SV-221588r1106670: Download restrictions must be configured. | Google Chrome Current Windows STIG SCAP Benchmark

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Assessment Title

Rule Text

Download restrictions must be configured.

Description

Discussion Text

Setting the policy means users cannot bypass download security decisions. There are many types of download warnings within Chrome, which roughly break down into these categories: - Malicious, as flagged by the Safe Browsing server. - Uncommon or unwanted, as flagged by the Safe Browsing server. - A dangerous file type (e.g., all SWF downloads and many EXE downloads). Setting the policy blocks different subsets of these, depending on its value: 0 = No special restrictions. Default. 1 = Block malicious downloads and dangerous file types. 2 = Block malicious downloads, uncommon or unwanted downloads, and dangerous file types. 3 = Block all downloads. 4 = Block malicious downloads. Recommended.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000169SV-94635V-79931

References

DPMS Target Google Chrome Current Windows DISA DPMS Target Google Chrome Current Windows 4081

Checks

DISA STIG (Manual Reference)

If the system is on the SIPRNet, this requirement is Not Applicable.

Universal method:
1. In the omnibox (address bar) type "chrome:// policy".
2. If "DownloadRestrictions" is not displayed under the "Policy Name" column or it is set to "0", this is a finding.

Windows method:
1. Start "regedit".
2. Navigate to "HKLM\Software\Policies\Google\Chrome\".
3. If the "DownloadRestrictions" value name does not exist or its value data is set to "0", this is a finding.

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.stig.chrome:def:610055
# Download restrictions must be configured.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Registry check
# 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\Policies\Google\Chrome').GetValueKind('DownloadRestrictions').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'DownloadRestrictions' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DownloadRestrictions') -eq 1)) -or (((@{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\Policies\Google\Chrome').GetValueKind('DownloadRestrictions').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'DownloadRestrictions' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DownloadRestrictions') -eq 2)) -or (((@{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\Policies\Google\Chrome').GetValueKind('DownloadRestrictions').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'DownloadRestrictions' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DownloadRestrictions') -eq 3)) -or (((@{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\Policies\Google\Chrome').GetValueKind('DownloadRestrictions').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'DownloadRestrictions' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DownloadRestrictions') -eq 4)))
}

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 google_chrome target this check assesses.

# OVAL Definition: oval:mil.disa.stig.chrome:def:610055
$compliant = 0
if (!(Test-Path -Path 'env:SIPRNET')) { $compliant = (Get-ItemProperty -Path 'HKLM:\Software\Policies\Google\Chrome' -Name 'DownloadRestrictions' -ErrorAction SilentlyContinue).DownloadRestrictions -match '^(1|2|3|4)$'
}
if ($compliant) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

If the system is on the SIPRNet, this requirement is Not Applicable.

Windows group policy:
1. Open the group policy editor tool with gpedit.msc.
2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Google\Google Chrome\
Policy Name: Allow download restrictions
Policy State: 1, 2, or 4
Policy Value: N/A