V-205914
SV-205914r991589_rule
CAT I
Windows Server 2019 must not allow anonymous enumeration of Security Account Manager (SAM) accounts.
From: Microsoft Windows Server 2019 Security Technical Implementation Guide (V3R8)
Description
<VulnDiscussion>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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
Check Procedure
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".
CCI Reference
CCI-000366- Created
- 2026-04-07 20:08:25
- Last Updated
- 2026-04-07 20:08:25