V-253360 | Insecure logons to an SMB server must be d...

Microsoft Windows 11

Insecure logons to an SMB server must be disabled

STIG ID: WN11-CC-000040 | SRG: SRG-OS-000480-GPOS-00227 | Severity: Medium | CCI: CCI-000366 | Vulnerability ID: V-253360

Description

Insecure guest logons allow unauthenticated access to shared folders. Shared resources on a system must require authentication to establish proper access.

Check

C-56813r829162_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: \SOFTWARE\Policies\Microsoft\Windows\LanmanWorkstation\Value Name: AllowInsecureGuestAuthType: REG_DWORDValue: 0x00000000 (0)

Fix

F-56763r829163_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Lanman Workstation >> "Enable insecure guest logons" to "Disabled".