Security Update for Windows Defender (June 2021)

high Nessus Plugin ID 150359
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

An antimalware application installed on the remote host is affected by multiple vulnerabilities.

Description

The Malware Protection Engine version of Microsoft Windows Defender installed on the remote Windows host is equal or prior to 1.1.17800.5. It is, therefore, affected by multiple vulnerabilities.

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-31985)
- A denial of service (DoS) vulnerability. An attacker can exploit this issue to cause the affected component to deny system or application services. (CVE-2021-31978)

Solution

Enable automatic updates to update the malware engine for the relevant antimalware applications. Refer to Knowledge Base Article 2510781 for information on how to verify that MMPE has been updated.

See Also

http://www.nessus.org/u?db0f474f

http://www.nessus.org/u?51ebd435

Plugin Details

Severity: High

ID: 150359

File Name: smb_nt_ms21_june_win_defender.nasl

Version: 1.6

Type: local

Agent: windows

Family: Windows

Published: 6/8/2021

Updated: 8/12/2021

Dependencies: microsoft_windows_defender_win_installed.nbin

Risk Information

CVSS Score Source: CVE-2021-31985

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: E:POC/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:microsoft:windows, cpe:/a:microsoft:windows_defender

Required KB Items: installed_sw/Windows Defender

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/8/2021

Vulnerability Publication Date: 6/8/2021

Reference Information

CVE: CVE-2021-31978, CVE-2021-31985

IAVA: 2021-A-0273-S