SV-29729r2: The system must generate an audit event when the audit log reaches a percentage of full threshold. | Windows Vista Security Technical Implementation Guide

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Assessment Title

Rule Text

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

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000139Not mappedCCI-001855Not mappedCCI-001858CCE-3181-5

Additional Details

Responsibility

Information Assurance Officer

IA Controls

ECRR-1

References

DPMS Target Windows Vista DISA DPMS Target Windows Vista 1029

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.fso.windows:def:118
# The system must generate an audit event when the audit log reaches a percentage of full threshold.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Audit Log Warning Level
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\system\currentcontrolset\services\eventlog\security').GetValueKind('warninglevel').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\system\currentcontrolset\services\eventlog\security' -Name 'warninglevel' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'warninglevel') -le 90))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual windows_vista target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:118
$compliant = (Get-ItemProperty -Path 'HKLM:\system\currentcontrolset\services\eventlog\security' -Name 'warninglevel' -ErrorAction SilentlyContinue).warninglevel -le 90
if ($compliant) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

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.