NTP Mode 6 REQ_NONCE DRDoS Scanner

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Auxiliary::Report  
include Msf::Exploit::Remote::Udp  
include Msf::Auxiliary::UDPScanner  
include Msf::Auxiliary::NTP  
include Msf::Auxiliary::DRDoS  
  
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 distributed, reflected  
denial of service (aka, "DRDoS" or traffic amplification) via spoofed  
requests.  
},  
'Author' => 'Jon Hart <jon_hart[at]rapid7.com>',  
'References' =>  
[  
['CVE', '2013-5211'], # see also scanner/ntp/ntp_monlist.rb  
['URL', 'https://github.com/rapid7/metasploit-framework/pull/3696'],  
['URL', 'https://www.rapid7.com/blog/post/2014/08/25/r7-2014-12-more-amplification-vulnerabilities-in-ntp-allow-even-more-drdos-attacks/']  
],  
'DisclosureDate' => 'Aug 25 2014',  
'License' => MSF_LICENSE  
)  
end  
  
# Called for each response packet  
def scanner_process(data, shost, sport)  
@results[shost] ||= []  
@results[shost] << Rex::Proto::NTP::NTPControl.new.read(data)  
end  
  
# Called before the scan block  
def scanner_prescan(batch)  
@results = {}  
@probe = Rex::Proto::NTP::NTPControl.new  
@probe.version = datastore['VERSION']  
@probe.operation = 12  
end  
  
# Called after the scan block  
def scanner_postscan(batch)  
@results.keys.each do |k|  
response_map = { @probe => @results[k] }  
# TODO: check to see if any of the responses are actually NTP before reporting  
report_service(  
:host => k,  
:proto => 'udp',  
:port => rport,  
:name => 'ntp'  
)  
  
peer = "#{k}:#{rport}"  
vulnerable, proof = prove_amplification(response_map)  
what = 'R7-2014-12 NTP Mode 6 REQ_NONCE DRDoS'  
if vulnerable  
print_good("#{peer} - Vulnerable to #{what}: #{proof}")  
report_vuln({  
:host => k,  
:port => rport,  
:proto => 'udp',  
:name => what,  
:refs => self.references  
})  
else  
vprint_status("#{peer} - Not vulnerable to #{what}: #{proof}")  
end  
end  
end  
end  
`