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V-205914

CAT I (High)

Windows Server 2019 must not allow anonymous enumeration of Security Account Manager (SAM) accounts.

Rule ID

SV-205914r991589_rule

STIG

Microsoft Windows Server 2019 Security Technical Implementation Guide

Version

V3R8

CCIs

CCI-000366

Discussion

Anonymous enumeration of SAM accounts allows anonymous logon users (null session connections) to list all accounts names, thus providing a list of potential points to attack the system.

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\Control\Lsa\

Value Name: RestrictAnonymousSAM

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: Do not allow anonymous enumeration of SAM accounts" to "Enabled".