I've decided to develop SafeClick module few weeks after the discussion with Drupal Security Team about possible vulnerabilities to Clickjacking attacks. Security Team replied that protection of this class of attacks won't be implemented in core, so I've decided to develop a special module for it. More information about Clickjacking can be found at http://www.sectheory.com/clickjacking.htm.
Currently, there is no similar module available for Drupal or any other CMS. Development of this module provides Drupal with new level of security, which is not comparable to any other CMS. Number of clickjacking attacks increases - Bikini worm at Facebook and huge number of attacks on Twitter, so this module is definitely needed for many websites. High level of attention to Drupal as a governmental site (like www.whitehouse.gov), a social network with Twitter integration - all of this should get the best of secure practice.
This module implements several techniques of Clickjacking prevention, which were discussed long at http://sla.ckers.org with specialists in Web Applications Security sphere. I think they got to be reviewed by Drupal Security Team, and if they have any questions, I'll certainly explain everything.
The first technique is implementation of X-Frame-Options HTTP header. This header defines, how browser should process framing of website. It has two options: SAMEORIGIN, when browser accepts framing within website domain and DENY, when browser rejects any attempt of framing. This header is currently supported by NoScript, Safari, Chrome and IE8, so it's the best way to prevent Clickjacking.