MS14-025: Kerentanan dalam preferensi kebijakan grup dapat memungkinkan hak khusus: 13 April 2014

Perubahan penting

Tindakan: Buat atau mengganti

• Kolom nama pengguna, sandi, dan Konfirmasi sandi akan dinonaktifkan.

• Kotak dialog peringatan muncul ketika administrator terbuka atau mencoba untuk menyimpan perubahan pada pilihan yang ada yang berisi sandi.

Tindakan: pemutakhiran

• Kolom sandi dan Konfirmasi sandi akan dinonaktifkan.

• Kotak dialog peringatan muncul ketika administrator terbuka atau mencoba untuk menyimpan perubahan pada pilihan yang ada yang berisi sandi.

Tindakan: Hapus

• Tidak ada perubahan perilaku

Pemecahan masalah

Bagi mereka yang sebelumnya mengandalkan preferensi kebijakan grup untuk menetapkan kata sandi administrator lokal, skrip berikut ini tersedia sebagai alternatif CPassword yang aman. Salin dan menyimpan konten ke berkas Windows PowerShell baru, dan kemudian menjalankan skrip seperti yang ditunjukkan di belakangnya. CONTOH bagian.

Microsoft menyediakan contoh pemrogaman hanya untuk ilustrasi, tanpa garansi baik tersurat maupun tersirat. Ini mencakup, namun tidak terbatas pada, garansi yang tersirat dapat diperjualbelikan atau kesesuaian untuk tujuan tertentu. Artikel ini menganggap bahwa Anda sudah terbiasa dengan bahasa pemrograman yang ditunjukkan dan terbiasa dengan alat-alat yang digunakan untuk membuat dan prosedur debug. Teknisi dukungan Microsoft dapat membantu menjelaskan fungsionalitas prosedur tertentu. Namun, mereka tidak akan mengubah contoh tersebut untuk memberikan fungsionalitas tambahan atau menyusun prosedur untuk memenuhi persyaratan khusus Anda.

function Invoke-PasswordRoll
{
<#
.SYNOPSIS

This script can be used to set the local account passwords on remote machines to random passwords. The username/password/server combination will be saved in a CSV file.
The account passwords stored in the CSV file can be encrypted using a password of the administrators choosing to ensure clear-text account passwords aren't written to disk.
The encrypted passwords can be decrypted using another function in this file: ConvertTo-CleartextPassword


Function: Invoke-PasswordRoll
Author: Microsoft
Version: 1.0

.DESCRIPTION

This script can be used to set the local account passwords on remote machines to random passwords. The username/password/server combination will be saved in a CSV file.
The account passwords stored in the CSV file can be encrypted using a password of the administrators choosing to ensure clear-text account passwords aren't written to disk.
The encrypted passwords can be decrypted using another function in this file: ConvertTo-CleartextPassword

.PARAMETER ComputerName

An array of computers to run the script against using PowerShell remoting.

.PARAMETER LocalAccounts

An array of local accounts whose password should be changed.

.PARAMETER TsvFileName

The file to output the username/password/server combinations to.

.PARAMETER EncryptionKey

A password to encrypt the TSV file with. Uses AES encryption. Only the passwords stored in the TSV file will be encrypted, the username and servername will be clear-text.

.PARAMETER PasswordLength

The length of the passwords which will be randomly generated for local accounts.

.PARAMETER NoEncryption

Do not encrypt the account passwords stored in the TSV file. This will result in clear-text passwords being written to disk.

.EXAMPLE

. .\Invoke-PasswordRoll.ps1 #Loads the functions in this script file
Invoke-PasswordRoll -ComputerName (Get-Content computerlist.txt) -LocalAccounts @("administrator","CustomLocalAdmin") -TsvFileName "LocalAdminCredentials.tsv" -EncryptionKey "Password1"

Connects to all the computers stored in the file "computerlist.txt". If the local account "administrator" and/or "CustomLocalAdmin" are present on the system, their password is changed
to a randomly generated password of length 20 (the default). The username/password/server combinations are stored in LocalAdminCredentials.tsv, and the account passwords are AES encrypted using the password "Password1".

.EXAMPLE

. .\Invoke-PasswordRoll.ps1 #Loads the functions in this script file
Invoke-PasswordRoll -ComputerName (Get-Content computerlist.txt) -LocalAccounts @("administrator") -TsvFileName "LocalAdminCredentials.tsv" -NoEncryption -PasswordLength 40

Connects to all the computers stored in the file "computerlist.txt". If the local account "administrator" is present on the system, its password is changed to a random generated
password of length 40. The username/password/server combinations are stored in LocalAdminCredentials.tsv unencrypted.

.NOTES
Requirements:
-PowerShellv2 or above must be installed
-PowerShell remoting must be enabled on all systems the script will be run against

Script behavior:
-If a local account is present on the system, but not specified in the LocalAccounts parameter, the script will write a warning to the screen to alert you to the presence of this local account. The script will continue running when this happens.
-If a local account is specified in the LocalAccounts parameter, but the account does not exist on the computer, nothing will happen (an account will NOT be created).
-The function ConvertTo-CleartextPassword, contained in this file, can be used to decrypt passwords that are stored encrypted in the TSV file.
-If a server specified in ComputerName cannot be connected to, PowerShell will output an error message.
-Microsoft advises companies to regularly roll all local and domain account passwords.

#>
[CmdletBinding(DefaultParameterSetName="Encryption")]
Param(
[Parameter(Mandatory=$true)]
[String[]]
$ComputerName,

[Parameter(Mandatory=$true)]
[String[]]
$LocalAccounts,

[Parameter(Mandatory=$true)]
[String]
$TsvFileName,

[Parameter(ParameterSetName="Encryption", Mandatory=$true)]
[String]
$EncryptionKey,

[Parameter()]
[ValidateRange(20,120)]
[Int]
$PasswordLength = 20,

[Parameter(ParameterSetName="NoEncryption", Mandatory=$true)]
[Switch]
$NoEncryption
)


#Load any needed .net classes
Add-Type -AssemblyName "System.Web" -ErrorAction Stop


#This is the scriptblock that will be executed on every computer specified in ComputerName
$RemoteRollScript = {
Param(
[Parameter(Mandatory=$true, Position=1)]
[String[]]
$Passwords,

[Parameter(Mandatory=$true, Position=2)]
[String[]]
$LocalAccounts,

#This is here so I can record what the server name that the script connected to was, sometimes the DNS records get messed up, it can be nice to have this.
[Parameter(Mandatory=$true, Position=3)]
[String]
$TargettedServerName
)

$LocalUsers = Get-WmiObject Win32_UserAccount -Filter "LocalAccount=true" | Foreach {$_.Name}

#Check if the computer has any local user accounts whose passwords are not going to be rolled by this script
foreach ($User in $LocalUsers)
{
if ($LocalAccounts -inotcontains $User)
{
Write-Warning "Server: '$($TargettedServerName)' has a local account '$($User)' whos password is NOT being changed by this script"
}
}

#For every local account specified that exists on this server, change the password
$PasswordIndex = 0
foreach ($LocalAdmin in $LocalAccounts)
{
$Password = $Passwords[$PasswordIndex]

if ($LocalUsers -icontains $LocalAdmin)
{
try
{
$objUser = [ADSI]"WinNT://localhost/$($LocalAdmin), user"
$objUser.psbase.Invoke("SetPassword", $Password)

$Properties = @{
TargettedServerName = $TargettedServerName
Username = $LocalAdmin
Password = $Password
RealServerName = $env:computername
}

$ReturnData = New-Object PSObject -Property $Properties
Write-Output $ReturnData
}
catch
{
Write-Error "Error changing password for user:$($LocalAdmin) on server:$($TargettedServerName)"
}
}

$PasswordIndex++
}
}


#Generate the password on the client running this script, not on the remote machine. System.Web.Security isn't available in the .NET Client profile. Making this call
# on the client running the script ensures only 1 computer needs the full .NET runtime installed (as opposed to every system having the password rolled).
function Create-RandomPassword
{
Param(
[Parameter(Mandatory=$true)]
[ValidateRange(20,120)]
[Int]
$PasswordLength
)

$Password = [System.Web.Security.Membership]::GeneratePassword($PasswordLength, $PasswordLength / 4)

#This should never fail, but I'm putting a sanity check here anyways
if ($Password.Length -ne $PasswordLength)
{
throw new Exception("Password returned by GeneratePassword is not the same length as required. Required length: $($PasswordLength). Generated length: $($Password.Length)")
}

return $Password
}


#Main functionality - Generate a password and remote in to machines to change the password of local accounts specified
if ($PsCmdlet.ParameterSetName -ieq "Encryption")
{
try
{
$Sha256 = new-object System.Security.Cryptography.SHA256CryptoServiceProvider
$SecureStringKey = $Sha256.ComputeHash([System.Text.UnicodeEncoding]::Unicode.GetBytes($EncryptionKey))
}
catch
{
Write-Error "Error creating TSV encryption key" -ErrorAction Stop
}
}

foreach ($Computer in $ComputerName)
{
#Need to generate 1 password for each account that could be changed
$Passwords = @()
for ($i = 0; $i -lt $LocalAccounts.Length; $i++)
{
$Passwords += Create-RandomPassword -PasswordLength $PasswordLength
}

Write-Output "Connecting to server '$($Computer)' to roll specified local admin passwords"
$Result = Invoke-Command -ScriptBlock $RemoteRollScript -ArgumentList @($Passwords, $LocalAccounts, $Computer) -ComputerName $Computer
#If encryption is being used, encrypt the password with the user supplied key prior to writing to disk
if ($Result -ne $null)
{
if ($PsCmdlet.ParameterSetName -ieq "NoEncryption")
{
$Result | Select-Object Username,Password,TargettedServerName,RealServerName | Export-Csv -Append -Path $TsvFileName -NoTypeInformation
}
else
{
#Filters out $null entries returned
$Result = $Result | Select-Object Username,Password,TargettedServerName,RealServerName

foreach ($Record in $Result)
{
$PasswordSecureString = ConvertTo-SecureString -AsPlainText -Force -String ($Record.Password)
$Record | Add-Member -MemberType NoteProperty -Name EncryptedPassword -Value (ConvertFrom-SecureString -Key $SecureStringKey -SecureString $PasswordSecureString)
$Record.PSObject.Properties.Remove("Password")
$Record | Select-Object Username,EncryptedPassword,TargettedServerName,RealServerName | Export-Csv -Append -Path $TsvFileName -NoTypeInformation
}
}
}
}
}


function ConvertTo-CleartextPassword
{
<#
.SYNOPSIS
This function can be used to decrypt passwords that were stored encrypted by the function Invoke-PasswordRoll.

Function: ConvertTo-CleartextPassword
Author: Microsoft
Version: 1.0

.DESCRIPTION
This function can be used to decrypt passwords that were stored encrypted by the function Invoke-PasswordRoll.


.PARAMETER EncryptedPassword

The encrypted password that was stored in a TSV file.

.PARAMETER EncryptionKey

The password used to do the encryption.


.EXAMPLE

. .\Invoke-PasswordRoll.ps1 #Loads the functions in this script file
ConvertTo-CleartextPassword -EncryptionKey "Password1" -EncryptedPassword 76492d1116743f0423413b16050a5345MgB8AGcAZgBaAHUAaQBwADAAQgB2AGgAcABNADMASwBaAFoAQQBzADEAeABjAEEAPQA9AHwAZgBiAGYAMAA1ADYANgA2ADEANwBkADQAZgAwADMANABjAGUAZQAxAGIAMABiADkANgBiADkAMAA4ADcANwBhADMAYQA3AGYAOABkADcAMQA5ADQAMwBmAGYANQBhADEAYQBjADcANABkADIANgBhADUANwBlADgAMAAyADQANgA1ADIAOQA0AGMAZQA0ADEAMwAzADcANQAyADUANAAzADYAMAA1AGEANgAzADEAMQA5ADAAYwBmADQAZAA2AGQA"

Decrypts the encrypted password which was stored in the TSV file.

#>
Param(
[Parameter(Mandatory=$true)]
[String]
$EncryptedPassword,

[Parameter(Mandatory=$true)]
[String]
$EncryptionKey
)

$Sha256 = new-object System.Security.Cryptography.SHA256CryptoServiceProvider
$SecureStringKey = $Sha256.ComputeHash([System.Text.UnicodeEncoding]::Unicode.GetBytes($EncryptionKey))

[SecureString]$SecureStringPassword = ConvertTo-SecureString -String $EncryptedPassword -Key $SecureStringKey
Write-Output ([System.Runtime.InteropServices.Marshal]::PtrToStringAuto([System.Runtime.InteropServices.Marshal]::SecureStringToCoTaskMemUnicode($SecureStringPassword)))
}

Administrator dapat menambahkan akun administrator lokal ke komputer dengan membuat grup Active Directory dan menambahkannya ke grup administrator lokal melalui kebijakan grup Preferensi -> grup lokal. Tindakan ini tidak cache kredensial. Kotak dialog menyerupai berikut ini. Pemecahan masalah ini memerlukan sambungan ke Layanan Domain direktori aktif saat pengguna logon menggunakan kredensial tersebut.

Perubahan penting

Tindakan: Membuat, pemutakhiran, atau mengganti

• Kolom nama pengguna, sandidan konfirmasi sandi akan dinonaktifkan.

Tindakan: Hapus

• Tidak ada perubahan perilaku

Pemecahan masalah

Alih-alih menggunakan sandi metode otentikasi, Anda dapat menggunakan Windows Explorer untuk mengelola izin berbagi dan mengalokasikan hak pengguna. Anda dapat menggunakan objek direktori aktif ke control izin ke folder.

Perubahan penting

Mulai: Tidak ada perubahan, otomatis atau Manual

• Bidang sandi dan konfirmasi sandi akan dinonaktifkan.

• Administrator dapat menggunakan hanya akun internal.

Mulai: menonaktifkan

• Tidak ada perubahan perilaku

Kotak dialog yang baru

• Administrator yang mencoba menggunakan non-dibangun-in pengguna untuk akun ini"menerima peringatan berikut:

Pemecahan masalah

Layanan masih dapat menjalankan sebagai akun sistem lokal. Izin Layanan dapat diubah seperti yang didokumentasikan di artikel berikut ini di Pangkalan Pengetahuan Microsoft:

256345 cara mengkonfigurasi kebijakan grup pengaturan untuk mengatur keamanan untuk layanan sistem

Catatan Jika layanan yang Anda ingin mengkonfigurasi tidak ada, Anda harus mengkonfigurasi pengaturan pada komputer yang memiliki layanan yang berjalan.

Perubahan penting

Tindakan: Membuat, pemutakhiran, atau mengganti

• Apabila Anda memilih opsi Jalankan Apakah pengguna masuk atau tidak , kotak dialog tidak meminta kredensial administrator.

• Kotak centang tidak menyimpan sandi dinonaktifkan. Secara default, kotak juga diperiksa.

Tindakan: Hapus

Tidak ada perubahan perilaku

Pemecahan masalah

Untuk "tugas terjadwal (setidaknya Windows 7)" dan "segera tugas (setidaknya Windows 7)" tugas, administrator dapat menggunakan akun pengguna khusus saat logon pengguna tertentu. Atau, mereka hanya dapat memiliki akses ke sumber daya lokal sebagai pengguna. Tugas ini masih dapat berjalan dalam konteks Layanan lokal.

Perubahan penting

Tindakan: Membuat, pemutakhiran, atau mengganti

• Kotak centang Jalankan sebagai dinonaktifkan. Oleh karena itu, Nama pengguna, sandi, dan Confirm Password bidang semua dinonaktifkan.

Tindakan: Hapus

Tidak ada perubahan perilaku

Pemecahan masalah

"Tugas terjadwal" dan "Segera tugas (Windows XP)" item, jadwal tugas berjalan dengan menggunakan izin yang saat ini tersedia untuk layanan lokal.

Perubahan penting

Tindakan: Membuat, pemutakhiran, atau mengganti

• Nama pengguna, sandi, dan Confirm Password bidang dinonaktifkan:

Tindakan: Hapus

• Tidak ada perubahan perilaku

Pemecahan masalah

Tidak ada penyelesaian tersedia. Preferensi ini tidak lagi menyimpan kredensial untuk mengizinkan akses ke sumber data yang dilindungi dengan sandi.

Mendeteksi CPassword preferensi

Skrip ini harus dijalankan dari direktori lokal pada kontroler domain yang ingin Anda Bersihkan. Salin dan menyimpan konten ke berkas Windows PowerShell baru, menentukan kandar sistem, dan kemudian menjalankan skrip seperti yang ditunjukkan dalam penggunaan berikut ini.

<#.SYNOPSIS
Group Policy objects in your domain can have preferences that store passwords for different tasks, such as the following:
1. Data Sources
2. Drive Maps
3. Local Users
4. Scheduled Tasks (both XP and up-level)
5. Services
These passwords are stored in SYSVOL as part of GP preferences and are not secure because of weak encryption (32-byte AES).
Therefore, we recommend that you not deploy such preferences in your domain environment and remove any such existing
preferences. This script is to help administrator find GP Preferences in their domain's SYSVOL that contains passwords.

.DESCRIPTION
This script should be run on a DC or a client computer that is installed with RSAT to print all the preferences that contain
password with information such as GPO, Preference Name, GPEdit path under which this preference is defined.
After you have a list of affected preferences, these preferences can be removed by using the editor in the Group Policy Management Console.

.SYNTAX
Get-SettingsWithCPassword.ps1 [-Path <String>]
.EXAMPLE
Get-SettingsWithCPassword.ps1 -Path %WinDir%\SYSVOL\domain
Get-SettingsWithCPassword.ps1 -Path <GPO Backup Folder Path>

.NOTES
If Group Policy PS module is not found the output will contain GPO GUIDs instead of GPO names. You can either run
this script on a domain controller or rerun the script on the client after you have installed RSAT and
enabled the Group Policy module.
Or, you can use GPO GUIDs to obtain GPO names by using the Get-GPO cmdlet.

.LINK
http://go.microsoft.com/fwlink/?LinkID=390507

#>
#----------------------------------------------------------------------------------------------------------------
# Input parameters
#--------------------------------------------------------------------------------------------------------------
param(
[string]$Path = $(throw "-Path is required.") # Directory path where GPPs are located.
)
#---------------------------------------------------------------------------------------------------------------
$isGPModuleAvailable = $false
$impactedPrefs = { "Groups.xml", "ScheduledTasks.xml","Services.xml", "DataSources.xml", "Drives.xml" }
#----------------------------------------------------------------------------------------------------------------
# import Group olicy module if available
#----------------------------------------------------------------------------------------------------------------
if (-not (Get-Module -name "GroupPolicy"))
{
if (Get-Module -ListAvailable |
Where-Object { $_.Name -ieq "GroupPolicy" })
{
$isGPModuleAvailable = $true
Import-Module "GroupPolicy"
}
else
{
Write-Warning "Unable to import Group Policy module for PowerShell. Therefore, GPO guids will be reported.
Run this script on DC to obtain the GPO names, or use the Get-GPO cmdlet (on DC) to obtain the GPO name from GPO guid."
}
}
else
{
$isGPModuleAvailable = $true
}
Function Enum-SettingsWithCpassword ( [string]$sysvolLocation )
{
# GPMC tree paths
$commonPath = " -> Preferences -> Control Panel Settings -> "
$driveMapPath = " -> Preferences -> Windows Settings -> "

# Recursively obtain all the xml files within the SYVOL location
$impactedXmls = Get-ChildItem $sysvolLocation -Recurse -Filter "*.xml" | Where-Object { $impactedPrefs -cmatch $_.Name }


# Each xml file contains multiple preferences. Iterate through each preference to check whether it
# contains cpassword attribute and display it.
foreach ( $file in $impactedXmls )
{
$fileFullPath = $file.FullName

# Set GPP category. If file is located under Machine folder in SYSVOL
# the setting is defined under computer configuration otherwise the
# setting is a to user configuration
if ( $fileFullPath.Contains("Machine") )
{
$category = "Computer Configuration"
}
elseif ( $fileFullPath.Contains("User") )
{
$category = "User Configuration"
}
else
{
$category = "Unknown"
}
# Obtain file content as XML
try
{
[xml]$xmlFile = get-content $fileFullPath -ErrorAction Continue
}
catch [Exception]{
Write-Host $_.Exception.Message
}
if ($xmlFile -eq $null)
{
continue
}
switch ( $file.BaseName )
{
Groups
{
$gppWithCpassword = $xmlFile.SelectNodes("Groups/User") | where-Object { [String]::IsNullOrEmpty($_.Properties.cpassword) -eq $false }
$preferenceType = "Local Users"
}
ScheduledTasks
{
$gppWithCpassword = $xmlFile.SelectNodes("ScheduledTasks/*") | where-Object { [String]::IsNullOrEmpty($_.Properties.cpassword) -eq $false }
$preferenceType = "Scheduled Tasks"
}
DataSources
{
$gppWithCpassword = $xmlFile.SelectNodes("DataSources/DataSource") | where-Object { [String]::IsNullOrEmpty($_.Properties.cpassword) -eq $false }
$preferenceType = "Data sources"
}
Drives
{
$gppWithCpassword = $xmlFile.SelectNodes("Drives/Drive") | where-Object { [String]::IsNullOrEmpty($_.Properties.cpassword) -eq $false }
$preferenceType = "Drive Maps"
}
Services
{
$gppWithCpassword = $xmlFile.SelectNodes("NTServices/NTService") | where-Object { [String]::IsNullOrEmpty($_.Properties.cpassword) -eq $false }
$preferenceType = "Services"
}
default
{ # clear gppWithCpassword and preferenceType for next item.
try
{
Clear-Variable -Name gppWithCpassword -ErrorAction SilentlyContinue
Clear-Variable -Name preferenceType -ErrorAction SilentlyContinue
}
catch [Exception]{}
}
}
if ($gppWithCpassword -ne $null)
{
# Build GPO name from GUID extracted from filePath
$guidRegex = [regex]"\{(.*)\}"
$match = $guidRegex.match($fileFullPath)
if ($match.Success)
{
$gpoGuid = $match.groups[1].value
$gpoName = $gpoGuid
}
else
{
$gpoName = "Unknown"
}
if($isGPModuleAvailable -eq $true)
{
try
{
$gpoInfo = Get-GPO -Guid $gpoGuid -ErrorAction Continue
$gpoName = $gpoInfo.DisplayName
}
catch [Exception] {
Write-Host $_.Exception.Message
}
}
# display prefrences that contain cpassword
foreach ( $gpp in $gppWithCpassword )
{
if ( $preferenceType -eq "Drive Maps" )
{
$prefLocation = $category + $driveMapPath + $preferenceType
}
else
{
$prefLocation = $category + $commonPath + $preferenceType
}
$obj = New-Object -typeName PSObject
$obj | Add-Member –membertype NoteProperty –name GPOName –value ($gpoName) –passthru |
Add-Member -MemberType NoteProperty -name Preference -value ($gpp.Name) -passthru |
Add-Member -MemberType NoteProperty -name Path -value ($prefLocation)
Write-Output $obj
}
} # end if $gppWithCpassword
} # end foreach $file
} # end functions Enum-PoliciesWithCpassword
#-----------------------------------------------------------------------------------
# Check whether Path is valid. Enumerate all settings that contain cpassword.
#-----------------------------------------------------------------------------------
if (Test-Path $Path )
{
Enum-SettingsWithCpassword $Path
}
else
{
Write-Warning "No such directory: $Path"
}



Contoh penggunaan (menganggap bahwa sistem drive C)

.\Get-SettingsWithCPassword.ps1 –path “C:\Windows\SYSVOL\domain” | Format-List
Catatan Perhatikan bahwa Anda juga dapat menargetkan GPO setiap cadangan untuk jalur dan bukan domain.

Skrip deteksi menghasilkan daftar yang menyerupai berikut ini:



Untuk daftar lagi, pertimbangkan untuk menyimpan hasil ke file:

.\Get-SettingsWithCPassword.ps1 –path “C:\Windows\SYSVOL\domain” | ConvertTo-Html > gpps.html

Menghapus preferensi CPassword

Untuk menghapus preferensi yang berisi CPassword data, kami menyarankan agar Anda menggunakan konsol manajemen kebijakan grup (GPMC) pada kontroler domain atau dari klien yang memiliki alat administrasi Server jauh diinstal. Anda dapat menghapus preferensi apa pun dalam lima langkah pada konsol ini. Untuk melakukannya, ikuti langkah-langkah berikut:

1. Di GPMC, buka preferensi yang berisi CPassword data.

2. Mengubah tindakan untuk menghapus atau menonaktifkan, sebagai dapat diterapkan untuk preferensi.

3. Klik OK untuk menyimpan perubahan.

4. Tunggu sampai satu atau dua siklus penyegaran kebijakan grup untuk mengizinkan perubahan dialihkan ke klien.

5. Setelah perubahan yang diterapkan pada semua klien, Hapus preferensi.

6. Ulangi langkah 1 sampai 5 yang diperlukan untuk membersihkan seluruh lingkungan. Apabila skrip deteksi mengembalikan hasil nol, Anda telah selesai.