CVE-2019-0723 : Security Advisory and Response

A security weakness in the Microsoft Hyper-V Network Switch on a host server has been identified, leading to a denial of service attack. This vulnerability is known as 'Windows Hyper-V Denial of Service Vulnerability' and has a separate CVE ID from other related vulnerabilities.

Understanding CVE-2019-0723

This CVE pertains to a denial of service vulnerability in the Microsoft Hyper-V Network Switch.

What is CVE-2019-0723?

This vulnerability arises when input from a privileged user on a guest operating system is not adequately verified, allowing for a denial of service attack.

The Impact of CVE-2019-0723

The vulnerability can result in a denial of service attack on the host server running the Microsoft Hyper-V Network Switch.

Technical Details of CVE-2019-0723

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability in the Microsoft Hyper-V Network Switch allows for a denial of service attack due to inadequate input validation from a privileged user on a guest operating system.

Affected Systems and Versions

Windows 7 for x64-based Systems Service Pack 1
Windows 8.1 for x64-based systems
Windows 10 for x64-based Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1703 for x64-based Systems
Windows 10 Version 1709 for x64-based Systems
Windows 10 Version 1803 for x64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2012
Windows Server 2012 (Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Core installation)
Windows Server 2016
Windows Server 2016 (Core installation)
Windows Server version 1803 (Core Installation)
Windows Server 2019
Windows Server 2019 (Core installation)
Windows 10 Version 1903 for x64-based Systems
Windows Server, version 1903 (Server Core installation)

Exploitation Mechanism

The vulnerability is exploited by sending malicious input from a privileged user on a guest operating system to the Microsoft Hyper-V Network Switch, causing a denial of service.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-0723 vulnerability.

Immediate Steps to Take

Apply security patches provided by Microsoft promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and systems.
Conduct security training for users to recognize and report suspicious activities.
Implement access controls to restrict privileged user actions.

Patching and Updates

Microsoft may release security updates to address the vulnerability; ensure timely installation of these patches.