This indicates an attack attempt to exploit a Directory Traversal and Arbitrary Command Execution Vulnerability in Ruby on Rails.
The vulnerability is due to the application passing unverified user input to the `render` method in a controller. A remote attacker could exploit this to execute arbitrary code execution within the context of the application, via a crafted HTTP request.
Ruby on Rails all versions prior to 5.0.0.beta1.1, 184.108.40.206, 220.127.116.11, and 18.104.22.168
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the update available from the website