| Current Path : /usr/local/share/nmap/scripts/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/local/share/nmap/scripts/dns-test-open-recursion.nse |
id = "Nameserver open recursive queries (CVE-1999-0024) (BID 136, 678)"
description = "Checks if a nameserver on UDP/53 allows queries for third-party names. It is expected that recursion will be enabled on your own internal nameservers."
author = "Felix Groebert <felix@groebert.org>"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default", "intrusive"}
require "bit"
require "comm"
require "shortport"
portrule = shortport.portnumber(53, "udp")
action = function(host, port)
-- generate dns query, Transaction-ID 0xdead, www.wikipedia.org (type A, class IN)
local request = string.char(0xde, 0xad, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03) .. "www" .. string.char(0x09) .. "wikipedia" .. string.char(0x03) .. "org" .. string.char(0x00, 0x00, 0x01, 0x00, 0x01)
local status, result = comm.exchange(host, port, request, {proto="udp"})
if not status then
return
end
-- parse response for dns flags
if (bit.band(string.byte(result,3), 0x80) == 0x80
and bit.band(string.byte(result,4), 0x85) == 0x80)
then
return "Recursion appears to be enabled"
end
return
end