CVE-2014-7819 rubygem-sprockets: arbitrary file existence disclosure

Multiple directory traversal vulnerabilities in server.rb in Sprockets
before 2.0.5, 2.1.x before 2.1.4, 2.2.x before 2.2.3, 2.3.x before 2.3.3, 2.4.x
before 2.4.6, 2.5.x before 2.5.1, 2.6.x and 2.7.x before 2.7.1, 2.8.x before 2.8.3,
2.9.x before 2.9.4, 2.10.x before 2.10.2, 2.11.x before 2.11.3, 2.12.x before 2.12.3,
and 3.x before 3.0.0.beta.3, as distributed with Ruby on Rails 3.x and 4.x, allow
remote attackers to determine the existence of files outside the application root
via a …/ (dot dot slash) sequence with (1) double slashes or (2) URL encoding.