147777 :visited Help Allows Queries Into Global History
This does slow down the attacker, however the attacker can nonetheless get private info from every click on. Let’s say an internet web page reveals N hyperlinks that each one say «Click right here to continue.» The unvisited links are styled to mix in with the background so the user can’t see them. The visited hyperlinks are seen because of the visited link styling, so the user only see the visited ones. Then the attacker can discover out where the user’s been by which hyperlink they click on on. Please, give users again the power to style visited hyperlinks’ text-decoration, opacity, cursor and the rest of css-properties that we might harmlessly spoof. I do not perceive that take a look at fully, however it appears to involve accessing a data structure in regards to the page.
I do not see why there can be a timing vulnerability involving the cache, but if there could be it could possibly most likely be compensated for. Oh, why did you block the power to set text-decoration, opacity and cursor for the visited links? They cannot transfer any elements on the page, and the values for these properties, that get sent to the positioning – we might spoof them so the site won’t know whether we had visited any links on that website before. Anyway, I discover one property of the «restrict CSS properties of visited hyperlinks to color and so forth.» very sketchy, namely that it abruptly becomes a _security-critical behaviour_ that shade not affect measurement or different properties of hyperlinks. It’s a wise assumption, to make certain, but I might actually imagine some version of some OS breaking it. Maybe, as an example, the antialiaser reveals some subtle dependency from shade to size, characters of a more contrasting shade having a tiny tiny subpixel difference in width — voila, safety hole. I’m unsure if by secure browsing mode you’re referring to private shopping mode or not, but if that is the case, we already try this.
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- This is why it considerations me that there seem to be no plans to backport the fix so far as I was able to find out.
- This strategy, so far as I know, is straightforward to implement with the present Places database, which traces the referer of each visited link, and can be the one pioneered by the SafeHistory extension.
I’m going to connect a collection of patches that I believe fix this bug. Once you may have done that, you can go on implementing some fancy same-origin-policy approach, SafeHistory, SafeCache, whatever. What I see from the user perspective is a critical, critical privateness concern.
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There are not any restrictions on taking screenshots of your own web site and analyzing the data, except I missed a latest habits change after all. SafeHistory stops you seeing what links you have visited in a number of instances if you wish to know, and allows the web page to see in a number of instances when it shouldn’t. Or maybe the option to solely permit color adjustments must also disable pixel reads. I imply, presently we do a _full_ historical past lookup for EVERY link within the web page. I don’t understand the explanation for all of the feedback about how it will change web page structure, and so on. Also understand that these restrictions would only apply to links that time to overseas domains, so any website can still do no matter it wants with his own hyperlinks.
Allowing them to be set wouldn’t fix the exploit in any helpful method. It’s performance-sensitive code, and it may be run at times when it’s inappropriate to name into script. This also has the advantage that a change in the state of a component does not require accessing the server again . That nonetheless does not remedy timing channel assaults (see, e.g., check #3, which nonetheless works some of the time for me, and could probably be made more reliable). Now please, unless you are including something _new_ to this bug, do not touch upon it.
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Another approach to retain partial performance for overseas links would be to set a flag on a link as quickly as it gets activated, so that a minimal of as lengthy as the web page is not reloaded or still within the fastback-cache, the hyperlinks show up as visited. Guess a couple of beginning URLs that the person is prone to have visited (e.g planet.mozilla.org, slashdot.org, information.bbc.co.uk) and put them on a webpage. Shared parts used by Firefox and different Mozilla software program, together with handling of Web content; Gecko, HTML, CSS, structure, DOM, scripts, images, networking, and so forth.
This is why it issues me that there seem to be no plans to backport the fix so far as I was able to find out. I don’t assume this is in a position to essentially all the time be the case, although in some instances I suspect it’d properly be (and observe you should not consider my assertions as authoritative). In the primary case it’s a privacy violation, which we normally classify as distinct from security issue.
If there have been such, which may further downgrade severity. Sounds such as you want format.css.visited_links_enabled , which has been round for some time . No, it isn’t intended to fix any assaults that involve user interaction.
What used to take a Tricaster/Video Toaster setup can now be done in software program using a regular PC. I can change forwards and backwards between trainer view, demonstration digicam, viewers view, presentation slide deck or video, etc… and it is seamless. I’d additionally like to avoid using fallback colours in circumstances where they weren’t before . So my requirement is that we never change which paint server is used based mostly on visitedness, or whether one is used.
Thunderbird or NoScript can disable this limitation , and individuals who don’t care a lot for the security issue as nicely. Another interesting factor that can be accomplished since bug was mounted is to know in real time when someone clicks on a hyperlink. For example, you can go to a page that did the type of tracking described above, then hold it open in a background tab. If I click on a narrative on slashdot that I’ve not read before, that hyperlink will instantly become ‘visited’ on the tracking web page. The monitoring page will then fetch all the links on that page. It might then comply with me as I have a glance at a wikipedia web page linked from the feedback, and any subsequent pages linked from there. In order to repair the bug that I was setting the parent type context incorrectly for the if-visited fashion knowledge for links that were descendants of different links.