Title

Windows Server 2019 must restrict anonymous access to Named Pipes and Shares. (Cat I impact)

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.

Check Content

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)

Fix Text

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".

Additional Identifiers

Rule ID: SV-205725r569188_rule

Vulnerability ID: V-205725

Group Title: SRG-OS-000138-GPOS-00069

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.