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metasploit-framework
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metasploit-framework/lib/msf/core/exploit/smb.rb

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# -*- coding: binary -*-
require 'rex/proto/smb'
require 'rex/proto/ntlm'
require 'rex/proto/dcerpc'
require 'rex/encoder/ndr'
module Msf
require 'msf/core/exploit/smb_server'
###
#
# This mixin provides utility methods for interacting with a SMB/CIFS service on
# a remote machine. These methods may generally be useful in the context of
# exploitation. This mixin extends the Tcp exploit mixin. Only one SMB
# service can be accessed at a time using this class.
#
###
module Exploit::Remote::SMB
include Exploit::Remote::Tcp
include Exploit::Remote::NTLM::Client
SIMPLE = Rex::Proto::SMB::SimpleClient
XCEPT = Rex::Proto::SMB::Exceptions
CONST = Rex::Proto::SMB::Constants
# Alias over the Rex DCERPC protocol modules
DCERPCPacket = Rex::Proto::DCERPC::Packet
DCERPCClient = Rex::Proto::DCERPC::Client
DCERPCResponse = Rex::Proto::DCERPC::Response
DCERPCUUID = Rex::Proto::DCERPC::UUID
NDR = Rex::Encoder::NDR
def initialize(info = {})
super
register_evasion_options(
[
OptBool.new('SMB::pipe_evasion', [ true, 'Enable segmented read/writes for SMB Pipes', false]),
OptInt.new('SMB::pipe_write_min_size', [ true, 'Minimum buffer size for pipe writes', 1]),
OptInt.new('SMB::pipe_write_max_size', [ true, 'Maximum buffer size for pipe writes', 1024]),
OptInt.new('SMB::pipe_read_min_size', [ true, 'Minimum buffer size for pipe reads', 1]),
OptInt.new('SMB::pipe_read_max_size', [ true, 'Maximum buffer size for pipe reads', 1024]),
OptInt.new('SMB::pad_data_level', [ true, 'Place extra padding between headers and data (level 0-3)', 0]),
OptInt.new('SMB::pad_file_level', [ true, 'Obscure path names used in open/create (level 0-3)', 0]),
OptInt.new('SMB::obscure_trans_pipe_level', [ true, 'Obscure PIPE string in TransNamedPipe (level 0-3)', 0]),
], Msf::Exploit::Remote::SMB)
register_advanced_options(
[
OptBool.new('SMBDirect', [ true, 'The target port is a raw SMB service (not NetBIOS)', true ]),
OptString.new('SMBUser', [ false, 'The username to authenticate as', '']),
OptString.new('SMBPass', [ false, 'The password for the specified username', '']),
OptString.new('SMBDomain', [ false, 'The Windows domain to use for authentication', '.']),
OptString.new('SMBName', [ true, 'The NetBIOS hostname (required for port 139 connections)', '*SMBSERVER']),
OptBool.new('SMB::VerifySignature', [ true, "Enforces client-side verification of server response signatures", false]),
OptInt.new('SMB::ChunkSize', [ true, 'The chunk size for SMB segments, bigger values will increase speed but break NT 4.0 and SMB signing', 500]),
#
# Control the identified operating system of the client
#
OptString.new('SMB::Native_OS', [ true, 'The Native OS to send during authentication', 'Windows 2000 2195']),
OptString.new('SMB::Native_LM', [ true, 'The Native LM to send during authentication', 'Windows 2000 5.0']),
], Msf::Exploit::Remote::SMB)
register_options(
[
Opt::RHOST,
OptInt.new('RPORT', [ true, 'Set the SMB service port', 445])
], Msf::Exploit::Remote::SMB)
register_autofilter_ports([ 139, 445])
register_autofilter_services(%W{ netbios-ssn microsoft-ds })
end
# Override {Exploit::Remote::Tcp#connect} to setup an SMB connection
# and configure evasion options
#
# Also populates {#simple}.
#
# @param (see Exploit::Remote::Tcp#connect)
# @return (see Exploit::Remote::Tcp#connect)
def connect(global=true)
disconnect() if global
s = super(global)
self.sock = s if global
# Disable direct SMB when SMBDirect has not been set
# and the destination port is configured as 139
direct = smb_direct
if(datastore.default?('SMBDirect') and rport.to_i == 139)
direct = false
end
c = SIMPLE.new(s, direct)
# setup pipe evasion foo
if datastore['SMB::pipe_evasion']
# XXX - insert code to change the instance of the read/write functions to do segmentation
end
if (datastore['SMB::pad_data_level'])
c.client.evasion_opts['pad_data'] = datastore['SMB::pad_data_level']
end
if (datastore['SMB::pad_file_level'])
c.client.evasion_opts['pad_file'] = datastore['SMB::pad_file_level']
end
if (datastore['SMB::obscure_trans_pipe_level'])
c.client.evasion_opts['obscure_trans_pipe'] = datastore['SMB::obscure_trans_pipe_level']
end
self.simple = c if global
c
end
# Convert a standard ASCII string to 16-bit Unicode
def unicode(str)
Rex::Text.to_unicode(str)
end
# Establishes an SMB session over the default socket and connects to
# the IPC$ share.
#
# You should call {#connect} before calling this
#
# @return [void]
def smb_login
simple.login(
datastore['SMBName'],
datastore['SMBUser'],
datastore['SMBPass'],
datastore['SMBDomain'],
datastore['SMB::VerifySignature'],
datastore['NTLM::UseNTLMv2'],
datastore['NTLM::UseNTLM2_session'],
datastore['NTLM::SendLM'],
datastore['NTLM::UseLMKey'],
datastore['NTLM::SendNTLM'],
datastore['SMB::Native_OS'],
datastore['SMB::Native_LM'],
{:use_spn => datastore['NTLM::SendSPN'], :name => self.rhost}
)
simple.connect("\\\\#{datastore['RHOST']}\\IPC$")
end
# This method returns the native operating system of the peer
def smb_peer_os
self.simple.client.peer_native_os
end
# This method returns the native lanman version of the peer
def smb_peer_lm
self.simple.client.peer_native_lm
end
# This method opens a handle to an IPC pipe
def smb_create(pipe)
self.simple.create_pipe(pipe)
end
#the default chunk size of 48000 for OpenFile is not compatible when signing is enabled (and with some nt4 implementations)
#cause it looks like MS windows refuse to sign big packet and send STATUS_ACCESS_DENIED
#fd.chunk_size = 500 is better
def smb_open(path, perm)
self.simple.open(path, perm, datastore['SMB::ChunkSize'])
end
def smb_hostname
datastore['SMBName'] || '*SMBSERVER'
end
def smb_direct
datastore['SMBDirect']
end
def domain
datastore['SMBDomain']
end
def smbhost
if domain == "."
"#{rhost}:#{rport}"
else
"#{rhost}:#{rport}|#{domain}"
end
end
# If the username contains a / slash, then
# split it as a domain/username. NOTE: this
# is predicated on forward slashes, and not
# Microsoft's backwards slash convention.
def domain_username_split(user)
return user if(user.nil? || user.empty?)
if !user[/\//] # Only /, not \!
return [nil,user]
else
return user.split("/",2)
end
end
def splitname(uname)
if datastore["PRESERVE_DOMAINS"]
d,u = domain_username_split(uname)
return u
else
return uname
end
end
# Whether a remote file exists
#
# @param file [String] Path to a file to remove, relative to the
# most-recently connected share
# @raise [Rex::Proto::SMB::Exceptions::ErrorCode]
def smb_file_exist?(file)
begin
fd = simple.open(file, 'ro')
rescue XCEPT::ErrorCode => e
# If attempting to open the file results in a "*_NOT_FOUND" error,
# then we can be sure the file is not there.
#
# Copy-pasted from smb/exceptions.rb to avoid the gymnastics
# required to pull them out of a giant inverted hash
#
# 0xC0000034 => "STATUS_OBJECT_NAME_NOT_FOUND",
# 0xC000003A => "STATUS_OBJECT_PATH_NOT_FOUND",
# 0xC0000225 => "STATUS_NOT_FOUND",
error_is_not_found = [ 0xC0000034, 0xC000003A, 0xC0000225 ].include?(e.error_code)
# If the server returns some other error, then there was a
# permissions problem or some other difficulty that we can't
# really account for and hope the caller can deal with it.
raise e unless error_is_not_found
found = !error_is_not_found
else
# There was no exception, so we know the file is openable
fd.close
found = true
end
found
end
# Remove remote file
#
# @param file (see #smb_file_exist?)
# @return [void]
def smb_file_rm(file)
fd = smb_open(file, 'ro')
fd.delete
end
#
# Fingerprinting methods
#
# Calls the EnumPrinters() function of the spooler service
def smb_enumprinters(flags, name, level, blen)
stub =
NDR.long(flags) +
(name ? NDR.uwstring(name) : NDR.long(0)) +
NDR.long(level) +
NDR.long(rand(0xffffffff)+1)+
NDR.long(blen) +
"\x00" * blen +
NDR.long(blen)
handle = dcerpc_handle(
'12345678-1234-abcd-ef00-0123456789ab', '1.0',
'ncacn_np', ["\\SPOOLSS"]
)
begin
dcerpc_bind(handle)
dcerpc.call(0x00, stub)
return dcerpc.last_response.stub_data
rescue ::Interrupt
raise $!
rescue ::Exception => e
return nil
end
end
# This method dumps the print provider strings from the spooler
def smb_enumprintproviders
resp = smb_enumprinters(8, nil, 1, 0)
return nil if not resp
rptr, tmp, blen = resp.unpack("V*")
resp = smb_enumprinters(8, nil, 1, blen)
return nil if not resp
bcnt,pcnt,stat = resp[-12, 12].unpack("VVV")
return nil if stat != 0
return nil if pcnt == 0
return nil if bcnt > blen
return nil if pcnt < 3
#
# The correct way, which leads to invalid offsets :-(
#
#providers = []
#
#0.upto(pcnt-1) do |i|
# flags,desc_o,name_o,comm_o = resp[8 + (i*16), 16].unpack("VVVV")
#
# #desc = read_unicode(resp,8+desc_o).gsub("\x00", '')
# #name = read_unicode(resp,8+name_o).gsub("\x00", '')
# #comm = read_unicode(resp,8+comm_o).gsub("\x00", '')
# #providers << [flags,desc,name,comm]
#end
#
#providers
return resp
end
# This method performs an extensive set of fingerprinting operations
def smb_fingerprint
fprint = {}
# Connect to the server if needed
if not self.simple
connect()
smb_login()
end
fprint['native_os'] = smb_peer_os()
fprint['native_lm'] = smb_peer_lm()
# Leverage Recog for SMB native OS fingerprinting
fp_match = Recog::Nizer.match('smb.native_os', fprint['native_os']) || { }
os = fp_match['os.product'] || 'Unknown'
sp = fp_match['os.version'] || ''
# Metasploit prefers 'Windows 2003' vs 'Windows Server 2003'
if os =~ /^Windows Server/
os = os.sub(/^Windows Server/, 'Windows')
end
if fp_match['os.edition']
fprint['edition'] = fp_match['os.edition']
end
if fp_match['os.build']
fprint['build'] = fp_match['os.build']
end
if sp == ''
sp = smb_fingerprint_windows_sp(os)
end
lang = smb_fingerprint_windows_lang
fprint['os'] = os
fprint['sp'] = sp
fprint['lang'] = lang
fprint
end
#
# Determine the service pack level of a Windows system via SMB probes
#
def smb_fingerprint_windows_sp(os)
sp = ''
if (os == 'Windows XP')
# SRVSVC was blocked in SP2
begin
smb_create("\\SRVSVC")
sp = 'Service Pack 0 / 1'
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
if (e.error_code == 0xc0000022)
sp = 'Service Pack 2+'
end
end
end
if (os == 'Windows 2000' and sp.length == 0)
# LLSRPC was blocked in a post-SP4 update
begin
smb_create("\\LLSRPC")
sp = 'Service Pack 0 - 4'
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
if (e.error_code == 0xc0000022)
sp = 'Service Pack 4 with MS05-010+'
end
end
end
#
# Perform granular XP SP checks if LSARPC is exposed
#
if (os == 'Windows XP')
#
# Service Pack 2 added a range(0,64000) to opnum 0x22 in SRVSVC
# Credit to spoonm for first use of unbounded [out] buffers
#
handle = dcerpc_handle(
'4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
'ncacn_np', ["\\BROWSER"]
)
begin
dcerpc_bind(handle)
stub =
NDR.uwstring(Rex::Text.rand_text_alpha(rand(10)+1)) +
NDR.wstring(Rex::Text.rand_text_alpha(rand(10)+1)) +
NDR.long(64001) +
NDR.long(0) +
NDR.long(0)
dcerpc.call(0x22, stub)
sp = "Service Pack 0 / 1"
rescue ::Interrupt
raise $!
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
rescue ::Rex::Proto::SMB::Exceptions::ReadPacket
rescue ::Rex::Proto::DCERPC::Exceptions::Fault
sp = "Service Pack 2+"
rescue ::Exception
end
#
# Service Pack 3 fixed information leaks via [unique][out] pointers
# Call SRVSVC::NetRemoteTOD() to return [out] [ref] [unique]
# Credit:
# Pointer leak is well known, but Immunity also covered in a paper
# Silent fix of pointer leak in SP3 and detection method by Rhys Kidd
#
handle = dcerpc_handle(
'4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
'ncacn_np', ["\\BROWSER"]
)
begin
dcerpc_bind(handle)
stub = NDR.uwstring(Rex::Text.rand_text_alpha(rand(8)+1))
resp = dcerpc.call(0x1c, stub)
if(resp and resp[0,4] == "\x00\x00\x02\x00")
sp = "Service Pack 3"
else
if(resp and sp =~ /Service Pack 2\+/)
sp = "Service Pack 2"
end
end
rescue ::Interrupt
raise $!
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
rescue ::Rex::Proto::SMB::Exceptions::ReadPacket
rescue ::Exception
end
end
sp
end
#
# Determine the native language pack of a Windows system via SMB probes
#
def smb_fingerprint_windows_lang
#
# Remote language detection via Print Providers
# Credit: http://immunityinc.com/downloads/Remote_Language_Detection_in_Immunity_CANVAS.odt
#
lang = 'Unknown'
sigs =
{
'English' =>
[
Rex::Text.to_unicode('Windows NT Remote Printers'),
Rex::Text.to_unicode('LanMan Print Services')
],
'Spanish' =>
[
Rex::Text.to_unicode('Impresoras remotas Windows NT'),
Rex::Text.to_unicode('Impresoras remotas de Windows NT')
],
'Italian' =>
[
Rex::Text.to_unicode('Stampanti remote di Windows NT'),
Rex::Text.to_unicode('Servizi di stampa LanMan')
],
'French' =>
[
Rex::Text.to_unicode('Imprimantes distantes NT'),
Rex::Text.to_unicode('Imprimantes distantes pour Windows NT'),
Rex::Text.to_unicode("Services d'impression LanMan")
],
'German' =>
[
Rex::Text.to_unicode('Remotedrucker')
],
'Portuguese - Brazilian' =>
[
Rex::Text.to_unicode('Impr. remotas Windows NT'),
Rex::Text.to_unicode('Impressoras remotas do Windows NT')
],
'Portuguese' =>
[
Rex::Text.to_unicode('Imp. remotas do Windows NT')
],
'Hungarian' =>
[
Rex::Text.to_unicode("\x54\xe1\x76\x6f\x6c\x69\x20\x6e\x79\x6f\x6d\x74\x61\x74\xf3\x6b")
],
'Finnish' =>
[
Rex::Text.to_unicode("\x45\x74\xe4\x74\x75\x6c\x6f\x73\x74\x69\x6d\x65\x74")
],
'Dutch' =>
[
Rex::Text.to_unicode('Externe printers voor NT')
],
'Danish' =>
[
Rex::Text.to_unicode('Fjernprintere')
],
'Swedish' =>
[
Rex::Text.to_unicode("\x46\x6a\xe4\x72\x72\x73\x6b\x72\x69\x76\x61\x72\x65")
],
'Polish' =>
[
Rex::Text.to_unicode('Zdalne drukarki')
],
'Czech' =>
[
Rex::Text.to_unicode("\x56\x7a\x64\xe1\x6c\x65\x6e\xe9\x20\x74\x69\x73\x6b\xe1\x72\x6e\x79")
],
'Turkish' =>
[
"\x59\x00\x61\x00\x7a\x00\x31\x01\x63\x00\x31\x01\x6c\x00\x61\x00\x72\x00"
],
'Japanese' =>
[
"\xea\x30\xe2\x30\xfc\x30\xc8\x30\x20\x00\xd7\x30\xea\x30\xf3\x30\xbf\x30"
],
'Chinese - Traditional' =>
[
"\xdc\x8f\x0b\x7a\x53\x62\x70\x53\x3a\x67"
],
'Chinese - Traditional / Taiwan' =>
[
"\x60\x90\xef\x7a\x70\x53\x68\x88\x5f\x6a",
],
'Korean' =>
[
"\xd0\xc6\xa9\xac\x20\x00\x04\xd5\xb0\xb9\x30\xd1",
],
'Russian' =>
[
"\x1f\x04\x40\x04\x38\x04\x3d\x04\x42\x04\x35\x04\x40\x04\x4b\x04\x20\x00\x43\x04\x34\x04\x30\x04\x3b\x04\x35\x04\x3d\x04\x3d\x04\x3e\x04\x33\x04\x3e\x04\x20\x00\x34\x04\x3e\x04\x41\x04\x42\x04\x43\x04\x3f\x04\x30\x04",
],
}
begin
prov = smb_enumprintproviders()
if(prov)
sigs.each_key do |k|
sigs[k].each do |s|
if(prov.index(s))
lang = k
break
end
break if lang != 'Unknown'
end
break if lang != 'Unknown'
end
if(lang == 'Unknown')
@fpcache ||= {}
mhash = ::Digest::MD5.hexdigest(prov[4,prov.length-4])
if(not @fpcache[mhash])
buff = "\n"
buff << "*** NEW FINGERPRINT: PLEASE SEND TO [ msfdev[at]metasploit.com ]\n"
buff << " VERS: $Revision$\n"
buff << " HOST: #{rhost}\n"
buff << " OS: #{os}\n"
buff << " SP: #{sp}\n"
prov.unpack("H*")[0].scan(/.{64}|.*/).each do |line|
next if line.length == 0
buff << " FP: #{line}\n"
end
prov.split(/\x00\x00+/n).each do |line|
line.gsub!("\x00",'')
line.strip!
next if line.length < 6
buff << " TXT: #{line}\n"
end
buff << "*** END FINGERPRINT\n"
print_line(buff)
@fpcache[mhash] = true
end
end
end
rescue ::Interrupt
raise $!
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
end
lang
end
# @return [Rex::Proto::SMB::SimpleClient]
attr_accessor :simple
end
end
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