The built-in Windows password complexity policy must be enabled.

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-000192 CCI-000193 CCI-000194 CCI-001619

SV-87975r1_rule The built-in Windows password complexity policy must be enabled.

Vulnerability discussion

The use of complex passwords increases their strength against attack. The built-in Windows password complexity policy requires passwords to contain at least three of the four types of characters (numbers, upper- and lower-case letters, and special characters) and prevents the inclusion of user names or parts of user names.Satisfies: SRG-OS-000069-GPOS-00037, SRG-OS-000070-GPOS-00038, SRG-OS-000071-GPOS-00039, SRG-OS-000266-GPOS-00101

Check content

Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Navigate to Local Computer Policy >> Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy. If the value for "Password must meet complexity requirements" is not set to "Enabled", this is a finding. Note: If an external password filter is in use that enforces all four character types and requires this setting to be set to "Disabled", this would not be considered a finding. If this setting does not affect the use of an external password filter, it must be enabled for fallback purposes.

Fix text

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Password must meet complexity requirements" to "Enabled".

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