Central audit logging: Configuration and collecting of Linux audit events

Central audit logging: Configuration and collecting Linux audit events This guide is to help our users of the Lynis Enterprise Suite to configure a central node to receive Linux audit events. It provides some pointers on how to do a quick set-up, to store and forward events. This information is very valuable for forensic investigations and intrusion detection. Configure the server First start by configuring the server. Since this is a central log host, it should have enough disk capacity […]

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Become a Linux auditor: tips to start with auditing the Linux platform

Become a Linux auditor: tips to start with auditing the Linux platform This guide helps people new to the Linux platform to get a grasp on how the system works. Whenever you are an IT auditor, or simply want to know more about the basics, this guide helps you in determining where to start an audit. Processes Each operating system consists of smaller running processes. In case of Linux this is true as well and can be displayed with the […]

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How to: Using Lynis plugins

How to: Using Lynis plugins Within this “how to” we explain when and how to use Lynis plugins. What are plugins? Plugins are small extensions to an existing program. Also Lynis supports the use of external plugins to extend functionality. Lynis plugins are written in shell script and might use system binaries or external binaries to perform additional checks. The big difference between custom tests and plugins in Lynis, are the goal of the tests. If some logic function checks […]

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Linux Audit Framework: using aureport

Linux Audit Framework: using aureport The Linux audit framework logs events, as specified by the configured watches. To extract particular events we can use the ausearch or aureport tools. The latter is the one we will focus on in this article, to get the most out of the tool. Aureport The aureport utility can be executed without any parameters. It will then extract all audit events available from the log. Since the audit log can be very big, it might […]

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Linux server security: Three steps to secure each system

Linux server security: Three steps to secure each system Determining the level of Linux server security can only by measuring the actual implemented security safeguards. This process is called auditing and focuses on comparing common security measures with the ones implemented. While there is almost no system with all possible safeguards implemented, we still can determine how well (or badly) the system is protected. Security is about finding the weakest link(s) and associate risk with each weakness. Depending on the […]

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Linux audit log: dealing with audit.log file

Linux audit log: dealing with audit.log file The Linux kernel audit framework consists of several components including a daemon, control client, audit rules and Linux audit log. In this article we take additional measures to protect the audit.log file. Aureport The first useful utility to parse the audit.log is aureport. Without parameters it will give a summary of all events. This includes the files, users, audit keys and also items like suspicious events (anomalies). Each sub item can be read […]

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Linux kernel security and how to improve it

Every system is as strong as its weakest link. In the case of an operating system like Linux, one weakness in the kernel could result in a security breach. This article covers the Linux kernel features and how they work. Kernel features Live kernel patching As the kernel is similar to other software, it receives updates to improve it. Now and then a security weakness is discovered in one of the subsystems of the Linux kernel. This means that Linux […]

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Lynis for Auditors: Linux and Unix auditing

Lynis for Auditors: Linux and Unix auditing Auditing on Linux Although Unix and Linux based systems are not new, getting an extensive knowledge of the operating system takes years of practice. Even then, with all changes it might be hard to keep up, especially when being an auditor. Examples of these are the differences between package managers, the way services are started and where binaries or configuration files are located. But no worries, there is help! Why Lynis? The goal […]

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