Upload
claire-spencer
View
215
Download
0
Embed Size (px)
Citation preview
Denial of Service AttackDenial of Service Attack
발표자 : 전지훈
What is Denial of Service Attack?What is Denial of Service Attack?
Denial of Service Attack = DoS Attack
Service attacks on a Web server floods it with bogus requests for pages.
The server spends so much time trying to process these requests that it can't respond to legitimate requests and may crash.
Goal of DoSGoal of DoS
To flood a network, thereby preventing legitimate network traffic
To Disrupt connections between machines, thereby preventing access to a service
To prevent a particular individual from accessing a service
To disrupt service to a specific system or person
DoS Attack does…DoS Attack does…
Consumption of computational resources, such as bandwidth, disk space, or processor time
Disruption of configuration information, such as routing information.
Disruption of state information, such as unsolicited resetting of TCP sessions.
Disruption of physical network components. Obstructing the communication media
between the intended users and the victim so that they can no longer communicate adequately
Symptoms of DoS AttackSymptoms of DoS Attack
Unusually slow network performance
Unavailability of a particular web site
Inability to access any web site
Dramatic increase in the number of spam emails received
Prevention of DoS AttackPrevention of DoS Attack
Firewalls
Switches
Routers
Intrusion-prevention systems (IPS)
DDoS AttackDDoS Attack
Distributed Denial of Service Attack
Multiple compromised systems flood the bandwidth or resources of a targeted system, usually one or more web servers
DDoS AttackDDoS Attack
Attacker
Master(Handler)
Agent
Master(Handler)
Master(Handler)
AgentAgent AgentAgent Agent Agent
Target
Advantages of DDoS AttackAdvantages of DDoS Attack
Multiple machines can generate more attack traffic than one machine
Multiple attack machines are harder to turn off than one attack machine
Behavior of each attack machine can be stealthier, making it harder to track down and shut down
ReferenceReference
http://en.wikipedia.org/wiki/DoS
http://www.cert.org/
Any Question?
Thank You.