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My experiences with Pi-hole
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this post was submitted on 18 Apr 2024
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Privacy
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That’s not a well thought out solution.
The problem you’re describing is that the sponsored links get resolved every time the new tab page is opened (ostensibly).
There’s a couple of ways this could be a problem: the most obvious way is if you the user use favicons to determine what underlying software is actually providing a service. Last time I used it it was called favicon hashing because you wouldn’t even physically look at the icon itself, just compare its hash to a list of other hashes to immediately know the attack surface you were looking at.
But that’s tangential and not really related to the new tab page.
The other way it’s a problem is for users, applies to cached favicons and was reported in 2021, websites would compare their locally cached favicons and know that you’d visited before or if you had been logged in before and bunch of other information. It was a big deal because even the then relatively new privacy badger couldn’t stop it. The “fix” was just to resolve favicons as needed every time instead of caching. The impact was minimal, they’re just little icons after all, and that’s where we are today!
So the “phone home” behavior was actually a fix for real in the wild privacy exploitation.
If my response came across as seeing the issue as silly (I read it again, and can’t see it, perfect lemmy post!), it’s possible that understanding leaked through. If you’re determined to view it in a negative light, consider though that I took the person at their word that it was a problem instead of explaining that it’s a fix for another problem that was widely reported and provided detailed instructions for how to disrupt that process.
Sorry, I don't understand this point.
The way I understand it is that the user looks for icons of services it knows, but not the exact icon but just something similar. The thing I don't understand is why is this a problem, but probably I misunderstood something.
I see. I think caching could be solved in a way that does not reintroduce that tracking possibility, though.
One approach would be to only have that cache be used by the new tab page. Page visits always update it, but not read it.
Another would be to always use the cache, but never tell the server that we have that icon cached. The former is probably better though.
In hindsight probably I have misread something. Sorry for the tension.
The first example I gave is a Classico way that a person would examine favicons to determine the software serving the website. If I wanted to do this to your website I’d resolve a bunch of your sites pages and look for a favicon that’s the default of like nginx or something then when I find it I know what I’m up against.
There’s not really a way to do caching that defeats the second example. The whole point of caching is to avoid sending a bunch of data back and forth, so even if you don’t let a website touch and grab all over the objects in the cache and instead only treat the page’s content as a manifest then the website will still be able to figure out what favicons corresponding to dates and times you’ve got in there by seeing weather or not the browser asks for them to be sent.
I guess you could just not say anything to the web server, let it send whatever it wants and ignore it, but at that point you’d be better off to do the default behavior of just not caching favicons instead and skip a step.
But the idea is that the website can't tell that, because websites would use a different cache store than the new tab page.
Even if facebook's icon is saved in the new tab page's cache, when a website wants to load that icon it will only try to find it in the normal cache. If it's not there or it is expired, it is requested again, passed to the normal cache store, and the normal cache store can also give that to the cache store if the new tab page.