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I have a question about Clickjacking.

The question is quite simple. Imagine a login flow like this:

  1. You visit the application login page, eg https://example.com/login.html. There is no Clickjacking protection (i.e. the X-Frame-Options header) on this page.
  2. This page redirects you to the SSO page to actually login, e.g. https://sso.service.com and the actual credentials are entered here. Clickjacking protection is enabled here.
  3. After logging in you are redirected back to the site, https://example.com/home.html. There is no clickjacking protection anywhere on the site.

My question is: if I have protection on the login/SSO page alone and don't have protection in any other page of the application, is my application still vulnerable to Clickjacking?

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The answer is simple and straight-forward:

Having clickjacking protection only on the login page only protects the login page. The rest of your site is still vulnerable

It sounds like you have a bit of a misunderstanding, and are hoping that because the login page is clickjacking-protected, someone can't use clickjacking to attack your site. Unfortunately that is not the case. Clickjacking (typically) relies upon using the credentials of an already-logged in user. As a result, there is no need to target the login page with clickjacking. Rather, you target any other page that has a sensitive action.

In fact, the login page is probably low on the list of pages that need clickjacking protection. The reason is because you can't use clickjacking to enter a password, nor would an attacker know the user's password to log them in even if it was possible. It might be possible to use clickjacking on a login page to login a user if the browser stores the password and suggests it automatically, and then follow that up with a clickjacking attack on another action on the site, therefore building up an exploit from multiple clickjacking attacks. In general though, using clickjacking against a login page is probably not an interesting target in-and-of itself.

As a result, you pretty much have things backward: if you had everything but your login page protected from clickjacking, you'd probably be fine. If you only have your login page protected from clickjacking, then your clickjacking protection is useless.

  • Thanks Connor for the explanation. Now I have one more doubt.. Basically Clickjacking targets for sensitive information on post login. In real time scenario when you perform Clickjacking it will send as a forged request, but I have a protection for csrf. How Clickjacking gets exploited? – Bhuvanesh Kumar Sep 12 at 2:32

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