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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.

Penetration Testing Exposed  08 February 2001 
Source: InfoSecurity Magazine - Posted by Dave Wreski   
Part three of our series on "Audits, Assessments & Tests (Oh, My)" explores penetration testing, the controversial practice of simulating real-world attacks by discovering and exploiting system vulnerabilities. We are routinely deluged with news reports detailing the exploits of attackers who . . .
Attacking DoS Attacks  06 February 2001 
Source: TechWeb - Posted by Dave Wreski   
To combat such attacks on routers, a new company called Arbor Networks Inc.-funded by Cisco Systems Inc. (stock: CSCO) and Intel Corp. (stock: INTC)-this week will launch a managed availability service that aims to detect, trace, and block DoS attacks.. . .
RazorBack v0.1 - SNORT Intrusion Detection Front-End  06 February 2001 
Source: InterSect - Posted by Dave Wreski   
RazorBack is a log analysis program that interfaces with the SNORT open source Intrusion Detection System to provide real time visual notification when an intrusion signature has been detected on the network. RazorBack is designed to work within the GNOME 1.2 . . .
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 . . .
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