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Implementing Postfix for Secure SMTP Communication in Firewalls and DMZs

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This article is intended to bring you up to speed quickly on how to use postfix on your network as a secure means of receiving e-mail from and delivering it to Internet hosts. In particular we'll focus on deploying postfix on firewalls, in DMZs and in other settings in which it will be exposed to contact with untrusted systems.. . .

LinuxSecurity.com Team
Sep 15, 2000

SuSE Linux Apache Advisory: Critical Threats and Data Risks

One vulnerability allows a malicious user to read passwords and discern network structure while the other allows a malicious user to create or browse file directories on a Web server. Both vulnerabilities provide a malicious user with access to sensitive data . . .

LinuxSecurity.com Team
Sep 08, 2000

Trinity V3 Denial-of-Service Tool: Threats to Linux Systems

A computer-security company is warning network administrators to watch out for new rogue software capable of playing the role of foot soldier in denial-of-service attacks against Internet servers. X-Force, the research-and-development arm of Atlanta-based Internet Security Systems Inc., reported Tuesday that . . .

LinuxSecurity.com Team
Sep 07, 2000

Postfix MTA Setup: Speed Enhancements and Security Measures

If it's speed and security you're looking for, Postfix is a very nominal choice for a MTA. The MTA uses multiple layers of defense to protect the local system against intruders, as well as having the ability to run in a chroot jail. . . .

LinuxSecurity.com Team
Sep 06, 2000

Effective Strategies For Protecting Remote Backups In Data Recovery

What do you do when your site is attacked or your system fails? Backup, Avi Rubin argues, is the most reliable way to ensure that what you've lost can be recovered. Here he takes a look at protecting your backup and recommends some products that can help. . . .

LinuxSecurity.com Team
Sep 04, 2000

Survey Reveals Computer Problems Are More Stressful Than Traffic Jams

More workers feel stressed out by computers than those driven to distraction by traffic jams, queuing, and the in-laws -- and some find them even more stress-inducing than the end of a relationship, according to a survey. . . .

LinuxSecurity.com Team
Aug 25, 2000

Essential Configuration Steps For Secure Linux Mandrake Installation

As Linux Mandrake works it's way away from it's Red Hat roots, they've added a number of features "out of the box" that make it easier to use as a server. However, there are still a number of things that I . . .

LinuxSecurity.com Team
Aug 21, 2000

CERT Advisory CA-2000-17 Critical: rpc.statd Input Validation Exploit

The CERT/CC has begun receiving reports of an input validation vulnerability in the rpc.statd program being exploited. This program is included, and often installed by default, in several popular Linux distributions. Please see Appendix A of this document for specific information . . .

LinuxSecurity.com Team
Aug 19, 2000

E-Security Firms: Tackling Online Privacy and Cyber Threats

The Internet may feel like a place where you roam anonymously and privately, but with every foray onto the Internet, your PC actively exchanges information with other computers. So just how private and secure are these communications?

LinuxSecurity.com Team
Aug 01, 2000

Why Databases Are Superior to Text Files for Apache Authentication

There are basically three reasons to use a database, rather than a text file, to store data. The first reason is speed. Accessing data stored in a database is much faster than accessing data stored in a text file. A database is designed for rapid location of information. A text file, you have to read through each record until you find what you are looking for.. . .

LinuxSecurity.com Team
Jul 31, 2000

Impact of Public Security Disclosures on Script Kiddies

Well-meaning hackers are creating an army of "script kiddies" by making security holes public, says a speaker at the Black Hat Security Conference.

LinuxSecurity.com Team
Jul 27, 2000

Comprehensive Guide to Configuring OpenBSD 2.7 for Cable NAT Networking

The first thing I did upon getting cable modem access in my apartment was to get an old Pentium 133 computer, put in two NICs, and fire up the OpenBSD 2.7 boot floppy. I did this for several reasons: first, because . . .

LinuxSecurity.com Team
Jul 25, 2000

Protecting Your Website with Standard Apache Authentication Methods

In this article, I'm going to cover the standard way of protecting parts of your Web site that most of you are going to use. In the next part I'll talk about using databases, rather than text files, to contain your . . .

LinuxSecurity.com Team
Jul 24, 2000

Exploring Buffer Overflow Attacks and Their Security Impact

A "buffer overflow" attack deliberately enters more data than a program was written to handle. The extra data, "overflowing" the region of memory set aside to accept it, overwrites another region of memory that was meant to hold some of the . . .

LinuxSecurity.com Team
Jul 20, 2000

Enhancing Apache Server Security for Web Application Protection

An extensive article on Apache security. ... However, does "free" come at a price when it comes to security? It doesn't have to. The diligent network manager will quickly recognize the advantages of choosing a platform that is field-tested on . . .

LinuxSecurity.com Team
Jul 19, 2000

PulsarData.com Launches Smart Card E-Commerce Portal for Government IT

Pulsar Data Systems Inc. on Tuesday unveiled its secure e-commerce portal, PulsarData.com, which uses smart cards to enable agencies to purchase information technology products. Pulsar, a wholly owned subsidiary of Internet data security company Litronic Inc., announced the smart card feature, . . .

LinuxSecurity.com Team
Jul 13, 2000

Network Security Threatened by Buffer Overrun Vulnerabilities Today

The hottest trend these days in network intrusion is to exploit buffer overruns, a technique where-by you feed a program more data than it has allocated, overwriting the memory in the hope of making the program do something it would normally . . .

LinuxSecurity.com Team
Jul 13, 2000

Securing Sendmail On User Accounts, IMAP, And Firewalls

Depending on where you are and what you're doing there, security can mean very different things. This second article in our series on sendmail and security, based on the tutorial given by Eric Allman and Greg Shapiro at the recent USENIX . . .

LinuxSecurity.com Team
Jul 12, 2000

Installing Djbdns as a Secure Alternative to BIND for Unix Name Services

Traditionally, BIND has been the nameserver of choice when doing name service on a Unix system. Like many of its close relatives, such as sendmail, it was designed at a time when the internet wasn't even known as the internet, and . . .

LinuxSecurity.com Team
Jul 11, 2000

Essential Security Tactics for Sendmail Installations Overview

This two-part series on securing sendmail, based on the tutorial given by Eric Allman and Greg Shapiro at the recent USENIX technical conference in San Diego, begins by detailing the measures you can take to secure any sendmail installation. It continues . . .

LinuxSecurity.com Team
Jul 06, 2000

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