1

from what I understand a common approach to storing a CSRF token would be:

  1. the client retrieves from the server a CSRF token
  2. the token is stored in an input element inside the form like this:
<form>
<input type="hidden" name="token" value="abc123supersecrettoken"> 
</form>

my question is, would an attack like this be possible, and if so, how can a site be protected:

  1. user logins into facebook.com
  2. user goes to evil.com, the site has he following iframe:
<iframe src="https://www.facebook.com/changeUserPasswordForm"></iframe>
  1. with some basic DOM manipulation on the iframe, the CSRF token could be accessed by the attacker
1

would an attack like this be possible

This would not be possible. The Same Origin Policy prevents cross-origin reading. This applies also to an iframe from a different domain which is embedded in the current page.

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