Patch

CVE-2020-0796

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Vulnerability Overview

CVE Name

CVE-2020-0796

Severity

Critical

CVE Description

A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796

Date

27.03.2020

Script

Script Type

Remediation script

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The following PowerShell script helps prevent CVE-2020-0796 Which is a remote code execution in SMBv3 by disabling compression and this mitigation blocks unauthenticated attackers from exploiting CVE-2020-0796

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$isAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)

if (-not $isAdmin) {
    Write-Host "This script requires administrative privileges to modify registry settings."
    Write-Host "Please run the script as an administrator and try again."
    exit
}

$requiredKBs = @("KB4499164", "KB4499175", "KB4499149", "KB4499180")

$missingKBs = @()
$installedKBs = Get-HotFix | Select-Object -ExpandProperty HotFixID

foreach ($kb in $requiredKBs) {
    if (-not ($installedKBs -contains $kb)) {
        $missingKBs += $kb
    }
}

if ($missingKBs.Count -gt 0) {
    Write-Host "The following KB updates are missing: $($missingKBs -join ', '). Applying the mitigation..."

# Disable SMB3 compression
    Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" -Name DisableCompression -Type DWORD -Value 1 -Force

Write-Host "SMB3 compression update applied successfully."
}
else {
    Write-Host "All required KB updates are already installed. No action required."
}

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Affected OS & Apps

Windows Server 2016

Microsoft

Windows 10

Microsoft

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