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Comment by illiac786 | Hacker News Reader

Well there is still the small detail of them not storing any logs.

This is a massive issue in my view, it allows correlation across multiple VPNs exit nodes, but that’s it. It doesn’t allow to identify you automatically. It does significantly lower the bars for identifying you though, but the requirements are still high.

Hopefully they fix this soon.

I can’t believe this type of “let’s make it a hash or something sensitive” still happen, and at mullvad, of all places. Why not randomise it simply?

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> It does significantly lower the bars for identifying you though, but the requirements are still high

If you squint a bit, it looks a lot like a "Nobody But US" (NOBUS[1]) scheme. A few more identifying bits could tip the scale for party that has a whole host of other bits on a list of suspects, without being useful to most other people.

1. https://en.wikipedia.org/wiki/NOBUS

You definitely need glasses then.

Let me specify: The user must have entered his data on one site which the attacker has control of. That is a high bar still.

it really isn’t.

Examples?

IP addresses are metadata - and don't require search warrants, meaning they are fair game for dragnet surveillance. Tapping into a backbone, a la Room 641A, can be used to cross-reference timestamped public posts on an anonymous message board to other data sources (e.g. subpoena Netflix for payer based of Netflix's access logs from VPN exit IPs)

please read the thread again. The parent said “it is not a high bar to own a website where a user is entering personal data”. I strongly disagree, although “high” is obviously not measurable.

Maybe I should again be more specific, again.

high bar for me is, you need to be a state sponsored hacker basically, or a large criminal organisation. Or a single, very skilled and high motivated person maybe.

The attack surface is far larger than what you specified. Any networking equipment sotting between the client and server(s) can pick up and log IP addresses.

Knowing the online services one uses, and the times (to the millisecond) they used them goes a long way to deanonymize individuals. Correlating Internet routing events is very effective when combined with other data sources, like physical surveillance and knowing the exact times the target got home, or interacted with their phone after getting a DM alert.

What’s the difference if Mullvad did not have the vulnerability described above?

The vulnerability enables clustering outgoing Mullvad traffic into user-sized buckets based on metadata analysis alone.

Clustering, in turn, allows time-based deanonymization[1], against the users assumptions of being sufficiently anonymized.

Adversaries who do not enjoy a backbone-traffic MitM vantage point cannot exploit this vulnerability, which makes it appear NOBUS-y.

1. Any *aaS, forum, or board, when given a (Mullvad!) IP address and series of request timestamps, and a subpoena, can yield PII on the real identity (email, phone, billing address)

but, to cluster this traffic, wouldn’t you need equipment between each and every mullvad exit node and each and every server the user access? Or at least a large proportion of it?

Are you talking about a surveillance state?

Then why complicate it by being publicly insecure? If Mullvad were wanting to defeat anonymity, they could simply log the traffic metadata while falsely advertising they aren't.

Their ads on San Francisco's public transit are good.

"public insecure" JFC

Security is always a balance. Always

AI is showing that everything has a weak spot (wondering where are the "I don't make mistakes with C" now people are - but that's for another discussion)

There's another commenter mentioning this makes sense because exactly it avoids them keeping information on which customer is matched to which server. You know, one of the things you don't want to log

Could it be done better? Probably.

Here's a better idea, logging off is 100% safe

Meanwhile 99% of the normies will go for NordVPN

Good VPNs tout the fact that they had nothing to give in response to a subpoena, or that there was nothing a law enforcement agency to find when they seized a server. For mullvad to be effective as a honey pot it needs to survive these events with its reputation in tact.

If it were a true honeypot by a state agency, they'd be able to just lie about having nothing too.

Not when people get arrested and the investigative techniques, sources, etc are made public. They would have to intervene in the legal process to make sure mullvad's role was kept secret. Presumably this isn't always feasible across jurisdictions.

Parallel construction

There's a real value for no such agency types having something that is secure against "normal" government activity - a subpoena is one thing, and designing something that defeats that gives you a lot of legitimacy.

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