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Re: UDP port 80 DDoS attack
From: Fredrik Holmqvist / I2B <fredrik () i2b se>
Date: Mon, 06 Feb 2012 00:47:11 +0100


We had a customer that was attacked by the same "game server feature".
We received aprox 10 Gbit of traffic against the customer.

The attacker sends spoofed packets to the game server with the target
IP as "source", the gameserver sends replies back via UDP to the target
host. The attacker sends a couple of hundred packets per second and thus
generating a 10 Mbit UDP flood.

There is fixes/workarounds for the game servers, just a matter of the
admin taking care of it.
See: http://rankgamehosting.ru/index.php?showtopic=1320

The "attacking" IPs aren't spoofed, so just compile a list and send
e-mails to each provider.

We had 1000+ IPs gathered and sent 100+ abuse e-mails, only received
reply from less than 20%.
Sad that people care so little about mitigating DDoS/UDP/ICMP floods.

On Sun, 5 Feb 2012 18:36:13 -0500, Ray Gasnick III
<rgasnick () milestechnologies com> wrote:
We just saw a huge flux of traffic occur this morning that spiked one
of our upstream ISPs gear and killed the layer 2 link on another
becuase of a DDoS attack on UDP port 80.

Wireshark shows this appears to be from a compromised game server
(call of duty) with source IPs in a variety of different prefixes.

Only solution thus far was to dump the victim IP address in our block
into the BGP Black hole community with one of our 2 providers and
completely stop advertising to the other.

Anybody see this recently and have any tips on mitigation,  reply on
or off list.

Thank You,

Ray Gasnick III
CISSP, Technology Specialist: Network Security & Infrastructure
Miles Technologies

Phone: (856) 439-0999 x127
Direct: (856) 793-3821
How am I doing?  Email my manager at
itmanager () milestechnologies com<mailto:itmanager () milestechnologies com>

Computer Networking – IT Support – Business Software – Website Design
– Online Marketing & PR

Fredrik Holmqvist
I2B (Internet 2 Business)
070-740 5033

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