Maybe, for example, the antialiaser displays some subtle dependency from color to size, characters of a extra contrasting colour having a tiny tiny subpixel distinction in width — voila, security gap. I do not know, past that enormous numbers of net sites distinguish visited links primarily based on colours. I’m interested to see what hyperlinks I’ve visited, but I don’t care about fancy styles. A totally different color for visited links is sufficient, and if a web page queries the color it might be informed the unvisited colour, or if the info sort allows, it can be informed both colors.
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- An attacker may simulate the photographs as a grid of 1 pixel hyperlinks, and simulating the textual content should be straightforward.
- The spec is so badly broken here that for once I say toss the spec.
- It’s a sensible assumption, to make sure, however I might actually imagine some model of some OS breaking it.
- You can do nice issues along with your performer and in addition purple discussions to start it going.
I do not think this would essentially at all times be the case, though in some instances I suspect it’d nicely be (and observe you should not consider my assertions as authoritative). In the primary case it’s a privateness violation, which we usually classify as distinct from safety problem. Sounds like you need format.css.visited_links_enabled , which has been round for some time . It’s performance-sensitive code, and it may 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 test transparency, and therefore colour.
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Plus we might spend plenty of time on backporting as an alternative of of engaged on efficiency or other features. So as I mentioned it is a question of trade-offs, that are by no means simple. This is why it issues me that there appear to be no plans to backport the fix so far as I was able to find out.
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Another attention-grabbing factor that could be carried out since bug was fixed is to know in actual time when someone clicks on a link. For example, you can visit a page that did the kind of tracking described above, then maintain it open in a background tab. If I click on on a narrative on slashdot that I’ve not read earlier than, that hyperlink will instantly turn into ‘visited’ on the monitoring page.
Comment One Hundred Forty
Certainly the most secure path, and the best to implement, however again, we lose the performance of knowing whether they are visited or not… Then I suppose we have to take a non-CSS approach to fixing this, similar to storing all referring domains to a link in global historical past, and only allowing styling if the page is within the referring domain. It is true that these proposed adjustments make assaults tougher and are more probably to work well with most websites. Although I help these changes, I would like to point out that they don’t repair the entire known exploits.
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This does decelerate the attacker, but the attacker can still get non-public info from each click on. Let’s say a web web page exhibits N hyperlinks that all say “Click right here to proceed.” The unvisited links are styled to blend in with the background so the consumer cannot see them. The visited links are seen due to the visited link styling, so the user solely see the visited ones. Then the attacker can find out the place the consumer’s been by which link they click on. Please, give users back the ability to style visited links’ text-decoration, opacity, cursor and the rest of css-properties that we could harmlessly spoof. I do not understand that test fully, however it appears to contain accessing a knowledge construction concerning the page.
To break this feature is breaking one of the most useful visual feedback elements of a web browser. The content material on a page shouldn’t be able to learn the actual color of hyperlinks. But then if the reads of individual pixels impact rendering you get a recursive downside and it might take a huge amount of sources to completely render. 2) It would still be attainable for an attacker to be taught information about the user’s history at different websites primarily based on where they click on and don’t click on. For example, and attacker may have a huge hyperlink that says “Click right here” and solely customers with a certain historical past entry would see it and click on on it because it blends in with the background otherwise.
NO, I don’t want websites to find a way to play with visited standing — I can just imagine online stores seeing what I’m shopping for from their competition and using that as advertisement tracking. Optimistically marking this bug as mounted, though I already know of a few followup bugs that have to be filed. It’s not alleged to work, since that is a change in the alpha element of the colour. If you consider there is a bug, could you file it as a separate bug report. It might be good to document whatever invariants this fashion context satisfies (e.g. the ones we assert in SetStyleIfVisited). I’m going to connect a collection of patches that I believe repair this bug.
I suppose the pref added by the patch is beneficial for a small fraction of users, and maybe for a bigger number of customers if safety consultants inside or exterior Mozilla explain the issue. Here’s a patch for a layout.css.visited_links_enabled pref, defaulting to true. In other phrases, commerce some design prospects for privacy, while preserving the total functionality of displaying visited hyperlinks. For every visited URL, make a background request to a server that will fetch a replica of the URL and return an inventory of hyperlinks on that web page. 1) It would still be attainable for an attacker to construct a convincing phishing page that appears like Wells Fargo to a Wells Fargo customer and Citibank to a Citibank customer.
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I can switch back and forth between instructor view, demonstration digicam, viewers view, presentation slide deck or video, etc… and it’s seamless. In a nutshell, it really lets me showcase the content with out requiring expensive know-how and having the know-how management what can happen. This could also be manually corrected, nonetheless, in Logitech’s easy digicam settings software, which lets you administration the color myfrecams intensity and white steadiness. What used to take a Tricaster/Video Toaster setup can now be done in software program program using a daily PC. I can change backwards and forwards between trainer view, demonstration digital camera, viewers view, presentation slide deck or video, etc… and it’s seamless. I’d additionally prefer to avoid utilizing fallback colors in instances where they weren’t earlier than .
I was speaking to Sai about this and he advised I make a remark right here — so I have not learn through and understood the present state of discussion, apologies. Those are each detectable via performance traits. Allowing them to be set would not fix the exploit in any useful method.