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"A tab or window that runs in the background and continually queries the IndexedDB API for available databases can learn what other websites a user visits in real-time," the blog post said. "Alternatively, websites can open any website in an iframe or popup window in order to trigger an IndexedDB-based leak for that specific site."
For every security story, you have to look at “How would this be effective”. For example, there’s currently a critical security flaw in macOS in that if someone has physical access to your computer AND knows your password, they can use the keyboard to type in your password and gain access to your account. If your account is an admin, then they have access to all accounts on your computer! A very serious flaw, to be sure, but I doubt Apple does anything about it.

Here, it mentions something that most users are already aware of and deal with fairly quickly… “a tab or window that runs in the background”. Now, assuming a malicious actor hasn’t already hacked into an ad network, we’re talking about a popup window which most of us see, are annoyed by and close immediately. A closed window can’t continually query anything, and CERTAINLY not in real time.

Additionally, well behaved websites CAN open any website in an iFrame, but would MacRumors do that? Would Apple.com do that? No. There are sites out there that would, but, again, this is a situation where you actively have to put yourself into. If a malicious actor sends you a link via email, and you click on the link, sure, they’d be able to track for as long as you don’t close the browser. BUT, if a malicious actor thinks they can get you to click the link, the payload is going to be FAR more effective than an exploit that “kinda” just tracks you but only if you leave your browser windows open and/or NEVER EVER close popup windows.
 
Wondering what you can do about it in the mean time?

Clear your browser’s history and website data now!! And do it regularly until the patch is available and installed.
 
Wonder if this is fixed in iOS 15.3?
Maybe it’s time for Apple to decouple Safari from the main OS update, so issues like this can be quickly patched just by patching the Safari app.
The issue isn’t in the Safari app. It’s in the underlying WebKit framework. That framework powers anything from Mail to macOS help and the iTunes Store and tons of other things. Apple could ship a different WebKit framework version with Safari only, but that would further complicate things in the short term.
 
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This is what I do as well.
Private mode usually only stops the browser from saving cookies and history. Websites can collect all the data they want.

DuckDuckGo Browser is implementing app tracker blocking - currently in beta, and invite only through the browser settings.
 
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Private browsing mode does not protect against the bug in affected Safari versions.

What about Private Relay? 🤔
 
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Private browsing mode does not protect against the bug in affected Safari versions.

What about Private Relay?
Do you mean TOR?

TOR is as about as slow as watching paint dry in winter. On an isp ping test getting ~100ms standard browser, TOR pinged at ~400ms. And my bank would not allow the connection. Additionally my concern is if the end gateway computer is compromised.
 
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The issue isn’t in the Safari app. It’s in the underlying WebKit framework. That framework powers anything from Mail to macOS help and the iTunes Store and tons of other things. Apple could ship a different WebKit framework version with Safari only, but that would further complicate things in the short term.
Or simply compartmentalize that framework. Google did it on Android, via System Webview, where Google can update it independently from the OS and Chrome.

This bug seems to be serious. Let's see how fast Apple reacted to fix this. I hope it's a wake up call for Apple to start compartmentalizing iOS. Sure, it's difficult, but imo the payoff is worth it all around.
 
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