Microsoft Windows Server 2025

Windows Server 2025 must not allow anonymous enumeration of shares

STIG ID: WN25-SO-000230 | SRG: SRG-OS-000138-GPOS-00069 | Severity: High | CCI: CCI-001090 | Vulnerability ID: V-278217

Description

Allowing anonymous logon users (null session connections) to list all account names and enumerate all shared resources can provide a map of potential points to attack the system.

Check

C-82747r1181355_chk

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: RestrictAnonymous

Value Type: REG_DWORD
Value: 0x00000001 (1)

Fix

F-82652r1181356_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 and shares to "Enabled".