/usr/share/chef-server-webui/app/controllers/ is in chef-server-webui 10.12.0+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/chef-server-webui/app/controllers/application.rb
/usr/share/chef-server-webui/app/controllers/clients.rb
/usr/share/chef-server-webui/app/controllers/cookbooks.rb
/usr/share/chef-server-webui/app/controllers/databag_items.rb
/usr/share/chef-server-webui/app/controllers/databags.rb
/usr/share/chef-server-webui/app/controllers/environments.rb
/usr/share/chef-server-webui/app/controllers/exceptions.rb
/usr/share/chef-server-webui/app/controllers/main.rb
/usr/share/chef-server-webui/app/controllers/nodes.rb
/usr/share/chef-server-webui/app/controllers/openid_consumer.rb
/usr/share/chef-server-webui/app/controllers/roles.rb
/usr/share/chef-server-webui/app/controllers/search.rb
/usr/share/chef-server-webui/app/controllers/search_entries.rb
/usr/share/chef-server-webui/app/controllers/status.rb
/usr/share/chef-server-webui/app/controllers/users.rb