SV-234701r615937: Chrome must be configured to allow only TLS. | Google Chrome Current Windows Security Technical Implementation Guide

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Assessment Title

Rule Text

Chrome must be configured to allow only TLS.

Description

Discussion Text

If this policy is not configured then Google Chrome uses a default minimum version, which is TLS 1.0. Otherwise, it may be set to one of the following values: "tls1", "tls1.1" or "tls1.2". When set, Google Chrome will not use SSL/TLS versions less than the specified version. An unrecognized value will be ignored. "tls1" = TLS 1.0 "tls1.1" = TLS 1.1 "tls1.2" = TLS 1.2

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

IA Controls

NIST SP 800-53

Not mappedCCI-002450V-81583

References

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

Checks

DISA STIG (Manual Reference)

Universal method: 
 1. In the omnibox (address bar) type chrome://policy
 2. If "SSLVersionMin" is not displayed under the "Policy Name" column or it is not set to "tls1.2", this is a finding.
Windows method:
 1. Start regedit
 2. Navigate to HKLM\Software\Policies\Google\Chrome\
 3. If the "SSLVersionMin" value name does not exist or its value data is not set to "tls1.2", 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:124
# Chrome must be configured to allow only TLS.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Minimum SSL version enabled is enabled and set to TLS 1.2
# 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('SSLVersionMin').ToString()]) -eq 'reg_sz') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome' -Name 'SSLVersionMin' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'SSLVersionMin') -eq 'tls1.2'))
}

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_windows target this check assesses.

# OVAL Definition: oval:mil.disa.stig.chrome:def:124
$chromePolicyPath = "HKLM:\SOFTWARE\Policies\Google\Chrome"
$regKey = "SSLVersionMin"
$expectedValue = "tls1.2"
if (Test-Path $chromePolicyPath -PathType Container) {
    $regValue = Get-ItemProperty -Path "$chromePolicyPath\$regKey" -Name $regKey -ErrorAction SilentlyContinue
    if ($regValue -and $regValue.$regKey -eq $expectedValue) {
        Write-Output "PASS"
        Exit 0
    }
}
Write-Output "FAIL"
Exit 1

Remediation

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: Minimum SSL version enabled
 Policy State: Enabled
 Policy Value: TLS 1.2