How to set up a CentOS system to prevent automated execution of malicious code

How to set up the CentOS system to prevent the automatic execution of malicious code

The automatic execution of malicious code is an important preventive work in computer system security. As a commonly used Linux distribution, the CentOS system has many built-in security features, but we can also improve the security of the system through some additional settings to prevent the automatic execution of malicious code. This article will introduce some setup methods and provide code examples for reference.

1. Install and update the system

First, make sure your CentOS system is the latest version. Update your system by running the following command:

sudo yum update

This will get the latest security patches and updates. Regularly updating your system is an important part of keeping your system secure.

2. Configuring iptables firewall

iptables is a standard firewall tool in Linux systems that can filter and manage network packets. We can use iptables to configure firewall rules to limit the automatic execution of malicious code.

To prevent external computers from accessing services on a CentOS system, you can use the following command to close all inbound connections and deny new connections:

sudo iptables -P INPUT DROP
sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT

This will allow already established connections to continue, but for New connection requests will be rejected.

3. Disable unnecessary services

Disabling unnecessary services can reduce the risk of system exposure to potential attacks. You can list currently running services by running the following command:

sudo systemctl list-unit-files --type=service

Then, use the following command to disable unnecessary services:

sudo systemctl disable <服务名>

where is the listed service name. For example, the command to disable the Telnet service is:

sudo systemctl disable telnet

4. Installing and Configuring SELinux

SELinux (Security-Enhanced Linux) is a Mandatory Access Control (MAC) mechanism that Used to limit the permissions of a process. By enabling SELinux, we can enhance the security of the system.

First, check if SELinux is installed and running:

sudo sestatus

If SELinux is not installed, use the following command to install it:

sudo yum install selinux-policy-targeted

Then, open the SELinux configuration file and copy it Set to enforcing mode:

sudo nano /etc/selinux/config

Uncomment the following line:

SELINUX=enforcing

Save the file and restart the system.

5. Use ClamAV for malicious code scanning

ClamAV is a free and open source anti-virus software. By installing ClamAV and performing regular scans, we can detect malicious code in a timely manner.

First, install ClamAV:

sudo yum install clamav

After the installation is complete, update the virus database:

sudo freshclam

Then, run the following command to scan the system:

sudo clamscan -r /

-r Parameter means recursively scan the entire file system.

Conclusion

Through the above settings, we can prevent the automatic execution of malicious code in the CentOS system. Remember, security is an ongoing process and we should regularly update systems, harden firewall configurations, disable unnecessary services, use mandatory access control mechanisms, and conduct regular malicious code scans. Through these operations, we can improve the security of the system and reduce the risk of malicious code attacks.

Hope this article is helpful to you!

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