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Thread: CSS History Leak and how to prevent it even with enabled history [Firefox & Opera]

  1. #46
    Moderator anon's Avatar
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    "Empty Temporary Internet Files folder when browser is closed" by clicking in the empty check box.
    Doesn't that just clear the cache?

    You could set IE to remember the history for "0" days, though. Or use Browzar...
    "Come visit sometime, okay? We'll always be here for you. We... we all love you."
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  2. #47
    Dynamic's Avatar
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    There is an option in FF to also clear all history when you close it...The only thing I see that it will help is if you browse SB-I after you browse trackers beause if you browse SB-I before trackers than they can still see you...

    I use Private Browsing in FF for security, that should prevent trackers to see where I have visted.

    Is there a way to have both Private and Normal mode up at the same time in FF?

    I tried to open up normal with private still on and the new browser turned private...
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  3. #48
    Moderator anon's Avatar
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    Quote Originally Posted by Dynamic View Post
    Is there a way to have both Private and Normal mode up at the same time in FF?
    You can't. But you can still keep a separate profile for SB-I, set to delete private data after closing, and another one for trackers, and using different profiles at the same time is possible.
    "Come visit sometime, okay? We'll always be here for you. We... we all love you."
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  4. Who Said Thanks:

    anonftw (20.07.09)

  5. #49

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    Hi, I always keep history disabled on firefox, is that enough to keep me safe then? The only option i have ticked there is "remember what i've downloaded".
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    Quote Originally Posted by Haggar View Post
    Hi, I always keep history disabled on firefox, is that enough to keep me safe then? The only option i have ticked there is "remember what i've downloaded".
    Yeah, I think you should be safe.
    However, visit these websites below and make sure your browsing history isn't there ("0 pages found")

    Sniffing Browser History: A Live Example
    Sniffing Browser History with NO Javascript!


    After I search more about this issue, I find that this is an old bug, reported in 2002 by David Baron for Firefox browser.

    Bug 147777 - :visited support allows queries into global history
    https://bugzilla.mozilla.org/show_bug.cgi?id=147777

    Unfortunately, the userContent.css method only fix the CSS attack, but to disable javascript attack you have to use NoScript extension.
    If you don't want to use NoScript extension, here's the easy way to fix this bug (Firefox only) :



    - Type about:config in the address bar
    - In the filter list, type layout.css.visited_links_enabled
    - The default value is true, we must change the value to false
    - Right click layout.css.visited_links_enabled and choose Toggle, this will change the status to user set and value to false
    - Restart your firefox

    I already test this method against the websites below and the history scan gives 0 result,
    so this method should work against javascript and css attack.
    Javascript Attack : Sniffing Browser History: A Live Example
    CSS Attack : Sniffing Browser History with NO Javascript!
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  8. #51
    Moderator anon's Avatar
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    Quote Originally Posted by Zorvak View Post
    After I search more about this issue, I find that this is an old bug, reported in 2002 by David Baron for Firefox browser.

    Bug 147777 - :visited support allows queries into global history
    https://bugzilla.mozilla.org/show_bug.cgi?id=147777

    Unfortunately, the userContent.css method only fix the CSS attack, but to disable javascript attack you have to use NoScript extension.
    If you don't want to use NoScript extension, here's the easy way to fix this bug (Firefox only) :

    ...
    Great work. I think I'll add this to the announcement.
    "Come visit sometime, okay? We'll always be here for you. We... we all love you."
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  9. #52
    Quote Originally Posted by Zorvak View Post
    - Type about:config in the address bar
    - In the filter list, type layout.css.visited_links_enabled
    - The default value is true, we must change the value to false
    - Right click layout.css.visited_links_enabled and choose Toggle, this will change the status to user set and value to false
    - Restart your firefox
    what version of ff do you use, because i don't have that option? i have 3.0.11 version
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  10. #53
    Moderator anon's Avatar
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    Quote Originally Posted by hojotrance View Post
    because i don't have that option?
    Perhaps you need to create it?
    "Come visit sometime, okay? We'll always be here for you. We... we all love you."
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  11. #54

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    Quote Originally Posted by anon View Post
    Perhaps you need to create it?
    No, the option is already there in Firefox 3.5.1.

    Quote Originally Posted by hojotrance View Post
    what version of ff do you use, because i don't have that option? i have 3.0.11 version
    I'm using Firefox 3.5.1, you need to upgrade it at least to 3.5 to see layout.css.visited_links_enabled option.

    Upgrade your Firefox to 3.5.1 :

    In Firefox : Help -> Check for Updates

    Or download the newest version directly from the official page :
    Firefox Product Page : Firefox Browser | Free ways to customize your Internet
    Download Link : Mozilla Download
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  13. #55
    Moderator anon's Avatar
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    Quote Originally Posted by Zorvak View Post
    I'm using Firefox 3.5.1, you need to upgrade it at least to 3.5 to see layout.css.visited_links_enabled option.
    Good, I have added this info and the tweak to our security announcement.
    "Come visit sometime, okay? We'll always be here for you. We... we all love you."
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  15. #56

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    Update
    After I do several tests, userContent.css can't protect you against this CSS attack and its variation :

    Code:
    userContent.css
    a:visited{
      background: none !important;
      background-image: none !important;
      list-style-image: none !important;
    }
    CSS Attack 1, userContent.css will protect you against this attack
    Code:
    <style type="text/css">
    #link1 {
      color: blue;
    }
    
    #link1:visited{
      color: red;
      background: url(/log.php?visited_url=en.wikipedia.org);
    }
    </style>
    
    <a id="link1" href="http://en.wikipedia.org/">Wikipedia</a>
    CSS Attack 2, userContent.css won't protect you against this attack
    Code:
    <style type="text/css">
    #link1 {
      color: blue;
    }
    
    #link1:visited randomstring{
      color: red;
      background: url(/log.php?visited_url=en.wikipedia.org);
    }
    </style>
    
    <a id="link1" href="http://en.wikipedia.org/"><randomstring>Wikipedia</randomstring></a>
    Yeah, just by adding <randomstring> tag it will bypass userContent.css protection.
    Therefore, I recommended you upgrade to Firefox 3.5.1 and use layout.css.visited_links_enabled method to completely disable this attack.
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  17. #57

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    and how I can enable it this ? It must be true or false ?
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  18. #58

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    Quote Originally Posted by atlantis View Post
    and how I can enable it this ? It must be true or false ?
    set it to False in FireFox 3.5 or higher following the instructions below.

    Quote Originally Posted by Zorvak View Post
    - Type about:config in the address bar
    - In the filter list, type layout.css.visited_links_enabled
    - The default value is true, we must change the value to false
    - Right click layout.css.visited_links_enabled and choose Toggle, this will change the status to user set and value to false
    - Restart your firefox
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    alpacino (21.07.09) , atlantis (21.07.09)

  20. #59

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    Quote Originally Posted by atlantis View Post
    and how I can enable it this ? It must be true or false ?
    Atlantis, see my previous post :
    http://www.sb-innovation.de/f59/css-...tml#post116433

    The default value for layout.css.visited_links_enabled is true, you must change it to false, by toggling it.
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  21. #60

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    Actually my scans are clear but I'll set it to false for more safe
    Last edited by atlantis; 21.07.09 at 14:11.
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