[ntp:questions] better rate limiting against amplification attacks?
agcarver+ntp at acarver.net
Thu Jan 9 03:26:37 UTC 2014
On 1/8/2014 18:31, William Unruh wrote:
> On 2014-01-09, A C <agcarver+ntp at acarver.net> wrote:
>> Here's a live amplification attack at work.
>>> As I wrote in another post I believe the time is ripe for a sensible
>>> default builtin configuration, which can then be overridden with ntp.conf.
>>> You suggestion in your previous message is very similar to what I
>>> wanted, i.e. the default is to have a pure client using the pool.
>>> As soon as you start writing detailed ntp.conf options I want you to
>>> have the ability to shoot yourself in the foot, if that is your wish.
> But this sounds like it is shooting someone else in the foot. That is
> more serious. Ie, the default is that you should have to work quite hard
> to enable the system to run these amplification attacks (I assume that
> this is using the control system to send control/info packets, rather
> than ntp time protocol packets)
It is unclear (or, more correctly, not publicly documented yet) whether
the attack used the monlist function (outlined in a CERT advisory in
December) or some other method utilizing NTP protocols. But it was
enough of an attack to cripple the gaming servers for some time.
More information about the questions