Safely Upgrading OpenSSH on a Remote Linux PC

Abstract: This article provides instructions on how to safely upgrade OpenSSH on a remote Linux PC. It covers temporary filtering of Telnet and testing the SSHD restart to ensure a smooth upgrade process.

Created: 2025-03-17 by UserComp.com Editors

Safely Upgrading OpenSSH on a Remote Linux PC

This article covers the process of safely upgrading OpenSSH on a remote Linux PC, highlighting the key concepts and providing detailed context on the topic. We will discuss the importance of upgrading OpenSSH, the upgrade process, and how to test the new version.

Why Upgrade OpenSSH?

OpenSSH is a widely-used secure remote login protocol that is constantly being updated to address security vulnerabilities and improve functionality. By keeping OpenSSH up-to-date, you can ensure that your remote Linux PC is protected against known security threats and take advantage of new features and improvements.

Upgrade Process

The upgrade process for OpenSSH on a remote Linux PC typically involves the following steps:

Backup your current OpenSSH configuration and keys.
Update your package list.
Upgrade the OpenSSH package.
Restart the SSH service.

Filtering Telnet Temporarily

Before upgrading OpenSSH, it is recommended to filter Telnet temporarily as a backup access method. This can be done by running a script that will not restart the SSH service or require a reboot.


#!/bin/bash


iptables -A INPUT -p tcp --dport 23 -j DROP

This script will block incoming Telnet connections on port 23, providing an additional layer of security during the upgrade process.

Testing the New Version

After upgrading OpenSSH, it is important to test the new version to ensure that it is functioning correctly. This can be done by connecting to the remote Linux PC using SSH and verifying that the new version is being used.


$ ssh -V


OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f 31 Mar 2020

The output of this command should show the new version of OpenSSH that was installed.

Upgrading OpenSSH on a remote Linux PC is an important task that helps ensure the security and functionality of your system. By following the steps outlined in this article, you can safely upgrade OpenSSH and test the new version to ensure that it is functioning correctly.

References

OpenSSH: https://www.openssh.com/
Ubuntu OpenSSH upgrade: https://wiki.ubuntu.com/OpenSSH
SSH man page: https://man.openbsd.org/ssh

Tags: Linux OpenSSH Upgrade

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