SV-25045r1: Ctrl+Alt+Del security attention sequence is disabled. | Windows 7 Security Technical Implementation Guide

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Assessment Title

Rule Text

Ctrl+Alt+Del security attention sequence is disabled.

Description

Discussion Text

Disabling the Ctrl+Alt+Del security attention sequence can compromise system security. Because only Windows responds to the Ctrl+Alt+Del security sequence, you can be assured that any passwords you enter following that sequence are sent only to Windows. If you eliminate the sequence requirement, malicious programs can request and receive your Windows password. Disabling this sequence also suppresses a custom logon banner.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366CCE-9317-9

Additional Details

Third-Party Tools

Responsibility

System Administrator

References

DPMS Target Windows 7 DISA DPMS Target Windows 7 1712

Checks

OVAL

oval:mil.disa.fso.windows:var:369100 ← xccdf_mil.disa.stig_value_do_not_require_ctrlaltdel_var

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:3691
# Ctrl+Alt+Del security attention sequence is disabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Interactive logon: Do not require CTRL+ALT+DEL' is set to 'Disabled'
# 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\Software\Microsoft\Windows\CurrentVersion\Policies\System').GetValueKind('DisableCAD').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'DisableCAD' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableCAD') -eq 0))
}

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_7 target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:3691
$registryPath = "HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System"
$registryValueName = "DisableCAD"
if (Test-Path $registryPath) {
    $registryValue = Get-ItemProperty -Path $registryPath -Name $registryValueName -ErrorAction SilentlyContinue
    if ($registryValue -and $registryValue.$registryValueName -eq 0) {
        Write-Output "PASS"
        exit 0
    }
}
Write-Output "FAIL"
exit 1

Remediation

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Interactive Logon: Do not require CTRL ALT DEL” to “Disabled”.