[Discuss] NTP Gone Crazy?

[nican at WPI.EDU (Henrique)]

This Wikipedia article has a few good stories:

http://en.wikipedia.org/wiki/NTP_server_misuse_and_abuse


On Sat, Jan 11, 2014 at 9:15 PM, Chuck Anderson <cra at wpi.edu> wrote:

> Probably you were used in an NTP reflection DDoS attack.
>
> The problem is the "monlist" command that ntpd provides.  Upgrade to
> ntp-4.2.7 which removes that command, and/or add "noquery" to your
> default restrict config.
>
>
> http://www.symantec.com/connect/blogs/hackers-spend-christmas-break-launching-large-scale-ntp-reflection-attacks
>
> On Sat, Jan 11, 2014 at 09:09:13PM -0500, Kent Borg wrote:
> > I remember a story from the early days of the internet (maybe
> > ARPANET at that point) when there was a bug in NTP and, for a time,
> > it was most of the traffic on the internet...
> >
> > Anyway, last night my internets at home were working normally, but
> > this morning they were crappy.  I went out and when I got home they
> > were still crappy.  I assumed it was Verizon's fault, what with
> > their unmaintained copper wires...but that wasn't it Verizon this
> > time.
> >
> > My NTP daemon went crazy.
> >
> > I have an ancient (Ubuntu 7.04) basement server that does very basic
> > things, roughly:
> >
> >  - DHCP server,
> >  - QEMU host for three little virtual machines, and
> >  - NTP client/server.
> >
> > When I called my DSL provider to complain I was told that I was
> > pegging my upstream bandwidth.  Huh??
> >
> > After poking around I finally isolated it: NTP.  Turn it on and my
> > first-hop-ping jumps from a dozen-ish ms to several hundred-ish ms.
> > Turn it off and the ping times fall back to dozen-ish ms.
> >
> > I tried commenting out half my "server" entries in my /etc/ntp.conf
> > file: same thing.  I tried commenting out all of the "server"
> > entries and still the same thing.
> >
> > Am I just dying of bit rot?  Something gone bad in my ntp binary??
> >
> > Ideas?
> >
> >
> > Thanks,
> >
> > -kb, the Kent who figures it is a sign from God to build a new
> > basement server.
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