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在安装2025年四月累积更新补丁KB5055523后，系统C盘根目录下会出现了一个名为“inetpub”的空文件夹。
“inetpub”文件夹通常与IIS相关，用于在Windows 11上托管网站或应用程序，但在此次更新中，即使用户未启用IIS，该文件夹也会自动创建。
对此微软确认，这个文件夹是4月补丁的一部分，与CVE-2025-21204权限提升安全漏洞的修复有关。
对于已经删除“inetpub”文件夹的用户，微软官方提供了两种恢复方案，一种是启用IIS服务，但这会创建额外的文件夹，对非开发者用户并不友好。
另一种是使用最新发布的PowerShell脚本，无需启用IIS即可重建文件夹，即通过管理员权限运行。
Set-InetpubFolderAcl.ps1
<#PSScriptInfo
.VERSION 1.0
.GUID 4278ab56-74de-4856-8a83-84ba4b546db1
.AUTHOR Microsoft
.COMPANYNAME Microsoft
.COPYRIGHT
.TAGS IIS Inetpub
.LICENSEURI
.PROJECTURI
.ICONURI
.EXTERNALMODULEDEPENDENCIES
.REQUIREDSCRIPTS
.EXTERNALSCRIPTDEPENDENCIES
.RELEASENOTES
Version 1.0: Original published version
#>
<#
.SYNOPSIS
Set security permissions on the directory inetpub.
.DESCRIPTION
This script sets the security permissions on the directory inetpub. The script is designed to be run as an administrator.
If inetpub directory does not exist, it gets created and default IIS permissions are applied to the directory.
If an empty inetpub directory exists, the default IIS permissions are applied to the directory.
If inetpub directory exists and only contains the sub-directory DeviceHealthAttestation, default IIS permissions are applied to both directories.
If inetpub directory exists and contains any other sub-directories, the script exits without making any changes.
.PARAMETER WhatIf
Preview changes the script will make without making the changes.
.EXAMPLE
.\Set-InetpubFolderAcl.ps1 -whatif
.EXAMPLE
.\Set-InetpubFolderAcl.ps1
#>
[CmdletBinding(SupportsShouldProcess=$true)]
Param()
function script:Test-HasUserData
{
if (-not (Test-Path -Path $inetpubPath))
{
return $False
}
$subFolders = Get-ChildItem -Path $inetpubPath | ? { $_.PSIsContainer -and !($_.Attributes -match "ReparsePoint") }
#
# win7: gci returns an object instead of collection if the directory contains only 1 sub-directory.
# Count property is null in this case since the return value is not a collection.
#
if ($null -ne $subfolders -and $null -eq $subfolders.Count -and $subfolders.Name -ne $dhaFolder)
{
return $True
}
#
# Check if inetpub directory has any sub-directories in it other than DeviceHealthAttestation.
#
if ($subFolders.Count -gt 1 -or ($subFolders.Count -eq 1 -and $subFolders[0].Name -ne $dhaFolder))
{
return $True
}
return $False
}
function script:Set-FolderAcl
{
param (
[Parameter(Mandatory=$true)]
[String] $folderPath,
[Parameter(Mandatory=$true)]
[String] $sddl,
[Parameter(Mandatory=$false)]
[switch] $Quiet
)
if (Test-Path $folderPath)
{
$folder = Get-Item $folderPath -ErrorAction SilentlyContinue;
if (($folder.Attributes -band [System.IO.FileAttributes]::ReparsePoint) -ne 0)
{
Write-Output "${folderPath} is a reparse point and will be ignored."
return
}
}
else
{
Write-Output "${folderPath} not found."
return
}
# Print current ACLs
if (-not $Quiet)
{
Write-Output "Current ACL on ${folderPath}:"
Get-Acl $folderPath | format-list
}
# Create the ACL object using the SDDL string
($acl = New-Object -TypeName System.Security.AccessControl.DirectorySecurity).SetSecurityDescriptorSddlForm($sddl)
try
{
Set-Acl -Path $folderPath -AclObject $acl -errorAction stop
}
catch
{
#
# win7: Set-ACL fails for ACLs with SYSTEM as owner. Replace SYSTEM with BA as the owner and retry
#
if ($_.Exception -is [System.InvalidOperationException])
{
Write-Output "Set-Acl failed with invalid operation exception. Retrying with built-in administrator as owner."
$sddlNew = $sddl -replace 'O:.+G:.+(D:.*)', 'O:BAG:BA$1'
($acl = New-Object -TypeName System.Security.AccessControl.DirectorySecurity).SetSecurityDescriptorSddlForm($sddlNew)
Set-Acl -Path $folderPath -AclObject $acl -ErrorAction Continue
}
else
{
Write-Output $_.Exception
}
}
# Print new ACLs
if (-not $Quiet)
{
Write-Output "New ACL on ${folderPath}:"
Get-Acl $folderPath | format-list
}
}
function script:Set-InetpubAcl
{
[CmdletBinding(SupportsShouldProcess = $true)]
param ()
# Set ACLs on the inetpub directory
if ($PSCmdlet.ShouldProcess($inetpubPath, "Set default IIS security permissions"))
{
Set-FolderAcl -folderPath $inetpubPath -sddl $sddlInetpub -Quiet
}
# Set ACLs on DeviceHealthAttestation and DeviceHealthAttestation/bin sub-directories
if (Test-Path -Path $dhaPath)
{
if ($PSCmdlet.ShouldProcess($dhaPath, "Set default IIS security permissions"))
{
Set-FolderAcl -folderPath $dhaPath -sddl $sddlInetpub
}
}
if (Test-Path -Path $dhabinPath)
{
if ($PSCmdlet.ShouldProcess($dhabinPath, "Set default IIS security permissions"))
{
Set-FolderAcl -folderPath $dhabinPath -sddl $sddlInetpub
}
}
}
#------------------------
# Main
#------------------------
# Ensure script is running as administrator
$IsAdmin = ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]"Administrator")
if (-not $IsAdmin)
{
Write-Output "The script needs admin rights to run and needs to be launched from an elevated command prompt."
Exit
}
$systemDrive = $env:SystemDrive
$inetpubFldr = "inetpub"
$inetpubPath = Join-Path -Path $systemDrive\ -ChildPath $inetpubFldr
$dhaFolder = "DeviceHealthAttestation"
$dhaPath = Join-Path -Path $inetpubPath\ -ChildPath $dhaFolder
$dhabinPath = Join-Path -Path $dhaPath\ -ChildPath 'bin'
$sddlInetpub = "O:SYG:SYD:P(A;CIOI;GA;;;S-1-5-80-956008885-3418522649-1831038044-1853292631-2271478464)(A;CIOI;GA;;;SY)(A;CIOI;GA;;;BA)(A;CIOI;GRGX;;;BU)(A;CIOI;GA;;;CO)"
if (Test-Path -Path $inetpubPath)
{
$folder = Get-Item -Path $inetpubPath
if (($folder.Attributes -band [System.IO.FileAttributes]::ReparsePoint) -ne 0)
{
Write-Output "This script does not support the inetpub directory that is a reparse point."
Exit
}
if (Test-HasUserData $inetpubPath)
{
Write-Output "The inetpub directory is not empty. No action will be taken."
Exit
}
$oldInetpubAcl = Get-Acl $inetpubPath
}
else
{
if ($PSCmdlet.ShouldProcess($inetpubPath, "Create directory"))
{
New-Item -Path $systemDrive\ -Name $inetpubFldr -Type "Directory" -ErrorAction Stop | Out-Null
}
}
Set-InetpubAcl
# Print ACLs on inetpub
if (-not $WhatIfPreference)
{
if ($null -ne $oldInetpubAcl)
{
Write-Output "Current security permissions on ${inetpubPath}:"
$oldInetpubAcl | format-list
}
if (Test-Path -Path $inetpubPath)
{
Write-Output "New security permissions on ${inetpubPath}:"
Get-Acl $inetpubPath | format-list
}
}
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# SIG # End signature block微软表示：“对于已安装KB5055528但删除了%systemroot%\inetpub目录的系统，需要立即进行修复。如果删除了inetpub目录，你需要运行修复脚本Set-InetpubFolderAcl.ps1”。
这个脚本的主要作用包括：如果已删除，将重新创建inetpub目录；确保目录权限正确配置，以防止未经授权的访问和与CVE-2025-21204相关的潜在漏洞；如果存在，更新DeviceHealthAttestation目录的ACL。
复制上面代码，在桌面新建文本文档，另存为Set-InetpubFolderAcl.ps1，然后右键“使用 PowerShell 运行”。
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