I was talking to Sai about this and he suggested I make a comment here — so I haven’t read by way of and understood the present state of discussion, apologies. Those are each detectable through performance characteristics. Allowing them to be set wouldn’t repair the exploit in any helpful means.
To break this feature is breaking one of the helpful visual suggestions elements of a web browser. The content on a page should not be able to read the precise color of links. But then if the reads of particular person pixels impact rendering you get a recursive drawback and it might take an enormous quantity of resources to completely render. 2) It would nonetheless be potential for an attacker to learn details about the person’s historical past at different sites based mostly on the place they click and do not click on. For example, and attacker could have a huge hyperlink that says “Click here” and solely users with a certain history entry would see it and click it as a outcome of it blends in with the background in any other case.
Another fascinating factor that can be done since bug was fastened is to know in real time when somebody clicks on a hyperlink. For instance, you can visit a page that did the sort of tracking described above, then keep it open in a background tab. If I click on on a narrative on slashdot that I’ve not read earlier than, that link will immediately turn into ‘visited’ on the tracking web page.
I can switch back and forth between instructor view, demonstration digital camera, audience view, presentation slide deck or video, etc… and it’s seamless. In a nutshell, it actually lets me showcase the content with out requiring costly expertise and having the know-how management what can happen. This may be manually corrected, nevertheless, in Logitech’s straightforward digicam settings software program, which helps you to management the colour intensity and white stability. What used to take a Tricaster/Video Toaster setup can now be done in software program utilizing a regular PC. I can change forwards and backwards between teacher view, demonstration digicam, viewers view, presentation slide deck or video, etc… and it is seamless. I’d additionally like to avoid using fallback colors in cases the place they weren’t before .
Maybe, for instance, the antialiaser reveals some delicate dependency from shade to size, characters of a extra contrasting shade having a tiny tiny subpixel difference in width — voila, security gap. I do not know, beyond that giant numbers of sites distinguish visited hyperlinks primarily based on colors. I’m involved to see what links I’ve visited, but I don’t care about fancy types. A totally different colour for visited hyperlinks is enough, and if a page queries the colour it can be advised the unvisited colour, or if the information kind allows, it may be told both colours.
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Certainly the most secure path, and the easiest to implement, however again, we lose the functionality of understanding whether or not they are visited or not… Then I think we have to take a non-CSS strategy to solving this, corresponding to storing all referring domains to a hyperlink in international history, and only permitting styling if the web page is in the referring domain. It is true that these proposed modifications make attacks more difficult and are likely to work properly with most websites. Although I support these changes, I would like to point out that they do not repair all of the recognized exploits.
Plus we’d spend lots of time on backporting as an alternative of of engaged on efficiency or different features. So as I said it’s a question of trade-offs, that are by no means straightforward. This is why it considerations me that there appear to be no plans to backport the fix so far as I was able to find out.
I assume the pref added by the patch is beneficial for a small fraction of customers, and perhaps for a larger variety of customers if safety consultants inside or outside Mozilla clarify the problem. Here’s a patch for a structure.css.visited_links_enabled pref, defaulting to true. In other phrases, trade some design possibilities for privateness, while maintaining the full performance of exhibiting visited hyperlinks. For every visited URL, make a background request to a server that can fetch a replica of the URL and return a listing of hyperlinks on that web page. 1) It would still be attainable for an attacker to construct a convincing phishing web page that looks like Wells Fargo to a Wells Fargo customer and Citibank to a Citibank customer.
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NO, I don’t need web sites to have the ability to play with visited status — I can simply think about online shops seeing what I’m shopping for from their competitors and utilizing that as advertisement monitoring. Optimistically marking this bug as fixed, though I already know of some followup bugs that need to be filed. It’s not supposed myfreecasm to work, since that’s a change in the alpha part of the color. If you consider there’s a bug, might you file it as a separate bug report. It could be good to doc no matter invariants this type context satisfies (e.g. those we assert in SetStyleIfVisited). I’m going to connect a sequence of patches that I believe fix this bug.
I do not suppose this is in a position to essentially at all times be the case, though in some instances I suspect it might well be (and observe you shouldn’t consider my assertions as authoritative). In the first case it is a privateness violation, which we normally classify as distinct from safety problem. Sounds such as you need layout.css.visited_links_enabled , which has been round for a while . It’s performance-sensitive code, and it could be run at occasions when it is inappropriate to call into script. However, if we add support for pointer-events values that make hit testing depend upon pixel transparency, then elementFromPoint could possibly be used to check transparency, and therefore color.
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