The system must be configured to prevent the storage of the LAN Manager hash of passwords.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3379	WN08-SO-000065	SV-48081r1_rule	ECSC-1	High

Description
The LAN Manager hash uses a weak encryption algorithm and there are several tools available that use this hash to retrieve account passwords. This setting controls whether or not a LAN Manager hash of the password is stored in the SAM the next time the password is changed.

STIG	Date
Windows 8/8.1 Security Technical Implementation Guide	2018-02-12

Details

Check Text ( C-44820r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Network security: Do not store LAN Manager hash value on next password change" is not set to "Enabled", this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Control\Lsa\ Value Name: NoLMHash Value Type: REG_DWORD Value: 1

Check Text ( C-44820r1_chk )

Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.)
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for "Network security: Do not store LAN Manager hash value on next password change" is not set to "Enabled", this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Control\Lsa\

Value Name: NoLMHash

Value Type: REG_DWORD
Value: 1

Fix Text (F-41219r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Network security: Do not store LAN Manager hash value on next password change" to "Enabled".