V-253453 | Anonymous enumeration of SAM accounts must...

Microsoft Windows 11

Anonymous enumeration of SAM accounts must not be allowed

STIG ID: WN11-SO-000145 | SRG: SRG-OS-000480-GPOS-00227 | Severity: High | CCI: CCI-000366 | Vulnerability ID: V-253453

Description

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

Check

C-56906r829441_chk

If the following registry value does not exist or is not configured as specified, this is a finding:Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SYSTEM\CurrentControlSet\Control\Lsa\Value Name: RestrictAnonymousSAMValue Type: REG_DWORDValue: 1

Fix

F-56856r829442_fix

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".