It is possible to receive an error after updating wpscan via “svn up” complaining about the nokogiri gem. This might be confusing because likely you already have the nokogiri gem installed on Backtrack Linux however it is likely a simple path issue. To resolve you can issue the below gem install –user-install command as shown in the below example.
One of my favorite apps in Backtrack Linux that I recently discovered is wpscan. There are a ton of WordPress sites in the wild and using wpscan is an excellent way to begin an audit on a WP site. There are a couple things that wpscan does that is really amazing such as enumerating logins from WordPress sites and enumerating WordPress plugins that are installed. Below are a couple examples of how wpscan can be useful for WordPress web site analysis.