The system must generate an audit event when the audit log reaches a percentage of full threshold.

From Windows 8/8.1 Security Technical Implementation Guide

Part of Audit Log Warning Level

Associated with IA controls: ECRR-1

Associated with: CCI-000139 CCI-001855 CCI-001858

SV-48121r2_rule The system must generate an audit event when the audit log reaches a percentage of full threshold.

Vulnerability discussion

Audit records may be lost if the security log becomes full. When the audit log reaches a given percent full, an audit event is written to the security log. An event is recorded as a success audit under the category of System. This option may be especially useful if the audit logs are set to be cleared manually.

Check content

If the system is configured to send audit records directly to an audit server, or automatically archive full logs, this is NA. This must be documented with the ISSO. 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. (See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.) If the value for "MSS: (WarningLevel) Percentage threshold for the security event log at which the system will generate a warning" is not set to "90%" or less, this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\Eventlog\Security\ Value Name: WarningLevel Value Type: REG_DWORD Value: 0x0000005a (90) (or less)

Fix text

If the system is configured to send audit records directly to an audit server, or automatically archive full logs, this is NA. This must be documented with the ISSO. Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (WarningLevel) Percentage threshold for the security event log at which the system will generate a warning" to "90%" or less.

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