SV-225463r569185: The Ctrl+Alt+Del security attention sequence for logons must be enabled. | Microsoft Windows Server 2012/2012 R2 Member Server STIG SCAP Benchmark

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Assessment Title

Rule Text

The Ctrl+Alt+Del security attention sequence for logons must be enabled.

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, a user can be assured that any passwords entered following that sequence are sent only to Windows. If the sequence requirement is eliminated, malicious programs can request and receive a user's 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-25803-8SV-52866V-1154

References

DPMS Target Microsoft Windows Server 2012-2012 R2 MS DISA DPMS Target Microsoft Windows Server 2012-2012 R2 MS 4214

Checks

OVAL

oval:mil.disa.fso.windows:var:455400 ← xccdf_mil.disa.stig_value_do_not_require_ctrlaltdel_var

DISA STIG (Manual Reference)

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\CurrentVersion\Policies\System\

Value Name: DisableCAD

Value Type: REG_DWORD
Value: 0

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:4554
# The Ctrl+Alt+Del security attention sequence for logons must be enabled.
# 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"
}

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".