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Caching of logon credentials must be limited.


Finding ID Version Rule ID IA Controls Severity
V-73651 WN16-MS-000050 SV-88315r1_rule Medium
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.
Windows Server 2016 Security Technical Implementation Guide 2020-06-16


Check Text ( C-73733r1_chk )
This applies to member servers. For domain controllers and standalone systems, this is NA.

If the following registry value does not exist or is not configured as specified, this is a finding.

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

Value Name: CachedLogonsCount

Value Type: REG_SZ
Value: 4 (or less)
Fix Text (F-80271r1_fix)
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 "4" logons or less.