0vercl0k/cve-2021-32537PoC para CVE-2021-32537: um acesso de memória fora dos limites que leva à corrupção de pool no kernel do Windows.
Este é um bug que reportei à Realtek no início de abril de 2021. O driver afetado chama-se RTKVHD64.sys e parece estar disponível em vários hardwares convencionais (testei as configurações de hardware abaixo, mas provavelmente mais são vulneráveis):
Fui informado pela Realtek de que a vulnerabilidade foi corrigida e que a correção é distribuída pelo Windows Update, o que não consegui verificar por conta própria. Esta é a documentação divulgada pela Taiwan Computer Emergency Response Team: TVN-202106002 / CVE-2021-32537.
Os binários estão disponíveis na seção de releases.
Durante a inicialização, o driver aloca estruturas no pool do kernel. Em InitDeviceExtension chamado por StartDevice (parâmetro de PcAddAdapterDevice):
devext->unk->events = ExAllocatePoolWithTag(pooltype, 0x5F0ui64, 'mEvt');
struct EVT {
PKSPIN_LOCK lock;
PVOID event;
UINT64 someflag;
} /* sizeof == 0x18 */
struct MEVT {
struct EVT array[63];
UINT64 flags;
} /* sizeof == 0x18*63 + 8 == 0x5f0 */
O array EVT tem um tamanho fixo de 63 elementos. Ao enviar o IOCTL 0x225f04 para o driver, o primeiro DWORD da entrada é usado como índice do array sem qualquer sanitização:
input_index = *(_DWORD *)IrpSystemBuffer;
v5 = Crash(
mevts,
stack->FileObject,
unk,
&mevts->array[input_index].event,
(KSPIN_LOCK *)&mevts->array[input_index]);
Crash chama KeAcquireSpinLockRaiseToDpc usando o ponteiro KSPIN_LOCK &mevts->array[input_index] que está fora dos limites.
Isso leva ao seguinte BSoD ao definir input_index como 0xaaaaaaaa:
5: kd> !analyze -v
*******************************************************************************
* *
* Bugcheck Analysis *
* *
*******************************************************************************
IRQL_NOT_LESS_OR_EQUAL (a)
An attempt was made to access a pageable (or completely invalid) address at an
interrupt request level (IRQL) that is too high. This is usually
caused by drivers using improper addresses.
If a kernel debugger is available get the stack backtrace.
Arguments:
Arg1: ffffac983ca17910, memory referenced
Arg2: 0000000000000002, IRQL
Arg3: 0000000000000001, bitfield :
bit 0 : value 0 = read operation, 1 = write operation
bit 3 : value 0 = not an execute operation, 1 = execute operation (only on chips which support this level of status)
Arg4: fffff8065d8e4793, address which referenced memory
TRAP_FRAME: ffffd60852d52d30 -- (.trap 0xffffd60852d52d30)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=0000000000000000 rbx=0000000000000000 rcx=0000000000000000
rdx=ffffac885763cbc0 rsi=0000000000000000 rdi=0000000000000000
rip=fffff8065d8e4793 rsp=ffffd60852d52ec0 rbp=ffffac883ca17920
r8=aaaaaaaaaaaaaaaa r9=ffffac983ca17918 r10=ffffac883ca17920
r11=aaaaaaaaaaaaaaaa r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0 nv up ei pl zr na po nc
nt!KeAcquireSpinLockRaiseToDpc+0x53:
fffff806`5d8e4793 f0480fba2b00 lock bts qword ptr [rbx],0 ds:00000000`00000000=????????????????
Resetting default scope
STACK_TEXT:
ffffd608`52d52be8 fffff806`5da07b69 : 00000000`0000000a ffffac98`3ca17910 00000000`00000002 00000000`00000001 : nt!KeBugCheckEx
ffffd608`52d52bf0 fffff806`5da03e69 : 00000000`00000002 ffffdf00`8a8c0180 00000000`00000003 fffff806`5d84b0b6 : nt!KiBugCheckDispatch+0x69
ffffd608`52d52d30 fffff806`5d8e4793 : ffffd608`52d52fb0 00000000`00000190 00000000`00000001 ffffac88`5763b770 : nt!KiPageFault+0x469
ffffd608`52d52ec0 fffff806`5b996dc1 : aaaaaaaa`aaaaaaaa ffffac88`4b86ba00 ffffd608`52d53440 00000000`00000040 : nt!KeAcquireSpinLockRaiseToDpc+0x53
ffffd608`52d52ef0 fffff806`5b996b1f : ffffac88`4b86ba00 00000000`00000000 ffffac88`52fe7d40 fffff806`5d867ce0 : RTKVHD64+0x16dc1
ffffd608`52d52f20 fffff806`5bb49455 : ffffac88`3ca17920 00000000`c0000002 00000000`00000001 fffff806`00000000 : RTKVHD64+0x16b1f
ffffd608`52d52fc0 fffff806`5bb6e6d0 : 00000000`c0000001 ffffac88`4b86bc38 ffffac88`3c9471a0 ffffac88`3c9471a0 : RTKVHD64+0x1c9455
ffffd608`52d53020 fffff806`5d852f55 : ffffac88`4b86ba00 ffffd608`52d53100 ffffac88`4b86bc80 ffffac88`3c276ce0 : RTKVHD64+0x1ee6d0
ffffd608`52d53070 fffff806`5bf416bf : ffffac88`4b86ba00 ffffd608`52d53100 ffffac88`4b86bc80 ffffac88`3c276ce0 : nt!IofCallDriver+0x55
ffffd608`52d530b0 fffff806`5bf41023 : ffffac88`4b86ba00 00000000`00000001 00000000`00000000 ffffac88`5763cbc0 : ksthunk!CKernelFilterDevice::DispatchIrp+0x23b
ffffd608`52d53110 fffff806`5d852f55 : 00000000`0000000e 00000000`00000000 ffffd608`20206f49 00000000`00000001 : ksthunk!CKernelFilterDevice::DispatchIrpBridge+0x13
ffffd608`52d53140 fffff806`5dbfd898 : ffffd608`52d534c0 ffffac88`4b86ba00 00000000`00000001 ffffac88`574de0c0 : nt!IofCallDriver+0x55
ffffd608`52d53180 fffff806`5dbfd165 : 00000000`00225f04 ffffd608`52d534c0 00000000`00000005 ffffd608`52d534c0 : nt!IopSynchronousServiceTail+0x1a8
ffffd608`52d53220 fffff806`5dbfcb66 : 00007ffe`eb9fda90 00000000`00000000 00000000`00000000 00000000`00000000 : nt!IopXxxControlFile+0x5e5
ffffd608`52d53360 fffff806`5da075b5 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!NtDeviceIoControlFile+0x56
ffffd608`52d533d0 00007ffe`edf2ccf4 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiSystemServiceCopyEnd+0x25
000000fd`e0eff8b8 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x00007ffe`edf2ccf4
5: kd> db ffffac983ca17910-(0xaaaaaaaa*0x18)
ffffac88`3ca17920 00 00 00 00 00 00 00 00-70 83 2e 38 88 ac ff ff ........p..8....
ffffac88`3ca17930 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
ffffac88`3ca17940 40 8c 8f 44 88 ac ff ff-00 00 00 00 00 00 00 00 @..D............
ffffac88`3ca17950 00 00 00 00 00 00 00 00-d0 83 2e 38 88 ac ff ff ...........8....
ffffac88`3ca17960 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
ffffac88`3ca17970 e0 85 2e 38 88 ac ff ff-00 00 00 00 00 00 00 00 ...8............
ffffac88`3ca17980 00 00 00 00 00 00 00 00-90 84 2e 38 88 ac ff ff ...........8....
ffffac88`3ca17990 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
5: kd> !pool ffffac88`3ca17920
Pool page ffffac883ca17920 region is Nonpaged pool
ffffac883ca17000 size: 900 previous size: 0 (Allocated) PFXM
*ffffac883ca17910 size: 600 previous size: 0 (Allocated) *tvEm
Owning component : Unknown (update pooltag.txt)
ffffac883ca17f10 size: d0 previous size: 0 (Free) 2.3.