NO, I don’t need web pages to find a way to play with visited standing — I can just imagine on-line stores seeing what I’m buying from their competition and using that as advertisement tracking. Optimistically marking this bug as mounted, although I already know of a few followup bugs that have to be filed. It’s not supposed to work, since that’s a change in the alpha part of the color. If you imagine there is a bug, might you file it as a separate bug report. It could be good to document no matter invariants this type context satisfies (e.g. those we assert in SetStyleIfVisited). I’m going to attach a sequence of patches that I consider fix this bug.
- This is a more versatile means, preserving most of the design potentialities for the positioning designers, whereas nonetheless letting the person know wich hyperlinks he has gone to.
- The tracking page will then fetch all of the links on that web page.
- Then I assume we have to take a non-CSS method to fixing this, similar to storing all referring domains to a hyperlink in world historical past, and only allowing styling if the web page is within the referring domain.
- When autocomplete results are available burn up and down arrows to review and enter to pick out.
- It might then observe me as I have a glance at a wikipedia web page linked from the comments, and any subsequent pages linked from there.
- // solely the visitedness of the relevant hyperlink should influence type.
This would not should slow anything – the interior code would load the same way it does now, however some sources would block till they are in the cache. Leaking a couple of bits slowly can leak sufficient over time to compromise sensitive secrets. It ought to be the default, despite the very fact that it breaks the spec, as a result of people should not have their privacy violated until they agree, even when a specification says they want to. If I am on a website A and I click on on a link to a different web site B, it will be nice if any hyperlink to B could be seen as «visited» by A. What do you think about restrict the visibility of «visited» for a site A to different domains that had been visited having A as referer? I think it is a bit higher that just proscribing it to identical area.
This does decelerate the attacker, but the attacker can still get personal data from every click on. Let’s say an internet web page shows N hyperlinks that all say «Click right here to continue.» The unvisited links are styled to mix in with the background so the consumer can’t see them. The visited links are seen because of the visited link styling, so the consumer solely see the visited ones. Then the attacker can find out where the consumer’s been by which hyperlink they click on. Please, give users again the power to type visited hyperlinks’ text-decoration, opacity, cursor and the rest of css-properties that we could harmlessly spoof. I do not perceive that check fully, nevertheless it appears to contain accessing a knowledge construction about the web page.
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I imply, presently we do a _full_ historical past lookup for EVERY link within the web page. I do not understand the explanation for all the feedback about how it will change page layout, and so forth. Also remember that these restrictions would solely apply to links that time to foreign domains, so any site can nonetheless do whatever it wants along with his personal hyperlinks. This is a more versatile means, preserving a lot of the design potentialities for the location designers, while still letting the consumer know wich hyperlinks he has gone to. Using this method, an net site can interactively search via your history and discover pages you’ve got visited that could not be guessed simply (provided they’re public webpages). Property blocking and the loading photographs from the stylesheet. Worked round through the use of a «privacy mode» the place the global historical past just isn’t affected.
If the web page reads the construction, or does some rendering that is dependent upon visited state, the actual worth in the structure would not be learn, and it would be spoofed as unvisited. The ultimate stage of adding hyperlink colour could be after the web page had completed rendering (into non-display memory), so it will be tougher to time. I’m undecided if by secure shopping mode you’re referring to non-public browsing mode or not, but when that is the case, we already try this. Inside non-public shopping mode, no hyperlink can be displayed as visited, regardless of if the go to has happened before or after entering the personal browsing mode.
UAs could due to this fact deal with all hyperlinks as unvisited links, or implement other measures to preserve the person’s privacy whereas rendering visited and unvisited links in another way. I do not mind if an attacker can find out whether I’ve visited a given page, one URL at a time, with user interplay . But I do need visited link coloring to work on all of the blogs I go to, even if I haven’t clicked a given link from that weblog earlier than. Any pixel reads would read the model in non-screen reminiscence. The norm for the last donkey’s years on each browser has been that visited links are all the time shown as visited whether or not they’re on the identical domain as what you’re at present viewing.
Yes, one commonplace tutorial research solution to timing channels is «cross-copying», padding alterative management flows with skip directions. That still doesn’t clear up timing channel attacks (see, e.g., test #3, which still works a few of the time for me, and could most likely be made extra reliable). Now please, until you are including something _new_ to this bug, don’t comment on it. There are no restrictions on taking screenshots of your personal website and analyzing the info, unless I missed a current conduct change in fact.
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Certainly the safest path, and the simplest to implement, however again, we lose the performance of knowing whether or not they’re visited or not… Then I suppose we need to take a non-CSS approach to fixing this, similar to storing all referring domains to a link in global history, and only allowing styling if the web page is in the referring area. It is true that these proposed modifications make attacks more difficult and are prone to work well with most websites. Although I assist these changes, I want to level out that they don’t fix all of the identified exploits.
Comment Ninety Four
I think the pref added by the patch is useful for a small fraction of users, and perhaps for a larger number of users if security experts inside or exterior Mozilla explain the problem. Here’s a patch for a structure.css.visited_links_enabled pref, defaulting to true. In other words, commerce some design prospects for privateness, whereas maintaining the complete performance of showing visited hyperlinks. For every visited URL, make a background request to a server that may fetch a replica of the URL and return a listing of links on that web page. 1) It would nonetheless be attainable for an attacker to construct a convincing phishing web page that looks like Wells Fargo to a Wells Fargo buyer and Citibank to a Citibank customer.
In order to repair the bug that I was setting the parent style context incorrectly for the if-visited fashion information for links that were descendants of different hyperlinks. It’s not likely a bug in Firefox it’s a bug within the HTML spec that must be closed but in the meanwhile this QAD solution works simply fine. Firefox will be the only browser that might be able to blocking this exploit then.