Patch

CVE-2023-29325

with vRx

Vulnerability Overview

CVE Name

CVE-2023-29325

Severity

7.5

High

CVE Description

Windows OLE Remote Code Execution Vulnerability

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Latest Patch info

Patch Name

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29325

Date

09.05.2023

Script

Script Type

Remediation script

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The following PowerShell script is a remediation script for CVE-2023-29325, which is (RCE) in Outlook that can be exploited through specially crafted formats. The purpose of this script is to mitigate the CVE by configuring Outlook to open all email formats in plain text and this helps to prevent the exploitation of this CVE by disabling formatting (pictures, links, email messages)

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if (-not ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
    Write-Host "Please run this script as an administrator."
    Exit
}

$kbNumbers = @(
    "KB5026415",
    "KB5026409",
    "KB5026419",
    "KB5026411",
    "KB5026413",
    "KB5026426",
    "KB5026408",
    "KB5026427",
    "KB5026363",
    "KB5026382",
    "KB5026361",
    "KB5026368",
    "KB5026372",
    "KB5026370",
    "KB5026362"
)

$updatesMissing = @()

foreach ($kbNumber in $kbNumbers) {
    $update = Get-HotFix -Id $kbNumber -ErrorAction SilentlyContinue
    if (!$update) {
        $updatesMissing += $kbNumber
    }
}

if ($updatesMissing) {
    Write-Host "The required updates are missing. Performing mitigation steps..."

$outlookRegistryPaths = @(
        "HKCU:\software\policies\microsoft\office\16.0\outlook\security",
        "HKCU:\software\policies\microsoft\office\15.0\outlook\security",
        "HKCU:\software\policies\microsoft\office\14.0\outlook\security"
    )

$existingRegistryPath = $outlookRegistryPaths | Where-Object { Test-Path $_ } | Select-Object -First 1

if ($existingRegistryPath) {
        if (!(Test-Path $existingRegistryPath)) {
            New-Item -Path $existingRegistryPath -Force | Out-Null
        }

$keys = @{
            "msgformats" = 1
        }

$keys.GetEnumerator() | ForEach-Object {
            Set-ItemProperty -Path $existingRegistryPath -Name $_.Key -Value $_.Value
        }

Write-Host "Outlook registry path: $existingRegistryPath"
        Write-Host "Outlook has been configured to open all emails in plain text."
    } else {
        Write-Host "No valid Outlook version found. Unable to perform mitigation."
    }
} else {
    Write-Host "All necessary updates are already installed. No mitigation required."
}

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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 2016

Microsoft

Windows Server 2012

Microsoft

Windows Server 2008

Microsoft

Windows 11 21H2

Microsoft

Windows 10 20H2

Microsoft

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