The Windows PowerShell 2.0 feature must be disabled on the system.

Documentable No

Rule ID SV-253285r1153425_rule

CCI References

CCI-000381

Discussion

Windows PowerShell 5.0 added advanced logging features, which can provide additional detail when malware has been run on a system. Disabling the Windows PowerShell 2.0 mitigates against a downgrade attack that evades the Windows PowerShell 5.0 script block logging feature.

Check Procedure

For Windows 11 version 24H2 and newer, this requirement is Not Applicable.

Run "Windows PowerShell" with elevated privileges (run as administrator).

Enter the following:
Get-WindowsOptionalFeature -Online | Where FeatureName -like *PowerShellv2*

If either of the following have a "State" of "Enabled", this is a finding.

FeatureName : MicrosoftWindowsPowerShellV2
State : Enabled
FeatureName : MicrosoftWindowsPowerShellV2Root
State : Enabled

Alternately:
Search for "Features".

Select "Turn Windows features on or off".

If "Windows PowerShell 2.0" (whether the subcategory of "Windows PowerShell 2.0 Engine" is selected or not) is selected, this is a finding.

Fix Action

Disable "Windows PowerShell 2.0" on the system.

Run "Windows PowerShell" with elevated privileges (run as administrator).
Enter the following:
Disable-WindowsOptionalFeature -Online -FeatureName MicrosoftWindowsPowerShellV2Root

This command must disable both "MicrosoftWindowsPowerShellV2Root" and "MicrosoftWindowsPowerShellV2", which correspond to "Windows PowerShell 2.0" and "Windows PowerShell 2.0 Engine" respectively in "Turn Windows features on or off".

Alternately:
Search for "Features".
Select "Turn Windows features on or off".
De-select "Windows PowerShell 2.0".