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Ubuntu system hardening guide for desktops and servers

The list can go on and on, but these should be enough to start with. For example, some companies add banners to deter attackers and discourage them from continuing further. I encourage you to check the manual of the SSH to understand all the configurations in this file, or you linux hardening and security lessons can visit this site for more information. Another reason to use iptables or other firewall solutions is to block bad traffic. Sure, it is better if you can do this on a network level, but sometimes only the receiving system can make the decision what traffic is good or bad.

Linux Server Hardening in 15 Steps

If you care about security then hardening is very important! This will make sure your server is secure from threats like hackers. Your customer’s data will be secure, there will be no downtime, services will run 24/7 and you will maintain client trust. There are a few risks with user accounts on systems, especially on servers. The first risk is that local users may use local exploits to elevate their permissions and become root. Fortunately, this can only happen if there is actually a known weakness and when the user is skilled enough to run the related malicious script or code.

Tip 5: Automate the hardening of Linux by enabling SELinux

Testing verifies that backups contain the right (and most current) files and can be recovered easily in the event of data loss. If you’ve recently completed a manual backup, use the “lastbackup” command to find details. Likewise, the “scan” command will help you verify that files are properly backed up. While determining where to save keys, weigh the likelihood of physical attacks against hacked servers.

The threat of allowing an intruder to plug-in a USB stick and boot into the system fairly quickly is a vulnerability that is resolved by making this change. This website is using a security service to protect itself from online attacks. The action you just performed triggered the security solution. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Open ports may reveal network architecture information while extending attack surfaces.

Backup and test a restore

A mail server usually has this port blocked and instead allow connections to port 25/TCP. During this part of the installation, there is also the option to encrypt all the data. It is done by setting a password or passphrase, that needs to be provided during the boot of the Linux system.

  • TecMint is always interested in receiving comments, suggestions as well as discussion for improvement.
  • Security-Enhanced Linux, or SELinux for short, is a built-in access control mechanism.
  • It looks like the principle of least privilege, yet focuses on preventing something in the first place.

With the difficult choices that Linux distributions have to make, you can be sure of compromises. These compromises typically result in a lowered level of security. The Linux platform also has its fair share of backdoors, rootkits, works, and even ransomware. That is one of the reasons why it is important to do system hardening, security auditing, and checking for compliance with technical guidelines. In most Linux distributions, pressing ‘CTRL-ALT-DELETE’ will takes your system to reboot process.

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