CVE-2014-0082 rubygem-actionpack: Action View string handling denial of service

actionpack/lib/action_view/template/text.rb in Action View in Ruby on
Rails 3.x before 3.2.17 converts MIME type strings to symbols during use of the
:text option to the render method, which allows remote attackers to cause a denial
of service (memory consumption) by including these strings in headers.