CentOS 7 Upgrade Openssh To 9.3p2

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Introduction

As a Linux administrator, it's essential to stay up-to-date with the latest security patches and updates to ensure the security and stability of your systems. In this article, we'll walk you through the process of upgrading OpenSSH to version 9.3p2 on CentOS 7, which is necessary due to the recent CVE-2023-38408 vulnerability.

Why Upgrade OpenSSH?

OpenSSH is a widely used secure shell protocol that allows secure remote access to Linux systems. However, with the increasing number of security vulnerabilities, it's crucial to keep your OpenSSH version up-to-date to prevent potential security breaches. The CVE-2023-38408 vulnerability is a significant security issue that affects OpenSSH versions prior to 9.3p2. Upgrading to the latest version will ensure that your system is protected against this vulnerability and other potential security threats.

Prerequisites

Before you begin the upgrade process, ensure that your system meets the following prerequisites:

  • CentOS 7 installed
  • Internet connectivity
  • Root privileges

Step 1: Install Development Tools

To upgrade OpenSSH, you'll need to install the necessary development tools. Run the following command to install the required packages:

yum groupinstall -y "Development Tools"

This command will install the necessary development tools, including GCC, make, and other dependencies required for building OpenSSH.

Step 2: Install Required Packages

Next, install the required packages, including zlib-devel, openssl-devel, and wget:

yum install -y zlib-devel openssl-devel wget

These packages are necessary for building and installing OpenSSH.

Step 3: Download the OpenSSH Source Code

Download the OpenSSH source code from the official website:

wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-9.3p2.tar.gz

This command will download the OpenSSH 9.3p2 source code.

Step 4: Extract the OpenSSH Source Code

Extract the OpenSSH source code using the following command:

tar -xvf openssh-9.3p2.tar.gz

This command will extract the OpenSSH source code to a directory named openssh-9.3p2.

Step 5: Configure and Build OpenSSH

Configure and build OpenSSH using the following commands:

cd openssh-9.3p2
./configure --prefix=/usr/local/openssh-9.3p2
make

These commands will configure and build OpenSSH with the specified prefix.

Step 6: Install OpenSSH

Install OpenSSH using the following command:

make install

This command will install OpenSSH to the specified prefix.

Step 7: Update SSH Configuration

Update the SSH configuration to use the new OpenSSH version:

cp /etc/ssh/sshd_config /etc/ssh/sshd_config.backup
cp openssh-9.3p2/contrib/sshd_config /etc/ssh```

This command will update the SSH configuration to use the new OpenSSH version.


Step 8: Restart SSH Service


Restart the SSH service to apply the changes:


systemctl restart sshd
</code></pre>
<p>This command will restart the SSH service.</p>
<h2><strong>Conclusion</strong></h2>
<p>Upgrading OpenSSH to version 9.3p2 on CentOS 7 is a crucial step in ensuring the security and stability of your system. By following the steps outlined in this article, you'll be able to upgrade OpenSSH and protect your system against potential security threats. Remember to always keep your system up-to-date with the latest security patches and updates to ensure the security and stability of your systems.</p>
<h2><strong>Troubleshooting</strong></h2>
<p>If you encounter any issues during the upgrade process, refer to the OpenSSH documentation or seek assistance from a Linux administrator or a support forum.</p>
<h2><strong>Additional Resources</strong></h2>
<ul>
<li>OpenSSH documentation: <a href="https://www.openssh.com/">https://www.openssh.com/</a></li>
<li>CentOS documentation: <a href="https://docs.centos.org/">https://docs.centos.org/</a></li>
<li>Linux administration resources: <a href="https://www.linux.org/">https://www.linux.org/</a><br/>
<strong>Frequently Asked Questions: Upgrading OpenSSH to 9.3p2 on CentOS 7</strong>
====================================================================</li>
</ul>
<h2><strong>Q: Why do I need to upgrade OpenSSH to 9.3p2?</strong></h2>
<p>A: OpenSSH 9.3p2 is necessary to address the CVE-2023-38408 vulnerability, which affects OpenSSH versions prior to 9.3p2. Upgrading to the latest version will ensure that your system is protected against this vulnerability and other potential security threats.</p>
<h2><strong>Q: What are the system requirements for upgrading OpenSSH to 9.3p2?</strong></h2>
<p>A: To upgrade OpenSSH to 9.3p2, you'll need:</p>
<ul>
<li>CentOS 7 installed</li>
<li>Internet connectivity</li>
<li>Root privileges</li>
</ul>
<h2><strong>Q: How do I install the necessary development tools?</strong></h2>
<p>A: To install the necessary development tools, run the following command:</p>
<pre><code class="hljs">yum groupinstall -y &quot;Development Tools&quot;
</code></pre>
<p>This command will install the necessary development tools, including GCC, make, and other dependencies required for building OpenSSH.</p>
<h2><strong>Q: What packages do I need to install for OpenSSH?</strong></h2>
<p>A: You'll need to install the following packages:</p>
<ul>
<li>zlib-devel</li>
<li>openssl-devel</li>
<li>wget</li>
</ul>
<p>You can install these packages using the following command:</p>
<pre><code class="hljs">yum install -y zlib-devel openssl-devel wget
</code></pre>
<h2><strong>Q: How do I download the OpenSSH source code?</strong></h2>
<p>A: You can download the OpenSSH source code from the official website using the following command:</p>
<pre><code class="hljs">wget https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-9.3p2.tar.gz
</code></pre>
<h2><strong>Q: How do I extract the OpenSSH source code?</strong></h2>
<p>A: You can extract the OpenSSH source code using the following command:</p>
<pre><code class="hljs">tar -xvf openssh-9.3p2.tar.gz
</code></pre>
<h2><strong>Q: How do I configure and build OpenSSH?</strong></h2>
<p>A: You can configure and build OpenSSH using the following commands:</p>
<pre><code class="hljs">cd openssh-9.3p2
./configure --prefix=/usr/local/openssh-9.3p2
make
</code></pre>
<h2><strong>Q: How do I install OpenSSH?</strong></h2>
<p>A: You can install OpenSSH using the following command:</p>
<pre><code class="hljs">make install
</code></pre>
<h2><strong>Q: How do I update the SSH configuration?</strong></h2>
<p>A: You can update the SSH configuration to use the new OpenSSH version by copying the new configuration file:</p>
<pre><code class="hljs">cp /etc/ssh/sshd_config /etc/ssh/sshd_config.backup
cp openssh-9.3p2/contrib/sshd_config /etc/ssh
</code></pre>
<h2><strong>Q: How do I restart the SSH service?</strong></h2>
<p>A: You can restart the SSH service using the following command:</p>
<pre><code class="hljs">systemctl restart sshd
</code></pre>
<h2><strong>Q: What if I encounter issues during the upgrade process?</strong></h2>
<p>A: If you encounter any issues during the upgrade process, refer to the OpenSSH documentation or seek assistance from a Linux administrator or a support forum.</p>
<h2><strong>Q: Where can I find additional resources for upgrading OpenSSH?</strong></h2>
<p>A You can find additional resources for upgrading OpenSSH on the following websites:</p>
<ul>
<li>OpenSSH documentation: <a href="https://www.openssh.com/">https://www.openssh.com/</a></li>
<li>CentOS documentation: <a href="https://docs.centos.org/">https://docs.centos.org/</a></li>
<li>Linux administration resources: <a href="https://www.linux.org/">https://www.linux.org/</a></li>
</ul>