By Robert Vamosi
Defense in Depth
June 7, 2008
On Friday, Internet movie database IMDB fell victim to a sustained
distributed denial-of-service (DDoS) attack that coincided with
Amazon.com being offline, says one researcher.
Soups Ranjan, a senior member of the technical staff of network
protection and management company Narus, said in a blog that he found
evidence that at least one of the IP addresses used by IMDB fell under a
sustained DDoS attack between 10:30 a.m. and 1:30 p.m. PDT Friday.
"My attempt to load the IMDB page via a direct connection to the Web
server under attack (http://188.8.131.52/) doesn't load the images at
all. It becomes interesting when you realize that IMDB seems to be
hosted using Amazon Web Service (AWS) since this IP-address is
registered as belonging to Amazon."
Ranjan noted that the duration of the attack on IMDB coincided with the
amount of time that Amazon was offline on Friday.
He also provided some details, saying that "the attacker seemed to open
multiple connections with the IMDB's Web server (port 80) while
incrementing his source port for every new connection. The attack's
average rate was 3Mbits/sec, certainly not large enough to cause a
complete meltdown but probably good enough to delay the legit users.
However, there might have been other attacks launched at the same time
on IMDB which weren't in the path of our probes."
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