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WN25-SO-000250 Windows Server 2025 must restrict anonymous access to Named Pipes and Shares.

DISA STIG library V1R4
All changes in this version
first version loaded CAT I

Maps to SC-4 via CCI-001090

Title

Windows Server 2025 must restrict anonymous access to Named Pipes and Shares.

Control

If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\LanManServer\Parameters\ Value Name: RestrictNullSessAccess Value Type: REG_DWORD Value: 0x00000001 (1)

Discussion

Allowing anonymous access to named pipes or shares provides the potential for unauthorized system access. This setting restricts access to those defined in "Network access: Named Pipes that can be accessed anonymously" and "Network access: Shares that can be accessed anonymously", both of which must be blank under other requirements.

Related controls

CCI-001090

Fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network access: Restrict anonymous access to Named Pipes and Shares to "Enabled".