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really_bz's profile
Boris
Boris
Boris
@really_bz

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Boris

@really_bz

Used to be bz_moz

Joined May 2011

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    1. Thomas Steiner‏ @tomayac 13 Dec 2019
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      • Report NetzDG Violation

      🎉 The Scroll to Text Fragment proposal (https://wicg.github.io/ScrollToTextFragment/ …) now has 4 LGTMs, i.e., is ready to ship! It allows you to truly deep-link into docs—even when there's no # anchor. Here's a sample URL: https://blog.tomayac.com/2019/12/12/same-same-but-different-unicode-variation-selector-16/#:~:text=textual%20%E2%98%83%EF%B8%8E,representation%20%E2%98%83%EF%B8%8F … ⛄️ (Test with flag 🚩 #​enable-text-fragment-anchor)pic.twitter.com/gwFB8EpEKJ

      Scroll to Text Fragment URL in action, the document is scrolled to the selected fragment.
      3 replies 25 retweets 54 likes
    2. Pete Snyder‏ @pes10k 15 Dec 2019
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      Replying to @tomayac

      I'm nervous about this, giving the sending site control over browser-operation on the receiving site can lead to lots of S&P problems. e.x.…

      1 reply 0 retweets 1 like
    3. Pete Snyder‏ @pes10k 15 Dec 2019
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      Replying to @pes10k @tomayac

      1. I'm in a situation where I can view DNS traffic (e.g. company network), and I send a link to the company health portal, with `#:~:text=cancer`. On certain page layouts, i might be able tell if the employee has cancer by looking for lower-on-the-page resources being requested

      1 reply 0 retweets 0 likes
    4. Pete Snyder‏ @pes10k 15 Dec 2019
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      Replying to @pes10k @tomayac

      2. Seems to enable new types of spoofing / phishing (since in some cases I can control initial page display in a way the site owner didn't anticipate)

      1 reply 0 retweets 1 like
    5. Pete Snyder‏ @pes10k 15 Dec 2019
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      Replying to @pes10k @tomayac

      In general, giving the sending site control over the initial-display of the receiving site, in a way unanticipated by the receiving site's authors, seems very dangerous, and violates user intuitions over who controls what

      2 replies 0 retweets 0 likes
    6. BrendanEich‏Verified account @BrendanEich 15 Dec 2019
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      Replying to @pes10k @tomayac

      Cc: @bz_moz -- how is this not in effect a violation of SOP restrictions on fetch + DOM access that have stood from '90s on?

      2 replies 0 retweets 0 likes
    7. Boris‏ @really_bz 16 Dec 2019
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      Replying to @BrendanEich @pes10k @tomayac

      The issue here comes from being able to observe outside-the-browser effects like DNS traffic. That is an entity that can see your DNS traffic controls site A, it can link to site B and exfiltrate something about the resulting site B state from the DNS traffic.

      1 reply 0 retweets 1 like
      Boris‏ @really_bz 16 Dec 2019
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      Replying to @really_bz @BrendanEich and

      Site A itself is not getting any info out of site B (SOP working as intended), but there's an attack on a lower level of the network stack on what resources site B is fetching. DNS is only "needed" to the extent that site B is using https; otherwise you can just see the requests

      11:54 AM - 16 Dec 2019
      • 1 Like
      • BrendanEich
      1 reply 0 retweets 1 like
        1. Boris‏ @really_bz 16 Dec 2019
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          Replying to @really_bz @BrendanEich and

          Anyway, DoH + ESNI or equivalent seem like they would do a lot to mitigate this attack. Of course an attacker with low-level network access and a good understanding of the victim page structure could still try to glean information from the amount of data transferred...

          0 replies 0 retweets 0 likes
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