BusyBox SMB Sharing - Metasploit


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

Table Of Contents
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Module Overview

Name: BusyBox SMB Sharing
Module: post/linux/busybox/smb_share_root
Source code: modules/post/linux/busybox/smb_share_root.rb
Disclosure date: -
Last modification time: 2017-07-24 06:26:21 +0000
Supported architecture(s): -
Supported platform(s): Linux
Target service / protocol: -
Target network port(s): -
List of CVEs: -

This module will be applied on a session connected to a BusyBox shell. It will modify the SMB configuration of the device executing BusyBox to share the root directory of the device.

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/linux/busybox/smb_share_root

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/linux/busybox/smb_share_root
msf post(smb_share_root) > show options
    ... show and set options ...
msf post(smb_share_root) > set SESSION session-id
msf post(smb_share_root) > 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/linux/busybox/smb_share_root")
  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 linux/busybox/smb_share_root post exploitation module looks in the msfconsole:

msf6 > use post/linux/busybox/smb_share_root

msf6 post(linux/busybox/smb_share_root) > show info

       Name: BusyBox SMB Sharing
     Module: post/linux/busybox/smb_share_root
   Platform: Linux
       Arch: 
       Rank: Normal

Provided by:
  Javier Vicente Vallejo

Compatible session types:
  Shell

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

Description:
  This module will be applied on a session connected to a BusyBox 
  shell. It will modify the SMB configuration of the device executing 
  BusyBox to share the root directory of the device.

Module Options

This is a complete list of options available in the linux/busybox/smb_share_root post exploitation module:

msf6 post(linux/busybox/smb_share_root) > show options

Module options (post/linux/busybox/smb_share_root):

   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 linux/busybox/smb_share_root post exploitation module:

msf6 post(linux/busybox/smb_share_root) > show advanced

Module advanced options (post/linux/busybox/smb_share_root):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   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 linux/busybox/smb_share_root module can do:

msf6 post(linux/busybox/smb_share_root) > show actions

Post actions:

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

Evasion Options

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

msf6 post(linux/busybox/smb_share_root) > 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.

Writable directory not found

Here is a relevant code snippet related to the "Writable directory not found" error message:

29:	      writable_directory = busy_box_writable_dir
30:	      if writable_directory
31:	        print_status('writable directory found, copying smb.conf and restarting smbd')
32:	        copy_smb_conf(writable_directory)
33:	      else
34:	        print_error('Writable directory not found')
35:	      end
36:	    else
37:	      print_error('smb.conf not found')
38:	    end
39:	  end

smb.conf not found

Here is a relevant code snippet related to the "smb.conf not found" error message:

32:	        copy_smb_conf(writable_directory)
33:	      else
34:	        print_error('Writable directory not found')
35:	      end
36:	    else
37:	      print_error('smb.conf not found')
38:	    end
39:	  end
40:	
41:	  def copy_smb_conf(dir)
42:	    cmd_exec_delay("rm -f #{dir}smb.conf")

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See Also

Check also the following modules related to this module:

Authors

Javier Vicente Vallejo

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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