{"id":1689,"date":"2025-03-06T16:26:35","date_gmt":"2025-03-06T13:26:35","guid":{"rendered":"https:\/\/wafatech.sa\/blog\/linux\/linux-security\/best-practices-for-securing-your-linux-server-against-ssh-brute-force-attacks\/"},"modified":"2025-03-06T16:26:35","modified_gmt":"2025-03-06T13:26:35","slug":"best-practices-for-securing-your-linux-server-against-ssh-brute-force-attacks","status":"publish","type":"post","link":"https:\/\/wafatech.sa\/blog\/linux\/linux-security\/best-practices-for-securing-your-linux-server-against-ssh-brute-force-attacks\/","title":{"rendered":"Best Practices for Securing Your Linux Server Against SSH Brute-Force Attacks"},"content":{"rendered":"<p><br \/>\n<\/p>\n<p>As the backbone of many enterprise and web infrastructures, Linux servers need robust security measures to defend against a growing array of threats. One of the more common vulnerabilities faced by Linux servers is brute-force attacks on the Secure Shell (SSH) protocol. These attacks involve automated scripts that repeatedly attempt to guess SSH credentials (username and password combinations) until they successfully gain access. This article will outline best practices for securing your Linux server against SSH brute-force attacks.<\/p>\n<p><\/p>\n<h2>Understanding SSH Brute-Force Attacks<\/h2>\n<p><\/p>\n<p>Before diving into the preventive measures, it&#8217;s essential to understand what a brute-force attack entails. Attackers leverage powerful tools and bots to cycle through a list of potential username\/password combinations, hoping to find the correct credentials. This can occur in a matter of minutes or hours, depending on the complexity of the password and the attacker&#8217;s resources.<\/p>\n<p><\/p>\n<h3>1. Change the Default SSH Port<\/h3>\n<p><\/p>\n<p>By default, SSH runs on port 22. Changing this port to a non-standard one can help reduce the noise from automated scans and attacks, as many bots automatically target port 22. Here\u2019s how to change the SSH port:<\/p>\n<p><\/p>\n<ol><\/p>\n<li>\n<p>Open the SSH configuration file:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo nano \/etc\/ssh\/sshd_config<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Look for the line:<\/p>\n<p><\/p>\n<pre><code>#Port 22<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Uncomment the line and change it to your new port number (e.g., 2222):<\/p>\n<p><\/p>\n<pre><code>Port 2222<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Save and exit the file, then restart the SSH service:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo systemctl restart sshd<\/code><\/pre>\n<p>\n<\/li>\n<p>\n<\/ol>\n<p><\/p>\n<h3>2. Use SSH Key Authentication<\/h3>\n<p><\/p>\n<p>SSH key authentication is more secure than password authentication. With keys, the attacker needs access to your private key, making brute-force attempts futile. To set up SSH key authentication:<\/p>\n<p><\/p>\n<ol><\/p>\n<li>\n<p>Generate a key pair on your client machine:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">ssh-keygen -t rsa -b 4096<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Transfer the public key to your server:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">ssh-copy-id -i ~\/.ssh\/my_key.pub user@your_server_ip<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Disable password authentication by editing the SSH configuration file:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo nano \/etc\/ssh\/sshd_config<\/code><\/pre>\n<p><\/p>\n<p>Change the following line:<\/p>\n<p><\/p>\n<pre><code>PasswordAuthentication no<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>Save and restart the SSH service.<\/li>\n<p>\n<\/ol>\n<p><\/p>\n<h3>3. Implement Fail2Ban<\/h3>\n<p><\/p>\n<p>Fail2Ban is a powerful tool that helps protect against brute-force attacks by monitoring SSH logs and banning IP addresses that exhibit suspicious behavior.<\/p>\n<p><\/p>\n<ol><\/p>\n<li>\n<p>Install Fail2Ban:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo apt-get install fail2ban<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Configure Fail2Ban:<\/p>\n<p><\/p>\n<p>Create a new configuration file or edit the existing one:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo nano \/etc\/fail2ban\/jail.local<\/code><\/pre>\n<p><\/p>\n<p>Add the following configuration:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">[sshd]<br \/>\nenabled = true<br \/>\nport = ssh<br \/>\nfilter = sshd<br \/>\nlogpath = \/var\/log\/auth.log<br \/>\nmaxretry = 5<br \/>\nbantime = 86400<\/code><\/pre>\n<p><\/p>\n<p>This setting will ban an IP for 24 hours after five failed login attempts.<\/p>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Restart Fail2Ban:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo systemctl restart fail2ban<\/code><\/pre>\n<p>\n<\/li>\n<p>\n<\/ol>\n<p><\/p>\n<h3>4. Configure SSH to Limit User Access<\/h3>\n<p><\/p>\n<p>Limiting access to specific users can reduce the number of vectors an attacker has for brute-force attempts.<\/p>\n<p><\/p>\n<ol><\/p>\n<li>\n<p>Open the SSH configuration file:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo nano \/etc\/ssh\/sshd_config<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Add or modify the following line with your permitted users:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">AllowUsers user1 user2<\/code><\/pre>\n<p>\n<\/li>\n<p>\n<\/ol>\n<p><\/p>\n<p>This will permit only <code>user1<\/code> and <code>user2<\/code> to access the server using SSH, denying all others.<\/p>\n<p><\/p>\n<h3>5. Use Two-Factor Authentication (2FA)<\/h3>\n<p><\/p>\n<p>Implementing two-factor authentication for SSH adds another layer of security. Tools like Google Authenticator or Duo can be used for this purpose.<\/p>\n<p><\/p>\n<ol><\/p>\n<li>\n<p>Install the necessary packages:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo apt-get install libpam-google-authenticator<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Configure Google Authenticator for a user:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">google-authenticator<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Edit the SSH configuration to use PAM:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo nano \/etc\/ssh\/sshd_config<\/code><\/pre>\n<p><\/p>\n<p>Ensure the following line is present:<\/p>\n<p><\/p>\n<pre><code>ChallengeResponseAuthentication yes<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Add the following line to <code>\/etc\/pam.d\/sshd<\/code>:<\/p>\n<p><\/p>\n<pre><code>auth required pam_google_authenticator.so<\/code><\/pre>\n<p>\n<\/li>\n<p><\/p>\n<li>\n<p>Restart SSH:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo systemctl restart sshd<\/code><\/pre>\n<p>\n<\/li>\n<p>\n<\/ol>\n<p><\/p>\n<h3>6. Keep Your System Updated<\/h3>\n<p><\/p>\n<p>Regularly updating your Linux server ensures that you have all the latest security patches and updates. Use the following commands to keep your system up to date:<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo apt-get update<br \/>\nsudo apt-get upgrade<\/code><\/pre>\n<p><\/p>\n<h3>7. Monitor Your Logs<\/h3>\n<p><\/p>\n<p>Regularly monitor system and authentication logs for any suspicious activity. Consider using tools like <code>logwatch<\/code> for detailed summaries of server activity.<\/p>\n<p><\/p>\n<pre><code class=\"language-bash\">sudo apt-get install logwatch<\/code><\/pre>\n<p><\/p>\n<h3>Conclusion<\/h3>\n<p><\/p>\n<p>Securing your Linux server against SSH brute-force attacks is crucial to maintaining a robust security posture. By implementing the best practices outlined in this article\u2014changing the default SSH port, using SSH key authentication, deploying Fail2Ban, limiting user access, introducing two-factor authentication, keeping your system current, and monitoring logs\u2014you can significantly reduce the likelihood of successful unauthorized access attempts.<\/p>\n<p><\/p>\n<p>Remember, security is not a one-time task but an ongoing process that requires vigilance and continuous improvement. Stay proactive, stay secure!<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>As the backbone of many enterprise and web infrastructures, Linux servers need robust security measures to defend against a growing array of threats. One of the more common vulnerabilities faced by Linux servers is brute-force attacks on the Secure Shell (SSH) protocol. These attacks involve automated scripts that repeatedly attempt to guess SSH credentials (username [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1690,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[22],"tags":[340,432,265,237,264,266,770],"class_list":["post-1689","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-security","tag-attacks","tag-bruteforce","tag-linux","tag-practices","tag-securing","tag-server","tag-ssh","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.5 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Best Practices for Securing Your Linux Server Against SSH Brute-Force Attacks - 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