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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.



ISS Report: Remote Denial of Service Vulnerability in Snort IDS  31 January 2002 
Source: xforce.iss.net - Posted by Benjamin D. Thomas   
Internet Security Systems (ISS) X-Force is aware of a remote Denial of service (DoS) vulnerability present in Marty Roesch's Snort Intrusion Detection System (IDS). It may be possible for remote attackers to send specially crafted ICMP packets to the program, resulting . . .
 
Snort sniffs at security scare  31 January 2002 
Source: VNUNet - Posted by Benjamin D. Thomas   
A spat has broken out in the security community after Internet Security Systems (ISS) revealed a security flaw in the Snort open source intrusion detection system. ISS released an advisory warning on Monday of a remote denial of service (DoS) . . .
 
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: SecurityFocus.com - 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 . . .
 
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