operating systems Hardening Linux Server Information Security Stack Exchange

Changing it to read-only reduces the risk of unauthorized modification of critical boot files. In most Linux distributions, pressing ‘CTRL-ALT-DELETE’ will takes your system to reboot process. So, it’s not a good idea to have this option enabled at least on production servers, if someone by mistakenly does this. There is no need to run X Window desktops like KDE or GNOME on your dedicated LAMP server. You can remove or disable them to increase security of server and performance.

This is because only packages from the security repository are updated. So look for external repositories that may be available to the system and consider adding those packages to the configuration. The linux hardening and security lessons configuration file of unattended-upgrades is /etc/apt/apt.conf.d/50unattended-upgrades. For more details regarding the configuration, have a look at our more in-depth article about unattended-upgrades.

Step 3 — Restricting the Shell of a User

For these reasons, knowing the vulnerabilities of a workstation can save users the headache of reinstalling the operating system, or worse, recovering from data theft. Although these mechanisms are an effective way of alerting the community to security vulnerabilities, it is up to system administrators to patch their systems promptly. This is particularly true because crackers have access to these same vulnerability tracking services and will use the information to crack unpatched systems whenever they can. Good system administration requires vigilance, constant bug tracking, and proper system maintenance to ensure a more secure computing environment. A common occurrence among system administrators is to install the operating system without paying attention to what programs are actually being installed.

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Posted: Sat, 25 Nov 2023 23:36:01 GMT [source]

Do not attempt to exploit vulnerabilities on production systems. Doing so can have adverse effects on productivity and efficiency of your systems and network. Performing an assessment shows an overview, which can turn up false positives and false negatives.

Disable USB stick to Detect

Instead of manually checking which packages you no longer need, there are some great tools you can use to find them quickly. In this guide, you will learn to use autoremove and Deborpham. To keep all manually installed software up to date, read its official documentation.

  • Secure Shell or SSH key pairs are difficult to breach with brute force.
  • The framework allows configuring most of the settings related to authentication, such as where to check that a user or account exists.
  • In this step, you completed some general hardening of your OpenSSH server configuration file.
  • By creating different partitions, data can be separated and grouped.

His passion for ethical hacking mixed with his background in programming make him a wise swiss knife professional in the computer science field. Whether you choose an onsite, remote, or cloud-based backup solution, ensure that the backup process is automated and continuous. Point in time system hardening is a beneficial feat, but what really defines deploying a server securely is what is done to maintain that state.

Change the default SSH port number

While you’re at it, enabling UEFI Secure Boot will further ensure only trusted binaries are loaded during boot. Our list starts with some common tips and progresses to advanced and lesser-known suggestions. Collecting https://remotemode.net/ data that passes between two active nodes on a network by eavesdropping on the connection between the two nodes. However, there is no such thing as perfect software and there is always room for further refinement.

Linux Server Hardening in 15 Steps

In the /etc/ssh/sshd_config file, make sure to set PermitEmptyPasswords option to no. In Linux, user’s passwords are stored in ‘/etc/shadow‘ file in encrypted format. To check password expiration of user’s, you need to use ‘chage‘ command. It displays information of password expiration details along with last password change date.