Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

drodyc's avatar
drodyc
Icon for Nimbostratus rankNimbostratus
May 18, 2021

iFrames iRule

The distant end customer is requesting for iFrame headers for their application via HTTPS. How would I activate iFrame headers with iRules?   Could I have one written out for a specific URL and o...
devops
iframes
irule
irules
LTM
Dario_Garrido's avatar
Dario_Garrido
Icon for Noctilucent rankNoctilucent
May 18, 2021

Hello Drodyc.

The iframes should be constructed in your backend server for being delived to your clients.

After that, you can use them in a different sites using something like this:

<iframe src="https://mydomain.com"></iframe>

For security reasons, one browser is not going to display iframes not belonging to the domain requested.

You can control that using one specific HTTP header called 'X-Frame-Options' (see https://developer.mozilla.org/es/docs/Web/HTTP/Headers/X-Frame-Options).

So you can configure your website to allow iframes from 'mydomain.com' using this HTTP header.

X-Frame-Options: ALLOW-FROM https://mydomain.com/

This header could be controlled in your backend server o directly in your F5 with an iRule.

when HTTP_RESPONSE {
	#X-Frame-Options
	HTTP::header insert X-Frame-Options "ALLOW-FROM https://mydomain.com/"
}

Regards,

Dario.

drodyc's avatar
drodyc
Icon for Nimbostratus rankNimbostratus
May 27, 2021

It seems as though our backend server guys would rather us have our BIG-IP to make this work as oppose there servers. I have tried the iRule below. The distant end users reported that it did not work. I used our backend server's URL and our distant end user's URL and both was unsuccessful. Is this iRule below is all I need or am I missing other lines? Should the 1st line be HTTP_RESPONSE or HTTP_REQUEST?

 

  1. when HTTP_RESPONSE {
  2. #X-Frame-Options
  3. HTTP::header insert X-Frame-Options "ALLOW-FROM https://mydomain.com/"
  4. }

 

Is it recommended to use this iRule below?

  1. when HTTP_RESPONSE {
  2. HTTP::header replace X-Frame-Options "SAMEORIGIN"
  3. }

 

Lastly, do I need to modify a DB value in CLI or is that only for APM? Thank you so much!