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Be careful.
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this post was submitted on 14 Sep 2024
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Why isn't the default behavior for browsers to not allow access to the clipboard? Similar to how it prompts you for access to camera/microphone
Edit: On a per-site basis, like if you use the Zoom website it asks you for access to the webcam, would something like this work for clipboard as well or would it break stuff?
There is no inherent security problem with changing the content of the clipboard. That doesn't do anything until the user pastes it somewhere; of course if that "somewhere" is a command prompt, then that is a security problem, but users really ought to check what they're pasting there before they execute it (yeah, I know, "ought to").
It would be possible to do it the way you say, but that would mean that the user would need to allow that for many websites; I don't think copying from apps like Google Docs would work anymore, and "here's your access token, click here to copy it to the clipboard" features certainly wouldn't.
The screenshot in the OP would then probably be changed to include a step "click: allow clipboard access"; I think most people who fall for the screenshot in the OP would also fall for that.
Exactly. Furthermore they'd probably just include it in those instructions "Step 1: when the box pops up with clipboard press allow"
The browser can't access your clipboard contents without permission, but it can place text into the clipboard.
The problem is people the talking the copied text and pasting it into the command prompt.
Yeah that's what I'm curious about; I'm used to copying code snippets or codes from websites by clicking a button (presumably through some browser API?), but am just now realizing that this in itself has security implications.
Using noscript or some such JS blocker would prevent this but break a lot of other things in the process. That's why I'm wondering why the API isn't locked down via some user prompt.
In Firefox, you can disable the clipboard events. I've done this for the rare case of me copy+pasting a password and forgetting to clear the clipboard after.
On Android, I've noticed that it's possible for apps to read from the clipboard, to read OTP tokens for example. Since I noticed that a while back, I've always been wary of the clipboard on any device I've used.
Only as the result of a user interaction, for example by pressing a button.
From the Browser's viewpoint, would there be any difference if the webpage has a JS button to put something in the clipboard, or it having code running in the background that puts things into the clipboard at page load?
It's not like there's that much of a difference, as far as the Browser is concerned.
Clicking a button shows user intent, whereas a page load doesn't. No user expects loading a page to overwrite their clipboard, but every user that clicks a "Copy to Clipboard" button does expect it.