CVE-2021-43877 : Vulnerability Insights and Analysis

ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability discovered on December 14, 2021.

Understanding CVE-2021-43877

What is CVE-2021-43877?

The CVE-2021-43877 is an Elevation of Privilege vulnerability affecting various versions of Microsoft Visual Studio and ASP.NET Core.

The Impact of CVE-2021-43877

This vulnerability has a CVSS base severity rating of HIGH (8.8) and can allow attackers to elevate privileges on the affected systems.

Technical Details of CVE-2021-43877

Vulnerability Description

The vulnerability exists in the software, allowing unauthorized users to gain elevated privileges.

Affected Systems and Versions

Microsoft Visual Studio 2019 version 16.7 (includes 16.0 - 16.6)
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)
Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)
Microsoft Visual Studio 2022 version 17.0
ASP.NET Core 3.1
ASP.NET Core 5.0
ASP.NET Core 6.0
Microsoft Visual Studio 2022 version 17.1

Exploitation Mechanism

The vulnerability can be exploited by malicious actors to execute arbitrary code and gain unauthorized access.

Mitigation and Prevention

Immediate Steps to Take

Apply the necessary security updates provided by Microsoft.
Monitor and restrict access to the vulnerable systems.

Long-Term Security Practices

Implement the principle of least privilege to limit user access.
Regularly update and patch software to prevent exploitation.
Conduct security assessments and audits to identify vulnerabilities.

Patching and Updates

It is crucial to install the latest security patches and updates released by Microsoft to mitigate the CVE-2021-43877 vulnerability.