Patch

CVE-2023-28217

with vRx

Vulnerability Overview

CVE Name

CVE-2023-28217

Severity

7.5

High

CVE Description

Windows Network Address Translation (NAT) Denial of Service 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://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28217

Date

12.04.2023

Script

Script Type

Remediation script

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Windows Network Address Translation (NAT) Denial of Service Vulnerability" This script will mitigate the CVE-2023-28217 according to the official mitigation instructions at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28217 by automating the mitigation instructions & process. More about CVE-2023-28217: https://nvd.nist.gov/vuln/detail/CVE-2023-28217

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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
}

# Block incoming traffic to the Windows Network Address Translation (NAT) Service
Write-Host "[+] Blocking incoming traffic to the Windows NAT Service..."

# Add firewall rule to block incoming traffic on port 49876
$ruleName = "Block NAT Service Vulnerability"
$ruleDescription = "Block incoming traffic to the Windows Network Address Translation (NAT) Service for CVE-2023-28217 vulnerability"

# Prompt user for port number or use default
$port = Read-Host "Enter the port number (default: 49876):"
if ([string]::IsNullOrEmpty($port)) {
    $port = 49876
}

$ruleAction = "Block"

try {
    New-NetFirewallRule -DisplayName $ruleName -Description $ruleDescription -Direction Inbound -LocalPort $port -Protocol TCP -Action $ruleAction -Enabled True | Out-Null
    Write-Host "[+] Firewall rule created successfully."
} catch {
    Write-Host "[-] Failed to create firewall rule: $_"
    exit
}

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

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Affected OS & Apps

Windows 11 22H2

Microsoft

Windows 10 22H2

Microsoft

Windows 10 21H2

Microsoft

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