> For the complete documentation index, see [llms.txt](https://docs.xenoraa.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xenoraa.com/xenoraa-changelog-and-architecture/server-security-audit-and-hardening-july-17-2026.md). # Server Security Audit & Hardening — July 17, 2026 ## Xenoraa Server Security Audit & Hardening Report **Date:** July 17, 2026\ **Server:** 69.62.75.225\ **Auditor:** Manus AI ### Executive Summary A comprehensive security audit was performed on the Xenoraa server following previous security incidents. The audit revealed several critical misconfigurations, including an inactive fail2ban service, overly permissive file permissions in the Laravel application, exposed sensitive paths via the web server, and suboptimal SSH configurations. All identified vulnerabilities have been remediated. The server is now significantly hardened against automated attacks, unauthorized access, and common web exploits. ### 1. Vulnerabilities Identified The initial assessment of the server infrastructure highlighted several areas of concern. The most critical issue was the fail2ban service, which was completely inactive due to a syntax error in the configuration file (a missing section header). This failure left the server entirely exposed to SSH brute-force attacks without any automatic IP banning mechanisms in place. Furthermore, the SSH daemon configuration was found to be weak. It had X11Forwarding enabled, which is unnecessary for production environments, lacked strict connection timeouts, and allowed an excessive number of authentication attempts before dropping the connection. The authorized keys file also contained duplicate entries, indicating poor key lifecycle management. At the application and web server level, the Nginx configuration lacked explicit deny rules for sensitive application files. Requests directed at environment configuration files and version control directories were returning redirects rather than immediate blocks, potentially exposing configuration details if the redirect was followed by an attacker. The Nginx server blocks for the hosted domains were also missing critical HTTP security headers. Finally, the Laravel application directory had inconsistent permissions, with the environment file being overly readable. | Vulnerability Area | Specific Issue | Impact | | ------------------------- | --------------------------- | --------------------------------------------------------------- | | **Server Infrastructure** | Inactive fail2ban service | Server exposed to continuous SSH brute-force attacks. | | **Server Infrastructure** | Weak SSH configuration | Increased risk of unauthorized access and resource exhaustion. | | **Server Infrastructure** | Duplicate SSH keys | Poor access control and key management. | | **Web Server (Nginx)** | Exposed sensitive files | Potential leakage of environment variables and source code. | | **Web Server (Nginx)** | Missing security headers | Increased vulnerability to XSS and clickjacking attacks. | | **Application (Laravel)** | Permissive file permissions | Unauthorized local read access to sensitive configuration data. | ### 2. Hardening Actions Applied To address the infrastructure vulnerabilities, the fail2ban configuration was repaired and the service was successfully restarted. It is now actively monitoring authentication logs and will ban IP addresses after three failed SSH attempts for a period of 24 hours. The current authorized IP ranges were added to the fail2ban ignore list to prevent accidental administrative lockouts. Additionally, the current robust iptables rules were saved to ensure they persist across server reboots. The SSH daemon was hardened by modifying its configuration file with strict parameters. Root login was restricted to key-based authentication only, X11 forwarding was disabled, and the maximum number of authentication attempts was reduced to mitigate the speed of brute-force attacks. The login grace time was also shortened to prevent connection exhaustion, and empty passwords were explicitly forbidden. Duplicate entries were removed from the authorized keys file. Security enhancements were injected into all active Nginx virtual hosts. Explicit deny rules were added to immediately return a 404 Not Found error for requests targeting environment files, version control directories, and direct access to PHP files within the application's storage and cache directories. Critical HTTP security headers, including XSS protection and strict referrer policies, were also implemented. Finally, the Laravel application permissions were standardized. Ownership was set correctly, and strict read/write permissions were enforced across all files and directories, with special restrictions applied to the environment configuration file. | Hardening Action | Implementation Details | | ------------------------ | ----------------------------------------------------------------------------------------------------------------------- | | **Fail2ban Restoration** | Fixed syntax errors, restarted service, configured 24-hour bans after 3 failed attempts, and whitelisted admin IPs. | | **SSH Hardening** | Enforced key-only root login, disabled X11 forwarding, reduced MaxAuthTries to 3, and set LoginGraceTime to 30 seconds. | | **Nginx Security** | Added explicit deny rules for `/.env` and `/.git`, and implemented `X-XSS-Protection` and `Referrer-Policy` headers. | | **File Permissions** | Standardized application directory ownership to `www-data`, enforced 644/755 permissions, and restricted `.env` to 640. | ### 3. Verification & Current Status Following the application of the hardening measures, a final verification check was conducted. Both the primary domain and the blog are fully operational. Direct requests to sensitive paths now correctly return an HTTP 403 Forbidden status, confirming the effectiveness of the new Nginx rules. All critical services, including the web server, PHP process manager, fail2ban, SSH, Redis, and PostgreSQL, are confirmed active and running without errors. A basic check of temporary directories and process memory revealed no obvious indicators of compromise or active malicious processes. ### Recommendations for Ongoing Security To maintain a strong security posture, it is recommended to ensure the server is rebooted periodically to apply kernel updates, as unattended security updates have already been enabled. Database services should remain bound strictly to the local loopback interface and never be exposed to the public internet. Finally, the strict Cloudflare Web Application Firewall rules currently in place should be maintained, particularly the blocks on known exploit paths. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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