DNS (Domain Name Services) is explained at wikipedia
Sans reported that a vulnerability in DNS leaves it susceptable to DNS Cache Poisoning.
How does DNS work?
How is DNS vulnerable to DNS Cache Poisoning?
How can DNS Cache Poisoning be prevented?
How can DNS Cache Poisoning be detected?
How do you respond to DNS Cache Poisoning?
Security Focus reports that a number of distributions of Linux are still susceptible to a fork attack
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