71 lines
2.0 KiB
Ruby
71 lines
2.0 KiB
Ruby
##
|
|
# This module requires Metasploit: http//metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
|
|
class Metasploit3 < Msf::Auxiliary
|
|
|
|
include Msf::Auxiliary::Report
|
|
include Msf::Exploit::Remote::Udp
|
|
include Msf::Auxiliary::UDPScanner
|
|
include Msf::Auxiliary::NTP
|
|
|
|
def initialize
|
|
super(
|
|
'Name' => 'NTP Mode 6 REQ_NONCE DRDoS Scanner',
|
|
'Description' => %q{
|
|
This module identifies NTP servers which permit mode 6 REQ_NONCE requests that
|
|
can be used to conduct DRDoS attacks. In some configurations, NTP servers will
|
|
respond to REQ_NONCE requests with a response larger than the request,
|
|
allowing remote attackers to cause a denial of services (traffic
|
|
amplification) via spoofed requests.
|
|
},
|
|
'References' =>
|
|
[
|
|
],
|
|
'Author' => 'Jon Hart <jon_hart[at]rapid7.com>',
|
|
'License' => MSF_LICENSE
|
|
)
|
|
end
|
|
|
|
# Called for each IP in the batch
|
|
def scan_host(ip)
|
|
scanner_send(@probe, ip, datastore['RPORT'])
|
|
end
|
|
|
|
# Called for each response packet
|
|
def scanner_process(data, shost, sport)
|
|
@results[shost] ||= []
|
|
@results[shost] << Rex::Proto::NTP::NTPControl.new(data)
|
|
end
|
|
|
|
# Called before the scan block
|
|
def scanner_prescan(batch)
|
|
@results = {}
|
|
@probe = Rex::Proto::NTP::NTPControl.new
|
|
@probe.version = 2
|
|
@probe.operation = 12
|
|
vprint_status("Sending probes to #{batch[0]}->#{batch[-1]} (#{batch.length} hosts)")
|
|
end
|
|
|
|
# Called after the scan block
|
|
def scanner_postscan(batch)
|
|
@results.keys.each do |k|
|
|
packets = @results[k]
|
|
report_service(
|
|
:host => k,
|
|
:proto => 'udp',
|
|
:port => rport,
|
|
:name => 'ntp'
|
|
)
|
|
|
|
total_size = packets.map(&:size).reduce(:+)
|
|
if packets.size > 1 || total_size > @probe.size
|
|
print_good("#{k}:#{rport} NTP req_nonce request permitted with amplified response (#{packets.size} packets, #{total_size} bytes)")
|
|
end
|
|
end
|
|
end
|
|
end
|