You’ll also learn how the local firewall works in Linux and how to configure it. We’ll cover how permissions work in detail, including special modes, file attributes, and ACL’s. You’ll also learn what rootkits are, how to detect them, and https://remotemode.net/become-a-linux-network-engineer/linux-hardening-and-security/ how to remove them. In the networking section, you’ll learn how to secure network services that run on Linux systems. We’ll cover file system security and how permissions work in detail, including special modes, file attributes, and ACLs.
Therefore it is up to the administrator of the system to enhance the security level based on the risks and type of usage. The more changes, the bigger the risk that something will no longer work. The following is a list of security and hardening guides for several of the most popular Linux distributions. JShielder is a security tool for Linux systems to make them more secure by adding system hardening measures. To help with securing a Linux system there is a variety of tools available. Useful for system hardening are auditing tools as they perform a health scan of the system and define room for improvement.
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Implementing the listed security measures only makes your system more secure if done correctly. There are no ’10 things’ that are the best, as it depends strongly on each system and its purpose. When you come across other checklists with a number in the title, then most likely it’s not a real checklist. Like hardening and securing an operating system, a good checklist requires dedication and a lot of work. This is sometimes referred to as hardening, or in this context, kernel configuration hardening. Bastille Linux was a popular tool to perform hardening of systems running Linux and other flavors.
The framework allows configuring most of the settings related to authentication, such as where to check that a user or account exists. It also includes the configuration related to password strength, two-factor authentication, and even protection mechanisms against brute-force attacks. Most software packages are a collection of one or more tools bundled together. Sooner or later one of these packages might contain a vulnerability.
Bastille Linux (hardening tool)
System hardening is the process of securing a system by reducing possible weaknesses. This is done by restricting access and capabilities of the kernel, software components, and its configuration. The so-called attack surface gets smaller, making the system more secure. System hardening resources such as hardening guides are typically consisting of best practices within a field of expertise. Checklists may give a false sense of security to technical people and managers.
From there, we look at authentication systems and the various account types on a Linux system, and how to secure each one. Keep yourself and your company out of the news by protecting your Linux systems from hackers, crackers, and attackers! Zeus is a tool to perform a quick security scan of an AWS environment. It helps to find missing security controls, so additional system hardening measures can be applied to systems. This checklist has been created based on our knowledge and additional research.
You’ll learn the security weaknesses of the Linux operating system and be given step-by-step instructions on how to protect those weaknesses. System hardening is also needed for systems using the Linux kernel. The primary reason is that Linux distributions have to make a sacrifice between usability, performance, and security.
- As part of the network configuration, a firewall is a useful defense mechanism.
- The Linux kernel uses file permissions as a first layer to see if a user is granted access to a particular file or directory.
- In the networking section, you’ll learn how to secure network services that run on Linux systems.
- The internet contains a lot of resources of value, especially when it comes to technical subjects.
- Zeus is a tool to perform a quick security scan of an AWS environment.
- In addition to Linux, Jason has experience supporting proprietary Unix operating systems including AIX, HP-UX, and Solaris.
The installation process is a good first indicator on well a system is hardened. During this phase, the operating system is installed on a local disk. A proper partitioning structure helps with splitting executable code from data.
After the installation of a Linux-based system, so-called system hardening is needed. This involves a range of steps to tighten the capabilities of a system, its software, and its users. By applying best practices, we can reduce the chance of a system being misused or exploited. This learning path is intended for anyone who wants to understand how to secure their Linux systems or enhance existing their existing security.
- This learning path is intended for anyone who wants to understand how to secure their Linux systems or enhance existing their existing security.
- The software for the system is typically selected during the installation phase.
- This course introduces the Linux Security and Hardening learning path and what you can expect from it.
- Jason has professional experience with CentOS, RedHat Enterprise Linux, SUSE Linux Enterprise Server, and Ubuntu.
- The so-called attack surface gets smaller, making the system more secure.
- You’ll learn about the various account types on a Linux system and how to secure each one.
This is simply a known weakness in the software, which can lead to instability or even a security breach. For that reason, the system should be ‘patched’ on a regular basis. This means, testing and installing any updates that are announced as security updates. Like the authoritative resources above, there are specialized companies in the field. To prevent giving any company special treatment, we will not mention any unless it warrants a mention. Examples may include kernel development, work on security software, or other great contributions to the field.
A mail server usually has this port blocked and instead allow connections to port 25/TCP. The internet contains a lot of resources of value, especially when it comes to technical subjects. At the same time, many blog posts and articles are not of high quality. Some of the authors even don’t have a full understanding of the tips they advocate. For that reason, we suggest working with authoritative sources of high quality. In the area of system operations or information security, the usage of any checklist requires a serious warning.