Patch

CVE-2023-24943

with vRx

Vulnerability Overview

CVE Name

CVE-2023-24943

Severity

9.8

Critical

CVE Description

Windows Pragmatic General Multicast (PGM) Remote Code Execution Vulnerability

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Latest Patch info

Patch Name

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24943

Date

09.05.2023

Script

Script Type

Remediation script

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Windows Pragmatic General Multicast (PGM) Remote Code Execution Vulnerability" This script will mitigate the CVE-2023-24943 according to the official mitigation instructions at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24943 by automating the mitigation instructions & process. More about CVE-2023-24943: https://nvd.nist.gov/vuln/detail/CVE-2023-24943

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# Check if the script is running as administrator
if (-not ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
    Write-Host "[-] Script must be run as administrator."
    exit
}

# Disable the Windows Message Queuing service
Write-Host "[+] Disabling Windows Message Queuing service..."
Set-Service -Name MSMQ -StartupType Disabled
Stop-Service -Name MSMQ

# Block TCP port 1801 using Windows Firewall
Write-Host "[+] Blocking TCP port 1801 using Windows Firewall..."
$ruleName = "Block TCP Port 1801"
$ruleDescription = "Block inbound and outbound TCP traffic on port 1801"
$ruleDirection = "Inbound,Outbound"
$ruleAction = "Block"
$ruleProtocol = "TCP"
$ruleLocalPort = 1801

$fw = New-Object -ComObject hnetcfg.fwpolicy2
$profile = $fw.get_CurrentProfile().Types | Where-Object { $_ -eq 1 -or $_ -eq 2 }
$fwRules = $fw.Rules

$existingRule = $fwRules | Where-Object {
    $_.Name -eq $ruleName -and
    $_.ApplicationName -eq $null -and
    $_.ServiceName -eq $null -and
    $_.LocalPorts -eq $ruleLocalPort -and
    $_.Protocol -eq $ruleProtocol
}

if ($existingRule) {
    Write-Host "[+] Firewall rule already exists. Skipping..."
}
else {
    $newRule = New-Object -ComObject HNetCfg.FWRule
    $newRule.Name = $ruleName
    $newRule.Description = $ruleDescription
    $newRule.Direction = $ruleDirection
    $newRule.Action = $ruleAction
    $newRule.Enabled = $true
    $newRule.Protocol = $ruleProtocol
    $newRule.LocalPorts = $ruleLocalPort
    $newRule.Profiles = $profile

$fwRules.Add($newRule)
    Write-Host "[+] Firewall rule created successfully."
}

Write-Host "[+] Mitigation completed successfully."

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Affected OS & Apps

Windows 11 22H2

Microsoft

Windows 10 22H2

Microsoft

Windows 10 21H2

Microsoft

Windows 11 22H2

Microsoft

Windows 10 22H2

Microsoft

Windows 10 21H2

Microsoft

Windows 10 1607

Microsoft

Windows 10 1507

Microsoft

Windows 10 1809

Microsoft

Windows Server 2022

Microsoft

Windows Server 2019

Microsoft

Windows Server 2016

Microsoft

Windows Server 2012

Microsoft

Windows Server 2008

Microsoft

Windows 11 21H2

Microsoft

Windows 10 20H2

Microsoft

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