ConfigServer Security & Firewall, also referred to as CSF, is one of the most popular and recommended firewalls for cPanel users. Its main appeal stems from the fact that CSF is easy to install and any beginner cPanel user can tweak it to suit server security requirements.
If you are using cPanel, you need to correctly install firewall to protect your server from malicious attacks. Here are the reasons why CSF is a must-have for any cPanel user.
When you install ConfigServer Security & Firewall, you can block all connections on all protocols in and out of your server. The idea is to let you choose only the connections that you want to allow through the server. By allowing you to control which traffic or connections are allowed, your server is protected from malicious attacks.
Daemons are programs that run in the background of operating systems. They are typically used as multitasking tools. The problem arises, for example, when hackers use sshd daemon. This type of daemon can listen for connections from clients. When a hacker runs sshd daemon on any of the server’s open ports, then the network has been compromised.
ConfigServer Security & Firewall protects by restricting certain IP addresses from unauthorized access to network daemons. And in case a server does suffer an attack, the firewall can still prevent activity that can further compromise the network daemons.
As a cPanel user, your worst nightmare can come true when a DOS tool has been installed by a hacker to attack your and other users’ servers. When CSF is configured correctly, it can filter the ports and prevent outgoing connections — except those made from your specified ports. This can effectively stop DOS attacks and even make such attempts detectable via the system logs.
CSF can be easily configured via the included cPanel or WHM interface. With all its protective features, it has room for flexibility that allows users to tailor their options to match the needs of their servers. Most firewall scripts have bulky and complex designs. That’s just not the case with CSF.
ConfigServer Security & Firewall is a stateful packet inspection (SPI) firewall. This means that it continuously keeps track of all network connections that pass through it. It runs periodically and scans the most recent log files to detect brute force attacks characterized by login attempts that suspiciously fail several times within a short time period. Once detected, CSF’s login failure daemon feature will block off the suspicious IP addresses.
Indeed, the most important reason why CSF is a must-have for cPanel users is the protection it provides against a root compromise. A root compromise can only happen if a daemon is opened up and a hacker gains access to the server. CSF will prevent or at least delay such unauthorized access, giving you enough time to act on the threat. Ultimately, CSF can save you time by sparing you from the tedious work of restoring or rebuilding a compromised server.