Tuesday, February 3. 2009
Cloud computing becomes more and more popular. And it's cool, indeed. With Amazon webservices such as EC2, SimpleDB, S3 etc. or Google App Engine it is possible to build scalable web applications easily. Even self-scalable applications. Since AWS is completely based on web services not just for usage but for resource management also it should be possible to build an application detecting load peaks and starting up new nodes - all automatically.
Unfortunately, this cool technical feature also adds new attack vectors for black heads. New attacks may be based on the pricing model which is "pay only for what you use". But, exacly that. Scince your application spreads automatically over an arbitrary number of new nodes and consumes an unlimited amount of resources attackers do not need to DDoS your application but just to run a DDoP. This is a "Distributed Denial of Payment" attack.
Their bot nets just need to use the application the ordinary way. As load grows your resource usage grows and the same does your depts.
There is a reason why startups use open source software, PostgreSQL for example, and not an Oracle with a per processor license. The same reason may let them choose a hosting solution where they pay what they have and not what they use. A startup company may soon reach the financial limits in a DDoP condition. So read my lips: don't miss to add some kind of throttle and a good bot and crawler detection when you enter the cloud.
You may also read this article about "Cost Allocation" as a new computing resource affecting algorithms:
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