Ruby on Rails 'unicode strings' Cross-Site Scripting Vulnerability

Summary
This host is running Ruby on Rails and is prone to cross-site scripting vulnerability.
Impact
Successful exploitation will allow attackers to execute arbitrary HTML and script code in a user's browser session in context of an affected site. Impact Level: Application
Solution
Upgrade to Ruby on Rails version 2.2.3 or 2.3.4 or later. For updates refer to http://rubyonrails.org/download
Insight
The flaw is due to error in handling of 'escaping' code for the form helpers, which does not properly filter HTML code from user-supplied input before displaying the input.
Affected
Ruby on Rails version 2.x before to 2.2.3 and 2.3.x before 2.3.4
References