Blog / New Vulnerability in OpenSSH: Vulnerability CVE-2024-6387

New Vulnerability in OpenSSH: Vulnerability CVE-2024-6387

by SW Team

New Vulnerability in OpenSSH: Remote Code Execution (RCE) Risk as Root on Linux Systems

Introduction to OpenSSH Vulnerability

A critical vulnerability has recently been discovered in OpenSSH, identified as CVE-2024-6387, which allows remote code execution (RCE) with root privileges on Linux systems.

This vulnerability has caused significant concern in the cybersecurity community.

Details of CVE-2024-6387 and How it Works

  • What is OpenSSH?

OpenSSH (Open Secure Shell) is essential for secure remote administration of servers and network devices using the SSH protocol. However, vulnerabilities can compromise its security, such as the recently discovered one.

The technical analysis of CVE-2024-6387 is due to a race condition in the OpenSSH signal handler, specifically related to the syslog() function and the handling of authentication timeout. This could allow an attacker to execute malicious code with root privileges.

  • Potential Impact of the Vulnerability

Root Access:

An attacker could take full control of the system, modify or delete files, and gain persistent access.

Information Theft:

Sensitive information can be compromised.

Network Propagation:

Use of the compromised server to attack other systems on the network.

Persistence of Attacks:

Attackers can maintain access to the compromised system and continue to steal data.


Solutions and Preventive Measures

Update and security patches

Updating to the latest versions of OpenSSH that include the security patch is critical. This will fix the vulnerability and prevent potential exploits.

Configuration and Best Practices

  • Limit SSH Access: Configure firewalls and IP restrictions to limit access.

  • Two-Factor Authentication (2FA): Add an extra layer of security.

  • Verify Configurations: Ensure that sshd configurations follow security best practices.

Monitoring and Incident Response

Implement monitoring and incident response (IR) systems to detect and mitigate attacks in real time.

Use security information and event management (SIEM) tools to analyze log data and detect anomalous behavior.

  • SIEM: Implement SIEM to manage security information and events.

  • Behavioral analysis:Detect suspicious activity that may indicate an exploitation attempt.

Update Management with SWPanel

SWPanel makes it easy to update your cloud server to protect it against CVE-20246-387.

SWPanel allows you to manage updates with a single click, ensuring the security of your server.

Steps to update with SWPanel: 1.

  1. Access the control panel: Go to your server's control panel in SWPanel.

  2. Select the "Manage Updates" icon to open the update management window.

  3. Automatic or manual updates:

Manual updates: View and apply pending updates by clicking the 'Automatic Update Service' button.

  1. Select "Update Now

  2. Schedule updates

Set the service update frequency to 1 time per month.

By using SWPanel, you can easily ensure that your server is up to date and protected against vulnerabilities such as CVE-2024-6387.


Steps to fix the vulnerability

For all customers who have a cloud server with Debian Panel 11 or higher, you can apply the security patch by following these steps.

  1. Update official Debian repositories
apt update
  1. Update the affected package `openssh-server
apt install openssh-server

**With SWPanel we guarantee that your server is always protected and up to date with one click.

Without the complications of upgrading a Debian server from scratch via the console.


In conclusion, CVE-2024-6387 underscores the importance of maintaining a proactive security posture. Prevention, continuous updating, and cybersecurity education are essential to protecting systems. Keeping our systems secure also requires vigilance.