CVE-2020-16886

PowerShellGet Module WDAC Security Feature Bypass Vulnerability

Description

A security feature bypass vulnerability exists in the PowerShellGet V2 module. An attacker who successfully exploited this vulnerability could bypass WDAC (Windows Defender Application Control) policy and execute arbitrary code on a policy locked-down machine. An attacker must have administrator privileges to create a configuration that includes installing PowerShellGet V2 module onto a machine from the PowerShell Gallery. The WDAC policy must be configured to allow the module to run. After this is done, PowerShell script can be injected and run fully trusted, allowing the attacker arbitrary code execution on the machine. The update addresses the vulnerability by changing how URLs are processed.

5.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.31%

Vendor Advisory microsoft.com

Affected: Microsoft PowerShellGet 2.2.5

References

Link	Tags
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16886	patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-16886?: CVE-2020-16886 has been scored as a medium severity vulnerability.
How to fix CVE-2020-16886?: To fix CVE-2020-16886, 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-2020-16886 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-16886 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-16886?: CVE-2020-16886 affects Microsoft PowerShellGet 2.2.5.

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