful as the +, but for those sites that don't accept +, one can usually add in a few extra periods to place sites into buckets (multiple adjacent periods don't work). m.y.e.m.a.i.l@example.com

Unfortunately vendor sites such as apple.com don't realize xy@g and x.y@g are equivalent and will let people register both. If you accidentally click approve on the confirmation email then good luck getting Apple to remove the second account. Which is how my wife gets tons of email from Apple about a stranger's iTunes purchases along with other random items.

Re: The Dropbox hack is real

#219

Earlier quoted context omitted.

I'm pretty sure they do know a `+` is allowed...

I've had sites reject an email containing +.

The trouble is that no one actually implements the email standard from the IETF RFC documents. In fact, some people[0] even actively discourage doing so, despite there being little in the way of good reason to not. The argument essentially goes "well, users aren't going to be likely to use those characters, unless they're doing something bad, and they make it difficult to insert the email into the database." I feel like that's a kind of laziness - we can fairly effectively remove that risk, and there are well tested tools to do so. But I do suspect that forbidding '+' is explicitly to avoid people using tagged emails. To be honest, the inconsistency in services allowing me to use '+' has caused me to just create a separate email for services that I don't have high trust for. Now no one gets my personal email, and I only check that one if I'm expecting something important.

[0] http://girders.org/blog/2013/01/31/dont-rfc-validate-email-a...

Re: The Dropbox hack is real

#220
post #103

Earlier quoted context omitted.

Password manager + two factor authentication whenever possible. As for the former: Opinions here differ but my recommendation would be not to trust a "cloud" password manager and employ an offline password manager instead. KeePass works great for instance and is open source and cross-platform.

While an offline password manager is inherently more secure, at some point you're either going to have to store the database on a cloud somewhere or worry about constantly keeping your databases in sync. Whether you store it in Dropbox/OneDrive/Google/etc. or use LastPass or another service, there's always going to be some risk. At present I still recommend LastPass because that way you can easily have everything syn…

Storing your keepass database to the cloud vs. Using Lastpass have very different inherent risks.

Even if Google or your Google drive is hacked, assuming you are using a strong passphrase for keypads, you are still OK.

If Lastpass is hacked, that's a different story.

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