Host Security Guide: A Practical Tutorial from Getting Started to Mastery

with the popularity of digital services, the host as the core carrier of data storage and business operation, the risk of network attacks continues to rise, from port scanning to malicious code injection, any protection omission may lead to data leakage, business interruption and other serious consequences. To this end, we have sorted out the whole process of host security protection from basic cognition to actual combat reinforcement. Whether you are a novice in host management or an experienced operation and maintenance personnel, you can find practical methods to adapt and build a solid host security line.

, the host security protection entry cognitive points?

want to do a good job of host security protection, first of all, to clarify its core goals and basic concepts, to avoid detours in subsequent configurations.

1, the core goal of host security protection

host security protection is to ensure the confidentiality, integrity and availability of the host system, prevent unauthorized users from accessing sensitive data, avoid system files being tampered with, and ensure that the business can continue to operate stably. The focus of host protection in different scenarios is slightly different. For example, e-commerce hosts need to focus on protecting payment data security, and corporate office hosts should take into account the anti-leakage needs of internal data.

2 Common host security threat types

current mainstream host security threats include weak password attacks, malicious software intrusion, port scanning and exploitation, system vulnerability exploitation, etc. Among them, weak password attacks account for the highest proportion, and about 30% of host intrusion incidents originate from administrators setting too simple login passwords; malicious software often enters the host through phishing emails, malicious download links, etc., quietly stealing data or destroying the system.

Two, the host security protection basic configuration steps?

complete the basic cognition, you can start the entry configuration of the host security protection, which is the first step to build a security defense line.

1, account and password security configuration

first of all to close unnecessary default account, delete long-term idle useless account, to avoid attackers using these accounts to try to log in; secondly to set up a password of sufficient complexity, including upper and lower case letters, numbers and special characters, the length is not less than 12, while opening the regular password replacement mechanism, updated every 90 days; conditional circumstances can enable two-factor authentication, in addition to the password also need to complete the authentication through the mobile phone verification code or U shield, greatly enhance login security.

2, system port and service optimization

host may become an attack entry, so close unnecessary ports, such as non-mail servers can close mail server level ports such as 25, 110; at the same time disable unused system services, such as desktop hosts can close remote desktop services, FTP services, etc., to reduce the attack surface. After the configuration is completed, you can check yourself through the port scanning tool to confirm that only the ports and services necessary for the business are retained.

three, the host security protection advanced strengthening strategy?

the basic configuration is completed, it is necessary to strengthen the host security protection capabilities through advanced means to deal with more complex network attack scenarios.

1, system vulnerability patch timely update

system vendors will regularly release vulnerability patches to repair discovered security risks, administrators need to turn on the automatic update function, or regularly manually check the patch update situation, and install high-risk vulnerability patches in time. It should be noted that before installing patches, you must first verify in the testing environment to avoid patches and existing business systems conflict, resulting in business interruption, especially for the production environment host security protection, patch updates need to be cautious.

2 Deploy host security tools

can deploy professional host security protection tools, such as intrusion detection system IDS, intrusion prevention system IPS, real-time monitoring of network traffic and system operation of the host, timely detection and blocking abnormal behavior; at the same time install antivirus software and malicious code protection tools, regularly scan the host to remove potential malicious software. In addition, the host firewall can be configured to set fine access control rules according to business needs, allowing only legitimate Internet Protocol Addresses and ports to access the host.

four, host security protection emergency response method?

even if a full range of host security protection, may also encounter unexpected attacks, so the need to master emergency response methods to minimize losses.

1, rapid identification of abnormal events

daily to pay attention to the host's system logs, network traffic data, when a large number of failed login attempts, abnormal file modification records, unknown processes occupy a lot of resources, etc., need to be vigilant immediately, may be the host has been attacked. Some host security tools will automatically issue an alarm, the administrator should check the alarm information in time to confirm the severity of the incident.

2, the handling process of the attack incident

confirm that the host is attacked, first of all to isolate the infected host, disconnect its connection with the network, to avoid the spread of attacks to other hosts; secondly to backup important data to prevent data from being maliciously deleted or tampered with; and then through log analysis to determine the attack path and intrusion point, targeted repair vulnerabilities, such as if the attack originates from a weak password, you need to immediately modify all account passwords and open two-factor authentication; finally restore the host system and business, while continuing to monitor the status of the host, confirm that the attack has been completely cleared.

To sum up, the host security is a continuous iterative process, from the entry-level cognition, basic configuration, advanced strengthening to the whole process of emergency response. Beginners first do account passwords, port services and other basic configuration, advanced users to patch updates, protection tools deployment to strengthen the line of defense, while mastering emergency response methods, in order to continue to ensure the security and stability of the host system in a complex network environment.