Stories
Slash Boxes
Comments

SoylentNews is people

Third-Party Web Content is Unsafe, Including CSS. Don't Use It.

posted by Fnord666 on Wednesday February 28 2018, @06:07PM   Printer-friendly
from the just-use-lynx-and-elm dept.

canopic jug writes:

Jake Archibald writes in his blog about the bigger problem presented by importing third-party content into web pages. Even CSS is a problem as a CSS keylogger demo showed the other day.

A few days ago there was a lot of chatter about a 'keylogger' built in CSS.

Some folks called for browsers to 'fix' it. Some folks dug a bit deeper and saw that it only affected sites built in React-like frameworks, and pointed the finger at React. But the real problem is thinking that third party content is 'safe'.

While most are acutely aware, yet ignore, the danger presentd by third-party javascript and javascript in general, most forget about CSS. Jake reminds us and walks through quite a few exampled of how CSS can be misused by third-parties exporting it.

Source : Third party CSS is not safe

Original Submission

 
This discussion has been archived. No new comments can be posted.
Third-Party Web Content is Unsafe, Including CSS. Don't Use It. | Log In/Create an Account | Top | 78 comments | Search Discussion
Display Options Threshold/Breakthrough Mark All as Read Mark All as Unread
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.

  • (Score: 3, Informative) by DannyB on Wednesday February 28 2018, @08:59PM (1 child)

    by DannyB (5839) Subscriber Badge on Wednesday February 28 2018, @08:59PM (#645394) Journal

    A fun uMatrix tip.

    I've noticed a number of anti-adblocking sites. I go to their page and the site briefly appears, and then is immediately replaced by a fully white background that says

    Something interfered with this website loading.

    I simply turn off 1st party scripts, refresh, and everything seems good.

    In the past, and for years, in some cases I could simply View --> Page Style --> No Style. But no longer.

    uMatrix is so much better than AdBlock -- if you are a geek. It gives you a lot finer control. The ability to individually indicate whether to accept cookies, frames, CSS, HTML, media, even XHR from any site that the page attempts to load from.

    --
    To transfer files: right-click on file, pick Copy. Unplug mouse, plug mouse into other computer. Right-click, paste.
    Starting Score:    1  point
    Moderation   +1  
       Informative=1, Total=1
    Extra 'Informative' Modifier   0  
    Karma-Bonus Modifier   +1  
    Total Score:   3  

  • (Score: 0) by Anonymous Coward on Thursday March 01 2018, @12:41AM

    by Anonymous Coward on Thursday March 01 2018, @12:41AM (#645526)

    uBlock's eye dropper tool lets you block individual elements like those.