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An external image showing your user-agent and the total hit count

  • Muddybulldog@mylemmy.win
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    1 year ago

    None (by Lemmy), as Lemmy doesn’t actually request the image (that would be proxying). Your browser requests the image directly by URL. Lemmy, technically, doesn’t even know an image exists. It just provides the HTML and lets your browser do the work.

    • A_A@lemmy.world
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      1 year ago

      Exactly. The text of this post is simply :

      ![An external image showing your user-agent and the total "hit count"](https://trilinder.pythonanywhere.com/image.jpg)
      I get the same result when I browse directly to the link.

      So, if OP links a malcious website we have a problem … (?).

      • Goddard Guryon@sopuli.xyz
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        1 year ago

        Oh dangit, it’s simpler than I thought. So the only data being sent is…just whatever is sent in your average GET request.

        • newIdentity@sh.itjust.works
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          1 year ago

          Yes. It’s also a pretty standard way of serving images. A lot of Email clients do that too.

          That’s also how these services that show you when a email is read work.

      • newIdentity@sh.itjust.works
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        1 year ago

        Not really that huge of a problem. When making requests you also usually send a header which includes the user agent.

        The program just logs how many times the image has been requested and it reads the user agent data. No Javascript is actually executed.

        Well it might be possible to have a XSS somehow but I haven’t really done much research into this possibility.

        In general it’s a pretty standard way of handling embedded images. Email does this too. That’s how you have these services that can check if someone read a mail

    • CoderKat@lemm.ee
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      1 year ago

      Yup. And to add, your browser will send things like:

      1. Your IP address. Technically this is sent by the OS doing networking and is unavoidable. At best, a VPN can hide this, because the VPN sits in the middle.

      2. Various basic request headers, which most notably contains user agent (identifies browser) and language headers, both which you can fake if you want to.

      3. Cookies for that domain (if you have any). Those can track you across multiple requests and thus build up a profile of you.

      • odbol@lemmy.world
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        1 year ago

        That’s why you should use a native app, which won’t send any of that identifying info (except for IP but there’s nothing you can do on that)