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V-220923

CAT III (Low)

Caching of logon credentials must be limited.

Rule ID

SV-220923r569187_rule

STIG

Microsoft Windows 10 Security Technical Implementation Guide

Version

V2R9

CCIs

CCI-000366

Discussion

The default Windows configuration caches the last logon credentials for users who log on interactively to a system. This feature is provided for system availability reasons, such as the user's machine being disconnected from the network or domain controllers being unavailable. Even though the credential cache is well-protected, if a system is attacked, an unauthorized individual may isolate the password to a domain user account using a password-cracking program and gain access to the domain.

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This is the default configuration for this setting (10 logons to cache).

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:  \SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\

Value Name:  CachedLogonsCount

Value Type:  REG_SZ
Value:  10 (or less)

This setting only applies to domain-joined systems, however, it is configured by default on all systems.

Fix Text

This is the default configuration for this setting (10 logons to cache).

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Interactive logon: Number of previous logons to cache (in case domain controller is not available)" to "10" logons or less.

This setting only applies to domain-joined systems, however, it is configured by default on all systems.