KLA12311 Multiple vulnerabilities in Microsoft Developer Tools

Multiple vulnerabilities were found in Microsoft Developer Tools. Malicious users can exploit these vulnerabilities to execute arbitrary code, cause denial of service, obtain sensitive information.

Below is a complete list of vulnerabilities:

1. An information disclosure vulnerability in .NET Core and Visual Studio can be exploited remotely to obtain sensitive information.
2. A NULL pointer dereference in Microsoft Visual Studio can be exploited remotely to cause denial of service.
3. A NULL pointer dereference in signature algorithms processing can be exploited remotely to cause denial of service.
4. A CA certificate check bypass in Microsoft Visual Studio can be exploited remotely to obtain sensitive information.

Original advisories

CVE-2021-41355

CVE-2020-1971

CVE-2021-3449

CVE-2021-3450

Exploitation

Public exploits exist for this vulnerability.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Related products

Microsoft-Visual-Studio

CVE list

CVE-2021-41355 high

CVE-2020-1971 high

CVE-2021-3449 high

CVE-2021-3450 high

KB list

Solution

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

Impacts

• ACE

Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.

• OSI

Obtain sensitive information. Exploitation of vulnerabilities with this impact can lead to capturing by abuser information, critical for user or system.

• DoS

Denial of service. Exploitation of vulnerabilities with this impact can lead to loss of system availability or critical functional fault.

Affected Products

• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6).NET 5.0