[c-nsp] NTP DDoS

[Richard Clayton]

Nobody is safe now Jared :-)


On 13 February 2014 13:59, Jared Mauch <jared at puck.nether.net> wrote:

> Yeah, but I didn't mean for you to make that public :(
>
> - jared
>
> On Feb 13, 2014, at 5:10 AM, Nick Ryce <nick at fluency.net.uk> wrote:
>
> > You can check for open ntp servers within your AS with the following:-
> >
> > http://openntpproject.org/searchby-asn.cgi?search_asn=56595
> >
> > Swap 56595 for your ASN  :)
> >
> > Nick
> > On 13 Feb 2014, at 02:12, SilverTip257 <silvertip257 at gmail.com> wrote:
> >
> >> On Wed, Feb 12, 2014 at 2:36 PM, Alan Buxey <A.L.M.Buxey at lboro.ac.uk>
> wrote:
> >>
> >>>> Something I can point customers to for testing their own set ups. ;)
> >>>
> >>
> >> What I was trying to say is that openntp project URL is something I can
> >> point customers at and they should understand.  Some of my customers are
> >> dense.
> >>
> >> Sadly, a few of them try to tell me that information I give them doesn't
> >> work.  But when they say "hey, here's my credentials, why don't you fix
> it
> >> for me?" ... I come to find (yes, I'm a nice guy) that everything I sent
> >> them was spot on (as I expected).
> >>
> >> Copy+paste is over-rated.  o_O
> >>
> >>
> >>>
> >>> On a Linux or mac
> >>>
> >>> ntpdc -c monlist xxx.xxx.xxx.xxx
> >>>
> >>
> >> Yep.  And loopinfo and iostats commands.
> >>
> >> nmap has a ntp-monlist script that is helpful (combined with the
> grep-able
> >> output option).
> >>
> >> I'm about due for running another ntp-monlist scan ... [when DNS
> >> amplification attacks were real bad a few months ago, we told a
> customer to
> >> disable DNS recursion ... he instead shut off bind/named for that day
> and
> >> turned it back on some time later].
> >>
> >>
> >>>
> >>> If you get a reply (which will consist of a list of IP addresses that
> have
> >>> sync'd with the daemon) then the server has a non optimal config. ...
> and
> >>> if it's already been found by others they will all be listed. .. You
> might
> >>> even see openntp project and team cymru servers listed ;)
> >>>
> >>> Alan
> >>
> >>
> >>
> >>
> >> --
> >> ---~~.~~---
> >> Mike
> >> //  SilverTip257  //
> >> _______________________________________________
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> >
> > --
> > Nick Ryce
> >
> > Fluency Communications Ltd.
> > e. nick at fluency.net.uk
> > w. http://fluency.net.uk/
> > t. 0845 874 7000
> >
> >
> >
> >
> >
> > _______________________________________________
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>
>
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