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Intrusion Detection
We have thousands of posts on a wide variety of open source and security topics, conveniently organized for searching or just browsing.

Intrusion Software Maker Snorts At Security Alert  30 January 2002 
Source: Newsbytes - Posted by Dave Wreski   
The developer of Snort, a popular open-source intrusion detection system (IDS), downplayed reports of a security flaw that could enable attackers to disable the software. According to an alert released Monday by Internet Security Systems (ISS), Snort versions 1.8.3 and earlier are susceptible to a denial of service attack.. . .
Understanding IDS Active Response Mechanisms  29 January 2002 
Source: - Posted by Derrick Lewis   
Debates still rage in the developer community over which methods of detecting attackers are best, but IDS customers as a whole are satisfied with the current IDS technology. To get an edge on the competition, many of the IDS vendors are . . .
The Perfect Forensics Candidate  14 January 2002 
Source: ComputerWorld - Posted by Dave Wreski   
This is a great multi-part article on computer forensics, the story of a couple of break-ins and how they were detected, and the tools used to detect the attacks. "Exodus Communications Inc. has a team of 22 incident response analysts, and it can always use a few more people with expertise in the field to support internal and client investigations.. . .
Snort-Setup for Statistics HOWTO  04 January 2002 
Source: Sandro Poppi - Posted by Dave Wreski   
This HOWTO describes how to configure Snort version 1.8.3 to be used in conjunction with the statistical tools ACID (Analysis Console for Intrusion Databases) and SnortSnarf. It also intends to get some internal statistics out of snort, e.g. if there are packets dropped. . . .
Snort 'n Dragon  26 December 2001 
Source: O'Reilly Network - Posted by Pete O'Hara   
This is the third in a series of excerpts from Chapter 7 of Incident Response, published in August 2001 by O'Reilly. This excerpt covers two tools used by sysadmins to detect when hackers are trying to access your network. You can use these tools to detect hackers before they do any damage.. . .
SNARE: Host-Based Linux Intrusion Detection  11 December 2001 
Source: 8wire - Posted by Jen Olson   
Perhaps one reason that Linux hasn't become more prominent in the corporate world has been its lack of sophisticated host-based intrusion detection systems (IDSs). There are many Linux IDSs in use that are network-based, meaning that they attempt to detect intrusions . . .
Fireproofing Against DoS Attacks  09 December 2001 
Source: NWC - Posted by Dave Wreski   
The first method of stopping a DoS attack is simply to drop all traffic related to the target hosts. This is a good tactic for a nonessential protocol, like ICMP (Internet Control Message Protocol), but dropping TCP or UDP (User Datagram . . .
A New Twist in Computer Security Tools  07 December 2001 
Source: BusinessWeek - Posted by Jen Olson   
Called intrusion-detection systems (IDS), these programs serve as active sentries on a network or a desktop, sniffing out what could be signs of unauthorized activity and alerting either the PC owner or a network administrator. They trace their roots back to . . .
Open source mounts IDS challenge  04 December 2001 
Source: vnunet - Posted by Dave Wreski   
Open source security products are ready to mount a massive challenge in the intrusion detection market, according to experts. Security consultant NSS Group tested 16 IDS products from big vendors including Cisco, ISS, Computer Associates and Symantec, along with one freeware open source product called Snort.. . .
SANS Intrusion Detection FAQ  03 December 2001 
Source: SANS - Posted by Dave Wreski   
This document provides a great starting point for those interested in intrusion detection. "ID stands for Intrusion Detection, which is the art of detecting inappropriate, incorrect, or anomalous activity. ID systems that operate on a host to detect malicious activity on . . .
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