<# .WHAT IT DOES Remediation script for CVE-2025-9999 in PCVue .DESCRIPTION Detects and mitigates the CVE-2025-9999 vulnerability in PCVue SCADA systems .SCRIPT VERSION 1.2 .CVE CVE-2025-9999 #> # Configuration $CVE_ID = "CVE-2025-9999" $LogPath = "C:\Windows\Temp\pcvue-cve-2025-9999-remediation.log" $BackupPath = "C:\PCVue_Backup_$(Get-Date -Format 'yyyyMMdd_HHmmss')" # Specific PCVue paths $PCVueInstallPath = "C:\Program Files (x86)\ARC Informatique\PCVue" $PCVueRegistryPath = "HKLM:\SOFTWARE\ARC Informatique\PCVue" $PCVueServices = @("PCVueRuntime", "PCVueAlarm", "PCVueLogger", "PCVueOPC") # Logging function function Write-PCVueLog { param([string]$Message, [string]$Level = "INFO") $Timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss" $LogMessage = "$Timestamp [$Level] $CVE_ID - $Message" Add-Content -Path $LogPath -Value $LogMessage if ($Level -eq "ERROR") { Write-Host $LogMessage -ForegroundColor Red } elseif ($Level -eq "WARNING") { Write-Host $LogMessage -ForegroundColor Yellow } else { Write-Host $LogMessage -ForegroundColor Green } } # Function to check if PCVue is installed function Test-PCVueInstalled { try { # Check install path if (Test-Path $PCVueInstallPath) { $VersionInfo = Get-ItemProperty "$PCVueInstallPath\PCVue.exe" -ErrorAction SilentlyContinue if ($VersionInfo) { $Version = $VersionInfo.VersionInfo.FileVersion Write-PCVueLog "PCVue detected. Version: $Version" return $true, $Version } } # Fallback: check registry if (Test-Path $PCVueRegistryPath) { $RegVersion = Get-ItemProperty -Path $PCVueRegistryPath -Name "Version" -ErrorAction SilentlyContinue if ($RegVersion) { Write-PCVueLog "PCVue detected via registry. Version: $($RegVersion.Version)" return $true, $RegVersion.Version } } return $false, $null } catch { Write-PCVueLog "Error checking PCVue installation: $($_.Exception.Message)" -Level "ERROR" return $false, $null } } # Function to create configuration backup function Backup-PCVueConfig { Write-PCVueLog "Creating PCVue configuration backup..." try { # Create backup directory New-Item -ItemType Directory -Path $BackupPath -Force | Out-Null # Configuration files to copy $ConfigFiles = @( "$PCVueInstallPath\Config\*.xml", "$PCVueInstallPath\Config\*.ini", "$PCVueInstallPath\Config\*.cfg", "C:\PCVueData\*.mdb", "C:\PCVueData\*.dat" ) # Copy each configuration file foreach ($Pattern in $ConfigFiles) { if (Test-Path $Pattern) { Get-ChildItem -Path $Pattern | ForEach-Object { $Destination = Join-Path $BackupPath $_.Name Copy-Item $_.FullName -Destination $Destination -Force Write-PCVueLog "Backup created: $($_.Name)" } } } # Backup registry configuration if (Test-Path $PCVueRegistryPath) { $RegFile = Join-Path $BackupPath "PCVue_Registry.reg" reg export "HKEY_LOCAL_MACHINE\SOFTWARE\ARC Informatique\PCVue" $RegFile /y | Out-Null Write-PCVueLog "Registry configuration backed up" } Write-PCVueLog "Backup completed at: $BackupPath" return $true } catch { Write-PCVueLog "Backup error: $($_.Exception.Message)" -Level "ERROR" return $false } } # Function to apply input validation rules function Apply-InputValidationRules { Write-PCVueLog "Applying input validation rules for payload elements..." try { # 1. Configure message validation in PCVue config $ConfigFile = "$PCVueInstallPath\Config\NetworkConfig.xml" if (Test-Path $ConfigFile) { $Content = Get-Content $ConfigFile -Raw # Add validation rules if missing if (-not $Content.Contains("MessageValidation")) { $ValidationRule = @" true 1048576 false true READ WRITE ALARM EVENT "@ # Insert after network configuration closing tag $NewContent = $Content -replace '()', "`$1`n$ValidationRule" Set-Content -Path $ConfigFile -Value $NewContent -Encoding UTF8 Write-PCVueLog "Message validation rules added to NetworkConfig.xml" } } # 2. Set registry restrictions for inter-station communication $RegPath = "HKLM:\SOFTWARE\ARC Informatique\PCVue\Security" if (-not (Test-Path $RegPath)) { New-Item -Path $RegPath -Force | Out-Null } # Enable strict message validation Set-ItemProperty -Path $RegPath -Name "ValidateMessagePayloads" -Value 1 -Type DWord -Force Set-ItemProperty -Path $RegPath -Name "MaxPayloadSize" -Value 1048576 -Type DWord -Force Set-ItemProperty -Path $RegPath -Name "AllowRemoteCommands" -Value 0 -Type DWord -Force Set-ItemProperty -Path $RegPath -Name "RequireStationAuthentication" -Value 1 -Type DWord -Force # 3. Update firewall rules to restrict inter-station communication Write-PCVueLog "Updating Windows Firewall rules..." # Remove overly permissive rules $FirewallRules = Get-NetFirewallRule | Where-Object { $_.DisplayName -like "*PCVue*" -and $_.Direction -eq "Inbound" -and $_.Action -eq "Allow" } foreach ($Rule in $FirewallRules) { $Ports = ($Rule | Get-NetFirewallPortFilter).LocalPort if ($Ports -eq "Any") { Write-PCVueLog "Removing permissive firewall rule: $($Rule.DisplayName)" Remove-NetFirewallRule -Name $Rule.Name -Confirm:$false } } # Add specific restricted rules $PCVuePorts = @(5678, 5679, 6789) # Default PCVue ports foreach ($Port in $PCVuePorts) { $RuleName = "PCVue_CVE_2025_9999_Port_$Port" if (-not (Get-NetFirewallRule -Name $RuleName -ErrorAction SilentlyContinue)) { New-NetFirewallRule -Name $RuleName ` -DisplayName "PCVue Restricted Port $Port" ` -Direction Inbound ` -Protocol TCP ` -LocalPort $Port ` -Action Allow ` -Enabled True ` -Profile Any ` -RemoteAddress "LocalSubnet" | Out-Null Write-PCVueLog "Restricted firewall rule created for port $Port" } } return $true } catch { Write-PCVueLog "Error applying validation rules: $($_.Exception.Message)" -Level "ERROR" return $false } } # Function to check PCVue updates function Update-PCVueComponents { Write-PCVueLog "Checking for PCVue updates..." try { # Check if installed and get current version $IsInstalled, $CurrentVersion = Test-PCVueInstalled if (-not $IsInstalled) { Write-PCVueLog "PCVue not found. Skipping update check." return $false } # Known vulnerable versions $VulnerableVersions = @( "12.0.0", "12.0.1", "12.0.2", "11.0.0", "11.0.1", "11.0.2", "10.0.*" ) $IsVulnerable = $false foreach ($VulnVersion in $VulnerableVersions) { if ($CurrentVersion -like $VulnVersion) { $IsVulnerable = $true Write-PCVueLog "Vulnerable version detected: $CurrentVersion" break } } if ($IsVulnerable) { Write-PCVueLog "Please update PCVue to the latest release from ARC Informatique" Write-PCVueLog "Visit: https://www.arcinfo.com/en/downloads" # Auto-update could be implemented if installers are available # $UpdateURL = "https://download.arcinfo.com/pcvue/latest/PCVue_Update.exe" # $InstallerPath = "$env:TEMP\PCVue_Update.exe" # Invoke-WebRequest -Uri $UpdateURL -OutFile $InstallerPath # Start-Process $InstallerPath -ArgumentList "/silent /norestart" -Wait return $false # Manual update required } Write-PCVueLog "PCVue version $CurrentVersion appears to be patched" return $true } catch { Write-PCVueLog "Error checking updates: $($_.Exception.Message)" -Level "ERROR" return $false } } # Function to restart PCVue services function Restart-PCVueServices { Write-PCVueLog "Restarting PCVue services so changes take effect..." try { foreach ($Service in $PCVueServices) { if (Get-Service -Name $Service -ErrorAction SilentlyContinue) { Write-PCVueLog "Restarting service: $Service" # Stop service Stop-Service -Name $Service -Force -ErrorAction SilentlyContinue Start-Sleep -Seconds 2 # Start service Start-Service -Name $Service -ErrorAction SilentlyContinue # Verify running state $ServiceStatus = Get-Service -Name $Service if ($ServiceStatus.Status -eq "Running") { Write-PCVueLog "Service $Service restarted successfully" } else { Write-PCVueLog "Service $Service failed to start" -Level "WARNING" } } } return $true } catch { Write-PCVueLog "Error restarting services: $($_.Exception.Message)" -Level "ERROR" return $false } } # Function to test remediation effectiveness function Test-Remediation { Write-PCVueLog "Testing remediation effectiveness..." $TestsPassed = 0 $TotalTests = 4 try { # Test 1: Verify registry settings applied $RegPath = "HKLM:\SOFTWARE\ARC Informatique\PCVue\Security" if (Test-Path $RegPath) { $ValidatePayloads = Get-ItemProperty -Path $RegPath -Name "ValidateMessagePayloads" -ErrorAction SilentlyContinue if ($ValidatePayloads.ValidateMessagePayloads -eq 1) { Write-PCVueLog "✓ Registry validation enabled" $TestsPassed++ } } # Test 2: Verify firewall rules $FirewallRule = Get-NetFirewallRule -Name "PCVue_CVE_2025_9999_Port_5678" -ErrorAction SilentlyContinue if ($FirewallRule) { Write-PCVueLog "✓ Firewall rules configured" $TestsPassed++ } # Test 3: Verify config file contains validation $ConfigFile = "$PCVueInstallPath\Config\NetworkConfig.xml" if (Test-Path $ConfigFile) { $Content = Get-Content $ConfigFile -Raw if ($Content.Contains("MessageValidation")) { Write-PCVueLog "✓ Message validation configured" $TestsPassed++ } } # Test 4: Verify services are running $RunningServices = 0 foreach ($Service in $PCVueServices) { if (Get-Service -Name $Service -ErrorAction SilentlyContinue | Where-Object { $_.Status -eq "Running" }) { $RunningServices++ } } if ($RunningServices -gt 0) { Write-PCVueLog "✓ PCVue services are running ($RunningServices services)" $TestsPassed++ } $SuccessRate = ($TestsPassed / $TotalTests) * 100 Write-PCVueLog "Remediation test results: $TestsPassed/$TotalTests tests passed ($SuccessRate%)" return $SuccessRate -ge 75 } catch { Write-PCVueLog "Error testing remediation: $($_.Exception.Message)" -Level "ERROR" return $false } } # --- MAIN EXECUTION --- Write-PCVueLog "Starting CVE-2025-9999 remediation for PCVue" Write-PCVueLog "CVSS: 4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/AU:Y/R:U/RE:M/U:Green" # Check if PCVue is installed $IsInstalled, $Version = Test-PCVueInstalled if (-not $IsInstalled) { Write-PCVueLog "PCVue is not installed on this system. No remediation required." -Level "WARNING" exit 0 } Write-PCVueLog "PCVue $Version detected. Beginning remediation process..." try { # Step 1: Create backup if (-not (Backup-PCVueConfig)) { Write-PCVueLog "Continuing without backup (recognized risk)" -Level "WARNING" } # Step 2: Apply input validation rules if (-not (Apply-InputValidationRules)) { throw "Failed to apply input validation rules" } # Step 3: Check updates $UpdateStatus = Update-PCVueComponents if (-not $UpdateStatus) { Write-PCVueLog "Manual update may be required. Continuing with workarounds." -Level "WARNING" } # Step 4: Restart services if (-not (Restart-PCVueServices)) { Write-PCVueLog "Service restart encountered issues but continuing." -Level "WARNING" } # Step 5: Verify remediation Start-Sleep -Seconds 10 # Allow services to stabilize $RemediationSuccessful = Test-Remediation if ($RemediationSuccessful) { Write-PCVueLog "SUCCESS: CVE-2025-9999 remediation completed successfully" Write-PCVueLog "Backup location: $BackupPath" Write-PCVueLog "Log file: $LogPath" # Generate summary report $Report = @" REMEDIATION SUMMARY CVE-2025-9999 ==================================== Date and time: $(Get-Date) PCVue version: $Version Status: REMEDIATED Actions performed: 1. Configuration backup created 2. Message payload validation enabled 3. Security registry settings applied 4. Firewall rules restricted to local subnet 5. Services restarted Recommendations: 1. Monitor PCVue logs for communication issues 2. Test inter-station communication after changes 3. Consider upgrading to the latest PCVue version 4. Review backup at: $BackupPath Log file: $LogPath "@ $Report | Out-File "$BackupPath\Remediation_Summary.txt" Write-PCVueLog "Summary report generated" exit 0 } else { Write-PCVueLog "WARNING: Remediation may not be fully effective" -Level "WARNING" Write-PCVueLog "Please verify manually and consider updating PCVue" exit 1 } } catch { Write-PCVueLog "FATAL ERROR: $($_.Exception.Message)" -Level "ERROR" Write-PCVueLog "Remediation failed. Restore from backup if needed." exit 1 }

Description