You've been hacked: Now prevent future attacks

Thursday, 5 June 2003, 9:30 AM EST

In the aftermath of a network attack, you must act quickly to recover systems and prevent further attacks. In this article, we'll focus on long-range measures you can implement to strengthen your defences after the dust settles.

One of the main challenges in restoring systems is determining when those systems were compromised, how the systems were compromised, and what vulnerabilities were exploited to compromise them. The reality is that hackers rarely get in on their first attempt. They typically have to attempt to exploit a series of vulnerabilities or try a large number of username and password combinations before they find a crack in your systems' armour. Those attempts can, and often do, leave telltale fingerprints of the hacker trying to break down the doors. It's up to you to make sure that you record the attempts and that you have procedures or systems in place to notify you when an attack is being waged.

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