CVE-2019-0718 : Security Advisory and Response

A vulnerability in Microsoft Hyper-V Network Switch on a host server allows a privileged user on a guest operating system to send invalid input, resulting in a denial of service. This vulnerability is known as 'Windows Hyper-V Denial of Service Vulnerability' and has a distinct CVE ID that distinguishes it from other similar vulnerabilities.

Understanding CVE-2019-0718

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

What is CVE-2019-0718?

The vulnerability allows a privileged user on a guest OS to trigger a denial of service by sending invalid input to the Hyper-V Network Switch.

The Impact of CVE-2019-0718

A successful exploit could result in a denial of service condition on the host server.

Technical Details of CVE-2019-0718

This section provides technical details about the vulnerability.

Vulnerability Description

Microsoft Hyper-V Network Switch fails to properly validate input from a privileged user, leading to a denial of service vulnerability.

Affected Systems and Versions

Windows Server 2012, 2012 R2, 2016, 2019, and their Core installations are affected.
Windows 8.1, RT 8.1, and various versions of Windows 10 for x64-based systems are impacted.
Windows 10 Version 1903 for x64-based Systems and Windows Server version 1903 (Server Core installation) are also affected.

Exploitation Mechanism

A privileged user on a guest OS can exploit the vulnerability by sending invalid input to the Hyper-V Network Switch.

Mitigation and Prevention

Here are the steps to mitigate and prevent the CVE-2019-0718 vulnerability.

Immediate Steps to Take

Apply security updates provided by Microsoft to address the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access.
Regularly update and patch systems to prevent known vulnerabilities.

Patching and Updates

Ensure all affected systems are updated with the latest security patches from Microsoft.