winrar upgrade script

Update-Winrar.ps1

<#
.DESCRIPTION Detects if WinRar is installed and upgrades to 7.13 if needed. Written to address CVE-2025-8088.
#>

function Update-Winrar
{
    if (-not (Test-Path -Path "$TempDir"))
    {
        New-Item -Path "$TempDir" -PathType Directory
    }

    try
    {
        Invoke-WebRequest -Uri "https://www.rarlab.com/rar/winrar-x64-713.exe" -UseBasicParsing -OutFile "$WinrarInstallerPath"
        Start-Process -FilePath "$WinrarInstallerPath" -Wait -ArgumentList "/S"
    } catch
    {
        Write-Error "Error updating WinRAR. $_"
    }
}

$appName = "WinRar"
$TempDir = "C:\Temp"
$WinrarInstallerPath = "$TempDir\winrar-x64-7.13.0.exe"
$NativeRegPath = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*'
$Wow6432RegPath = 'HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*'

# Get the list of installed programs including WOW64 if present
$UninstKeys = Get-ItemProperty $NativeRegPath
if (Test-Path $Wow6432RegPath -PathType Container)
{
    $UninstKeys += Get-ItemProperty $Wow6432RegPath
}

# Array to save PSCustomObjects into
$UninstallCustom = @()
foreach ($key in $UninstKeys)
{
    # Only process entries that have a DisplayName
    if ($key.DisplayName)
    {
        $UninstallCustom += [PSCustomObject]@{
            AppName = $key.DisplayName
            Version = if ($key.DisplayVersion)
            { $key.DisplayVersion 
            } else
            { "Unknown" 
            }
        }
    }
}

# Filter for WinRAR specifically
$WinRARInstalls = $UninstallCustom | Where-Object { $_.AppName -like "*WinRAR*" }


if ($WinRARInstalls)
{
    $needsUpdate = $false
    foreach ($install in $WinRARInstalls)
    {
        Write-Host "Found WinRAR: $($install.AppName) - Version: $($install.Version)"
        
        # Convert to version object for proper comparison
        try
        {
            $currentVersion = [System.Version]$install.Version
            $targetVersion = [System.Version]"7.13.0"

            if ($currentVersion -lt $targetVersion)
            {
                $needsUpdate = $true
                Write-Host "Version $($install.Version) is older than 7.13.0"
            }
        } catch
        {
            # Handle cases where version string can't be parsed
            Write-Host "Could not parse version: $($install.Version)"
            $needsUpdate = $true  # Assume update needed if we can't parse
        }
    }
    
    if ($needsUpdate)
    {
        Write-Host "Updating Winrar...."
        Update-Winrar
        Write-Host "WinRAR updated successfully!"
    } else
    {
        Write-Host "Already up to date."
    }
} else
{
    Write-Host "WinRAR not found. Nothing to do."
}