Linux is a very secure system, however is as secure as its administrator is aware of security.

These are the most important tasks to keep a Linux distribution secure:

• Only install software from the distribution repositories (apt-get, yum...). Avoid downloading pre-packaged (.deb, .rpm) software unless it comes from very known sources.

• Learn to use IP Tables and create a configuration that let pass through your system only the traffic that you want to have.

• Keep the system updated. The distribution repositories are updated as soon as possible when a vulnerability is discovered.

• Understand user permissions and be as restrictive as possible.

• Disable SSH passwords and enable login using SSH keys.

• Enforce the use of strong passwords.

• Lock the root account, so nobody can log as root and whoever needs root permissions will use sudo.

• Install and learn to use SELinux. It will increase the basic Linux security.

Linux is a very secure system, however it isn't full free of vulnerabilities. There are malware known as rootkits that can get to a Unix/Linux system and steal information, destoy data,etc.

However for rootkits being successful the system must be insecure / bad managed, just because a Linux system is as secure as its administrator is aware of security.

These are the most important tasks to keep a Linux distribution secure:

• Only install software from the distribution repositories (apt-get, yum...). Avoid downloading pre-packaged (.deb, .rpm) software unless it comes from very known sources.

• Learn to use IP Tables and create a configuration that let pass through your system only the traffic that you want to have.

• Keep the system updated. The distribution repositories are updated as soon as possible when a vulnerability is discovered.

• Understand user permissions and be as restrictive as possible.

• Disable SSH passwords and enable login using SSH keys.

• Enforce the use of strong passwords.

• Lock the root account, so nobody can log as root and whoever needs root permissions will use sudo.

• Install and learn to use SELinux. It will increase the basic Linux security.

Linux is a very secure system, however is as secure as its administrator is aware of security.

These are the most important tasks to keep a Linux distribution secure:

• Only install software from the distribution repositories (apt-get, yum...). Avoid downloading pre-packaged (.deb, .rpm) software unless it comes from very known sources.

• Learn to use IP Tables and create a configuration that let pass through your system only the traffic that you want to have.

• Keep the system updated. The distribution repositories are updated as soon as possible when a vulnerability is discovered.

• Understand user permissions and be as restrictive as possible.

• Disable SSH passwords and enable login using SSH keys.

• Enforce the use of strong passwords.

• Disable the root account, so whoever needs root permissions will use sudo.

• Install and learn to use SELinux. It will increase the basic Linux security.

Linux is a very secure system, however is as secure as its administrator is aware of security.

These are the most important tasks to keep a Linux distribution secure:

• Only install software from the distribution repositories (apt-get, yum...). Avoid downloading pre-packaged (.deb, .rpm) software unless it comes from very known sources.

• Learn to use IP Tables and create a configuration that let pass through your system only the traffic that you want to have.

• Keep the system updated. The distribution repositories are updated as soon as possible when a vulnerability is discovered.

• Understand user permissions and be as restrictive as possible.

• Disable SSH passwords and enable login using SSH keys.

• Enforce the use of strong passwords.

• Lock the root account, so nobody can log as root and whoever needs root permissions will use sudo.

• Install and learn to use SELinux. It will increase the basic Linux security.