CVE-2020-0951

Windows Defender Application Control Security Feature Bypass Vulnerability

Description

A security feature bypass vulnerability exists in Windows Defender Application Control (WDAC) which could allow an attacker to bypass WDAC enforcement. An attacker who successfully exploited this vulnerability could execute PowerShell commands that would be blocked by WDAC. To exploit the vulnerability, an attacker need administrator access on a local machine where PowerShell is running. The attacker could then connect to a PowerShell session and send commands to execute arbitrary code. The update addresses the vulnerability by correcting how PowerShell commands are validated when WDAC protection is enabled.

6.7

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 3.38% Top 15%

Vendor Advisory microsoft.com

Affected: Microsoft Windows 10 Version 1803

Affected: Microsoft Windows 10 Version 1809

Affected: Microsoft Windows Server 2019

Affected: Microsoft Windows Server 2019 (Server Core installation)

Affected: Microsoft Windows 10 Version 1909

Affected: Microsoft Windows Server, version 1909 (Server Core installation)

Affected: Microsoft Windows 10 Version 1709 for 32-bit Systems

Affected: Microsoft Windows 10 Version 1709

Affected: Microsoft Windows 10 Version 1903 for 32-bit Systems

Affected: Microsoft Windows 10 Version 1903 for x64-based Systems

Affected: Microsoft Windows 10 Version 1903 for ARM64-based Systems

Affected: Microsoft Windows Server, version 1903 (Server Core installation)

Affected: Microsoft Windows 10 Version 2004

Affected: Microsoft Windows Server version 2004

Affected: Microsoft Windows 10 Version 1607

Affected: Microsoft Windows Server 2016

Affected: Microsoft Windows Server 2016 (Server Core installation)

Affected: Microsoft PowerShell 7.0

Affected: Microsoft PowerShell 7.1

References

Link	Tags
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0951	patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-0951?: CVE-2020-0951 has been scored as a medium severity vulnerability.
How to fix CVE-2020-0951?: To fix CVE-2020-0951, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-0951 being actively exploited in the wild?: It is possible that CVE-2020-0951 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-0951?: CVE-2020-0951 affects Microsoft Windows 10 Version 1803, Microsoft Windows 10 Version 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2019 (Server Core installation), Microsoft Windows 10 Version 1909, Microsoft Windows Server, version 1909 (Server Core installation), Microsoft Windows 10 Version 1709 for 32-bit Systems, Microsoft Windows 10 Version 1709, Microsoft Windows 10 Version 1903 for 32-bit Systems, Microsoft Windows 10 Version 1903 for x64-based Systems, Microsoft Windows 10 Version 1903 for ARM64-based Systems, Microsoft Windows Server, version 1903 (Server Core installation), Microsoft Windows 10 Version 2004, Microsoft Windows Server version 2004, Microsoft Windows 10 Version 1607, Microsoft Windows Server 2016, Microsoft Windows Server 2016 (Server Core installation), Microsoft PowerShell 7.0, Microsoft PowerShell 7.1.