147777 :visited Help Allows Queries Into International History

147777 :visited Help Allows Queries Into International History

It’s not really a bug in Firefox it is a bug in the HTML spec that should be closed but in the meanwhile this QAD solution works just fantastic. Firefox would be the only browser that would be able to blocking this exploit then. I do not know, beyond that enormous numbers of web sites distinguish visited hyperlinks based on colors. If the page reads the structure, or does some rendering that is dependent upon visited state, the precise value within the structure would not be read, and it would be spoofed as unvisited. The ultimate stage of including link colour can be after the web page had finished rendering (into non-display memory), so it might be more difficult to time. The norm for the last donkey’s years on each browser has been that visited hyperlinks are at all times shown as visited whether or not they’re on the identical area as what you’re at present viewing.

Another approach to retain partial functionality for foreign links can be to set a flag on a link once it gets activated, in order that a minimal of as lengthy as the web page isn’t reloaded or nonetheless within the fastback-cache, the hyperlinks show up as visited. Guess a few beginning URLs that the person is more doubtless to have visited (e.g planet.mozilla.org, slashdot.org, information.bbc.co.uk) and put them on a webpage. Shared parts utilized by Firefox and other Mozilla software program, together with handling of Web content material; Gecko, HTML, CSS, format, DOM, scripts, images, networking, and so on.

  • I assume the pref added by the patch is helpful for a small fraction of customers, and maybe for a bigger variety of users if security consultants inside or exterior Mozilla explain the difficulty.
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  • Then I think we have to take a non-CSS approach to solving this, such as storing all referring domains to a hyperlink in world historical past, and solely allowing styling if the web page is within the referring domain.
  • I’ve made a proof of concept of this and it works pretty well.
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This is why it considerations me that there seem to be no plans to backport the fix as far as I was capable of finding out. I do not think this may essentially all the time be the case, although in some instances I suspect it’d well be (and observe you should not contemplate my assertions as authoritative). In the first case it’s a privacy violation, which we usually classify as distinct from security issue.

If there were such, that may further downgrade severity. Sounds such as you want layout.css.visited_links_enabled , which has been around for a while . No, it isn’t meant to fix any attacks that involve consumer interplay.

Comment 269

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Thunderbird or NoScript can disable this limitation , and individuals who don’t care much for the security issue as nicely. Another fascinating factor that can be accomplished since bug was fixed is to know in actual time when someone clicks on a link. 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 on a narrative on slashdot that I’ve not read earlier than, that hyperlink will immediately turn into ‘visited’ on the tracking page. The monitoring web page will then fetch all of the hyperlinks on that page. It could then observe me as I take a glance at a wikipedia web page linked from the comments, and any subsequent pages linked from there. In order to fix the bug that I was setting the parent style context incorrectly for the if-visited type data for hyperlinks that have been descendants of different hyperlinks.

Comment 38

Yes, that’s upsetting in your case of PowerPC Mac, however this bug isn’t the right discussion board for that query. I do not have the time now to work on this more, but you possibly can fork my code above to check this text-decoration issue. Because define does not move the content material in any respect, it could only change a colour.

Remark 140

Worked round by utilizing a « privateness mode » where the worldwide historical past just isn’t affected. Issues with loading CSS fashion sheets from the network, parsing type sheets and style attributes in HTML markup, performing the CSS cascade, selector matching, and producing appropriate computed values for CSS properties. Those data didn’t shock Amanda Pasciucco, a marriage that’s licensed family specialist in Hartford. She said she works along with an entire lot of teens, and has now undoubtedly seen attitudes about sex and relationships develop extra stimulating with time.

Comment 166

I’m going to attach a series of patches that I imagine repair this bug. Once you could have carried out that, you can go on implementing some fancy same-origin-policy method myfreecsm, SafeHistory, SafeCache, whatever. What I see from the user perspective is a severe, serious privacy problem.

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This is a extra versatile method, preserving a lot of the design potentialities for the location designers, while nonetheless letting the consumer know wich links he has gone to. Using this method, a web site can interactively search through your historical past and discover pages you have visited that could not be guessed easily (provided they’re public webpages). And read the color of that span factor via javascript. Given that, I’m truly beginning to assume that the only secure property is ‘colour’. Property blocking and the loading pictures from the stylesheet.

Are you positive that you simply had really entered the personal shopping mode? If you had, your window title should have had «  » at its finish, however within the screenshot that you’ve got posted, that is not the case. Perhaps as quickly as there is a call to read a pixel it switches to a double-rendering mode where 2 bitmaps are maintained, and most rendering is copied into each. One is displayed, and link color is dependent upon whether or not the hyperlink has been visited.

This does decelerate the attacker, but the attacker can still get private information from each click. Let’s say a web page reveals N hyperlinks that each one say « Click right here to proceed. » The unvisited links are styled to mix in with the background so the user cannot see them. The visited hyperlinks are seen due to the visited hyperlink styling, so the consumer solely see the visited ones. Then the attacker can find out the place the person’s been by which hyperlink they click on on. Please, give customers back the power to style visited hyperlinks’ text-decoration, opacity, cursor and the relaxation of css-properties that we might harmlessly spoof. I do not perceive that take a look at fully, but it seems to involve accessing a data construction about the web page.