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i used to code my pages in php, and am new to ror. recently i read this article: http://asciicasts.com/episodes/204-xss-protection-in-rails-3
about the xss protection and im curious, whether this only applies to output like js on a html page, or whether this ruby feature also covers sql injection, <img src="evilpage.php"/> session stealing and others?
Cross-site scripting (XSS) and SQL injection are two entirely different things, but using ActiveRecord properly in Rails 3 will also protect you from SQL injection.
Cross-site request forgery (CSRF, ‘session stealing’) is something totally different again.