Linux Network Security - Page 70

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Smurf attacks - don't be a victim

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Smurf attacks can be devastating, both to the victim network and to the network(s) used to amplify the attack. An Internet Control Message Protocol (ICMP) Smurf attack is a brute-force attack on the direct broadcast feature that is built in to . . .

Anthony Pell
Jan 10, 2002

MailScanner Mail Gateway Filter

MailScanner is a virus scanner for e-mail designed for use on e-mail gateways. It can also detect a large proportion of unsolicited commercial e-mail (spam) passing through it. Not only can it scan for known viruses, but it can also protect . . .

Anthony Pell
Jan 09, 2002

Comparing Secure shell (SSH) and Virtual Network Computing (VNC)

In the first of this pair of articles, David compares and contrasts Secure shell (SSH) and Virtual Network Computing (VNC), two technologies that allow a user at one workstation to run an application that lives on another computer. (He does not . . .

Anthony Pell
Jan 08, 2002

Securing Air (Wireless Security)

He brought along a laptop loaded with a wireless Ethernet card and NetStumbler, a shareware sniffer for wireless networks. Once NetStumbler detects an 802.11 connection, it logs the MAC address of the access point along with the network name, SSID, manufacturer and various data about the signal. The software also logs whether WEP is enabled, though it doesn't attempt to crack WEP-encoded packets.. . .

Anthony Pell
Jan 07, 2002

Escape from data Alcatraz

"There are two ways to attack a data centre very quickly," says Richard Brown solemnly, as he leads the way through the dead mans zone. "The first is to kill the power, and the second is to attack the air conditioning." . . .

Anthony Pell
Dec 28, 2001

Security consultant finds plenty of holes to plug

Cruising about the Twin Cities, with his wireless laptop on the seat next to him, Brad Rubin can see one business opportunity after another pop up on his computer screen. His laptop, hooked to a homemade antenna housed in a Pringles can, runs sniffer software that detects wireless networks, even those people have tried to hide.. . .

Anthony Pell
Dec 26, 2001

Hackers surround the Honeynet like bees around a honey pot

A decoy computer network set up to record every attempt to crack it open and subvert it has revealed just how active and determined malicious hackers have become. Statistics gathered by the network show that computers connected to the web are . . .

Anthony Pell
Dec 26, 2001

VNC, Securely: Part 2

This article will use Linux computers as both the clients and the server. We will concentrate on using the VNC client called vncviewer and the OpenSSH implementation of the SSH Secure Shell protocol. As per the first article, we have . . .

Anthony Pell
Dec 24, 2001

Wireless Security Isn't Secure

You would have to be living in a cave not to have heard about the problems with wireless security for networking. Even as more organizations (and homes) take advantage of wireless networking, we hear about "war driving" and that the security features were poorly designed.. . .

Anthony Pell
Dec 19, 2001

DoS attacks could soon meet their match

Denial of service (DoS) attacks, the scourge of the internet, and an effectively unstoppable menace, may soon meet their match. A security team based at the Southern California Information Sciences Institute (ISI), has developed a system to combat the DoS threat. . . .

Anthony Pell
Dec 19, 2001

monitord: network security monitor

A lightweight (distributed?) network security monitor for TCP/IP+Ethernet LANs. It will capture certain network events and record them in a relational database. The recorded data will be available for analysis through a CGI based interface. . . .

Anthony Pell
Dec 18, 2001

Wireless LAN security fix proposed

Network managers worried about the security of their wireless LANs may soon be able to sleep a little easier. The standards committee responsible for the broken wireless LAN encryption algorithm, Wired Equivalent Protocol, has approved a fix to the system which . . .

Anthony Pell
Dec 18, 2001

Is Linux Immune to E-Mail Viruses?

Some of the recent press regarding the "Goner" e-mail virus has brought about interesting commentary from antivirus manufacturers. It seems that a number of these folks feel that Linux viruses soon will be rampaging through the Internet alongside their Windows brethren. . . .

Anthony Pell
Dec 17, 2001

Setting up a VPN Gateway

How to install and run an IPSec-based VPN gateway with a firewall using a single bootable Linux diskettedistribution. A virtual private network (VPN) is a tool that enables the secure transmission of data over untrusted networks such as the Internet. . . .

Anthony Pell
Dec 13, 2001

Ten Days to Network Security

This August 2001 article answers the questions, "What would you do if you were given ten days to secure your network?" You're a new LAN administrator and you been given the charge of "securing" the network. What would be the most . . .

Anthony Pell
Dec 12, 2001

Swatting Persistent Security Pests

Bloodsuckers swarm the Internet too, and three in particular bite networkers again and again: wireless vulnerabilities, Denial of Service (DoS) attacks, and worms. These threats persist for several reasons, including an abundance of automated attack tools, egregious technology failures, and sometimes . . .

Anthony Pell
Dec 06, 2001

Vulnerability to CRC32 compensation attack detector exploit

In February 2001, Razor Bindview released their "Remote vulnerability in SSH daemon crc32 compensation attack detector" advisory, which outlined a gaping hole in deployed SSH servers that can lead to a remote attacker gaining privileged access. At this writing, over . . .

Anthony Pell
Dec 04, 2001

Telecommuting: Keeping Data Safe and Secure

With the increased availability of broadband access and VPNs, telecommuting is more viable for many workers. But with this new opportunity comes new risks. While telecommuting is an advantage for employees, making sure they adhere to security policies can be a . . .

Anthony Pell
Nov 30, 2001

Common sense key to beating hackers

Today's wireless local area network (Lan) investigation highlights common problems with all IT security. Computing spoke to a panel of experts about the key issues when it comes to protecting your company network and data. Are wireless networks safe? Yes, if . . .

Anthony Pell
Nov 28, 2001

How Instant Messaging Can Jeopardise Network Security

Instant messaging (IM) over the Internet is a fast-growing application that allows people to send short text messages to each other in real time. The main IM systems are provided by Web portal sites such as Yahoo, MSN and AOL. ICQ . . .

Anthony Pell
Nov 28, 2001

Linux Network Security - Page 70

Linux Pentesting Distros: An Essential Tool for Strengthening Network Security

Enhancing Network Security with Linux Proxy Servers

OPNsense 24.7 'Thriving Tiger': Elevating Open-Source Network Security and Performance