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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.

ECN and it's impact on Intrusion Detection  12 January 2001 
Source: SANS / Toby Miller - Posted by Ryan W. Maple   
Recently, there has been some discussion on various mailing list(s) about the Explicit Congestion Notification (ECN) proposed standard and QUESO/nmap scan detection. The debate has been centered around the two reserve bits in the TCP header (bits 8 & 9) that . . .
Snort 1.7 Released  06 January 2001 
Source: - Posted by Dave Wreski   
Snort 1.7 has finally been released! Snort is an open source network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content . . .
Intrusion Detection: Be Afraid, Be Very Afraid  04 January 2001 
Source: TechWeb - Posted by Benjamin D. Thomas   
If you're not afraid about the state of your company's security, you should be. Hackers are scanning ports en masse, coordinated attacks are gaining popularity, and network users who appear to be valid are often impostors. And that's just outside attacks. . . .
IDS Evasion with Unicode  04 January 2001 
Source: Security Focus - Posted by Benjamin D. Thomas   
A thief obtains his prize by bypassing alarms and security systems that are in place. IDS evasion is no different. An attacker knows that the IDS will alarm on certain attack signatures and, therefore, will try to evade the IDS by . . .
Linux Intrusion Detection  03 January 2001 
Source: SysAdmin - Posted by Jen Olson   
One key to intrusion detection is understanding the most common security exploits. This knowledge will allow you to set up a checklist for periodic security checks of your system. If you're running a DNS server, BIND is a favorite target for . . .
New version of chkrootkit  25 December 2000 
Source: - Posted by Dave Wreski   
New version of chkrootkit (0.19) available... chkrootkit is a shell script mainly developed by Nelson Murilo (Brazilian) that checks for the existence of rootkits installed in your system... Tested on Linux 2.0, 2.2 (any distro), FreeBSD 2.2.x, 3.x and 4.0, OpenBSD . . .
The ABCs of IDSs (Intrusion Detection Systems)  14 November 2000 
Source: - Posted by Chris Pallack   
The basic function of an IDS is to record signs of intruders at work inside and to give alerts. Depending on the product, how it is deployed and its network configuration, an IDS may only scan for attacks coming from outside . . .
Watching the Watchers: Intrusion Detection  13 November 2000 
Source: Network Computing - Posted by Dave Wreski   
If you're one of the unfortunate souls who has been at ground zero during a high-impact security incident, you know the chaos that often ensues. When the big one hits, it can spawn teams of crazed administrators, flocks of delusional and . . .
Open Souce Tripwire Released  30 October 2000 
Source: Newsalert - Posted by Dave Wreski   
Tripwire, Inc., the leading provider of data and network integrity solutions, today announced the availability of its Open Source product for the Linux(R) operating system. "Tripwire Open Source, Linux Edition is a significant contribution of commercial-quality data and network integrity software . . .
Installing Snort 1.6.3 on SuSE 6.x-7.x  30 October 2000 
Source: LinuxNewbie - Posted by Dave Wreski   
Here's a quick startup guide for using snort. You might also be interested in the "Using Snort" guide. "Snort is a lightweight network intrusion detection system, capable of performing real-time traffic analysis and packet logging on . . .
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