[cod] "reflection attacks" ... cod servers exploited ?

[STIPE Admin]

I am too experiencing a similar issue. I'm unsure if this is a reflection
attack but all my COD servers are acting like BOTNETs - that is, it seems to
be DOS attacking targets at high speeds. So far I have been banning multiple
IP addresses a day manually but it's hard to keep up as new IPs form up
every hour. Has anyone found a solution to this yet? I use Windows to run my
COD servers btw.

 

 

 

From: Marco Padovan [mailto:evolutioncrazy at gmail.com] 
Sent: Wednesday, 19 January 2011 12:51 AM
To: Call of Duty server admin list.
Subject: Re: [cod] "reflection attacks" ... cod servers exploited ?

 

We are getting hit HARD (.eu)

I dunno what's the tool you are referring to... could you please mail me
some references privately so I can analyze it?

Basically we are currently dealing on a daily basis with this kind of
attacks since december ...

We find ourself handling 10k incoming spoofed packets per second during
certain times of the day...

What are you referring to small flow? 1k/sec? 100packets/sec?
Which kind of rate limiting figures did you all applied?
We are trying to defend our self with very very strict network filters...
but that's damaging also our services that certain times appear unreachable
(even if they are not)

In our case it looks like it's not just against other gameservers... but
also against random hosts...
Source packets sometimes are from port 80 udp and, if not blocked, replies
would do an udp flood to the poor host if enough gameservers were
involved... (even if no udp service was running on port 80) :(

The worst thing is that the damage to us as "reflectors" is very low as we
are used to handle a shitload of packets so it's difficult to say if there's
an attack going on or not :/

Additionally, as I'm providing services to different GSP brands in different
countries, I found out that attacks are basically spread on ALL the
servers... using all the servers available on the master list as reflectors
and targeting only a little number of victims... they are not exploiting
just a single GSP / gameserver :|


Il 18/01/2011 07:51, John ha scritto: 

On 1/17/2011 10:44 PM, Geoff Goas wrote: 



John, you've seen an increase in attacks on victims or you are seeing your
servers being used as reflection servers? 

How are you detecting either/or? 


Both. As a victim, from traffic dumps made during large (D)DoS attacks and
from received complaints by the IP owners at other GSPs that have been
concurrent with the attacks on our clients. A a reflector is from a
complaint; it's more difficult to detect those from the side of the server
being used as the reflector because the flow is small. 

-John 
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