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linux-hardening

Apply CIS benchmarks to harden Linux servers with SSH, firewall, and auditing configurations.

Updated Jul 1, 2026
Search Tags:#security#compliance#linux#hardening#cis
One-click install
npx skills add https://github.com/reverb256/hermes-skills --skill linux-hardening-reverb256
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: linux-hardening
Source: https://github.com/reverb256/hermes-skills/tree/main/linux-hardening
Command: npx skills add https://github.com/reverb256/hermes-skills --skill linux-hardening-reverb256

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires sysctl, ufw, iptables, nftables, auditd, fail2ban, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill provides a comprehensive approach to hardening Linux servers, ensuring they are secure and meet compliance requirements.

Core Features & Use Cases

  • Security Configuration: Apply CIS benchmarks to secure Linux servers, configure SSH, manage users, and enable security features.
  • SSH Hardening: Implement robust SSH configurations for secure remote access.
  • User Security: Enforce password policies, account lockout policies, and create non-root sudo users.
  • Firewall Configuration: Set up firewall rules to control network traffic and prevent unauthorized access.
  • Kernel Hardening: Configure kernel parameters for enhanced security.
  • File Permissions: Secure critical files and directories.
  • Service Hardening: Disable unused services and configure security settings for running services.
  • Audit Configuration: Set up auditing to monitor system activity and detect security incidents.
  • Intrusion Detection: Use Fail2ban to protect against brute-force attacks.
  • Additional Security Measures: Implement SELinux/AppArmor, automatic updates, and HIDS.
  • Security Checklists: Provide checklists for initial setup and regular maintenance.
  • Use Case: A system administrator tasked with securing a new Linux server for a financial institution can use this Skill to harden the server according to industry standards and compliance requirements.

Quick Start

Run the 'audit-system.sh' script to perform a security audit on your Linux server.

Frequently Asked Questions about linux-hardening

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I apply CIS benchmarks to harden a Linux server?▼

To apply CIS benchmarks for Linux hardening, you configure SSH, enforce password policies, set up firewall rules, and secure kernel parameters. This ensures your server meets compliance requirements by systematically applying security best practices across system components.

What is the best way to secure SSH and prevent brute-force attacks on Linux?▼

Securing SSH and preventing brute-force attacks involves implementing robust SSH configurations and deploying Fail2ban for intrusion detection. These measures harden remote access and automatically block suspicious login attempts on your Linux server.

Do I need auditd and fail2ban installed to set up Linux server security auditing?▼

Yes, setting up Linux server security auditing requires auditd and fail2ban alongside sysctl and firewall tools like ufw or nftables. These dependencies enable system activity monitoring, intrusion detection, and kernel hardening for comprehensive compliance.

How does kernel hardening with sysctl enhance Linux security?▼

Kernel hardening with sysctl enhances Linux security by configuring internal kernel parameters to restrict unsafe network behaviors and memory access. This system-level tuning prevents common exploitation vectors and strengthens overall server resilience against threats.

Can I use ufw or nftables for firewall configuration during Linux hardening?▼

Yes, you can use ufw, iptables, or nftables for firewall configuration during Linux hardening. Setting up these firewall rules controls network traffic and prevents unauthorized access, ensuring only permitted connections reach the server.

What limitations should I consider when disabling unused services for Linux compliance?▼

When disabling unused services for Linux compliance, ensure you do not break critical dependent applications. Limitations include accidentally severing required network dependencies, so carefully audit running services before hardening to maintain system stability.

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