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Defending Dos Attack

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Submitted By diaze05
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For years security folks have grumbled about the role compliance has assumed in driving investment and resource allocation in security. It has become all about mandates and regulatory oversight driving a focus on protection, ostensibly to prevent data breaches. We have spent years in the proverbial wilderness, focused entirely on the “C” (Confidentiality) and “I” (Integrity) aspects of the CIA triad, largely neglecting “A” (Availability). Given how many breaches we still see every week, this approach hasn’t worked out too well.
Regulators pretty much only care whether data leaks out. They don’t care about the availability of systems – data can’t leak if the system is down, right? Without a clear compliance-driven mandate to address availability (due to security exposure), many customers haven’t done and won’t do anything to address availability. Of course attackers know this, so they have adapted their tactics to fill the vacuum created by compliance spending. They increasingly leverage availability-impacting attacks to both cause downtime (costing site owners money) and mask other kinds of attacks. These availability-impacting attacks are better known as Denial of Service (DoS) attacks.
We focus on forward-looking research at Securosis. So we have started poking around, talking to practitioners about their DoS defense plans, and we have discovered a clear knowledge gap around the Denial of Service attacks in use today and the defenses needed to maintain availability. There is an all too common belief that the defenses that protect against run of the mill network and application attacks will stand up to a DoS. That’s just not the case, so this paper will provide detail on the attacks in use today, suggest realistic defensive architectures and tactics, and explain the basic process required to have a chance of defending your organization against a DoS attack.

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