[ntp:hackers] query spikes seen in ntp traffic at ren-isac
hmurray at suespammers.org
Sat Mar 25 06:21:52 UTC 2006
> thanks to donald smith of qwest for this:
> i believe this means the bad guys know that ntp currently makes a good
> reflector, and it's only a matter of time before it's in the
I'm not sure that graph proves the bad guys are using NTP. Of course, this
handwaving doesn't prove they aren't, but here goes.
The base of the graph is 15000 rather than 0, so those gigantic spikes are
only 3x normal traffic.
The Netgear boxes that attacked UWisc:
Polls at one second intervals until it receives a response
from the NTP server, after which it uses a longer poll
interval such as one minute, ten minutes, two hours, or
24 hours, depending upon product model and firmware version.
(Just in case anybody hasn't seen it or wants a refresher:
Flawed Routers Flood University of Wisconsin Internet Time Server
The pool project sees a lot of abusive traffic. The typical pattern is 1
query per second from a host. I think most of that is a brain damaged
retransmission heuristics coupled with something like a firewall that is
blocking NTP traffic. (I don't have any real data to back that up. It's
just my memory/summary of various messages on the pool list.)
I think that sort of spiky graph could be generated by temporary outages of
an NTP server and/or routing to/from it.
If I'm right, the slope of the leading edges of the spikes should correspond
to the polling interval (assuming they aren't synchronized) and the trailing
slope should be one second (assuming no network or server losses from the
flood). But after the first spike they are all synchronized, so who knows...
It would be interesting to know more about the details of the traffic behind
that graph, especially the spikes.
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