CVE-2020-0796 Explained : Impact and Mitigation

A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.

Understanding CVE-2020-0796

This CVE involves a critical remote code execution vulnerability in the SMBv3 protocol used by Windows systems.

What is CVE-2020-0796?

CVE-2020-0796 is a remote code execution vulnerability in the Microsoft Server Message Block 3.1.1 (SMBv3) protocol.

The Impact of CVE-2020-0796

This vulnerability can allow remote attackers to execute arbitrary code on vulnerable systems, potentially leading to complete compromise of the affected system.

Technical Details of CVE-2020-0796

This section covers the technical aspects of the CVE.

Vulnerability Description

The vulnerability exists in the way SMBv3 protocol handles certain requests, enabling remote code execution.

Affected Systems and Versions

The following systems are affected by this vulnerability:

Windows 10 Version 1903 for 32-bit Systems
Windows 10 Version 1903 for x64-based Systems
Windows 10 Version 1903 for ARM64-based Systems
Windows Server, version 1903 (Server Core installation)
Windows 10 Version 1909 for 32-bit Systems
Windows 10 Version 1909 for x64-based Systems
Windows 10 Version 1909 for ARM64-based Systems
Windows Server, version 1909 (Server Core installation)

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted requests to the SMBv3 server, leading to remote code execution.

Mitigation and Prevention

Here are steps to mitigate and prevent exploitation of CVE-2020-0796.

Immediate Steps to Take

Apply the latest security updates provided by Microsoft.
Implement network segmentation to restrict SMB traffic.
Consider blocking SMB ports from external access.

Long-Term Security Practices

Regularly update and patch systems to address security vulnerabilities.
Monitor and restrict incoming and outgoing SMB traffic.

Patching and Updates

Ensure that systems are patched with the latest updates from Microsoft to prevent exploitation of this vulnerability.