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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.



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 . . .
 
The Evolution of Intrusion Detection Systems  20 November 2001 
Source: Security Focus - Posted by Benjamin D. Thomas   
Network intrusion detection deals with information passing on the wire between hosts. Typically referred to as "packet-sniffers," network intrusion detection devices intercept packets traveling along various communication mediums and protocols, usually TCP/IP. Once captured, the packets are analyzed in a number . . .
 
Sifting Through Data to Detect New Attacks  14 November 2001 
Source: Boardwatch - Posted by Benjamin D. Thomas   
The problem is that intelligence and law enforcement agencies are searching the world's biggest haystack -- untold exabytes, or quintillions of bytes of data stored on computers across the globe -- to uncover a few very dangerous needles. "If we wanted . . .
 
Analysis of SSH crc32 compensation attack detector exploit  11 November 2001 
Source: David A. Dittrich - Posted by Dave Wreski   
On October 6, 2001, intruders originating from network blocks in the Netherlands used an exploit for the crc32 compensation attack detector vulnerability to remotely compromise a Red Hat Linux system on the UW network running OpenSSH 2.1.1. David Dittrich thoroughly analizes the attack as it happened on a network for which he is responsible.. . .
 
DoS Attacks: Easier To Launch, Harder to Fight  07 November 2001 
Source: osOpinion - Posted by Jen Olson   
DoS attackers are relying more on automated tools, which lower the level of technical knowledge necessary to launch a successful attack. Experts are warning that crippling denial of service (DoS) attacks have become easier to launch, with automated tools and newer methods that tie up more computer and Internet resources than ever.. . .
 
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