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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
###
#
# 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
# Mini-mixin for making SMBUser/SMBPass/SMBDomain regular options vs advanced
# Included when the module needs credentials to function
module Authenticated
def initialize(info = {})
super
register_options(
[
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', 'WORKGROUP']),
], Msf::Exploit::Remote::SMB::Authenticated)
end
end
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
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
# This method establishes a SMB session over the default socket
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
#
# Fingerprinting methods
#
# This method 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
os = 'Unknown'
sp = ''
case smb_peer_os()
when 'Windows NT 4.0'
os = 'Windows NT 4.0'
when 'Windows 5.0'
os = 'Windows 2000'
when 'Windows 5.1'
os = 'Windows XP'
when /Windows XP (\d+) Service Pack (\d+)/
os = 'Windows XP'
sp = 'Service Pack ' + $2
when /Windows Server 2003 (\d+)$/
os = 'Windows 2003'
sp = 'No Service Pack'
when /Windows Server 2003 (\d+) Service Pack (\d+)/
os = 'Windows 2003'
sp = 'Service Pack ' + $2
when /Windows Server 2003 R2 (\d+) Service Pack (\d+)/
os = 'Windows 2003 R2'
sp = 'Service Pack ' + $2
when /Windows Vista \(TM\) (\w+|\w+ \w+) (\d+) Service Pack (\d+)/
os = 'Windows Vista ' + $1
sp = 'Service Pack ' + $3
when /Windows Vista \(TM\) (\w+|\w+ \w+) (\d+)/
os = 'Windows Vista ' + $1
sp = '(Build ' + $2 + ')'
when /Windows Server \(R\) 2008 (([\-\w]+ ){1,4})(\d+) Service Pack (\d+)/
os = 'Windows 2008 ' + $1.strip
sp = 'Service Pack ' + $4
when /Windows Server \(R\) 2008 (([\-\w]+ ){1,4})(\d+)/
os = 'Windows 2008 ' + $1.strip
sp = '(Build ' + $3 + ')'
when /Windows \(R\) Storage Server 2008 (([\-\w]+ ){1,4})(\d+) Service Pack (\d+)/
os = 'Windows 2008 Storage Server ' + $1.strip
sp = 'Service Pack ' + $4
when /Windows \(R\) Storage Server 2008 (([\-\w]+ ){1,4})(\d+)/
os = 'Windows 2008 Storage Server ' + $1.strip
sp = '(Build ' + $3 + ')'
when /Windows 7 (([\-\w]+ ){1,4})(\d+)/
os = 'Windows 7 ' + $1.strip
sp = '(Build ' + $3 + ')'
when /^(Windows.*) Service Pack (\d+)/
os = $1.strip
sp = 'Service Pack ' + $2
when /^(Windows.*) (\d+)/
os = $1.strip
sp = '(Build ' + $2 + ')'
when 'VxWorks'
os = 'VxWorks'
sp = smb_peer_lm()
when 'Unix'
os = 'Unix'
sv = smb_peer_lm()
case sv
when /Samba\s+(.*)/i
sp = 'Samba ' + $1
end
end
if (os == 'Windows XP' and sp.length == 0)
# 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
#
# 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+/).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 $!
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
end
fprint['os'] = os
fprint['sp'] = sp
fprint['lang'] = lang
fprint
end
#
# Accessors
#
attr_accessor :simple
end
###
#
# This mixin provides a minimal SMB server
#
###
module Exploit::Remote::SMBServer
include Exploit::Remote::TcpServer
include Exploit::NTLM
CONST = ::Rex::Proto::SMB::Constants
CRYPT = ::Rex::Proto::SMB::Crypt
UTILS = ::Rex::Proto::SMB::Utils
XCEPT = ::Rex::Proto::SMB::Exceptions
EVADE = ::Rex::Proto::SMB::Evasions
def initialize(info = {})
super
register_options(
[
OptPort.new('SRVPORT', [ true, "The local port to listen on.", 445 ])
], self.class)
end
def setup
super
@state = {}
end
def on_client_connect(client)
# print_status("New SMB connection from #{client.peerhost}:#{client.peerport}")
smb_conn(client)
end
def on_client_data(client)
# print_status("New data from #{client.peerhost}:#{client.peerport}")
smb_recv(client)
true
end
def on_client_close(client)
smb_stop(client)
end
def smb_conn(c)
@state[c] = {:name => "#{c.peerhost}:#{c.peerport}", :ip => c.peerhost, :port => c.peerport}
end
def smb_stop(c)
@state.delete(c)
end
def smb_recv(c)
smb = @state[c]
smb[:data] ||= ''
smb[:data] << c.get_once
while(smb[:data].length > 0)
return if smb[:data].length < 4
plen = smb[:data][2,2].unpack('n')[0]
return if smb[:data].length < plen+4
buff = smb[:data].slice!(0, plen+4)
pkt_nbs = CONST::NBRAW_PKT.make_struct
pkt_nbs.from_s(buff)
# print_status("NetBIOS request from #{smb[:name]} #{pkt_nbs.v['Type']} #{pkt_nbs.v['Flags']} #{buff.inspect}")
# Check for a NetBIOS name request
if (pkt_nbs.v['Type'] == 0x81)
# Accept any name they happen to send
host_dst = UTILS.nbname_decode(pkt_nbs.v['Payload'][1,32]).gsub(/[\x00\x20]+$/, '')
host_src = UTILS.nbname_decode(pkt_nbs.v['Payload'][35,32]).gsub(/[\x00\x20]+$/, '')
smb[:nbdst] = host_dst
smb[:nbsrc] = host_src
# print_status("NetBIOS session request from #{smb[:name]} (asking for #{host_dst} from #{host_src})")
c.write("\x82\x00\x00\x00")
next
end
#
# TODO: Support AndX parameters
#
# Cast this to a generic SMB structure
pkt = CONST::SMB_BASE_PKT.make_struct
pkt.from_s(buff)
# Only response to requests, ignore server replies
if (pkt['Payload']['SMB'].v['Flags1'] & 128 != 0)
print_status("Ignoring server response from #{smb[:name]}")
next
end
cmd = pkt['Payload']['SMB'].v['Command']
begin
smb_cmd_dispatch(cmd, c, buff)
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_status("Error processing request from #{smb[:name]} (#{cmd}): #{e.class} #{e} #{e.backtrace}")
next
end
end
end
def smb_cmd_dispatch(cmd, c, buff)
smb = @state[c]
print_status("Received command #{cmd} from #{smb[:name]}")
end
def smb_set_defaults(c, pkt)
smb = @state[c]
pkt['Payload']['SMB'].v['ProcessID'] = smb[:process_id].to_i
pkt['Payload']['SMB'].v['UserID'] = smb[:user_id].to_i
pkt['Payload']['SMB'].v['TreeID'] = smb[:tree_id].to_i
pkt['Payload']['SMB'].v['MultiplexID'] = smb[:multiplex_id].to_i
end
def smb_error(cmd, c, errorclass, esn = false)
# 0xc0000022 = Deny
# 0xc000006D = Logon_Failure
# 0x00000000 = Ignore
pkt = CONST::SMB_BASE_PKT.make_struct
smb_set_defaults(c, pkt)
pkt['Payload']['SMB'].v['Command'] = cmd
pkt['Payload']['SMB'].v['Flags1'] = 0x88
if esn
pkt['Payload']['SMB'].v['Flags2'] = 0xc801
else
pkt['Payload']['SMB'].v['Flags2'] = 0xc001
end
pkt['Payload']['SMB'].v['ErrorClass'] = errorclass
c.put(pkt.to_s)
end
end
end
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