The Mystery of the HTTP Redirector and Site&Content Rules

You have created that huge destination set in order to block malicious sites. You think it is working great because Web Proxy clients can't access those sites. However, someday you discover that Firewall and SecureNAT clients still have access to those sites, despite the fact there is a proper Site&Content rule in place. If you want to know why this can happen, read on.

What You Need to Know About Intrusion Detection Systems

Firewalls and other simple boundary devices lack some degree of intelligence when it comes to observing, recognizing, and identifying attack signatures that may be present in the traffic they monitor and the log files they collect. Without sounding critical of such other systems’ capabilities, this deficiency explains why intrusion detection systems are becoming increasingly important in helping to maintain proper network security.

Analysis of Buffer Overflow Attacks

What causes the buffer overflow condition? Broadly speaking, buffer overflow occurs anytime the program writes more information into the buffer than the space it has allocated in the memory. This allows an attacker to overwrite data that controls the program execution path and hijack the control of the program to execute the attacker’s code instead the process code. For those who are curious to see how this works, we will now attempt to examine in more detail the mechanism of this attack and also to outline certain preventive measures.

Keeping IDS In-House

Many managers and network administrators believe that since they have a firewall constructed by security experts then they are protected from unwarranted attacks and can sleep well at night. Nothing could be further from the truth!

Kuda idiosz, IDS – What is going on with the IDS?

While looking through commercial offers for IDS products one may get the impression that in the near future, it will no longer be necessary to have an experienced administrator or security guru to monitor and maintain IT security systems. Already, the administrator’s role is seen as “a monkey with nothing better to do than push a flashing button”. Such a perception may be explained in terms of increasingly “intelligent” IDS solutions.

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