Linux is widely known as a highly secure operating system (OS) because its open-source nature allows for continuous scanning for and updating against vulnerabilities. But this doesn’t mean you are off the hook if you’re a Linux user. Cybercriminals may still attempt attacks on your system no matter how secure your platform is. This article will cover some cybersecurity best practices for Linux systems, and provide tips on how your Michigan business can stay safe without expending too many resources.
Update your systems regularly
The Linux community is constantly working out bugs and patching vulnerabilities in the system, but to benefit from this, you have to apply these updates as soon as they become available.
This must be done regularly and relatively often, as the longer a vulnerability is present in your Linux system, the higher the chances of a breach. You want the fixes implemented as soon as they are released.
| Tip: Enable automatic updates for your OS and integrated software, or make a schedule for your IT team to check for and install updates regularly. |
Limit user access and privileges
Not all users in your business need full access to your systems and data. If someone has access that they don’t require, that’s just one more unnecessary risk. This concept, called the principle of least privilege, reduces the risk of internal threats or accidental security breaches.
Linux makes user management like this easy, but it isn’t automatic.
| Tip: Call a meeting with your IT team, managers, and other important stakeholders to review user roles in your organization. Restrict administrative privileges to only the employees who need them to perform their functions. |
Disable root login
Root is a Linux superuser account that has elevated administrative privileges. Should it fall into the wrong hands, a cybercriminal would have virtually limitless access to your Linux systems. Disable it to ensure that it cannot be accessed by anyone, be it a rogue member of your team or an external threat.
| Tip: The root account depends on the Linux distribution you are using, so check the documentation or ask the vendor how to access and disable the root login. |
Implement multifactor authentication (MFA)
While you’re working on access controls, you should also implement MFA to mitigate the risk of stolen login credentials. MFA adds an extra layer of security by requiring users to provide at least two forms of verification to access certain systems or data.
These forms most often consist of a strong password and one or more of the following:
- One-time code sent via email
- Verification code via authenticator app
- Biometrics (face scan, fingerprints, etc.)
- RF fob
- Physical keycard
| Tip: Wherever possible, enable MFA for accessing your Linux system, especially for administrative accounts that have higher privileges. Even if a cybercriminal guesses a user password or acquires it through phishing, they won’t be able to get access to your systems. |
Utilize Linux’s firewall capabilities
Firewalls act as a gate between your system and the internet, blocking unauthorized access while allowing legitimate traffic to pass through. Linux offers built-in firewall tools that are relatively easy to configure, even for non-technical users. They should be more than sufficient for most businesses, providing a strong layer of security while allowing for customization as needs evolve.
| Tip: When activating and configuring a firewall with Linux, be careful not to go overboard with the restrictions or you could slow down your operations. Consider enlisting a professional versed in Linux to customize your configurations. |
Secure remote access functions
Cybercriminals often target systems with weak remote access security because it can give them a way into your entire system. If you or your teams access the Linux system remotely, it’s essential to secure the remote access protocol called SSH (Secure Shell).
| Tip: You can use a password to secure your SSH login, but it’s better to opt for more secure login methods like SSH keys. |
Do you need Linux cybersecurity expertise?
Linux is a remarkably secure platform, but minimizing your risk will take expertise that’s hard to come by due to the operating system’s position outside the mainstream. At Liberty Center One, we specialize in IT delivery solutions, and our team is well versed in Linux server architectures and how to secure them. Together, we will determine and then implement the optimal cybersecurity tools and configurations for your business’s needs.
To learn more about how our expert team can help you implement effective cybersecurity measures, contact us today for a consultation.