Ensure 'Control use of JavaScript JIT' is set to 'Enabled: Do not allow any site to run JavaScript JIT'

SedangLevel 2Otomatisedge

Deskripsi

This policy setting specifies whether Microsoft Edge will run the v8 JavaScript engine with JIT (Just In Time) compiler. JIT is a complex pipeline of processes used to optimize JavaScript code for performance. Rationale: Microsoft's research has revealed that attackers usually target the JavaScript engine called “Just-In-Time (JIT) compilation” to hack web browsers. Disabling the JavaScript just-in-time (JIT) compiler prevents attackers from hacking into systems that Microsoft Edge uses. Audit reads the Group Policy registry value and prints 'compliant', 'unset' (policy not configured, reported as FAIL) or the non-compliant value. Registry value: HKLM\SOFTWARE\Policies\Microsoft\Edge:DefaultJavaScriptJitSetting (REG_DWORD); compliant when it is 2. Remediation writes 2 locally; in a domain set it through the ADMX so Group Policy does not revert it.

Cara pemeriksaan

Metode audit: Registry Windows

registry

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge' -Name 'DefaultJavaScriptJitSetting' -ErrorAction SilentlyContinue).'DefaultJavaScriptJitSetting'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @(2) -contains [int64]$v)) { 'compliant' } else { "non-compliant: $v" }

Output yang diharapkan: compliant

Cara perbaikan

Metode perbaikan: Perintah shell

shell

$p = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge'; if (-not (Test-Path -Path $p)) { New-Item -Path $p -Force | Out-Null }; New-ItemProperty -Path $p -Name 'DefaultJavaScriptJitSetting' -Value 2 -PropertyType DWord -Force | Out-Null

Properti

Sistem operasi: Apa saja
Tag: edgebrowsercis-l2
Referensi: CIS Microsoft Edge Benchmark v5.0.0 - 1.4.4 Ensure 'Control use of JavaScript JIT' is set to 'Enabled: Do not allow any site to run JavaScript JIT'

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shell

tmaegis scan --target edge --level 2