Patch

CVE-2022-21907

with vRx

Vulnerability Overview

CVE Name

CVE-2022-21907

Severity

9.8

Critical

CVE Description

HTTP Protocol Stack 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-2022-21907

Date

11.01.2022

Script

Script Type

Remediation script

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this remediation script checks for the Windows version and if was affected by CVE-2022-21907 the script Delete the registry key EnableTrailerSupport which enables specific parameters in the Windows HTTP protocol to mitigate it

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

if (-not $isAdmin) {
    Write-Host "Please run the script as an administrator."
    Exit
}

$kbNumbers = @("5009557", "5009543", "5009566", "5009555")

foreach ($kbNumber in $kbNumbers) {
    $kbInstalled = Get-HotFix | Where-Object {$_.HotFixID -eq $kbNumber}

if ($kbInstalled) {
        Write-Host "KB $kbNumber is already installed. No further action required."
    } else {
        Write-Host "KB $kbNumber is not installed. Mitigation may be required."

$winVersion = [System.Environment]::OSVersion.Version

$winServer2019Version = [System.Version]::new(10, 0, 17763)
        $win10v1809Version = [System.Version]::new(10, 0, 17763)

if ($winVersion -ge $winServer2019Version -and $winVersion -lt $win10v1809Version) {

$registryPath = "HKLM:\System\CurrentControlSet\Services\HTTP\Parameters"
            $registryValue = "EnableTrailerSupport"

if (Test-Path -Path $registryPath) {
                if (Test-Path -Path "$registryPath\$registryValue") {
                    Remove-ItemProperty -Path $registryPath -Name $registryValue -Force

Write-Host "Mitigation applied: Deleted the '$registryValue' registry value for KB $kbNumber."
                } else {
                    Write-Host "Mitigation not required: Registry value '$registryValue' does not exist for KB $kbNumber."
                }
            } else {
                Write-Host "Mitigation not required: Registry path '$registryPath' does not exist for KB $kbNumber."
            }
        }
        else {
            Write-Host "Mitigation not applicable for this Windows version for KB $kbNumber."
        }
    }
}

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Affected OS & Apps

Windows Server 2019

Microsoft

Windows 11

Microsoft

Windows 10

Microsoft

4.8

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