File dns-random-txid
Script types:
portrule
Categories:
external, intrusive
Download: http://nmap.org/svn/scripts/dns-random-txid.nse
User Summary
Checks a DNS server for the predictable-TXID DNS recursion vulnerability. Predictable TXID values can make a DNS server vulnerable to cache poisoning attacks (see CVE-2008-1447).
The script works by querying txidtest.dns-oarc.net (see https://www.dns-oarc.net/oarc/services/txidtest). Be aware that any targets against which this script is run will be sent to and potentially recorded by one or more DNS servers and the txidtest server. In addition your IP address will be sent along with the txidtest query to the DNS server running on the target.
Example Usage
nmap -sV --script=dns-random-txid <target>
Script Output
PORT STATE SERVICE REASON 53/udp open domain udp-response |_dns-random-txid: X.X.X.X is GREAT: 27 queries in 61.5 seconds from 27 txids with std dev 20509
Requires
Author: Script: Brandon Enright <bmenrigh@ucsd.edu>
txidtest.dns-oarc.net: Duane Wessels <wessels@dns-oarc.net>
License: Same as Nmap--See http://nmap.org/book/man-legal.html
